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Accession number:20211410180809
Title:Recent advances in structured illumination microscopy????(Open Access)
Authors:Ma, Ying (1); Wen, Kai (1); Liu, Min (1); Zheng, Juanjuan (1); Chu, Kaiqin (2); Smith, Zachary J. (2); Liu, Lixin (1); Gao, Peng (1)
Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei; 230026, China
Corresponding author:Gao, Peng(peng.gao@xidian.edu.cnemailkqchu@ustc.edu.cn)Chu, Kaiqin(kqchu@ustc.edu.cn)
Source title:JPhys Photonics
Abbreviated source title:JPhys photonics
Volume:3
Issue:2
Issue date:April 2021
Publication year:2021
Article number:024009
Language:English
E-ISSN:25157647
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

Structured illumination microscopy (SIM), is a wide-field, minimally-invasive super-resolution optical imaging approach with optical sectioning capability, and it has been extensively applied to many different fields. During the past decades, SIM has been drawing great attention for both the technique development and applications. In this review, firstly, the basic conception, instrumentation, and functionalities of SIM are introduced concisely. Secondly, recent advances in SIM which enhance SIM in different aspects are reviewed. Finally, the variants of SIM are summarized and the outlooks and perspectives of SIM are presented.
© 2021 The Author(s).
Number of references:96
Uncontrolled terms:Minimally invasive - Optical imaging - Optical sectioning - Structured illumination microscopies (SIM) - Structured illumination microscopy - Super resolution - Technique development - Wide field
DOI:10.1088/2515-7647/abdb04
Funding details: Number: -, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;Number: 2017M610623, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: 2020JM-193, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2020JQ-324, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 62075177, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLST201804, Acronym: -, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: XJS190508, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: XJS210503, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work was supported by the National Natural Science Foundation of China (NSFC 62075177); the Natural Science Foundation of Shaanxi Province (2020JM-193 and 2020JQ-324), China Postdoctoral Science Foundation (2017M610623), the 111 Project, the Open Research Fund of State Key Laboratory of Transient Optics and Photonics (SKLST201804) and the Fundamental Research Funds for the Central Universities (XJS210503 and XJS190508).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212310459709
Title:Tilt Correction Toward Building Detection of Remote Sensing Images????(Open Access)
Authors:Liu, Kang (1, 5); Jiang, Zhiyu (2); Xu, Mingliang (3); Perc, Matjaz (4); Li, Xuelong (2)
Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) Key Laboratory of Intelligent Interaction and Applications, The School of Artificial Intelligence, Optics and Electronics, Northwestern Polytechnical University, Xi'an, China; (3) School of Information Engineering, Zhengzhou University, Zhengzhou, China; (4) Faculty of Natural Sciences and Mathematics, University of Maribor, Maribor, Slovenia; (5) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Li, Xuelong(li@nwpu.edu.cn)
Source title:IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Abbreviated source title:IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens.
Volume:14
Issue date:2021
Publication year:2021
Pages:5854-5866
Article number:9440788
Language:English
ISSN:19391404
E-ISSN:21511535
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Building detection is a crucial task in the field of remote sensing, which can facilitate urban construction planning, disaster survey, and emergency landing. However, for large-size remote sensing images, the great majority of existing works have ignored the image tilt problem. This problem can result in partitioning buildings into separately oblique parts when the large-size images are partitioned. This is not beneficial to preserve semantic completeness of the building objects. Motivated by the above fact, we first propose a framework for detecting objects in a large-size image, particularly for building detection. The framework mainly consists of two phases. In the first phase, we particularly propose a tilt correction (TC) algorithm, which contains three steps: texture mapping, tilt angle assessment, and image rotation. In the second phase, building detection is performed with object detectors, especially deep-neural-network-based methods. Last but not least, the detection results will be inversely mapped to the original large-size image. Furthermore, a challenging dataset named Aerial Image Building Detection is contributed for the public research. To evaluate the TC method, we also define an evaluation metric to compute the cost of building partition. The experimental results demonstrate the effects of the proposed method for building detection.
© 2008-2012 IEEE.
Number of references:59
Main heading:Object detection
Controlled terms:Antennas - Buildings - Deep neural networks - Historic preservation - Remote sensing - Semantics - Textures
Uncontrolled terms:Building detection - Detecting objects - Emergency landing - Evaluation metrics - Object detectors - Remote sensing images - Semantic completeness - Urban construction
Classification code:402 Buildings and Towers - 723.2 Data Processing and Image Processing
DOI:10.1109/JSTARS.2021.3083481
Funding details: Number: 61424010207, Acronym: -, Sponsor: -;Number: 61871470,62001397, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2020JQ-212, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:Manuscript received March 16, 2021; revised May 14, 2021; accepted May 21, 2021. Date of publication May 25, 2021; date of current version June 16, 2021. This work was supported in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, in part by the National Natural Science Foundation of China under Grant 61871470 and Grant 62001397, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2020JQ-212, and in part by the Open-Ended Foundation of National Radar Signal Processing Laboratory under Grant 61424010207. (Corresponding author: Xuelong Li.) Kang Liu is with the Shaanxi Key Laboratory of Ocean Optics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: liukang@opt.ac.cn).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212810608622
Title:Size effects in a hybrid plasmonic waveguide based power monitor with a bolometric method
Authors:Li, Yan (1); Chen, Anqi (1); Dai, Tingge (4); Chen, Weiwei (1); Liu, Hongjun (2); Wang, Pengjun (3)
Author affiliation:(1) Department of Electrical Engineering and Computer Science, Ningbo University, Ningbo, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an, China; (3) Department of Mathematics, Physics and Electronic Information Engineering, Wenzhou University, Wenzhou, China; (4) Department of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, China
Corresponding author:Chen, Anqi(chenanqi@nbu.edu.cnemailwangpengjun@wzu.edu.cn)Wang, Pengjun(wangpengjun@wzu.edu.cn)
Source title:Journal of Physics D: Applied Physics
Abbreviated source title:J Phys D
Volume:54
Issue:35
Issue date:September 2021
Publication year:2021
Article number:355107
Language:English
ISSN:00223727
E-ISSN:13616463
CODEN:JPAPBE
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

A silicon based hybrid plasmonic waveguide (HPW) configuration has been widely utilized to monitor the power flowing in the plasmonic circuit. Due to the approximately linear relationship between resistance and temperature change (the temperature coefficient of resistance, TCR), the voltage-signal variation directly leads to the change of resistance and the corresponding change of coupled-in power. However, the size effect is rarely explored and demonstrated, which plays a substantial role while the metal-strip thickness approaches to its electron mean free path. It exhibits different electric properties, such as reduced TCR and thermal conductivity, resulting in deviations of resistivity. On the contrary, due to the increase of boundary scattering and narrow-strip absorption, an improvement of the responsivity and excepted sensitivity is found. Therefore, considering a trade-off associated with size effects, 50 nm silver-strip and gold-strip were utilized as the conductor layer in the HPW configuration with different geometries, respectively. Meanwhile, a 50 nm 300 nm gold-strip HPW provides an improvement performance, up to 13.7 mV mW V-1, 0.05 μW sensitivity at bias 0.1 V. Its responsivity is about 1.4 times larger than that of silver, which contradicts to the macroscopic model.
© 2021 IOP Publishing Ltd.
Number of references:20
Main heading:Strip metal
Controlled terms:Economic and social effects - Gold - Plasmonics - Silver - Size determination - Temperature - Thermal conductivity - Waveguides
Uncontrolled terms:Boundary scattering - Different geometry - Electron mean free path - Hybrid plasmonic waveguides - Linear relationships - Plasmonic circuits - Temperature changes - Temperature coefficient of resistance
Classification code:535.1 Metal Rolling - 547.1 Precious Metals - 641.1 Thermodynamics - 714.3 Waveguides - 971 Social Sciences
Numerical data indexing:Power 5.00e-08W, Size 3.00e-07m, Size 5.00e-08m, Voltage 1.00e-01V
DOI:10.1088/1361-6463/ac0927

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212710597259
Title:Loosening mechanism and stress-resistance mapping relationship of electrical connector under triaxial random vibration
Title of translation:三轴随机振动下电连接器的松动机理及应力-电阻映射关系研究
Authors:Liu, Shaojie (1); Qiu, Yuanying (1); Bai, Jin (1); Du, Jiangong (1); Li, Jing (1); Wang, Haidong (2); Wang, Zhaoxi (2); Zhang, Lei (3)
Author affiliation:(1) School of Mechano-Electronic Engineering, Xidian University, Xi'an; 710071, China; (2) Shanghai Spaceflight Precision Machinery Research Institute, Shanghai; 201600, China; (3) China Aviation Optical-Electrical Technology Co., Ltd., Luoyang; 471000, China
Corresponding author:Qiu, Yuanying
Source title:Zhendong yu Chongji/Journal of Vibration and Shock
Abbreviated source title:J Vib Shock
Volume:40
Issue:11
Issue date:June 15, 2021
Publication year:2021
Pages:190-195
Language:Chinese
ISSN:10003835
Document type:Journal article (JA)
Publisher:Chinese Vibration Engineering Society
Abstract:

Under multi-axis complex vibration environment, an electrical connector structure may be loose to affect electrical contact performance of its electrical appliances and cause failure of equipment function. Here, in order to explore mechanical characteristics of electrical connector in loosening process under multi-axis random vibration environment, a model of electrical connector in missile electronic cabin was established. The change time history of contact pressure in pin's withdrawing process during it being loose relative to pinhole was simulated under random vibration environment, and the stress evolution mechanism in loosening process of electrical connector was revealed. Through comparing stress varying trend under triaxial random vibration and that under uniaxial random vibration, according to differences of three intervals, looseness characteristics of electrical connector under triaxial vibration were compared with those under uniaxial vibration, and a triaxial vibration stress screening method for connector looseness was provided. The mapping relationship between stress and resistance of electrical connector was derived by using R.Holm expression for relation between contact resistance and contact pressure, and the monitoring of contact stress between pin and pinhole was converted into monitoring of contact resistance to solve the technical problem of dynamic stress inside pinhole being difficult to measure.
© 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
Number of references:18
Main heading:Vibrations (mechanical)
Controlled terms:Contact resistance - Electric connectors - Mapping - Mechanisms
Uncontrolled terms:Electrical appliances - Electrical connectors - Electrical contacts - Loosening mechanism - Mapping relationships - Mechanical characteristics - Triaxial vibrations - Vibration environment
Classification code:405.3 Surveying - 601.3 Mechanisms - 701.1 Electricity: Basic Concepts and Phenomena - 704.1 Electric Components - 931.1 Mechanics
DOI:10.13465/j.cnki.jvs.2021.11.027

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212610574504
Title:Histogram clustering for rapid time-domain fluorescence lifetime image analysis????(Open Access)
Authors:Li, Yahui (1, 2); Sapermsap, Natakorn (3); Yu, Jun (4); Tian, Jinshou (1, 2); Chen, Yu (3); Li, David Day-Uei (5)
Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Shaanxi, Xi'an; 710049, China; (2) Collaborative Innovation Center of Extreme Optics, Shanxi University, Shanxi, Taiyuan; 030006, China; (3) Department of Physics, Scottish Universities Physics Alliance, University of Strathclyde, Glasgow; G4 0NG, United Kingdom; (4) Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow; G4 0RE, United Kingdom; (5) Department of Biomedical Engineering, University of Strathclyde, Glasgow; G1 0NW, United Kingdom
Source title:Biomedical Optics Express
Abbreviated source title:Biomed. Opt. Express
Volume:12
Issue:7
Issue date:July 1, 2021
Publication year:2021
Pages:4293-4307
Language:English
E-ISSN:21567085
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We propose a histogram clustering (HC) method to accelerate fluorescence lifetime imaging (FLIM) analysis in pixel-wise and global fitting modes. The proposed method's principle was demonstrated, and the combinations of HC with traditional FLIM analysis were explained. We assessed HC methods with both simulated and experimental datasets. The results reveal that HC not only increases analysis speed (up to 106 times) but also enhances lifetime estimation accuracy. Fast lifetime analysis strategies were suggested with execution times around or below 30 µs per histograms on MATLAB R2016a, 64-bit with the Intel Celeron CPU (2950M @ 2GHz).
© 2021 OSA - The Optical Society. All rights reserved.
Number of references:46
Main heading:Time domain analysis
Controlled terms:Fluorescence imaging - Graphic methods
Uncontrolled terms:Fluorescence lifetime imaging - Fluorescence lifetimes - Global fitting - Histogram clustering - Lifetime analysis - Lifetime estimation - Time domain
Classification code:921 Mathematics
Numerical data indexing:Frequency 2.00e+09Hz
DOI:10.1364/BOE.427532
Funding details: Number: -, Acronym: IPST, Sponsor: Institute for the Promotion of Teaching Science and Technology;Number: EP/L01596X/1, Acronym: EPSRC, Sponsor: Engineering and Physical Sciences Research Council;Number: 1179-2017, Acronym: MRS, Sponsor: Medical Research Scotland;Number: 12075312, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: CXJJ-21S006,XDA25030900, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:Funding. Science Foundation of the Chinese Academy of Sciences (CXJJ-21S006); Strategic Priority Research Program of Chinese Academy of Sciences (XDA25030900); National Natural Science Foundation of China (12075312); Medical Research Scotland (1179-2017); Engineering and Physical Sciences Research Council (EP/L01596X/1).Acknowledgments. N. Sapermsap acknowledges the Development and Promotion of Science and Technology Talents (DPST) Project under the Institute for the Promotion of Teaching Science and Technology (IPST), Thailand, for a PhD scholarship.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20212610569967
Title:Photonic microwave and RF channelizers based on Kerr micro-combs
Authors:Tan, M. (1); Xu, X. (2); Wu, J. (1); Boes, A. (3); Nguyen, T.G. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6); Mitchell, A. (3); Moss, D.J. (1)
Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, Rmit University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of Cas, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada
Corresponding author:Moss, D.J.(dmoss@swin.edu.au)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11685
Part number:1 of 1
Issue title:Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV
Issue date:2021
Publication year:2021
Article number:116850P
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510642058
Document type:Conference article (CA)
Conference name:Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV 2020
Conference date:March 6, 2021 - March 11, 2021
Conference location:Virtual, Online, United states
Conference code:169674
Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:

We review recent work on broadband RF channelizers based on integrated optical frequency Kerr microcombs combined with passive micro-ring resonator filters, with microcombs having channel spacings of 200GHz and 49GHz. This approach to realizing RF channelizers offers reduced complexity, size, and potential cost for a wide range of applications to microwave signal detection.
© 2021 SPIE.
Number of references:184
Main heading:Terahertz waves
Controlled terms:Optical resonators - Submillimeter waves
Uncontrolled terms:Channel spacings - Channelizers - Microcombs - Microring resonator - Microwave signal detection - Optical frequency - Photonic microwave - Reduced complexity
Classification code:711 Electromagnetic Waves - 741.3 Optical Devices and Systems
Numerical data indexing:Frequency 2.00e+11Hz, Frequency 4.90e+10Hz
DOI:10.1117/12.2584015

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211010043642
Title:A Real-Time Star Tailing Removal Method Based on Fast Blur Kernel Estimations????(Open Access)
Authors:Hou, Yaxian (1, 2, 3); Zhao, Rujin (1, 2, 3); Ma, Yuebo (1, 2, 3); He, Longdong (1, 2, 3); Zhu, Zifa (1, 2, 3)
Author affiliation:(1) Institute of Optics and Electronics of Chinese Academy of Sciences, Chengdu; 610209, China; (2) University of Chinese Academy of Sciences, Beijing; 100149, China; (3) Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement, CAS, Xi'an, China
Corresponding author:Zhao, Rujin(zrj0515@163.com)
Source title:Mathematical Problems in Engineering
Abbreviated source title:Math. Probl. Eng.
Volume:2021
Issue date:2021
Publication year:2021
Article number:8819277
Language:English
ISSN:1024123X
E-ISSN:15635147
Document type:Journal article (JA)
Publisher:Hindawi Limited
Abstract:The number of star points and the accuracy of star centroid extraction are the key factors that affect the performance of the star sensor under high dynamic conditions. The motion blur results in the star point trailing, which consequently leads to the decline of star centroid extraction accuracy and in some cases lead to extraction failure. In order to improve the dynamic performance of the star sensor, in this work, we propose a real-time star trailing removal method based on fast blur kernel estimation. First, in order to minimize the influence of noise on parameter estimation, we use principal component analysis (PCA) in the dual-frequency spectrum domain to estimate the angle of blur kernel. In addition, an adjustable weighting method is proposed to estimate the length of blur kernel. So, we are able to quickly estimate the high-precision blur kernel based on a single degraded image. Moreover, an area filtering method based on the hyper-Laplacian prior recovery algorithm is also proposed. This algorithm quickly reconstructs the star points in the tracking windows and effectively removes the star point tailing in real time. The computational efficiency of the proposed algorithm is 5 times superior to the traditional method and 15 times superior to the existing accelerated iterative method. The experimental results show that the proposed algorithm removes the trailing star quickly and effectively, under low SNR. In addition, the proposed method effectively improves the number of extracted star points and the accuracies of star centroids.
© 2021 Yaxian Hou et al.
Number of references:37
Main heading:Stars
Controlled terms:Computational efficiency - Extraction - Frequency domain analysis - Frequency estimation - Iterative methods - Signal to noise ratio
Uncontrolled terms:Blur kernel estimations - Centroid extractions - Degraded images - Dual frequency - Dynamic performance - Filtering method - Recovery algorithms - Weighting methods
Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena - 716.1 Information Theory and Signal Processing - 802.3 Chemical Operations - 921.3 Mathematical Transformations - 921.6 Numerical Methods
DOI:10.1155/2021/8819277

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:6174383
Title:Design of supercontinuum laser hyperspectral light detection and ranging (LiDAR) (SCLaHS LiDAR)
Authors:Zhou, Guoqing (1, 2, 3); Zhou, Xiang (1, 2, 3); Song, Youjian (4); Xie, Donghui (5); Wang, Long (6); Yan, Guangjian (5); Hu, Minglie (4); Liu, Bowen (4); Shang, Weidong (7); Gong, Chenghu (6); Wang, Cheng (8); Huang, Huaguo (9); Zhao, Yiqiang (1); Liu, Zhigang (5); Zhang, Guangyun (2); Wang, Xing (10); Nie, Sheng (8); Ye, Mao (1); Liu, Songlin (11); Tan, Qiaofeng (12); Li, Ke (13); Wei, Fengyuan (14); Su, Wei (15); Tian, Jinshou (16); Ai, Qingkang (16); Yang, Lvyun (17); Song, Bo (6); Xu, Jiasheng (6); Zhang, Lieping (6); Li, Wei (6); Wang, Ruirui (9); Xue, Hao (6); Dong, Hao (13); Yu, Ying (11); Wang, Hongtao (14)
Author affiliation:(1) School of Microelectronics, Tianjin University, Tianjin, China; (2) The Center of Remote Sensing, Tianjin University, Tianjin, China; (3) Guangxi Key Laboratory for Spatial Information and Geomatics, Guilin University of Technology, Guilin, China; (4) School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, China; (5) Institute of Remote Sensing Science and Engineering, Beijing Normal University, Beijing, China; (6) Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun, China; (7) Beijing Institute of Space Mechanics and Electricity, China Academy of Space Technology, Beijing, China; (8) Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China; (9) Department of Forestry, The College of Forestry of Beijing Forestry University, Beijing, China; (10) Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China; (11) School of Spatial Geographic Information, National Digital Switching System Engineering and Technology RD Center, Zhengzhou, China; (12) Department of Precision Instruments, Tsinghua University, Beijing, China; (13) Tianjin Jinhang Institute of Technology Physics, China Aerospace Science and Industry Co., Ltd, Tianjin, China; (14) School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, China; (15) College of Land Science and Technology, China Agricultural University, Beijing, China; (16) Department of Product Research and Development, Beijing Laize Photoelectric Technology Co, Beijing, China; (17) Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
Corresponding author:Zhou, Guoqing(1227416902@qq.com)
Source title:International Journal of Remote Sensing
Abbreviated source title:Int. J. Remote Sens.
Volume:42
Issue:10
Issue date:2021
Publication year:2021
Pages:3731-3755
Language:English
ISSN:01431161
E-ISSN:13665901
CODEN:IJSEDK
Document type:Journal article (JA)
Publisher:Taylor and Francis Ltd.
Abstract:Traditional Light Detection and Rangings (LiDARs) can quickly collect high-accuracy of three-dimensional (3D) point cloud data at a designated wavelength (i.e., cannot obtain hyperspectral data), while the passive hyperspectral imager can collect rich spectral data of ground objects, but are lack of 3D spatial data. This paper presents one innovative study on the design of airborne-oriented supercontinuum laser hyperspectral (SCLaHS) LiDAR with 50 bands covering 400 nm to 900 nm at a spectral resolution of 10 nm and ground sampling distance (GSD) of 0.5 m. The major innovations include (1) development of the high-power narrow-pulse supercontinuum laser source covering 400 nm to 900 nm with 50 bands using multi-core microstructure fibre, all-polarization maintaining fibre and ultra-long cavity structure, (2) a miniaturized aberration correction holographic concave grating spectroscopic and streak tube technique are developed for 50 bands laser echoes detection at high spectral-spatial-temporal resolution and dynamic airborne platform, and (3) the algorithm theoretic basis for SCLaHS LiDAR point cloud data 3D geodetic coordination calculation, including in-flight airborne calibration algorithm. The initial experimental results demonstrated that the designed SCLaHS LiDAR is doable, and a prototype of the (SCLaHS) LiDAR intends to be implemented.
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
Number of references:42
Controlled terms:algorithm - correction - design - lidar - multispectral image - spatial data - spectral resolution
Classification code:71.8.5.4 Remote sensing: numerical and image analysis
DOI:10.1080/01431161.2021.1880662
Funding text:This paper is financially supported by the National Natural Science of China (the grant #: 41961065), Guangxi Science and Technology Base and Talent Project (the grant #: Guike AD19254002); the Guangxi Innovative Development Grand Program (the grant #: GuikeAA18118038 and GuikeAA18242048); Guangxi Natural Science Foundation for Innovation Research Team (the grant #: 2019GXNSFGA245001), Guilin Research and Development Plan Program (the grant #: 20190210-2), and the BaGuiScholars program of Guangxi.

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810613836
Title:Microcombs for ultrahigh bandwidth optical data transmission and neural networks????(Open Access)
Authors:Tan, M. (1); Xu, X. (2); Corcoran, B. (2); Wu, J. (1); Boes, A. (3); Nguyen, T. (3); Chu, S. (4); Little, B. (5); Morandotti, R. (6, 7); Mitchell, A. (3); Moss, D.J. (1)
Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi’an Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi’an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (7) Inst. of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11775
Part number:1 of 1
Issue title:Integrated Optics: Design, Devices, Systems and Applications VI
Issue date:2021
Publication year:2021
Article number:1177504
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643840
Document type:Conference article (CA)
Conference name:Integrated Optics: Design, Devices, Systems and Applications VI 2021
Conference date:April 19, 2021 - April 23, 2021
Conference location:Virtual, Online, Czech republic
Conference code:169856
Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:

We report ultrahigh bandwidth applications of Kerr microcombs to optical neural networks and to optical data transmission, at data rates from 44 Terabits/s (Tb/s) to approaching 100 Tb/s. Convolutional neural networks (CNNs) are a powerful category of artificial neural networks that can extract the hierarchical features of raw data to greatly reduce the network complexity and enhance the accuracy for machine learning tasks such as computer vision, speech recognition, playing board games and medical diagnosis [1-7]. Optical neural networks can dramatically accelerate the computing speed to overcome the inherent bandwidth bottleneck of electronics. We use a new and powerful class of micro-comb called soliton crystals that exhibit robust operation and stable generation as well as a high intrinsic efficiency with an extremely low spacing of 48.9 GHz. We demonstrate a universal optical vector convolutional accelerator operating at 11 Tera-OPS/s (TOPS) on 250,000 pixel images for 10 kernels simultaneously — enough for facial image recognition. We use the same hardware to sequentially form a deep optical CNN with ten output neurons, achieving successful recognition of full 10 digits with 900 pixel handwritten digit images. We also report world record high data transmission over standard optical fiber from a single optical source, at 44.2 Terabits/s over the C-band, with a spectral efficiency of 10.4 bits/s/Hz, with a coherent data modulation format of 64 QAM. We achieve error free transmission across 75 km of standard optical fiber in the lab and over a field trial with a metropolitan optical fiber network. Our work demonstrates the ability of optical soliton crystal micro-combs to exceed other approaches in performance for the most demanding practical optical communications applications.
© 2021 SPIE.
Number of references:129
Main heading:Data communication systems
Controlled terms:Bandwidth - Character recognition - Computer games - Convolution - Convolutional neural networks - Crystals - Data transfer - Diagnosis - Efficiency - Image recognition - Integrated optics - Light transmission - Optical communication - Optical fibers - Pixels - Solitons - Speech recognition
Uncontrolled terms:Bandwidth bottlenecks - Communications applications - Error free transmission - Facial image recognition - Hierarchical features - Optical data transmission - Optical fiber networks - Optical neural networks
Classification code:461.6 Medicine and Pharmacology - 716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems - 723.5 Computer Applications - 741.1 Light/Optics - 741.1.2 Fiber Optics - 751.5 Speech - 913.1 Production Engineering - 933.1 Crystalline Solids
Numerical data indexing:Bit_Rate 1.00e+14bit/s, Frequency 4.89e+10Hz, Size 7.50e+04m, Spectral_Efficiency 1.04e+01bit/s/Hz
DOI:10.1117/12.2588733

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20210609875212
Title:In situ lunar phase curves measured by Chang'E-4 in the von Kármán Crater, South Pole-Aitken basin
Authors:Jiang, Te (1); Hu, Xiaoyi (1); Zhang, Hao (1, 2); Ma, Pei (1); Li, Chunlai (3); Ren, Xin (3); Liu, Bin (3); Liu, Dawei (3); Yang, Jianfeng (4); Xue, Bin (4); Jin, Weidong (5); Zhu, Meng-Hua (6); Huang, Changning (7); Lin, Hongyu (7)
Author affiliation:(1) Planetary Science Institute, School of Earth Sciences, China University of Geosciences, Wuhan, China; (2) CAS Center for Excellence in Comparative Planetology, Hefei, China; (3) Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China; (4) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (5) Department of Physics and Astronomy, The University of Alabama, Tuscaloosa; AL, United States; (6) State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa, China; (7) Beijing Institute of Space Mechanics and Electronics, China Academy of Space Technology, Beijing, China
Corresponding author:Zhang, Hao(zhanghao@cug.edu.cnemailliudw@nao.cas.cn)Liu, Dawei(liudw@nao.cas.cn)
Source title:Astronomy and Astrophysics
Abbreviated source title:Astron. Astrophys.
Volume:646
Issue date:February 1, 2021
Publication year:2021
Article number:A2
Language:English
ISSN:00046361
E-ISSN:14320746
CODEN:AAEJAF
Document type:Journal article (JA)
Publisher:EDP Sciences
Abstract:Context. The Yutu-2 rover of the Chang'E-4 (CE-4) mission measured the lunar phase curves in the Von Kármán crater, South Pole-Aitken basin. Aims. We aim to study the photometric properties of the regolith at CE-4's landing site and compare them with those of Chang'E-3 (CE-3) in order to understand the regolith physical properties of the two landing sites. Methods. We extracted the insitu lunar phase curves measured by CE-4 with a very wide phase angle coverage (1°-144°) and performed photometric model inversions using both the Hapke model and the Lumme-Bowell model. Results. Compared with the CE-3 measurement taken in Mare Imbrium, the CE-4 phase curves show the colorimetric opposition effect and have a steeper and narrower opposition spike. The surface regolith at the CE-4 site is much darker, more porous, more forward scattering, and has a larger slope angle (Hapke model) than that of CE-3. Conclusions. The CE-4 site may have experienced more space weathering alterations than the CE-3 site, which is consistent with their different surface model ages (∼3.6 Ga for CE-4 and ∼3 Ga for CE-3).
© ESO 2021.
Number of references:55
Main heading:Lunar missions
Controlled terms:Forward scattering - Photometry - Poles
Uncontrolled terms:Landing site - Model inversion - Opposition effects - Phase angles - Photometric properties - South Pole-Aitken basins - Space weathering - Surface modeling
Classification code:408.2 Structural Members and Shapes - 711 Electromagnetic Waves - 941.4 Optical Variables Measurements
DOI:10.1051/0004-6361/202039252

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204709498999
Title:Ultrafast spin current generated from an antiferromagnet
Authors:Qiu, Hongsong (1); Zhou, Lifan (2); Zhang, Caihong (1); Wu, Jingbo (1); Tian, Yuanzhe (2); Cheng, Shaodong (3); Mi, Shaobo (3); Zhao, Haibin (4); Zhang, Qi (5); Wu, Di (2); Jin, Biaobing (1); Chen, Jian (1); Wu, Peiheng (1)
Author affiliation:(1) Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, China; (2) National Laboratory of Solid State Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Nanjing University, Nanjing, China; (3) State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, China; (4) Shanghai Ultra-precision Optical Manufacturing Engineering Research Center, and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai, China; (5) Department of Physics, Nanjing University, Nanjing, China
Corresponding author:Jin, Biaobing(bbjin@nju.edu.cnemaildwu@nju.edu.cn)Wu, Di(dwu@nju.edu.cn)
Source title:Nature Physics
Abbreviated source title:Nat. Phys.
Volume:17
Issue:3
Issue date:March 2021
Publication year:2021
Pages:388-394
Language:English
ISSN:17452473
E-ISSN:17452481
Document type:Journal article (JA)
Publisher:Nature Research
Abstract:Antiferromagnets (AFMs) have the potential to push spintronic devices from a static condition or gigahertz frequency range to the terahertz range for the sake of high-speed processing. However, the insensitivity of AFMs to magnetic fields makes the manipulation of spin currents difficult. The ultrafast generation of the spin current in ferromagnet/heavy-metal (HM) structures has received a lot of attention in recent years, but whether a similar scenario can be observed in an AFM/HM system is still unknown. Here, we show the optical generation of ultrafast spin current in an AFM/HM heterostructure at zero external magnetic field and at room temperature by detecting the associated terahertz emission. We believe that this is a common phenomenon in antiferromagnets with strong nonlinear optical effects. Our results open an avenue of fundamental research into antiferromagnetism and a route to AFM spintronic devices.
© 2020, The Author(s), under exclusive licence to Springer Nature Limited.
Number of references:44
Main heading:Spin fluctuations
Controlled terms:Antiferromagnetic materials - High speed cameras - Magnetic fields
Uncontrolled terms:External magnetic field - Fundamental research - Gigahertz frequencies - High-speed processing - Nonlinear optical effects - Optical generation - Spintronic device - Terahertz emissions
Classification code:701.2 Magnetism: Basic Concepts and Phenomena - 708.4 Magnetic Materials - 742.2 Photographic Equipment - 931.3 Atomic and Molecular Physics
DOI:10.1038/s41567-020-01061-7
Funding details: Number: 11674159,11727808,61521001,61671234,61731010, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFA0700200, Acronym: MOST, Sponsor: Ministry of Science and Technology of the People's Republic of China;Number: BK20190300, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: 2017YFA0303202,2017YFA0700202, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: -, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work was partially supported by the National Natural Science Foundation of China (grant nos. 61521001, 61731010, 61671234, 11727808 and 11674159), National Key Research and Development Program of China (grant nos. 2017YFA0700202 and 2017YFA0303202), and Natural Science Foundation of Jiangsu Province (grant no. BK20190300). It was also partially supported by the Fundamental Research Funds for the Central Universities and by the Jiangsu Key Laboratory of Advanced Techniques for Manipulating Electromagnetic Waves. We acknowledge B. G. Wang and C. Zhang for their discussion on the mechanism of the spin current generation. We thank Y. F. Nie for helping to confirm the crystallographic orientation of the sample through the φ-scan measurement.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910311241
Title:High Contrast Imaging through Infrared Chalcogenide Imaging Fiber Bundle Illuminated by Quantum Cascade Laser
Title of translation:基于量子级联激光器照明的高对比度红外内窥成像
Authors:Yu, Taoying (1); Yuan, Yifang (1, 2); Li, Yunxuan (3); Han, Dong (1); Zhu, Jiaying (1, 4)
Author affiliation:(1) Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing; 100071, China; (2) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (3) China Academy of Launch Vehicle Technology, Beijing; 100076, China; (4) School of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin; 300072, China
Corresponding author:Yu, Taoying(ytyccc@163.com)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:3
Issue date:March 25, 2021
Publication year:2021
Article number:0306001
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

A fiber bundle made of 12×9 individual Ge-As-Te-Se fibers with a core diameter of 20 μm has been tested for optical properties and used to carry out the imaging experiment. A 5~11 μm continuous tunable quantum cascade laser has been used to test the bundle's attenuation property with a cut-back method. The attenuation of bundle is nearly 1 dB/cm in the spectral region. A compact distal objective lens with length of 13.6 mm and diameter of 6 mm based on telecentric system has been designed and fabricated. The MTF of the lens showed the ablitity to transmit the image with resolution of 25 μm. A infrared image with 2 mm×2 mm and 100 μm resolution with quantum cascade lasers illumination, which has high power spectrum density and narrow linewidth, has been captured. A comparison experiment about the environmental temperature has been conducted illuminated by quantum cascade laser and incoherent black body, it proved that the quantum cascade laser illumination could help build a high SNR imaging under a high environmental temperature even above human's temperature. It would be meaningful for the next infrared endoscopy experiment in vivo way.
© 2021, Science Press. All right reserved.
Number of references:21
Main heading:Quantum cascade lasers
Controlled terms:Germanium compounds - Infrared imaging - Optical properties - Selenium compounds - Tellurium compounds
Uncontrolled terms:Attenuation properties - Cut-back method - Environmental temperature - High contrast imaging - Imaging experiments - Imaging fiber bundle - Narrow-line width - Telecentric system
Classification code:741.1 Light/Optics - 744.1 Lasers, General - 746 Imaging Techniques
Numerical data indexing:Size 1.00e-04m, Size 1.36e-02m, Size 2.00e-05m, Size 2.50e-05m, Size 5.00e-06m to 1.10e-05m, Size 6.00e-03m
DOI:10.3788/gzxb20215003.0306001
Funding details: Number: 11622542, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:item：National Natural Science Foundation of China（No. 11622542）

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213710879633
Title:Paraxial 3D shape measurement using parallel single-pixel imaging????(Open Access)
Authors:Wang, Yunfan (1); Zhao, Huijie (1); Jiang, Hongzhi (1); Li, Xudong (1, 2); Li, Yuxi (1, 2); Xu, Yang (3)
Author affiliation:(1) Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing; 100191, China; (2) Beihang University Qingdao Research Institute, Qingdao; 266101, China; (3) School of Information Science and Technology, Northwest University, Xi'an; 710127, China
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:19
Issue date:September 13, 2021
Publication year:2021
Pages:30543-30557
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Three-dimensional (3D) shape measurement with fringe projection technique and vertical scanning setup can alleviate the problem of shadow and occlusion. However, the shape-from-defocus based method suffers from limited sensitivity and low signal-to-noise ratio (SNR), whereas the projection-triangulation based is sensitive to the zero-phase detection. In this paper, we propose paraxial 3D shape measurement using parallel single-pixel imaging (PSI). The depth is encoded in the radial distance to the projector optical center, which is determined by the projection of light transport coefficients (LTCs). The third-order polynomial fitting is used for depth mapping and calibration. Experiments on 5 objects with different materials and textures are conducted, and standards are measured to test the accuracy. The results verified that the proposed method can achieve robust, dense reconstruction with depth accuracy at 20 μm while the root-mean-square error (RMSE) of plane fitting up to 43 μm.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Number of references:23
Main heading:Signal to noise ratio
Controlled terms:Mean square error - Pixels - Textures
Uncontrolled terms:3-d shape measurement - Fringe projection techniques - Limited sensitivity - Low signal-to-noise ratio - Root mean square errors - Shape-from-defocus - Three dimensional (3 D) shape measurement - Triangulation-based
Classification code:716.1 Information Theory and Signal Processing - 922.2 Mathematical Statistics
Numerical data indexing:Size 2.00e-05m, Size 4.30e-05m
DOI:10.1364/OE.435470
Funding details: Number: 61735003,61875007, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2020YFB2010701, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding. National Key Research and Development Program of China (2020YFB2010701); National Natural Science Foundation of China (61735003, 61875007).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20205209683434
Title:Single-Photon Counting Laser Ranging with Optical Frequency Combs
Authors:Ren, Xinyi (1); Xu, Bo (2); Fei, Qilai (3); Liang, Yan (2); Ge, Jinman (4); Wang, Xiaoyue (1); Huang, Kun (1, 3); Yan, Ming (1, 3); Zeng, Heping (1, 3)
Author affiliation:(1) State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China; (2) Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, China; (3) Chongqing Institute, East China Normal University, Chongqing, China; (4) National Key Laboratory of Science and Technology on Space Microwave, CAST, Xi'an, China
Corresponding author:Yan, Ming(myan@lps.ecnu.edu.cnemailyanliang@usst.edu.cn)Liang, Yan(yanliang@usst.edu.cn)
Source title:IEEE Photonics Technology Letters
Abbreviated source title:IEEE Photonics Technol Lett
Volume:33
Issue:1
Issue date:January 1, 2021
Publication year:2021
Pages:27-30
Article number:9281096
Language:English
ISSN:10411135
E-ISSN:19410174
CODEN:IPTLEL
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Time-of-flight single-photon counting laser ranging offers an important tool for remote sensing and imaging. However, limited by the temporal properties of a single-photon detection and counting system, it encounters a challenge for high-resolution and high-precision distance metrology. Here, we incorporated dual-comb based laser ranging, an enabling technique for rapid distance measurements with high precision and large range ambiguity, with time-correlated single-photon counting (TCSPC) technology and demonstrated its feasibility for precise laser ranging under a photon-starved condition. Based on interferometric measurements of two asynchronous 2.8-pW, 25-GHz electro-optic laser combs with TCSPC, micrometer-level ranging precision was achieved for consistent distance measurements (a stand-off distance of 15.6 m) over several days. New opportunities might open up for high-resolution and high-precision single-photon counting laser ranging.
© 1989-2012 IEEE.
Number of references:26
Main heading:Particle beams
Controlled terms:Photons - Remote sensing
Uncontrolled terms:Distance metrology - Enabling techniques - Interferometric measurement - Optical frequency combs - Single photon counting - Single photon detection - Stand-off distance (SoD) - Time-correlated single-photon counting
Classification code:931.3 Atomic and Molecular Physics - 932.1 High Energy Physics
Numerical data indexing:Frequency 2.50e+10Hz, Power 2.80e-12W, Size 1.56e+01m
DOI:10.1109/LPT.2020.3042499
Funding details: Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 18JC1412000, Acronym: -, Sponsor: -;Number: 6142411196316, Acronym: -, Sponsor: National Key Laboratory Foundation of China;Number: 11804100,11904283, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019SHZDZX01, Acronym: -, Sponsor: -;
Funding text:This work was supported in part by the Natural National Science Foundation of China (NSFC) under Grant 11804100 and Grant 11904283, in part by the National Key Laboratory Foundation under Contract 6142411196316, in part by the Shanghai Municipal Science and Technology Major Project under Grant 2019SHZDZX01, and in part by the Science and Technology Innovation Program of Basic Science Foundation of Shanghai under Grant 18JC1412000.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110702575
Title:Two-step randomized design of multi-rings metallic mesh for ultra-uniform diffraction distribution
Authors:Lu, Zhengang (1, 2, 3); Zhang, Yilei (1, 2); Lu, Xi (1, 2); Wang, Heyan (1, 2); Tan, Jiubin (1, 2)
Author affiliation:(1) Center of Ultra-precision Optoelectronic Instrument engineering, Harbin Institute of Technology, Harbin; 150080, China; (2) Key Lab of Ultra-precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin; 150080, China; (3) State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an; 710024, China
Corresponding author:Lu, Zhengang(luzhengang@hit.edu.cn)
Source title:Optics and Laser Technology
Abbreviated source title:Opt Laser Technol
Volume:144
Issue date:December 2021
Publication year:2021
Article number:107396
Language:English
ISSN:00303992
CODEN:OLTCAS
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

We propose a random multi-rings metallic mesh (RMR-MM) with the two-step randomized design process. By randomly shrinking the radii and changing the center positions of the basic rings, adding and interrupting the external common tangent rings, filling random sub-rings and supplementary rings, the superposition probability of diffraction spots generated by the multi-rings is reduced to a ultra-low level and thus ultra-uniform diffraction pattern is achieved. Experiment shows that the maximum high-order diffraction energy of RMR-MM experience an 85.96% drop from that of traditional triangle-distributed basic ring mesh, while the average normalized visible transmittance as high as 95.76% in 400–700 nm is achieved. In addition, the 200-nm-thick aluminum RMR-MM exhibits an electromagnetic shielding effectiveness of over 17.5 dB in the Ku-band. These excellent properties indicate RMR-MM is favorable in transparent electrodes as well as electromagnetic interference shielding application for optically transparent devices.
© 2021 Elsevier Ltd
Number of references:34
Main heading:Mesh generation
Controlled terms:Design - Diffraction - Electromagnetic pulse - Electromagnetic shielding - Electromagnetic wave interference - Signal interference - Transparent electrodes
Uncontrolled terms:Design-process - Diffraction spots - Electromagnetic interference shielding - Higher-order diffraction - Metallic mesh - MultiRing - Optical transparency - Randomized design - Transparent conductors - Uniform diffraction
Classification code:701 Electricity and Magnetism - 711 Electromagnetic Waves - 716.1 Information Theory and Signal Processing - 723.5 Computer Applications - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Numerical data indexing:Decibel 1.75E+01dB, Percentage 8.596E+01%, Percentage 9.576E+01%, Size 2.00E-07m, Size 7.00E-07m
DOI:10.1016/j.optlastec.2021.107396
Funding details: Number: 61975046, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLIPR1809, Acronym: -, Sponsor: State Key Laboratory of Intense Pulsed Radiation Simulation and Effect;
Funding text:We also wish to express our sincere gratitude to CST Computer Simulation Technology GmbH, Germany, for providing a free package of CST Studio Suite at the CST Training Center (Northeast China Region) in our university. This work was supported by National Natural Science Foundation of China (NSFC) (61975046), and State Key Laboratory of Intense Pulsed Radiation Simulation and Effect (SKLIPR1809).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213210724378
Title:Separation of interreflections based on parallel single-pixel imaging????(Open Access)
Authors:JIANG, HONGZHI (1, 2); YAN, YONGJING (1); LI, XUDONG (1, 2); ZHAO, HUIJIE (1, 2); LI, YUXI (1, 2); XU, YANG (3)
Author affiliation:(1) Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing; 100191, China; (2) Beihang University Qingdao Research Institute, Qingdao; 266101, China; (3) School of Information Science and Technology, Northwest University, Xi'an; 710127, China
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:16
Issue date:August 2, 2021
Publication year:2021
Pages:26150-26164
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Interreflections introduced by points in a scene are not only illuminated by the light source used but also by other points in the scene. Interreflections cause inaccuracy and the failure of 3D recovery and optical measurements. In this research, a novel method for separating interreflections through parallel single-pixel imaging (PSI) is proposed, which can decompose interreflections into 1st bounce light, 2nd bounce light, and a higher order light component. PSI is used in obtaining the light transport coefficients of each camera pixel, and light transport coefficients are used in decomposing the intensity distribution of a projector and the component of interreflections. Results show that the proposed method can separate the interreflections of a real static scene in a concave surface.
© 2021 Optical Society of America.
Number of references:29
Main heading:Reflection
Controlled terms:Light sources - Light transmission - Optical data processing - Pixels - Separation
Uncontrolled terms:3-D recovery - Concave surface - Higher-order - Intensity distribution - Interreflections - Light transport - Optical measurement - Single pixel
Classification code:723.2 Data Processing and Image Processing - 741.1 Light/Optics - 802.3 Chemical Operations
DOI:10.1364/OE.424777
Funding details: Number: 18-1-2-22-zhc, Acronym: -, Sponsor: -;Number: 61735003,61875007, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018A030313797, Acronym: -, Sponsor: Natural Science Foundation of Guangdong Province;Number: 2020YFB2010701, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding. National Key Research and Development Program of China (2020YFB2010701); National Natural Science Foundation of China (61735003, 61875007); Leading Talents Program for Enterpriser and Innovator of Qingdao (18-1-2-22-zhc); Natural Science Foundation of Guangdong Province (2018A030313797).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20213010676174
Title:Compressive parallel single-pixel imaging for efficient 3D shape measurement in the presence of strong interreflections by using a sampling Fourier strategy????(Open Access)
Authors:LI, YUXI (1, 2); JIANG, HONGZHI (1, 2); ZHAO, HUIJIE (1, 2); LI, XUDONG (1, 2); WANG, YUNFAN (1); XU, YANG (3)
Author affiliation:(1) Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road Haidian District, Beijing; 100191, China; (2) Beihang University Qingdao Research Institute, Qingdao; 266101, China; (3) School of Information Science and Technology, Northwest University, Xi'an; 710127, China
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:16
Issue date:August 2, 2021
Publication year:2021
Pages:25032-25047
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We present a compressive parallel single-pixel imaging (cPSI) method, which applies compressive sensing in the context of PSI, to achieve highly efficient light transport coefficients capture and 3D reconstruction in the presence of strong interreflections. A characteristic-based sampling strategy is introduced that has sampling frequencies with high energy and high probability. The characteristic-based sampling strategy is compared with various state-of-the-art sampling strategies, including the square, circular, uniform random, and distance-based sampling strategies. Experimental results demonstrate that the characteristic-based sampling strategy exhibits the best performance, and cPSI can obtain highly accurate 3D shape data in the presence of strong interreflections with high efficiency.
© 2021 Optical Society of America.
Number of references:32
Main heading:Reflection
Controlled terms:Pixels
Uncontrolled terms:3-d shape measurement - 3D reconstruction - Compressive sensing - High probability - Interreflections - Sampling frequencies - Sampling strategies - State of the art
DOI:10.1364/OE.433118
Funding details: Number: 18-1-2-22-zhc, Acronym: -, Sponsor: -;Number: 61735003,61875007, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020YFB2010701, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding. National Natural Science Foundation of China (61735003, 61875007); National Key Research and Development Program of China (2020YFB2010701); Leading Talents Program for Enterpriser and Innovator of Qingdao (18-1-2-22-zhc).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212110380609
Title:Photonic convolutional accelerator and neural network in the Tera-OPs regime based on Kerr microcombs????(Open Access)
Authors:Xu, Xingyuan (1); Tan, Mengxi (1); Corcoran, Bill (2); Wu, Jiayang (1); Boes, Andreas (3); Nguyen, Thach G. (3); Chu, Sai T. (4); Little, Brent E. (5); Hicks, Damien G. (1, 6); Morandotti, Roberto (7, 8); Mitchell, Arnan (3); Moss, David J. (1)
Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi'An Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville; VIC; 3052, Australia; (7) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X1S2, Canada; (8) Inst. of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China
Corresponding author:Moss, David J.
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11689
Part number:1 of 1
Issue title:Integrated Optics: Devices, Materials, and Technologies XXV
Issue date:2021
Publication year:2021
Article number:1168915
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510642133
Document type:Conference article (CA)
Conference name:Integrated Optics: Devices, Materials, and Technologies XXV 2021
Conference date:March 6, 2021 - March 11, 2021
Conference location:Virtual, Online, United states
Conference code:168803
Sponsor:Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:

We report a photonic RF arbitrary waveform generator and phase encoded signal generator using a soliton crystal micro-comb source with a free spectral range (FSR) of 48.9 GHz, that provides 80 wavelengths. We achieve arbitrary waveform shapes including square waveforms with a tunable duty ratio from 10% to 90%, sawtooth waveforms with a slope ratio of 0.2 to 1, and a symmetric concave quadratic chirp waveform with an instantaneous frequency of sub GHz. The phase encoded signal generator achieves a high pulse compression ratio of 30 and phase encoding rates from 2 to 6 Gb/s This work verifies the effectiveness of using microcombs for high-performance, broad bandwidth, nearly user-defined RF waveform generation.
© 2021 SPIE.
Number of references:95
Main heading:Switching networks
Controlled terms:Bandwidth compression - Integrated optics - Neural networks - Signal generators
Uncontrolled terms:Arbitrary waveform - Arbitrary waveform generator - Broad bandwidths - Chirp waveforms - Free spectral range - Instantaneous frequency - Sawtooth waveform - Waveform generation
Classification code:716.1 Information Theory and Signal Processing
Numerical data indexing:Bit_Rate 2.00e+09bit/s to 6.00e+09bit/s, Frequency 4.89e+10Hz, Percentage 1.00e+01% to 9.00e+01%
DOI:10.1117/12.2584017

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20212110381609
Title:Single perceptron at 12 GigaOPs based on a microcomb for versatile, high-speed scalable, optical neural networks????(Open Access)
Authors:Tan, M. (1); Xu, X. (2); Wu, J. (1); Boes, A. (3); Corcoran, B. (2); Nguyen, T.G. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6, 7); Mitchell, A. (3); Hicks, D.G. (1, 8); Moss, D.J. (1)
Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi'An Institute of Optics and Precision Mechanics Precision Mechanics, CAS, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X1S2, Canada; (7) Adjunct, Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China; (8) Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville; VIC; 3052, Australia
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11690
Part number:1 of 1
Issue title:Smart Photonic and Optoelectronic Integrated Circuits XXIII
Issue date:2021
Publication year:2021
Article number:116900M
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510642157
Document type:Conference article (CA)
Conference name:Smart Photonic and Optoelectronic Integrated Circuits XXIII 2021
Conference date:March 6, 2021 - March 11, 2021
Conference location:Virtual, Online, United states
Conference code:168804
Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:

Optical artificial neural networks (ONNs) have significant potential for ultra-high computing speed and energy efficiency. We report a novel approach to ONNs that uses integrated Kerr optical micro-combs. This approach is programmable and scalable and is capable of reaching ultra-high speeds. We demonstrate the basic building block ONNs- A single neuron perceptron-by mapping synapses onto 49 wavelengths to achieve an operating speed of 11.9 x 109 operations per second, or Giga-OPS, at 8 bits per operation, which equates to 95.2 gigabits/s (Gbps). We test the perceptron on handwritten-digit recognition and cancer-cell detection- A chieving over 90% and 85% accuracy, respectively. By scaling the perceptron to a deep learning network using off-the-shelf telecom technology we can achieve high throughput operation for matrix multiplication for real-time massive data processing.
© 2021 SPIE.
Number of references:103
Main heading:Neural networks
Controlled terms:Character recognition - Data handling - Deep learning - Energy efficiency - Green computing - Photonic integration technology
Uncontrolled terms:Basic building block - Cancer cell detection - Handwritten digit recognition - High-throughput operation - Learning network - MAtrix multiplication - Optical neural networks - Ultra high speed
Classification code:525.2 Energy Conservation - 714.2 Semiconductor Devices and Integrated Circuits - 723.2 Data Processing and Image Processing
Numerical data indexing:Percentage 8.50e+01%, Percentage 9.00e+01%
DOI:10.1117/12.2584011

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20213710877203
Title:A novel two-stage martensitic transformation induced by nanoscale concentration modulation in a TiNb-based shape memory alloy
Authors:Zhu, Jiaming (1); Zhang, Gang (2); Huang, He (3); Wang, Dong (4); Chen, Peijian (5); Yang, Xusheng (6, 7)
Author affiliation:(1) School of Civil Engineering, Shandong University, Jinan; 250061, China; (2) School of Physics and Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji; 721016, China; (3) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing; 100083, China; (4) Center of Microstructure Science, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an; 710049, China; (5) State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou; Jiangsu; 221116, China; (6) State Key Laboratory of Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; (7) Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China
Corresponding author:Zhu, Jiaming(zhujiaming@sdu.edu.cn)
Source title:Computational Materials Science
Abbreviated source title:Comput Mater Sci
Volume:200
Issue date:December 2021
Publication year:2021
Article number:110843
Language:English
ISSN:09270256
CODEN:CMMSEM
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Martensitic transformation (MT) plays a critical role in determining both mechanical and functional properties of shape memory alloys (SMAs). The behavior of MT depends strongly on the microstructure of materials, and two- or multiple-stage MTs are typical examples of this. However, the physical origin of two- or multiple-stage MTs remains controversial although much effort has been made. In this study, a novel two-stage MT is observed in a TiNb-based SMA with nanoscale concentration modulation. The physical origin of this chemical-heterogeneity-induced two-stage MT is the difference in thermodynamic stability of the parent and martensitic phase between Nb-leaner and Nb-richer regions. The findings of this study not only expand the repertoire of mechanisms of two- or multiple-stage MT but also shed light on the long-standing controversy over the physical origin of multiple-stage MTs.
© 2021 Elsevier B.V.
Number of references:38
Main heading:Martensitic transformations
Controlled terms:Chemical stability - Modulation - Nanotechnology - Shape-memory alloy - Thermodynamic stability - Titanium alloys
Uncontrolled terms:Chemical heterogeneities - Concentration modulation - Functional properties - Mechanical - Multiple stages - Nano scale - Parent phase - Phase field methods - Transformation-Induced - Two-stage martensitic transformation
Classification code:531.2 Metallography - 542.3 Titanium and Alloys - 641.1 Thermodynamics - 761 Nanotechnology - 801 Chemistry
DOI:10.1016/j.commatsci.2021.110843
Funding details: Number: 19JK0039, Acronym: -, Sponsor: Education Department of Shaanxi Province;Number: 51701171, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:JZ acknowledges the support of Qilu Young Talent Program from Shandong University and the State Key Lab of Advanced Metals and Materials (Grant No. 2021-Z10). GZ acknowledges the financial support from the Scientific Research Program Funded by Shaanxi Provincial Education Department (Program No. 19JK0039). XY acknowledges the support of the National Natural Science Foundation of China (Grants No. 51701171). The data that support the findings of this study are available from the corresponding authors upon request.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210910009286
Title:Nonlinear iterative perturbation scheme with simplified spherical harmonics (SP3) light propagation model for quantitative photoacoustic tomography
Authors:Wang, Yihan (1, 2); Xu, Menglu (1, 2); Gao, Feng (3, 4); Kang, Fei (5); Zhu, Shouping (1, 2)
Author affiliation:(1) School of Life Science and Technology, Xidian University, Xi'an, China; (2) Engineering Research Center of Molecular and Neuro Imaging of Ministry of Education, Xi'an, China; (3) College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, China; (4) Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin, China; (5) Department of Nuclear Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
Corresponding author:Zhu, Shouping(spzhu@xidian.edu.cn)
Source title:Journal of Biophotonics
Abbreviated source title:J. Biophotonics
Volume:14
Issue:6
Issue date:June 2021
Publication year:2021
Article number:e202000446
Language:English
ISSN:1864063X
E-ISSN:18640648
Document type:Journal article (JA)
Publisher:John Wiley and Sons Inc
Abstract:

When using quantitative photoacoustic tomography (q-PAT) reconstruction to recover the optical absorption coefficients of tissue, the commonly used diffusion equation has several limitations in the case of the objects that have small geometries and high-absorption or low-scattering areas. Furthermore, the conventional perturbation reconstruction strategy is unsatisfactory when the target tissue containing large heterogeneous features. We herein present a modified q-PAT implementation that employs the higher-order photon migration model achieving the tradeoff between mathematical rigidity and computational efficiency. Besides, a nonlinear iterative method is proposed to obtain the perturbations of optical absorption considering the updating of the sensitivity matrix in calculating the fluence perturbations. Consequently, the distribution of tissue optical properties can be recovered in a robust way even if the targets with high absorption are included. The proposed approach has been validated by simulation, phantom and in vivo experiments, exhibiting promising performances in image fidelity and quantitative feasibility for practical applications.
© 2021 Wiley-VCH GmbH
Number of references:51
Main heading:Nonlinear optics
Controlled terms:Computational efficiency - Iterative methods - Light absorption - Optical properties - Photoacoustic effect - Tissue - Tomography
Uncontrolled terms:Heterogeneous features - In-vivo experiments - Iterative perturbation - Nonlinear iterative method - Optical absorption coefficients - Photoacoustic tomography - Spherical harmonics - Tissue optical properties
Classification code:461.2 Biological Materials and Tissue Engineering - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 746 Imaging Techniques - 921.6 Numerical Methods
DOI:10.1002/jbio.202000446
Funding details: Number: 61471279,61901342,81871393, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JQ‐299, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2016YFC0103800, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:National Key Research and Development Program of China, Grant/Award Number: 2016YFC0103800; National Natural Science Foundation of China, Grant/Award Numbers: 61471279, 61901342, 81871393; National Natural Science Foundation of Shaanxi Province, Grant/Award Number: 2020JQ‐299 Funding informationThe authors gratefully acknowledge the following grants support: the National Key Research and Development Program of China under Grant No. 2016YFC0103800, the National Natural Science Foundation of China under Grant Nos. 61901342, 61471279, 81871393 and the National Natural Science Foundation of Shaanxi Province under Grant No. 2020JQ‐299.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213010692676
Title:Penta-PdPSe: A New 2D Pentagonal Material with Highly In-Plane Optical, Electronic, and Optoelectronic Anisotropy
Authors:Li, Peiyang (1); Zhang, Jiantian (1); Zhu, Chao (2); Shen, Wanfu (3); Hu, Chunguang (3); Fu, Wei (4); Yan, Luo (5); Zhou, Liujiang (5); Zheng, Lu (6); Lei, Hongxiang (1); Liu, Zheng (2); Zhao, Weina (7); Gao, Pingqi (1); Yu, Peng (1); Yang, Guowei (1)
Author affiliation:(1) State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, School of Materials, Sun Yat-sen University, Guangzhou; 510275, China; (2) School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore; 639798, Singapore; (3) State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin; 300072, China; (4) Centre of Advanced 2D Materials, National University of Singapore, 1 Science Drive 3, Singapore; 117550, Singapore; (5) Institute of Fundamental and Frontier Sciences, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Chengdu; 610054, China; (6) Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an; 710072, China; (7) Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou; 510006, China
Corresponding author:Gao, Pingqi(gaopq3@mail.sysu.edu.cnemailyupeng9@mail.sysu.edu.cnemailzhaowngd@gdut.edu.cn)Peng, Yu(yupeng9@mail.sysu.edu.cnemailzhaowngd@gdut.edu.cn)Weina, Zhao(zhaowngd@gdut.edu.cn)
Source title:Advanced Materials
Abbreviated source title:Adv Mater
Volume:33
Issue:35
Issue date:September 2, 2021
Publication year:2021
Article number:2102541
Language:English
ISSN:09359648
E-ISSN:15214095
CODEN:ADVMEW
Document type:Journal article (JA)
Publisher:John Wiley and Sons Inc
Abstract:

Due to their low-symmetry lattice characteristics and intrinsic in-plane anisotropy, 2D pentagonal materials, a new class of 2D materials composed entirely of pentagonal atomic rings, are attracting increasing research attention. However, the existence of these 2D materials has not been proven experimentally until the recent discovery of PdSe2. Herein, penta-PdPSe, a new 2D pentagonal material with a novel low-symmetry puckered pentagonal structure, is introduced to the 2D family. Interestingly, a peculiar polyanion of [Se-P-P-Se]4− is discovered in this material, which is the biggest polyanion in 2D materials yet discovered. Strong intrinsic in-plane anisotropic behavior endows penta-PdPSe with highly anisotropic optical, electronic, and optoelectronic properties. Impressively, few-layer penta-PdPSe-based phototransistor not only achieves excellent electronic performances, a moderate electron mobility of 21.37 cm2 V−1 s−1 and a high on/off ratio of up to 108, but it also has a high photoresponsivity of ≈5.07 × 103 A W−1 at 635 nm, which is ascribed to the photogating effect. More importantly, penta-PdPSe also exhibits a large anisotropic conductance (σmax/σmax = 3.85) and responsivity (Rmax/Rmin = 6.17 at 808 nm), superior to most 2D anisotropic materials. These findings make penta-PdPSe an ideal material for the design of next-generation anisotropic devices.
© 2021 Wiley-VCH GmbH
Number of references:66
Main heading:Anisotropy
Controlled terms:Materials science - Mechanical properties
Uncontrolled terms:Anisotropic behaviors - Anisotropic conductance - Anisotropic material - Electronic performance - In-plane anisotropy - On/off ratio - Optoelectronic properties - Photoresponsivity
Classification code:931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science
DOI:10.1002/adma.202102541

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212610574668
Title:Organelle-specific phase contrast microscopy enables gentle monitoring and analysis of mitochondrial network dynamics????(Open Access)
Authors:Guo, Siyue (1); Ma, Ying (1, 2); Pan, Yang (1); Smith, Zachary J. (1, 4); Chu, Kaiqin (1, 3, 4)
Author affiliation:(1) Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Anhui, Hefei; 230027, China; (2) School of Physics and Optoelectronic Engineering, Xidian University, Shanxi, Xi'an; 710071, China; (3) Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Anhui, Hefei; 230027, China; (4) Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Anhui, Hefei; 230027, China
Source title:Biomedical Optics Express
Abbreviated source title:Biomed. Opt. Express
Volume:12
Issue:7
Issue date:July 1, 2021
Publication year:2021
Pages:4363-4379
Language:English
E-ISSN:21567085
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Mitochondria are delicate organelles that play a key role in cell fate. Current research methods rely on fluorescence labeling that introduces stress due to photobleaching and phototoxicity. Here we propose a new, gentle method to study mitochondrial dynamics, where organelle-specific three-dimensional information is obtained in a label-free manner at high resolution, high specificity, and without detrimental effects associated with staining. A mitochondria cleavage experiment demonstrates that not only do the label-free mitochondria-specific images have the required resolution and precision, but also fairly include all cells and mitochondria in downstream morphological analysis, while fluorescence images omit dim cells and mitochondria. The robustness of the method was tested on samples of different cell lines and on data collected from multiple systems. Thus, we have demonstrated that our method is an attractive alternative to study mitochondrial dynamics, connecting behavior and function in a simpler and more robust way than traditional fluorescence imaging.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Number of references:45
Main heading:Mitochondria
Controlled terms:Cell culture - Cell proliferation - Dynamics - Fluorescence imaging - Photobleaching
Uncontrolled terms:Fluorescence labeling - High specificity - Monitoring and analysis - Morphological analysis - Multiple systems - Network dynamics - Phase-contrast microscopy - Three-dimensional information
Classification code:461.2 Biological Materials and Tissue Engineering - 461.9 Biology - 801 Chemistry
DOI:10.1364/BOE.425848
Funding details: Number: 202003a07020020, Acronym: -, Sponsor: -;Number: 2017YFA0505300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding. National Key Research and Development Program of China (2017YFA0505300); Anhui Province Key R & D Project (202003a07020020).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20213610849496
Title:Characteristics of nonlinear terahertz-wave radiation generated by mid-infrared femtosecond pulse laser excitation
Authors:Shibuya, Kyuki (1, 2, 3); Nawata, Kouji (3); Nakajima, Yoshiaki (2, 4); Fu, Yuxi (5, 6); Takahashi, Eiji J. (5); Midorikawa, Katsumi (5); Yasui, Takeshi (2, 7); Minamide, Hiroaki (3)
Author affiliation:(1) Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Japan; (2) JST, ERATO MINOSHIMA Intelligent Optical Synthesizer (IOS) Project, Japan; (3) Tera-Photonics Research Team, RIKEN Center for Advanced Photonics, RIKEN, Japan; (4) Department of Physics, Faculty of Sciences, Toho University, Japan; (5) Attosecond Science Research Team, RIKEN Center for Advanced Photonics, RIKEN, Japan; (6) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (7) Institute of Post-LED Photonics (PLED), Tokushima University, Japan
Corresponding author:Shibuya, Kyuki(shibuya.tokudai@gmail.com)
Source title:Applied Physics Express
Abbreviated source title:Appl. Phys. Express
Volume:14
Issue:9
Issue date:September 2021
Publication year:2021
Article number:092004
Language:English
ISSN:18820778
E-ISSN:18820786
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

We report on efficient terahertz-wave generation in organic and inorganic crystals by nonlinear wavelength conversion approach using a 3.3 μm femtosecond pulse laser. Experimental results reveal the relation between pump power and terahertz-wave output power, which is proportional to the square of the pump power at the range of mega- to tera-watt cm-2 class even if the pump wavelength is different. Damage threshold of organic and inorganic crystals are recorded 0.6 and 18 tera-watt cm-2 by reducing several undesirable nonlinear optical effects using mid-infrared source.
© 2021 The Japan Society of Applied Physics.
Number of references:32
Main heading:Terahertz waves
Controlled terms:Crystals - Electromagnetic pulse - Femtosecond lasers - Infrared devices - Laser excitation - Nonlinear optics - Organic lasers
Uncontrolled terms:Damage threshold - Femtosecond pulse laser - Inorganic crystals - Mid-infrared sources - Nonlinear optical effects - Pump wavelength - Terahertz wave generation - Terahertz wave radiations
Classification code:701 Electricity and Magnetism - 711 Electromagnetic Waves - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.9 Laser Applications - 933.1 Crystalline Solids
Numerical data indexing:Size 3.30e-06m
DOI:10.35848/1882-0786/ac1a48

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210209745018
Title:Broadband terahertz wave generation from an epsilon-near-zero material????(Open Access)
Authors:Jia, Wenhe (1); Liu, Meng (2); Lu, Yongchang (2); Feng, Xi (2); Wang, Qingwei (2); Zhang, Xueqian (2); Ni, Yibo (1); Hu, Futai (1); Gong, Mali (1); Xu, Xinlong (3); Huang, Yuanyuan (3); Zhang, Weili (4); Yang, Yuanmu (1); Han, Jiaguang (2)
Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing; 100084, China; (2) Center for THz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin; 300072, China; (3) Shaanxi Joint Lab of Graphene, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon‐Technology, Northwest University, Xi’an; 710069, China; (4) School of Electrical and Computer Engineering, Oklahoma State University, Stillwater; OK; 74078, United States
Corresponding author:Yang, Yuanmu(ymyang@tsinghua.edu.cnemailjiaghan@tju.edu.cn)Han, Jiaguang(jiaghan@tju.edu.cn)
Source title:Light: Science and Applications
Abbreviated source title:Light Sci. Appl.
Volume:10
Issue:1
Issue date:December 2021
Publication year:2021
Article number:11
Language:English
ISSN:20955545
E-ISSN:20477538
Document type:Journal article (JA)
Publisher:Springer Nature
Abstract:Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses are generated by optical rectification in bulk nonlinear crystals with millimetre thickness, with the bandwidth limited by the phase-matching condition. Here we demonstrate broadband THz emission via surface optical rectification from a simple, commercially available 19 nm-thick indium tin oxide (ITO) thin film. We show an enhancement of the generated THz signal when the pump laser is tuned around the epsilon-near-zero (ENZ) region of ITO due to the pump laser field enhancement associated with the ENZ effect. The bandwidth of the THz signal generated from the ITO film can be over 3 THz, unrestricted by the phase-matching condition. This work offers a new possibility for broadband THz generation in a subwavelength thin film made of an ENZ material, with emerging physics not found in existing nonlinear crystals.
© 2021, The Author(s).
Number of references:49
Main heading:Terahertz waves
Controlled terms:Bandwidth - Crystals - Indium compounds - Nonlinear optics - Phase matching - Pumping (laser) - Terahertz spectroscopy - Thin films - Tin oxides
Uncontrolled terms:Bandwidth limiteds - Broadband Light Sources - Broadband terahertz - Indium tin oxide thin films - Non-invasive imaging - Optical rectifications - Phase matching conditions - Terahertz spectral range
Classification code:711 Electromagnetic Waves - 713 Electronic Circuits - 716.1 Information Theory and Signal Processing - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 804.2 Inorganic Compounds - 931.1 Mechanics - 933.1 Crystalline Solids
Numerical data indexing:Frequency 3.00e+12Hz
DOI:10.1038/s41377-020-00452-y
Funding details: Number: 11774288,61975251, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 61735012,61875150, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFA0701004, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:This work was supported by the National Key Research and Development Program of China (Grant number 2017YFA0701004) and the National Natural Science Foundation of China (Grant numbers 61975251, 61875150, 61735012, and 11774288).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20210509858777
Title:Optical Waveguide Color Tuning by Fluorescence–Phosphorescence Dual Emission and Disparity of Optical Losses
Authors:Wang, Zheng (1, 2); Mo, Jun-Ting (1); Chen, Ling (3); Zhu, Cheng-Yi (1); Zhang, Qiang-Sheng (1); Yu, Yong-Qin (4); Pan, Mei (1)
Author affiliation:(1) MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou; 510275, China; (2) College of Chemistry and Chemical Engineering, Key Laboratory of Chemical Additives for China National Light Industry, Shaanxi University of Science and Technology, Xi'an; 710021, China; (3) School of Biotechnology and Health Science, Wuyi University, Jiangmen; 529000, China; (4) Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen Technology University, Shenzhen; 518060, China
Corresponding author:Pan, Mei(panm@mail.sysu.edu.cn)
Source title:Advanced Optical Materials
Abbreviated source title:Adv. Opt. Mater.
Volume:9
Issue:7
Issue date:April 6, 2021
Publication year:2021
Article number:2001591
Language:English
E-ISSN:21951071
Document type:Journal article (JA)
Publisher:John Wiley and Sons Inc
Abstract:

Organic photonic materials have high refractive index, fast transfer speed, low heat generation, and so on; and therefore, have great potential in optoelectronics and optical micro/nanocircuits. Herein, a new strategy using fluorescence–phosphorescence dual emission and disparity of optical loss in a smooth needle-like organic crystal is reported to realize color tuning of the optical waveguide (OWG). Especially, a warm white-light OWG emission is achieved by appropriately adjusting the excitation position, presenting the first report of single-component organic waveguide with white light emission. Based on this, the as-prepared 1D organic crystal has been demonstrated as a microscale optical correspondence device with multiple input and output responses, which offers potential applications in modern optics and photonics fields.
© 2021 Wiley-VCH GmbH
Number of references:36
Main heading:Optical waveguides
Controlled terms:Crystals - Fluorescence - Light - Phosphorescence - Refractive index
Uncontrolled terms:Excitation position - High refractive index - Multiple inputs - Organic crystal - Organic photonics - Organic waveguides - Single components - White light emission
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 933.1 Crystalline Solids
DOI:10.1002/adom.202001591
Funding details: Number: 2017BT01C161, Acronym: -, Sponsor: Guangdong Provincial Pearl River Talents Program;Number: 21720102007,21771197,21821003, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20200109144012410, Acronym: -, Sponsor: Science and Technology Planning Project of Shenzhen Municipality;
Funding text:Z.W. and J.‐T.M. contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (21771197, 21821003, 21720102007), Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01C161), Shenzhen Science and Technology Project under Grants No. JCYJ20200109144012410, and FRF for the Central Universities.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010348763
Title:Gradient rhenium doping enabled tunable anisotropic valleytronic material based on monolayer molybdenum disulfide
Authors:Ma, Xinli (1); Zhang, Jing (1); Lai, Jiawei (2); Zhang, Mingwen (3); Zheng, Jingchuan (4); Wu, Sen (1); Hu, Xiaodong (1); Wang, Qinsheng (4); Gan, Xuetao (3); Sun, Dong (2); Liu, Jing (1)
Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, NO. 92 Weijin Road, Tianjin; 300072, China; (2) International Center for Quantum Materials, School of Physics, Peking University, Beijing; 100871, China; (3) MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an; 710072, China; (4) Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing; 100081, China
Corresponding author:Liu, Jing(jingliu_1112@tju.edu.cn)
Source title:2D Materials
Abbreviated source title:2D Materials
Volume:8
Issue:3
Issue date:July 2021
Publication year:2021
Article number:035031
Language:English
E-ISSN:20531583
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

Two-dimensional molybdenum disulfide (MoS2) possesses premium electrical, optoelectrical and valleytronic properties to develop future nano-electronic and optoelectronic devices. Valleytronic material platform with anisotropic response is highly desired to develop polarization sensitive valleytronic devices. In this work, we acquire monolayer MoS2 with both valley degree of freedom and anisotropy by introducing Re doping during chemical vapor deposition growth. The atomic substitution with Re element induces prominent n-type doping. Electrical tests under both dark and light illumination show that 5 at% Re-doped MoS2 achieves the optimum electrical and optoelectrical performances, corresponding to 27 and 35 times improved carrier mobility and photoresponsivity than pristine MoS2, respectively. Second harmonic generation (SHG) and polarization Raman spectroscopy (PRS) indicate increased anisotropic optical response of Re doped MoS2 as Re concentration increases: Maximum anisotropic ratios of 1.6 and 1.7 have been achieved for SHG and PRS measurements at different doping concentrations, respectively. Circularly polarized PL measurement demonstrates that the Re-doped MoS2 preserves valley dependent optical response. Our theoretical calculations show that the anisotropic response is due to the strain induced by the dopants, so that the 2H lattice structure optical helicity dependent valley selection rules are largely preserved. The work opens promising venue toward polarization sensitive valleytronic material platform.
© 2021 IOP Publishing Ltd.
Number of references:52
Main heading:Molybdenum compounds
Controlled terms:Anisotropy - Chemical vapor deposition - Degrees of freedom (mechanics) - Hall mobility - Harmonic generation - Hole mobility - Landforms - Layered semiconductors - Monolayers - Nanoelectronics - Nonlinear optics - Optical lattices - Optoelectronic devices - Polarization - Rhenium - Sulfur compounds
Uncontrolled terms:Anisotropic response - Atomic substitutions - Circularly polarized - Doping concentration - Light illumination - Molybdenum disulfide - Polarization sensitive - Theoretical calculations
Classification code:481.1 Geology - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 712.1 Semiconducting Materials - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 761 Nanotechnology - 802.2 Chemical Reactions - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 933.3 Electronic Structure of Solids
DOI:10.1088/2053-1583/abf762

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211010020180
Title:An Enhanced Tilted-Angle Acoustofluidic Chip for Cancer Cell Manipulation????(Open Access)
Authors:Wu, Fangda (1); Shen, Ming Hong (2); Yang, Jian (3); Wang, Hanlin (4); Mikhaylov, Roman (5); Clayton, Aled (6); Qin, Xinghua (7); Sun, Chao (8); Xie, Zhihua (9); Cai, Meng (1); Wei, Jun (1); Liang, Dongfang (2); Yuan, Fan (3); Wu, Zhenlin (4); Fu, Yongqing (5); Yang, Zhiyong (6); Sun, Xianfang (7); Tian, Liangfei (8); Yang, Xin (1)
Author affiliation:(1) Department of Electrical and Electronic Engineering, School of Engineering, Cardiff University, Cardiff, United Kingdom; (2) Division of Cancer and Genetics, Preclinical Studies of Renal Tumours Group, School of Medicine, Cardiff University, Cardiff, United Kingdom; (3) School of Life Sciences, Northwestern Polytechnical University, Xi'an, China; (4) IRegene Therapeutics Company Ltd., Wuhan, China; (5) Department of Biomedical Engineering, School of Engineering, Duke University, Durham; NC, United States; (6) School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China; (7) Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, United Kingdom; (8) School of Mechanical Engineering, Tianjin University, Tianjin, China; (9) College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China
Corresponding author:Yang, Xin(yangx26@cardiff.ac.uk)
Source title:IEEE Electron Device Letters
Abbreviated source title:IEEE Electron Device Lett
Volume:42
Issue:4
Issue date:April 2021
Publication year:2021
Pages:577-580
Article number:9363916
Language:English
ISSN:07413106
E-ISSN:15580563
CODEN:EDLEDZ
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:In recent years, surface acoustic wave (SAW) devices have demonstrated great potentials and increasing applications in the manipulation of nano- and micro-particles including biological cells with the advantages of label-free, high sensitivity and accuracy. In this letter, we introduce a novel tilted-angle SAW devices to optimise the acoustic pressure inside a microchannel for cancer-cell manipulation. The SAW generation and acoustic radiation force are improved by seamlessly patterning electrodes in the space surrounding the microchannel. Comparisons between this novel SAW device and a conventional device show a 32% enhanced separation efficiency while the input power, manufacturing cost and fabrication effort remain the same. Effective separation of HeLa cancer cells from peripheral blood mononuclear cells is demonstrated. This novel SAW device has the advantages in minimizing device power consumption, lowering component footprint and increasing device density.
© 1980-2012 IEEE.
Number of references:19
Main heading:Molecular biology
Controlled terms:Acoustic surface wave devices - Acoustic waves - Diseases - Lanthanum compounds - Manufacture - Microchannels
Uncontrolled terms:Acoustic pressures - Acoustic radiation force - Biological cells - Manufacturing cost - Patterning electrodes - Peripheral blood mononuclear cells - Separation efficiency - Surface acoustic waves
Classification code:461.9 Biology - 537.1 Heat Treatment Processes - 751.1 Acoustic Waves - 752.1 Acoustic Devices
Numerical data indexing:Percentage 3.20e+01%
DOI:10.1109/LED.2021.3062292

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20210809954126
Title:Design of supercontinuum laser hyperspectral light detection and ranging (LiDAR) (SCLaHS LiDAR)
Authors:Zhou, Guoqing (1, 2, 3); Zhou, Xiang (1, 2, 3); Song, Youjian (4); Xie, Donghui (5); Wang, Long (6); Yan, Guangjian (5); Hu, Minglie (4); Liu, Bowen (4); Shang, Weidong (7); Gong, Chenghu (6); Wang, Cheng (8); Huang, Huaguo (9); Zhao, Yiqiang (1); Liu, Zhigang (5); Zhang, Guangyun (2); Wang, Xing (10); Nie, Sheng (8); Ye, Mao (1); Liu, Songlin (11); Tan, Qiaofeng (12); Li, Ke (13); Wei, Fengyuan (14); Su, Wei (15); Tian, Jinshou (16); Ai, Qingkang (16); Yang, Lvyun (17); Song, Bo (6); Xu, Jiasheng (6); Zhang, Lieping (6); Li, Wei (6); Wang, Ruirui (9); Xue, Hao (6); Dong, Hao (13); Yu, Ying (11); Wang, Hongtao (14)
Author affiliation:(1) School of Microelectronics, Tianjin University, Tianjin, China; (2) The Center of Remote Sensing, Tianjin University, Tianjin, China; (3) Guangxi Key Laboratory for Spatial Information and Geomatics, Guilin University of Technology, Guilin, China; (4) School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, China; (5) Institute of Remote Sensing Science and Engineering, Beijing Normal University, Beijing, China; (6) Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun, China; (7) Beijing Institute of Space Mechanics and Electricity, China Academy of Space Technology, Beijing, China; (8) Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China; (9) Department of Forestry, The College of Forestry of Beijing Forestry University, Beijing, China; (10) Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China; (11) School of Spatial Geographic Information, National Digital Switching System Engineering and Technology RD Center, Zhengzhou, China; (12) Department of Precision Instruments, Tsinghua University, Beijing, China; (13) Tianjin Jinhang Institute of Technology Physics, China Aerospace Science and Industry Co., Ltd, Tianjin, China; (14) School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, China; (15) College of Land Science and Technology, China Agricultural University, Beijing, China; (16) Department of Product Research and Development, Beijing Laize Photoelectric Technology Co, Beijing, China; (17) Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
Corresponding author:Zhou, Guoqing(1227416902@qq.com)
Source title:International Journal of Remote Sensing
Abbreviated source title:Int. J. Remote Sens.
Volume:42
Issue:10
Issue date:2021
Publication year:2021
Pages:3731-3755
Language:English
ISSN:01431161
E-ISSN:13665901
CODEN:IJSEDK
Document type:Journal article (JA)
Publisher:Taylor and Francis Ltd.
Abstract:Traditional Light Detection and Rangings (LiDARs) can quickly collect high-accuracy of three-dimensional (3D) point cloud data at a designated wavelength (i.e., cannot obtain hyperspectral data), while the passive hyperspectral imager can collect rich spectral data of ground objects, but are lack of 3D spatial data. This paper presents one innovative study on the design of airborne-oriented supercontinuum laser hyperspectral (SCLaHS) LiDAR with 50 bands covering 400 nm to 900 nm at a spectral resolution of 10 nm and ground sampling distance (GSD) of 0.5 m. The major innovations include (1) development of the high-power narrow-pulse supercontinuum laser source covering 400 nm to 900 nm with 50 bands using multi-core microstructure fibre, all-polarization maintaining fibre and ultra-long cavity structure, (2) a miniaturized aberration correction holographic concave grating spectroscopic and streak tube technique are developed for 50 bands laser echoes detection at high spectral-spatial-temporal resolution and dynamic airborne platform, and (3) the algorithm theoretic basis for SCLaHS LiDAR point cloud data 3D geodetic coordination calculation, including in-flight airborne calibration algorithm. The initial experimental results demonstrated that the designed SCLaHS LiDAR is doable, and a prototype of the (SCLaHS) LiDAR intends to be implemented.
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
Number of references:42
Main heading:Optical radar
Controlled terms:Aircraft detection - Polarization-maintaining fiber - Spectroscopy
Uncontrolled terms:Aberration correction - Calibration algorithm - Ground sampling distances - Hyperspectral imagers - Lidar point cloud datum - Light detection and ranging - Supercontinuum laser - Threedimensional (3-d)
Classification code:716.2 Radar Systems and Equipment - 741.1.2 Fiber Optics
Numerical data indexing:Size 5.00e-01m
DOI:10.1080/01431161.2021.1880662
Funding details: Number: GuikeAA18118038,GuikeAA18242048, Acronym: -, Sponsor: -;Number: 2019GXNSFGA245001, Acronym: -, Sponsor: -;Number: AD19254002, Acronym: -, Sponsor: -;Number: 20190210-2, Acronym: -, Sponsor: -;Number: 41961065, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This paper is financially supported by the National Natural Science of China (the grant #: 41961065), Guangxi Science and Technology Base and Talent Project (the grant #: Guike AD19254002); the Guangxi Innovative Development Grand Program (the grant #: GuikeAA18118038 and GuikeAA18242048); Guangxi Natural Science Foundation for Innovation Research Team (the grant #: 2019GXNSFGA245001), Guilin Research and Development Plan Program (the grant #: 20190210-2), and the BaGuiScholars program of Guangxi.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810622827
Title:An improved fusion method of infrared and visible images based on fusionGAN
Authors:Yao, Zhiqiang (1, 2); Guo, Huinan (2); Ren, Long (2)
Author affiliation:(1) University of Chinese Academy of Sciences, Yuquan Road, No.19, Shijingshan District, Beijing; 100049, China; (2) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xinxi Road, No.17, Gaoxin District, Shaanxi, Xi’an; 710119, China
Corresponding author:Guo, Huinan(guohuinan163@163.com)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11878
Part number:1 of 1
Issue title:Thirteenth International Conference on Digital Image Processing, ICDIP 2021
Issue date:2021
Publication year:2021
Article number:118781H
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510646001
Document type:Conference article (CA)
Conference name:13th International Conference on Digital Image Processing, ICDIP 2021
Conference date:May 20, 2021 - May 23, 2021
Conference location:Singapore, Singapore
Conference code:169927
Sponsor:International Association of Computer Science and Information Technology
Publisher:SPIE
Abstract:

Convolutional neural network is widely used in image fusion. However, the deep learning framework is only applied in some part of the fusion process in most existing methods. To generate a full end-to-end image fusion pipeline, a Y-shaped Generator model based on Generative Adversarial Network for infrared and visible image fusion is proposed. The idea of this method is to establish an adversarial game between the generator and the discriminator. The generator consisting of two Pyramid networks and three convolutional layers works as an autoencoder to improve the characteristic information of the fused images. As for the discriminator, it adopts a network structure similar to the Visual Geometry Group (VGG) network. The loss function uses the ratio loss to control the trade-off among generation loss and reconstruction loss. Results on publicly available datasets demonstrate that our method can improve the quality of detail information and sharpen the edge of infrared targets.
© 2021 SPIE
Number of references:21
Main heading:Image enhancement
Controlled terms:Convolution - Convolutional neural networks - Deep learning - Economic and social effects - Image fusion - Learning systems
Uncontrolled terms:Adversarial networks - Fusion methods - Generator modeling - Infrared and visible image - Infrared target - Learning frameworks - Network structures - Pyramid network
Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 971 Social Sciences
DOI:10.1117/12.2599559

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20200107963384
Title:Distribution equalization learning mechanism for road crack detection
Authors:Fang, Jie (1, 2); Qu, Bo (1); Yuan, Yuan (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China
Corresponding author:Fang, Jie(jackfang713508@gmail.com)
Source title:Neurocomputing
Abbreviated source title:Neurocomputing
Volume:424
Issue date:February 1, 2021
Publication year:2021
Pages:193-204
Language:English
ISSN:09252312
E-ISSN:18728286
CODEN:NRCGEO
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:Visual-based road crack detection becomes a hot research topic over the last decade because of its huge application demands. Road crack detection is actually a special form of salient object detection task, whose objects are small and distribute randomly in the image compared to the traditional ones, which increase the difficulty of detecting. Most conventional methods utilize bottom information, such as color, texture, and contrast, to extract the crack regions in the image. Even though these methods can achieve satisfactory performances for images with simple scenarios, they are easily interfered by some factors such as light and shadow, which may decrease the detection result directly. Inspired by the competitive performances of deep convolutional neural networks on many visual tasks, we propose a distribution equalization learning mechanism for road crack detection in this paper. Firstly, we consider the crack detection task as a pixel-level classification and use a U-Net based architecture to finalize it. Secondly, the occurrence probability of crack and non-crack are so different, which results in the ill-conditioned classifier and undesirable detection performance, especially the high false detection rate. In this case, we propose a weighted cross entropy loss term and a data augmentation strategy to avoid influence from imbalanced samples through emphasizing the crack regions. Additionally, we propose an auxiliary interaction loss, and combine it with the popular self-attention strategy to alleviate the fracture situations through considering relationships among different local regions in the image. Finally, we tested the proposed method on three public and challenging datasets, and the experimental results demonstrate its effectiveness.
© 2019
Number of references:54
Main heading:Crack detection
Controlled terms:Convolutional neural networks - Deep neural networks - Equalizers - Object detection - Object recognition - Roads and streets - Textures - Vision
Uncontrolled terms:Competitive performance - Conventional methods - Detection performance - Hot research topics - Ill-conditioned - Learning mechanism - Occurrence probability - Salient object detection
Classification code:406.2 Roads and Streets - 713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers - 723.2 Data Processing and Image Processing
DOI:10.1016/j.neucom.2019.12.057
Funding details: Number: XAB2017B15, Acronym: -, Sponsor: -;Number: 61632018, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61806193, Acronym: -, Sponsor: -;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: QYZDB-SSW-JSC015, Acronym: -, Sponsor: Chinese Academy of Sciences Key Technology Talent Program;Number: 61825603, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;
Funding text:This work was supported in part by the National Science Fund for Distinguished Young Scholars under Grant 61825603, in part by the State Key Program of National Natural Science Foundation of China under Grant 61632018 , in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61925112 , Grant 61806193 , and Grant 61772510 , in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grant XAB2017B15. Jie Fang Received B.S. degree in school of electronic engineering from XiDian University, Xi’an 710126, Shaanxi, P. R. China in 2015. He is currently pursuing the Ph.D degree in signal and information processing techniques with the Key Laboratory of Spectral Imaging Technology CAS, Xi,an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi,an 710119, Shaanxi, P. R. China and with the University of Chinese Academy of Sciences, Beijing 100049, P. R. China. His research interests include Artificial intelligence, Machine Learning and Image Understanding. Bo Qu is with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, Shaanxi, P. R. China. His research interests include Image Processing, Artificial Intelligence and Machine Learning. Yuan Yuan (M’05-SM’09) is currently a Full Professor with the Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi’an 710072, P. R. China. Her current research interests include Visual Information Processing and Image/Video Content Analysis.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20203909248807
Title:Local and correlation attention learning for subtle facial expression recognition
Authors:Wang, Shaocong (1, 2); Yuan, Yuan (3); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Center for OPTical IMagery Analysis and Learning(OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China
Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)
Source title:Neurocomputing
Abbreviated source title:Neurocomputing
Volume:453
Issue date:September 17, 2021
Publication year:2021
Pages:742-753
Language:English
ISSN:09252312
E-ISSN:18728286
CODEN:NRCGEO
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Subtle facial expression recognition (SFER) aims to classify facial expressions with very low intensity into corresponding human emotions. Subtle facial expression can be regarded as a special kind of facial expression, whose facial muscle movements are more difficult to capture. In the last decade, various methods have been developed for common facial expression recognition (FER). However, most of them failed to automatically find the most discriminative parts of facial expression and the correlation of muscle movements when human makes facial expression, which makes them unsuitable for SFER. To better solve SFER problem, an attention mechanism based model focusing on salient local regions and their correlations is proposed in this paper. The proposed method: 1) utilizes multiple attention blocks to attend to distinct discriminative regions and extract corresponding local features automatically, 2) a correlation attention module is integrated in the model to extract global correlation feature over the salient regions, and finally 3) fuses the correlation feature and local features in an efficient way for the final facial expression classification. By this way, the useful but subtle local information can be utilized in more detail, and the correlation of different local regions is also extracted. Extensive experiment on the LSEMSW and CK+ datasets shows that the method proposed in this paper achieves superior results, which demonstrates its effectiveness.
© 2020 Elsevier B.V.
Number of references:52
Main heading:Face recognition
Controlled terms:Muscle
Uncontrolled terms:Attention mechanisms - Correlation features - Facial expression classification - Facial expression recognition - Facial Expressions - Global correlation - Local information - Muscle movement
Classification code:461.2 Biological Materials and Tissue Engineering
DOI:10.1016/j.neucom.2020.07.120
Funding details: Number: 61632018,61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61825603,QYZDB-SSW-JSC015,XAB2017B15,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: -, Acronym: -, Sponsor: National Defense Science and Technology Innovation Fund of the Chinese Academy of Sciences;
Funding text:This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grant XAB2017B26, and Grant XAB2017B15, in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61825603, in part by the State Key Program of National Natural Science of China under Grant 61632018, in part by the National Defense Science and Technology Innovation Special Zone Project.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210309787605
Title:Numerical study of the influence of thermal radiation on measuring semi-transparent thermal insulation material with hot wire method
Authors:Zhang, H. (1); Ma, Y.X. (2); Wang, X. (1); Tang, G.H. (3)
Author affiliation:(1) State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an; 710049, China
Corresponding author:Zhang, H.(huzhang@xjtu.edu.cn)
Source title:International Communications in Heat and Mass Transfer
Abbreviated source title:Int. Commun. Heat Mass Transf.
Volume:121
Issue date:February 2021
Publication year:2021
Article number:105120
Language:English
ISSN:07351933
CODEN:IHMTDL
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:Semi-transparent thermal insulation material has very low extinction coefficient and will transmit infrared spectrum within some wavelength range. When measuring the thermal conductivity (TC) of such kinds of material with transient methods, both heat conduction and thermal radiation occur within material. Transient hot wire (HW) method is a widely used method for thermal insulation measurement. It is developed with the assumption that heat only transfers via conduction. Since thermal radiation within low density thermal insulation material is a pronounced heat transfer mode at high temperature, the TC of radiation participating medium measured by HW method might be incorrect. To reveal the inconsistency between test theory and practical heat transfer process when measuring semi-transparent thermal insulation material with HW method, the transient conduction and radiation coupled heat transfer process is simulated numerically. The uncertainty caused by thermal radiation is investigated for material with different extinction coefficient at various temperature. The deviation increases with the increment of temperature and decreases with increment of extinction coefficient compared to results obtained from the one dimensional (1D) steady state method. The numerical analysis indicates that the TC of thermal insulation material with low extinction ability measured by HW method is overestimated at high temperature.
© 2021 Elsevier Ltd
Number of references:27
Main heading:Thermal conductivity
Controlled terms:Heat conduction - Heat radiation - Heat transfer coefficients - Numerical methods - Radiation - Thermal insulating materials - Thermal insulation
Uncontrolled terms:Coupled heat transfer - Extinction coefficients - Heat transfer process - Participating medium - Steady-state method - Thermal insulation materials - Transient conduction - Transient hot wire
Classification code:413.2 Heat Insulating Materials - 641.1 Thermodynamics - 641.2 Heat Transfer - 921.6 Numerical Methods
DOI:10.1016/j.icheatmasstransfer.2021.105120
Funding details: Number: 51825604, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: xjj2018029, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work was supported by the Innovative Talents Support Plan of China Postdoctoral Foundation (No. BX20180244), National Natural Science Foundation of China (No. 51825604), China Postdoctoral Science Foundation Funded Project (No. 2018M643641), and the Fundamental Research Funds for the Central Universities, China (No. xjj2018029).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509874590
Title:Simulation of non-line-of-sight imaging system based on the light-cone transform
Authors:Zhu, Wenhua (1, 2); Tan, Jingjing (1, 2); Ma, Caiwen (1); Su, Xiuqin (1)
Author affiliation:(1) Cas Key Laboratory of Space Precision Measurement, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi'an, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing; 100049, China
Corresponding author:Su, Xiuqin(suxiuqin@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:1176121
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:Non-line-of-sight (NLOS) imaging is an emerging technique, which can observe objects obscured by occluders. Thanks to the improvement of optical configurations, it is receiving growing interest from researchers. In this paper, we reconstruct both 2D and 3D images by adopting the light-cone transform and validated on simulated data. Numerical results are evaluated by structural similarity index (SSIM). The results showed the good performance of the algorithm in preserving the details of 2D image and reconstruction of 3D image. The structural similarity index of the reconstructed image and the reference image is more than 50%, the target is hence being identified. This work contributes to the construction of the real system.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:20
Main heading:Image reconstruction
Controlled terms:Photonics
Uncontrolled terms:Non-line-of-sight imaging - Nonline of sight - Numerical results - Optical configurations - Reconstructed image - Reference image - Structural similarity indices - Structural similarity indices (SSIM)
Classification code:741.1 Light/Optics
Numerical data indexing:Percentage 5.00e+01%
DOI:10.1117/12.2586651

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211010034322
Title:Optical design and simulation of Einstein Probe satellite follow-up X-ray telescope
Authors:Zhu, Yuxuan (1); Lu, Jingbin (1); Yang, Yangji (2); Cong, Min (2); Sheng, Lizhi (3); Qiang, Pengfei (3); Cui, Weiwei (2); Zhang, Ziliang (2); Wang, Yusa (2); Han, Dawei (2); Li, Wei (2); Wang, Juan (2); Huo, Jia (2); Li, Maoshun (2); Zhao, Xiaofan (2); Yu, Nian (2); Song, Zeyu (2); Ma, Jia (2); Lv, Zhonghua (2); Zhao, Zijian (2); Wang, Hao (2); Hou, Dongjie (2); Chen, Can (2); Chen, Tianxiang (2); Yang, Xiongtao (2); Luo, Laidan (2); Lu, Bing (2); Xu, Jingjing (2); Chen, Yehai (4); Chen, Yong (2)
Author affiliation:(1) Jilin University, College of Physics, Changchun, Jilin, China; (2) Chinese Academy of Sciences, Institute of High Energy Physics, Key Laboratory of Particle Astrophysics, Beijing, China; (3) Xi'an Institute of Optics and Precision Mechanics, State Key Laboratory of Transient Optics and Photonics, Xi'an, China; (4) Chinese Academy of Sciences, Innovation Academy for Microsatellites, Shanghai, China
Source title:Optical Engineering
Abbreviated source title:Opt Eng
Volume:60
Issue:2
Issue date:February 1, 2021
Publication year:2021
Article number:025102
Language:English
ISSN:00913286
E-ISSN:15602303
CODEN:OPEGAR
Document type:Journal article (JA)
Publisher:SPIE
Abstract:The Follow-up X-ray Telescope (FXT), a key payload onboard the Einstein Probe sallite (EP), is equipped with a Wolter-I X-ray focusing mirror system. We introduce the principle of such a mirror system and analyze the influence of the mirror gap in the multishell nested mirror of the FXT on the effective area, stray-light ratio, and vignetting. To ensure that no occlusion occurs within adjacent shells and minimize stray-light ratio, the size of the gap is set to a optimized value for corresponding shell. We finished a design of a 54-shell mirror system according to these results. The optical performance of the design was then simulated using a Monte Carlo algorithm and the ray-tracing principle. The simulation shows that the effective area is 414.5 ± 0.2 cm2 at 1.25 keV (considering the spider), and the field of view is 64 arcmin in diameter. These parameters meet the optical requirements of the FXT.
© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE).
Number of references:26
Main heading:X rays
Controlled terms:Mirrors - Optical design - Probes - Spacecraft equipment - Stray light - Telescopes
Uncontrolled terms:Design and simulation - Field of views - Mirror systems - Monte carlo algorithms - Optical performance - Tracing principle - X ray telescope - X-ray focusing mirror
Classification code:655.1 Spacecraft, General - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 932.1 High Energy Physics
Numerical data indexing:Electron_Volt 1.25e+03eV
DOI:10.1117/1.OE.60.2.025102

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20205209674760
Title:Precise on-Fiber Plasmonic Spectroscopy Using a Gradient-Index Microlens
Authors:Jia, Peipei (1, 5); Kong, Depeng (2); Li, Jiawen (3); Schartner, Erik (4); Ebendorff-Heidepriem, Heike (4)
Author affiliation:(1) ARC Centre of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, School of Physical Sciences, The University of Adelaide, Adelaide, Australia; (2) Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS (XIOPM), Shannxi, China; (3) CNBP, IPAS, Adelaide Medical School, The University of Adelaide, Adelaide, Australia; (4) CNBP, IPAS, School of Physical Sciences, The University of Adelaide, Adelaide, Australia; (5) Shenzhen Topmembrane Technology Co., Ltd., Shenzhen; 518000, China
Corresponding author:Kong, Depeng(kongdp@opt.ac.cn)
Source title:Journal of Lightwave Technology
Abbreviated source title:J Lightwave Technol
Volume:39
Issue:1
Issue date:January 1, 2021
Publication year:2021
Pages:270-274
Article number:9205196
Language:English
ISSN:07338724
E-ISSN:15582213
CODEN:JLTEDG
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Plasmonic spectroscopy has emerged as a powerful technique for interrogation of light in the subwavelength regime. Realization of active plasmonic elements on optical fibers can simplify the optical design, allow for performing remote tasks and thus extend the scope of plasmonic utilization. However, the optimization of fiber optics for improving the plasmonic excitation condition has been overlooked. Here we present a plasmonic spectroscopy platform that combines a gradient-index microlens and a single-mode optical fiber. This design ensures large-area and uniform illumination in normal incidence for the excitation of surface plasmon resonance. We demonstrate precise plasmonic spectroscopy with a fiber-optic platform by patterning a nanohole array onto the facet of a gradient-index microlens with our template transfer technique. The experimental spectra are almost identical to the simulated results under ideal conditions, with accurate resonance wavelength (<10 nm deviation), high sensitivity (5 nm/RIU deviation), narrow linewidth (about 5 nm deviation), and diverse shifting patterns. This platform provides a fiber-optic avenue of precise plasmonic spectroscopy for remote interrogation.
© 1983-2012 IEEE.
Number of references:22
Main heading:Fiber optics
Controlled terms:Microlenses - Optical design - Optical fibers - Plasmons - Surface plasmon resonance
Uncontrolled terms:Excitation conditions - Experimental spectra - Narrow-line width - Resonance wavelengths - Shifting patterns - Single-mode optical fiber - Transfer technique - Uniform illumination
Classification code:741 Light, Optics and Optical Devices - 931.3 Atomic and Molecular Physics
Numerical data indexing:Size 5.00e-09m
DOI:10.1109/JLT.2020.3026365
Funding details: Number: CE14010003, Acronym: CNBP, Sponsor: ARC Centre for Nanoscale BioPhotonics;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 1020, Acronym: -, Sponsor: -;
Funding text:This work research was supported by the ARC Centre of Excellence for Nanoscale BioPhotonics under Grant CE14010003 and CAS Scholarship. The work of J. Li was supported by the National Heart Foundation Postdoctoral Fellowship under Grant 1020

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211510186719
Title:Offline Signature Authentication Algorithm Based on the Fuzzy Set????(Open Access)
Authors:Qiu, Shi (1); Fei, Fengchang (2); Cui, Ying (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) College of Modern Economics and Management, Jiangxi University of Finance and Economic, Nanchang; 330077, China; (3) College of Equipment Management and Support, Engineering University of PAP, Xi'an; 710086, China
Corresponding author:Fei, Fengchang(ffcbox@163.com)
Source title:Mathematical Problems in Engineering
Abbreviated source title:Math. Probl. Eng.
Volume:2021
Issue date:2021
Publication year:2021
Article number:5554341
Language:English
ISSN:1024123X
E-ISSN:15635147
Document type:Journal article (JA)
Publisher:Hindawi Limited
Abstract:

There exists a problem that it is difficult to identify the authenticity of offline signatures. Firstly, a segmentation model is established based on the theory of fuzzy sets to extract signatures completely. Secondly, statistical shape model (SSM) and variance distance discretization of intraclass signatures are introduced for stability analysis and quantification. Finally, multilayer classifiers are constructed to realize signature authentication. The algorithm has low false detection rate and short authentication time.
© 2021 Shi Qiu et al.
Number of references:34
Main heading:Authentication
Controlled terms:Fuzzy sets
Uncontrolled terms:Authentication time - Offline signatures - Segmentation models - Signature authentication - Stability analysis - Statistical shape model - Theory of fuzzy sets - Variance distances
Classification code:723 Computer Software, Data Handling and Applications
DOI:10.1155/2021/5554341

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20210909996869
Title:Human behaviour recognition with mid-level representations for crowd understanding and analysis????(Open Access)
Authors:Sun, Bangyong (1, 2); Yuan, Nianzeng (1); Li, Shuying (4); Wu, Siyuan (2); Wang, Nan (2, 3)
Author affiliation:(1) College of Printing, Packaging Engineering and Digital Media, Xi'an University of Technology, Xi'an; Shaanxi; 710048, China; (2) The Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (3) University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing; 100049, China; (4) School of Automation, Xi'an University of Posts & Telecommunications, Xi'an; Shaanxi; 710121, China
Corresponding author:Wu, Siyuan(wusiyuan@opt.ac.cnemailangle_lisy@163.com)Li, Shuying(angle_lisy@163.com)
Source title:IET Image Processing
Abbreviated source title:IET Image Proc.
Issue date:2021
Publication year:2021
Language:English
ISSN:17519659
Document type:Article in Press
Publisher:John Wiley and Sons Inc
Abstract:Crowd understanding and analysis have received increasing attention for couples of decades, and development of human behaviour recognition strongly supports the application of crowd understanding and analysis. Human behaviour recognition usually seeks to automatically analyse ongoing movements and actions in different camera views by using various machine learning methodologies in unknown video clips or image sequences. Compared to other data modalities such as documents and images, processing video data demands much higher computational and storage resources. The idea of using middle level semantic concepts to represent human actions from videos is explored and it is argued that these semantic attributes enable the construction of more descriptive methods for human action recognition. The mid-level attributes, initialized by a cluster processing, are built upon low level features and fully utilize the discrepancies in different action classes, which can capture the importance of each attribute for each action class. In this way, the representation is constructed to be semantically rich and capable of highly discriminative performance even paired with simple linear classifiers. The method is verified on three challenging datasets (KTH, UCF50 and HMDB51), and the experimental results demonstrate that our method achieves better results than the baseline methods on human action recognition.
© 2021 The Authors. IET Image Processing published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology
Number of references:56
Main heading:Behavioral research
Controlled terms:Data handling - Digital storage - Semantics
Uncontrolled terms:Baseline methods - Human-action recognition - Linear classifiers - Low-level features - Mid-level representation - Semantic attribute - Semantic concept - Storage resources
Classification code:722.1 Data Storage, Equipment and Techniques - 723.2 Data Processing and Image Processing - 971 Social Sciences
DOI:10.1049/ipr2.12147
Funding details: Number: LSIT201801D, Acronym: -, Sponsor: -;Number: 2017YFB0502900, Acronym: -, Sponsor: -;Number: 62076199, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61701387,61806193,XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019M653784,61702498, Acronym: -, Sponsor: China Postdoctoral Science Foundation;
Funding text:This work was supported in part by National Natural Science Foundation of China under Grant 62076199, in part by the China Postdoctoral Science Foundation under Grant 2019M653784, in part by the National Natural Science Foundation of China under Grant 61702498, in part by the National Key R∖&D Program of China under Grant 2017YFB0502900, in part by the CAS Light of West China Program under Grant XAB2017B15, in part by the National Natural Science Foundation of China under Grant 61806193, in part by the National Natural Science Foundation of China under Grant 61701387, and in part by Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences under Grant LSIT201801D.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212210439340
Title:Tunable wettability pattern transfer photothermally achieved on zinc with microholes fabricated by femtosecond laser????(Open Access)
Authors:Li, Fengping (1, 2); Feng, Guang (2); Yang, Xiaojun (3); Lu, Chengji (2); Ma, Guang (2); Li, Xiaogang (2); Xue, Wei (2); Sun, Haoran (2)
Author affiliation:(1) School of Aerospace Engineering, Xiamen University, Xiamen; 361005, China; (2) Zhejiang Provincial Engineering Lab of Laser and Optoelectronic Intelligent Manufacturing, Wenzhou University, Wenzhou; 325035, China; (3) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China
Corresponding author:Li, Fengping(lfp@wzu.edu.cn)
Source title:Micromachines
Abbreviated source title:Micromachines
Volume:12
Issue:5
Issue date:2021
Publication year:2021
Article number:547
Language:English
E-ISSN:2072666X
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

A quickly tunable wettability pattern plays an important role in regulating the surface behavior of liquids. Light irradiation can effectively control the pattern to achieve a specific wettability pattern on the photoresponsive material. However, metal oxide materials based on light adjustable wettability have a low regulation efficiency. In this paper, zinc (Zn) superhydrophobic surfaces can be obtained by femtosecond-laser-ablated microholes. Owing to ultraviolet (UV) irradiation increasing the surface energy of Zn and heating water temperature decreasing the surface energy of water, the wettability of Zn can be quickly tuned photothermally. Then, the Zn superhydrophobic surfaces can be restored by heating in the dark. Moreover, by tuning the pattern of UV irradiation, a specific wettability pattern can be transferred by the Zn microholes, which has a potential application value in the field of new location-controlled micro-/nanofluidic devices, such as microreactors and lab-on-chip devices.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:31
Main heading:Femtosecond lasers
Controlled terms:Interfacial energy - Irradiation - Metals - Nanocomposites - Superhydrophobicity - Surface properties - Temperature - Wetting - Zinc
Uncontrolled terms:Lab-on-chip devices - Light irradiations - Location controlled - Metal oxide materials - Super-hydrophobic surfaces - Tunable wettabilities - Ultraviolet irradiations - Water temperatures
Classification code:546.3 Zinc and Alloys - 641.1 Thermodynamics - 761 Nanotechnology - 933 Solid State Physics - 951 Materials Science
DOI:10.3390/mi12050547
Funding details: Number: ZG2019031, Acronym: -, Sponsor: -;Number: 2018YFB1108000, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding: This research was funded by the Laser Manufacturing and Additive Manufacturing Project of the National Key Research and Development Program of China (2018YFB1108000); Wenzhou Municipal Key Science and Research Program (ZG2019031).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20212010365541
Title:Structure-Preserving Super-Resolution Reconstruction Based on Multi-residual Network
Title of translation:基于多残差网络的结构保持超分辨重建
Authors:Zhang, Mingjin (1, 2); Peng, Xiaoqi (1); Guo, Jie (1); Li, Yunsong (1); Wang, Nannan (1); Gao, Xinbo (1, 3)
Author affiliation:(1) State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an; 710071, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Chongqing Key Laboratory of Image Cognition, Chongqing University of Posts and Telecommunications, Chongqing; 400065, China
Corresponding author:Gao, Xinbo(gaoxb@cqupt.edu.cn)
Source title:Moshi Shibie yu Rengong Zhineng/Pattern Recognition and Artificial Intelligence
Abbreviated source title:Moshi Shibie yu Rengong Zhineng
Volume:34
Issue:3
Issue date:March 2021
Publication year:2021
Pages:232-240
Language:Chinese
ISSN:10036059
CODEN:MRZHET
Document type:Journal article (JA)
Publisher:Science Press
Abstract:

Aiming at the problems of geometric structure distortion and missing details in image super-resolution reconstruction, a structure-preserving super-resolution reconstruction algorithm based on multi-residual network is proposed. Deep learning is carried out in the wavelet transform domain and the gradient domain. Three kinds of residual networks are introduced. The structure and the edge information are reconstructed by the residual gradient network. The high-frequency information of the image is reconstructed as a whole by the residual wavelet transform network. The network attention is adjusted by the residual channel attention network, the important channel features are emphatically learned, and the high frequency information of the image is recovered locally. Experiments show that the proposed algorithm achieves better performance in both quantitative results and visual effects.
© 2021, Science Press. All right reserved.
Number of references:31
Main heading:Image reconstruction
Controlled terms:Deep learning - Optical resolving power - Wavelet transforms
Uncontrolled terms:Geometric structure - High-frequency informations - Image super-resolution reconstruction - Quantitative result - Residual gradient - Structure-preserving - Super resolution reconstruction - Wavelet-transform domain
Classification code:741.1 Light/Optics - 921.3 Mathematical Transformations
DOI:10.16451/j.cnki.issn1003-6059.202103005
Funding details: Number: 61902293, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XJS200112, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:Supported by Youth Fund of National Natural Science Foundation of China(No.61902293), Young Talent Fund of University Association for Science and Technology in Shaanxi(No.20200103), Open Research Fund of CAS Key Laboratory of Spectral Imaging Technology(No.LSIT201901W), Fundamental Research Funds for the Central Universities(No.XJS200112).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211610229638
Title:Modified scaling angular spectrum method for numerical simulation in long-distance propagation
Authors:Chen, Xiao-Yi (1, 2); Duan, Ya-Xuan (1); Xiang, Bin-Bin (3); Li, Ming (1); Da, Zheng-Shang (1)
Author affiliation:(1) The Advanced Optical Instrument Research Department, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi; 830011, China
Corresponding author:Duan, Ya-Xuan(duanyaxuan@opt.ac.cn)
Source title:Chinese Physics B
Abbreviated source title:Chin. Phys.
Volume:30
Issue:3
Issue date:March 2021
Publication year:2021
Article number:034203
Language:English
ISSN:16741056
E-ISSN:20583834
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

The angular method (AS) cannot be used in long-distance propagation because it produces severe numerical errors due to the sampling problem in the transfer function. Two ways can solve this problem in AS for long-distance propagation. One is zero-padding to make sure that the calculation window is wide enough, but it leads to a huge calculation burden. The other is a method called band-limited angular spectrum (BLAS), in which the transfer function is truncated and results in that the calculation accuracy decreases as the propagation distance increases. In this paper, a new method called modified scaling angular spectrum (MSAS) to solve the problem for long-distance propagation is proposed. A scaling factor is introduced in MSAS so that the sampling interval of the input plane can be adjusted arbitrarily unlike AS whose sampling interval is restricted by the detector's pixel size. The sampling interval of the input plane is larger than the detector's pixel size so the size of calculation window suitable for long-distance field propagation in the input plane is smaller than the size of the calculation window required by the zero-padding. Therefore, the method reduces the calculation redundancy and improves the calculation speed. The results from simulations and experiments show that MSAS has a good signal-to-noise ratio (SNR), and the calculation accuracy of MSAS is better than BLAS.
© 2021 Chinese Physical Society and IOP Publishing Ltd
Number of references:30
Main heading:Signal to noise ratio
Controlled terms:Numerical methods - Pixels - Spectrum analysis - Transfer functions
Uncontrolled terms:Angular spectrum method - Calculation accuracy - Calculation speed - Long-distance propagation - Numerical errors - Propagation distances - Sampling interval - Sampling problems
Classification code:716.1 Information Theory and Signal Processing - 921 Mathematics - 921.6 Numerical Methods
DOI:10.1088/1674-1056/abd38d
Funding details: Number: 2020GY-114, Acronym: -, Sponsor: Key Technology Research and Development Program of Shandong;Number: 61705254, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Project supported by the National Natural Science Foundation of China (Grant No. 61705254) and the Key Research and Development Program of Shaanxi Province of China (Grant No. 2020GY-114).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213710891807
Title:A time-correlated single photon counting signal denoising method based on elastic variational mode extraction
Title of translation:基于弹性变分模态提取的时间相关单光子计数信号去噪
Authors:Wang, Shu-Chao (1, 2, 3); Su, Xiu-Qin (1, 3); Zhu, Wen-Hua (1, 2, 3); Chen, Song-Mao (1, 3); Zhang, Zhen-Yang (1, 2, 3); Xu, Wei-Hao (1, 2); Wang, Ding-Jie (1, 2)
Author affiliation:(1) Key Laboratory of Space Precision Measurement Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Pilot National Laboratory for Marine Science and Technology, Qingdao; 266237, China
Corresponding author:Su, Xiu-Qin(suxiuqin@opt.ac.cn)
Source title:Wuli Xuebao/Acta Physica Sinica
Abbreviated source title:Wuli Xuebao
Volume:70
Issue:17
Issue date:September 5, 2021
Publication year:2021
Article number:174304
Language:Chinese
ISSN:10003290
CODEN:WLHPAR
Document type:Journal article (JA)
Publisher:Institute of Physics, Chinese Academy of Sciences
Abstract:

The performance of the method of measuring the time-correlated single photon counting signal is the key to improving the ranging accuracy of single photon light detection and ranging (LiDAR) technique, where noise elimination is a critically essential step to obtain the characteristics of signal. In this paper, a new method called elastic variational mode extraction (EVME) is proposed to extract the feature of the reflected photons from noisy environment. The method takes into account the characteristic of photon counting signal, and improves variational mode decomposition (VMD) method by adopting a new assumption that the extractive mode signal should be compact around desired center frequency. The proposed method also uses the elastic net regularization to solve ill-posed problem instead of Tikhonov regularization mentioned in VMD. Elastic net regularization takes into account both L2-norm regularization and L1-norm regularization, which can add an extra analysis dimension compared with the Tikhonov regularization. The method is validated with real data which are acquired on condition that average transmitting power is 25 nW while the average background noise power is 19.51 μW. The root mean square error of the reconstruction accuracy reaches 1.414 ns. Furthermore, compared with VMD, Haar wavelet, Hibert envelope, empirical mode decomposition (EMD) and complete ensemble empirical mode decomposition method based on adaptive noise (CEEMDAN) under different conditions, the proposed method show fast and stable performance under an extreme case.
© 2021 Chinese Physical Society.
Number of references:25
Main heading:Correlation detectors
Controlled terms:Extraction - Mean square error - Optical radar - Particle beams - Photons - Signal denoising - Wavelet decomposition
Uncontrolled terms:Empirical Mode Decomposition - Ensemble empirical mode decomposition - Light detection and ranging techniques - Mode decomposition - Reconstruction accuracy - Root mean square errors - Tikhonov regularization - Time-correlated single photon counting
Classification code:716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 802.3 Chemical Operations - 921.3 Mathematical Transformations - 922.2 Mathematical Statistics - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics
Numerical data indexing:Power 1.95e-05W, Power 2.50e-08W, Time 1.41e-09s
DOI:10.7498/aps.70.20210149
Funding details: Number: 2020M683600, Acronym: -, Sponsor: China Postdoctoral Science Foundation;
Funding text:Project supported by the China Postdoctoral Science Foundation (Grant No. 2020M683600) and the Strategic High Technology Innovation Project of the Chinese Academy of Sciences (Grant No. GQRC-19-19).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810616400
Title:Design of secondary lens focusing mechanism for multispectral camera
Authors:Rui, Wang (1, 2); Xiuqin, Su (1, 3); Yongming, Qiao (1); Tao, Lv (1); Xuan, Wang (1, 2); Kaidi, Wang (1, 2); Yuan, Tian (1, 2)
Author affiliation:(1) Key Laboratory of Space Precision Measurement Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Pilot National Laboratory for Marine Science and Technology, Qingdao; 266237, China
Corresponding author:Rui, Wang(wangrui@opt.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11885
Part number:1 of 1
Issue title:International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021
Issue date:2021
Publication year:2021
Article number:1188512
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510646162
Document type:Conference article (CA)
Conference name:2021 International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021
Conference date:May 28, 2021 - May 30, 2021
Conference location:Xi'an, China
Conference code:169930
Sponsor:China Optoelectronics Industry Platform
Publisher:SPIE
Abstract:

Due to the influence of mechanical environment, large range temperature change and atmospheric pressure, the space multispectral camera has a certain amount of defocus in the optical imaging system. In order to improve the imaging quality of the multispectral camera, if the traditional CAM focusing mechanism is adopted, it is difficult to meet the requirements of high precision focusing for fast response due to its disadvantages such as large volume, poor efficiency and low precision. Therefore, a new focusing mechanism is designed in this paper, which is composed of rhomboid amplifier large piezoelectric ceramic actuator, flexible hinge support structure and high-precision capacitance sensor. The mechanism drives the flexible support guide structure of the parallelogram by means of a rhomboid amplifier large PZT actuator with three points distributed uniformly and symmetrically at 120°, so that the lens base can move in a straight line along the Z direction. The high precision capacitance sensor is used as the feedback element to ensure the focusing accuracy of the mechanism reaches nanometer level. The test results show that the focusing range of this mechanism is ±21.91um, the focusing speed is 438um/s, the focusing precision is 50nm and the tilt error is 1".
© 2021 SPIE
Number of references:13
Main heading:Focusing
Controlled terms:Actuators - Atmospheric pressure - Cameras - Capacitance - Piezoelectric ceramics
Uncontrolled terms:Focusing mechanisms - Mechanical environment - Multi-spectral cameras - Optical imaging system - Piezoelectric ceramic actuators - Poor efficiencies - Support structures - Temperature changes
Classification code:443.1 Atmospheric Properties - 701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 732.1 Control Equipment - 742.2 Photographic Equipment
Numerical data indexing:Size 5.00e-08m
DOI:10.1117/12.2602300

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810622274
Title:Flexible dynamic structural color based on an ultrathin asymmetric Fabry-Perot cavity with phase-change material for temperature perception????(Open Access)
Authors:ZHAO, JIANCUN (1, 2, 3); ZHOU, YI (4); HUO, YIHUI (5); GAO, BO (6); MA, YUNGUI (7); YU, YITING (8)
Author affiliation:(1) Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen; 518057, China; (2) College of Mechanical Engineering, Northwestern Polytechnical University, Xi'an; 710072, China; (3) Institute of Northwestern Polytechnical University, Ningbo; 315103, China; (4) Key Laboratory of Micro/Nano Systems for Aerospace (Ministry of Education), Northwestern Polytechnical University, Xi'an; 710072, China; (5) Shaanxi Province Key Laboratory of Micro and Nano Electro-Mechanical Systems, Northwestern Polytechnical University, Xi'an; 710072, China; (6) State Key Lab of Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou; 310058, China; (7) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China; (8) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:YU, YITING(yyt@nwpu.edu.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:15
Issue date:July 19, 2021
Publication year:2021
Pages:23273-23281
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Dynamic structural color has attracted considerable attentions due to its good tunable characteristics. Here, an ultrathin asymmetric Fabry-Perot (FP)-type structural color with phase-change material VO2 cavity is proposed. The color-switching performance can be realized by temperature regulation due to the reversible monoclinic-rutile phase transition of VO2. The various, vivid structural color can be generated by simply changing the thickness of VO2 and Ag layers. Moreover, the simple structural configuration enables a large-scale, low-cost preparation on both rigid and flexible substrates. Accordingly, a flexible dynamic structural color membrane is adhered on a cup with a curved surface to be used for temperature perception. The proposed dynamic structural color has potential applications in anti-counterfeiting, temperature perception, camouflage coatings among other flexible optoelectronic devices.
© 2021 Optical Society of America.
Number of references:30
Main heading:Color
Controlled terms:Camouflage - Fabry-Perot interferometers - Optoelectronic devices - Oxide minerals - Phase change materials - Titanium dioxide - Vanadium dioxide
Uncontrolled terms:Anti-counterfeiting - Asymmetric Fabry Perot - Asymmetric Fabry-Perot cavities - Camouflage coatings - Flexible dynamics - Rigid and flexible substrates - Structural configurations - Temperature regulations
Classification code:404.1 Military Engineering - 482.2 Minerals - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 804.2 Inorganic Compounds - 941.3 Optical Instruments
DOI:10.1364/OE.431906
Funding details: Number: 20JY031, Acronym: -, Sponsor: -;Number: 202003N4033, Acronym: -, Sponsor: Natural Science Foundation of Ningbo;Number: 51975483,61775195,62075196, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20180508151936092, Acronym: -, Sponsor: Science, Technology and Innovation Commission of Shenzhen Municipality;Number: 2020ZDLGY01-03, Acronym: -, Sponsor: Key Research and Development Projects of Shaanxi Province;
Funding text:Funding. Science, Technology and Innovation Commission of Shenzhen Municipality (JCYJ20180508151936092); National Natural Science Foundation of China (51975483, 61775195, 62075196); Natural Science Foundation of Ningbo (202003N4033); Key Research and Development Projects of Shaanxi Province (2020ZDLGY01-03); Collaborative Innovation Center Project of Shaanxi Provincial Department of Education (20JY031).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20210409831033
Title:Vision-to-Language Tasks Based on Attributes and Attention Mechanism????(Open Access)
Authors:Li, Xuelong (1); Yuan, Aihong (2, 3); Lu, Xiaoqiang (3)
Author affiliation:(1) School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi'an; 710072, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Cybernetics
Abbreviated source title:IEEE Trans. Cybern.
Volume:51
Issue:2
Issue date:February 2021
Publication year:2021
Pages:913-926
Article number:8718014
Language:English
ISSN:21682267
E-ISSN:21682275
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Vision-to-language tasks aim to integrate computer vision and natural language processing together, which has attracted the attention of many researchers. For typical approaches, they encode image into feature representations and decode it into natural language sentences. While they neglect high-level semantic concepts and subtle relationships between image regions and natural language elements. To make full use of these information, this paper attempt to exploit the text-guided attention and semantic-guided attention (SA) to find the more correlated spatial information and reduce the semantic gap between vision and language. Our method includes two-level attention networks. One is the text-guided attention network which is used to select the text-related regions. The other is SA network which is used to highlight the concept-related regions and the region-related concepts. At last, all these information are incorporated to generate captions or answers. Practically, image captioning and visual question answering experiments have been carried out, and the experimental results have shown the excellent performance of the proposed approach.
© 2013 IEEE.
Number of references:50
Main heading:High level languages
Controlled terms:Natural language processing systems - Semantics
Uncontrolled terms:Attention mechanisms - Feature representation - High level semantics - Image captioning - NAtural language processing - Natural languages - Question Answering - Spatial informations
Classification code:723.1.1 Computer Programming Languages - 723.2 Data Processing and Image Processing
DOI:10.1109/TCYB.2019.2914351
Funding details: Number: 61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSWJSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:Manuscript received May 21, 2018; revised January 27, 2019 and April 20, 2019; accepted April 26, 2019. Date of publication May 17, 2019; date of current version January 15, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61772510, and in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSWJSC015. This paper was recommended by Associate Editor H. Lu. (Corresponding author: Xiaoqiang Lu.) X. Li is with the School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi’an 710072, China.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20213410804893
Title:Multi-brightness layers with a genetic optimization algorithm for stereo matching under dramatic illumination changes
Authors:Yang, Tao (1, 2); Yang, Rui (3); Qiu, Yuehong (1)
Author affiliation:(1) Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, No. 17 Xinxi Road, Shaanxi, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing; 100049, China; (3) Putian University, No. 1133 Xueyuan Road, Fujian, Putian; 351100, China
Corresponding author:Yang, Rui(781307404@qq.com)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:24
Issue date:August 20, 2021
Publication year:2021
Pages:7371-7380
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Stereo matching under dramatic illumination changes is a big challenge in imbalanced binocular vision, selfdriving cars, and the remote sensing image field. A novel, to the best of our knowledge, multi-brightness layer mechanism with a genetic optimization algorithm is proposed in this paper. The mechanism of multi-brightness layers transforms the two images with dramatic illumination changes into a series of matched pairs with similar brightness by the stretching function and histogram matching principle. Therefore, the large illumination variations are reduced greatly. Moreover, the initial disparities as first generation of genetic optimization approach are generated from matched pairs using fast segmentation local stereo matching to increase the efficiency and accuracy. For further improving the accuracy of disparity, an enhanced genetic optimization algorithm for stereo matching is designed to have more inliers and continuity. The experimental results comparing with state-of-theart stereo matching methods demonstrate that the proposed method has better performance in accuracy and stability.
© 2021 Optical Society of America.
Number of references:44
Main heading:Stereo image processing
Controlled terms:Binocular vision - Genetic algorithms - Luminance - Remote sensing - Stereo vision
Uncontrolled terms:Genetic optimization - Genetic optimization algorithm - Histogram matching - Illumination changes - Illumination variation - Local stereo matching - Remote sensing images - Stereo matching method
Classification code:723.2 Data Processing and Image Processing - 741.2 Vision
DOI:10.1364/AO.432015

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204409443313
Title:Development of low-loss lead-germanate glass for mid-infrared fiber optics: II. preform extrusion and fiber fabrication
Authors:Wang, Pengfei (1, 2, 3); Ng, Alson Kwun Leung (1); Dowler, Alastair (1); Ebendorff-Heidepriem, Heike (1)
Author affiliation:(1) Institute of Photonics and Advanced Sensing, School of Physical Sciences, The University of Adelaide, Adelaide; SA, Australia; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an, China
Corresponding author:Wang, Pengfei(pfwang@opt.ac.cnemailheike.ebendorff@adelaide.edu.auemailpfwang@opt.ac.cnemailpfwang@opt.ac.cn)Ng, Alson Kwun Leung(heike.ebendorff@adelaide.edu.auemailpfwang@opt.ac.cnemailpfwang@opt.ac.cn)Dowler, Alastair(pfwang@opt.ac.cnemailpfwang@opt.ac.cn)Heike, Ebendorff-Heidepriem(pfwang@opt.ac.cn)Pengfei, Wang(pfwang@opt.ac.cn)Pengfei, Wang(pfwang@opt.ac.cn)
Source title:Journal of the American Ceramic Society
Abbreviated source title:J Am Ceram Soc
Volume:104
Issue:2
Issue date:February 2021
Publication year:2021
Pages:833-850
Language:English
ISSN:00027820
E-ISSN:15512916
CODEN:JACTAW
Document type:Journal article (JA)
Publisher:Blackwell Publishing Inc.
Abstract:For lead-germanate glass fibers, reducing the content of hydroxyl (OH) groups and the formation of metallic Pb species is essential to pave the way for their applications as low-loss mid-IR fiber optics since OH and metallic Pb species cause intense absorption and scattering loss, respectively, in the mid-IR spectral range. The first part of this study reported the optimization of the glass melting procedure to obtain low amount of OH while preventing formation of metallic Pb species in lead-germanate glass. Here, the second part of this study reports the investigation of the process conditions to fabricate low-loss lead-germanate glass fiber through further understanding of the co-effects of glass melting and heat treatment atmospheres on the formation of nano- and micron-scale metallic Pb species in both the as-produced and heat treated lead-germanate glasses. Finally, using this advance in knowledge, we successfully fabricated low-loss lead-germanate glass fibers with no presence of reduced metallic Pb particles by optimizing dehydration agent, glass melting, preform extrusion and fiber drawing conditions. The optimized fabrication conditions reduced the unstructured fiber loss by almost one order to <0.3 dB/m at 1.55 μm.
© 2020 American Ceramic Society (ACERS)
Number of references:58
Main heading:Fabrication
Controlled terms:Dehydration - Extrusion - Fiber optics - Glass fibers - Glass manufacture - Heat treatment - Lead - Melting - Preforming
Uncontrolled terms:Absorption and scatterings - Fiber drawing - Glass melting - IR spectral range - Lead germanate - Micron scale - Midinfrared - Process condition
Classification code:537.1 Heat Treatment Processes - 546.1 Lead and Alloys - 741.1.2 Fiber Optics - 802.2 Chemical Reactions - 802.3 Chemical Operations - 812.3 Glass
DOI:10.1111/jace.17518
Funding details: Number: 201704910379, Acronym: CSC, Sponsor: China Scholarship Council;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;Number: 144033, Acronym: AFOSR, Sponsor: Air Force Office of Scientific Research;Number: -, Acronym: -, Sponsor: University of Adelaide;
Funding text:We acknowledge the Asian Office of Aerospace Research and Development project (Air Force Office of Scientific Research Grant #144033) for funding this work. This work was performed in part at the OptoFab node of the Australian National Fabrication Facility (ANFF) utilizing Commonwealth and South Australian State Government Funding. Pengfei Wang gives his special thanks to China Scholarship Council (CSC No. 201704910379) for supporting his visiting research in the University of Adelaide.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212210426649
Title:Optical remote sensing image denoising and super-resolution reconstructing using optimized generative network in wavelet transform domain????(Open Access)
Authors:Feng, Xubin (1, 2); Zhang, Wuxia (3); Su, Xiuqin (1, 2); Xu, Zhengpu (4)
Author affiliation:(1) Space Precision Measurement Laboratory, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) Joint Laboratory for Ocean Observation and Detection (Xi’an Institute of Optics and Precision Mechanics), Pilot National Laboratory for Marine Science and Technology, Qingdao; 266200, China; (3) School of Computer Science and Technology, Xi’an University of Posts and Telecommunications, Xi’an; 710121, China; (4) School of Computer Science and Technology, Xidian University, Xi’an; 710071, China
Corresponding author:Zhang, Wuxia(zhangwuxia@xupt.edu.cn)
Source title:Remote Sensing
Abbreviated source title:Remote Sens.
Volume:13
Issue:9
Issue date:May 1, 2021
Publication year:2021
Article number:1858
Language:English
E-ISSN:20724292
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

High spatial quality (HQ) optical remote sensing images are very useful for target detection, target recognition and image classification. Due to the influence of imaging equipment accuracy and atmospheric environment, HQ images are difficult to acquire, while low spatial quality (LQ) remote sensing images are very easy to acquire. Hence, denoising and super-resolution (SR) reconstruction technology are the most important solutions to improve the quality of remote sensing images very effectively, which can lower the cost as much as possible. Most existing methods usually only employ denoising or SR technology to obtain HQ images. However, due to the complex structure and the large noise of remote sensing images, the quality of the remote sensing image obtained only by denoising method or SR method cannot meet the actual needs. To address these problems, a method of reconstructing HQ remote sensing images based on Generative Adversarial Network (GAN) named "Restoration Generative Adversarial Network with ResNet and DenseNet" (RRDGAN) is proposed, which can acquire better quality images by incorporating denoising and SR into a unified framework. The generative network is implemented by fusing Residual Neural Network (ResNet) and Dense Convolutional Network (DenseNet) in order to consider denoising and SR problems at the same time. Then, total variation (TV) regularization is used to furthermore enhance the edge details, and the idea of Relativistic GAN is explored to make the whole network converge better. Our RRDGAN is implemented in wavelet transform (WT) domain, since different frequency parts could be handled separately in the wavelet domain. The experimental results on three different remote sensing datasets shows the feasibility of our proposed method in acquiring remote sensing images.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:45
Main heading:Remote sensing
Controlled terms:Convolutional neural networks - Image acquisition - Image denoising - Image enhancement - Image reconstruction - Optical resolving power - Wavelet transforms
Uncontrolled terms:Adversarial networks - Atmospheric environment - Convolutional networks - Optical remote sensing - Remote sensing images - Super resolution reconstruction - Total variation regularization - Wavelet-transform domain
Classification code:723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 921.3 Mathematical Transformations
DOI:10.3390/rs13091858
Funding details: Number: XUPT-KLND(201902, Acronym: -, Sponsor: -;Number: 62001378, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20JK0913, Acronym: -, Sponsor: Education Department of Shaanxi Province;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 62001378, in part by the Shaanxi Provincial Department of Education 2020 Scientific Research Plan under Grant 20JK0913, and in part by the Shaanxi Province Network Data Analysis and Intelligent Processing Key Laboratory Open Fund under Grant XUPT-KLND(201902).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20205009599322
Title:Peregrine combs and rogue waves on a bright soliton background
Authors:Guo, Lehui (1, 2, 3); Chen, Ping (1, 2); Tian, Jinshou (1, 3)
Author affiliation:(1) Key Laboratory of Ultra-Fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Chen, Ping(chenping@opt.cn)
Source title:Optik
Abbreviated source title:Optik
Volume:227
Issue date:February 2021
Publication year:2021
Article number:165455
Language:English
ISSN:00304026
Document type:Journal article (JA)
Publisher:Elsevier GmbH
Abstract:The dynamics of the modulation rogue waves in an inhomogeneous nonlinear optical fiber with the periodic modulation are studied. We find that for different modulation amplitudes and modulation frequencies, the modulation rogue wave solution can be Peregrine comb, rogue wave, or the transition state in between, respectively. In particular, the phase diagram of the three kinds of nonlinear states is given at the modulation amplitude and modulation frequency plane. Moreover, the dynamics characteristics of the Peregrine comb and the rogue wave are discussed on the localized soliton background. It is interesting that the main excitation characteristics of the Peregrine combs and the rogue waves on an infinitely wide plane wave background are well maintained on the soliton background. These results pave the way for exciting and manipulating the rogue waves on a local background.
© 2020 Elsevier GmbH
Number of references:43
Main heading:Frequency modulation
Controlled terms:Nonlinear optics - Optical fibers - Solitons
Uncontrolled terms:Bright solitons - Dynamics characteristic - Excitation characteristics - Modulation amplitudes - Modulation frequencies - Non-linear optical fibers - Periodic modulation - Transition state
Classification code:741.1.1 Nonlinear Optics - 741.1.2 Fiber Optics
DOI:10.1016/j.ijleo.2020.165455
Funding details: Number: GJJSTD20190004, Acronym: -, Sponsor: -;Number: 11805267, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work is supported by grants from N ational Natural Science Foundation of China (Grant No. 11805267) and C hinese Academy of Sciences (Grant No. GJJSTD20190004) .

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204209343663
Title:Development of low-loss lead-germanate glass for mid-infrared fiber optics: I. glass preparation optimization
Authors:Wang, Pengfei (1, 2, 3); Bei, Jiafang (1); Ahmed, Naveed (1); Ng, Alson Kwun Leung (1); Ebendorff-Heidepriem, Heike (1)
Author affiliation:(1) Institute of Photonics and Advanced Sensing, School of Physical Sciences, The University of Adelaide, Adelaide; SA, Australia; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an Shaanxi, China
Corresponding author:Wang, Pengfei(pfwang@opt.ac.cnemailheike.ebendorff@adelaide.edu.auemailpfwang@opt.ac.cnemailpfwang@opt.ac.cn)Ebendorff-Heidepriem, Heike(heike.ebendorff@adelaide.edu.auemailpfwang@opt.ac.cnemailpfwang@opt.ac.cn)Wang, Pengfei(pfwang@opt.ac.cnemailpfwang@opt.ac.cn)Wang, Pengfei(pfwang@opt.ac.cn)
Source title:Journal of the American Ceramic Society
Abbreviated source title:J Am Ceram Soc
Volume:104
Issue:2
Issue date:February 2021
Publication year:2021
Pages:860-876
Language:English
ISSN:00027820
E-ISSN:15512916
CODEN:JACTAW
Document type:Journal article (JA)
Publisher:Blackwell Publishing Inc.
Abstract:Reducing the mid-infrared attenuation loss due to absorption of hydroxyl (OH) groups and scattering of metallic Pb species for lead-germanate glass is essential to pave the way for their applications as low-loss mid-infrared fiber optics. In the first part of this study, we report the understanding of the factors that determine dehydration efficiency and metallic Pb formation during the lead-germanate glassmelting process. Combining a dry O2-rich atmosphere containing ultra-dry N2 together with the use of chloride dehydration agent and nitrate oxidation agent compound was found to enable efficient dehydration effect and absence of metallic Pb scattering sources in the dehydrated glasses. This glassmelting procedure overcomes previous limitations on the preparation of similar kinds of heavy-metal oxide glasses, where only pure O2 atmosphere was used and/or use of fluoride dehydration agent deteriorated the glass thermal stability. This work provides guidance for developing other low-loss mid-infrared glasses/fibers containing multivalent heavy-metal ions such as Pb, Bi, Te, Sb, etc.
© 2020 American Ceramic Society (ACERS)
Number of references:38
Main heading:Glass
Controlled terms:Chlorine compounds - Dehydration - Fiber optics - Fluorine compounds - Infrared devices - Lead - Metal ions
Uncontrolled terms:Attenuation loss - Dehydration efficiency - Glass melting - Glass melting process - Glass preparation - Heavy metal oxide glass - Lead germanate - Scattering source
Classification code:531.1 Metallurgy - 546.1 Lead and Alloys - 741.1.2 Fiber Optics - 802.2 Chemical Reactions - 812.3 Glass
DOI:10.1111/jace.17503
Funding details: Number: -, Acronym: CSC, Sponsor: China Scholarship Council;Number: 201704910379, Acronym: CSC, Sponsor: China Scholarship Council;Number: 144033, Acronym: AFOSR, Sponsor: Air Force Office of Scientific Research;Number: -, Acronym: -, Sponsor: University of Adelaide;
Funding text:We acknowledge the Asian Office of Aerospace Research and Development project (Air Force Office of Scientific Research Grant #144033) for funding this work. This work was performed in part at the OptoFab node of the Australian National Fabrication Facility (ANFF) utilizing Commonwealth and South Australian State Government Funding. We acknowledge Ben Wade in Adelaide Microscopy for electron microprobe measurement and Rui Wan for help with DSC measurement. Pengfei Wang gives his special thanks to China Scholarship Council (CSC No. 201704910379) for supporting his visiting research at the University of Adelaide.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710256596
Title:Adaptive multiscale feature for object detection
Authors:Yu, Xiaoyong (1, 2); Wu, Siyuan (1); Lu, Xiaoqiang (1); Gao, Guilong (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China
Corresponding author:Wu, Siyuan(wusiyuan@opt.ac.cn)
Source title:Neurocomputing
Abbreviated source title:Neurocomputing
Volume:449
Issue date:August 18, 2021
Publication year:2021
Pages:146-158
Language:English
ISSN:09252312
E-ISSN:18728286
CODEN:NRCGEO
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

In object detection, multiscale features are necessary to deal with objects with different size. Using Feature Pyramid Network (FPN) as the backbone network is a very popular paradigm in existing object detectors, we call this paradigm FPN+. However, feature fusion of FPN is insufficient to express object of similar size but different appearance due to the unidirectional feature fusion. We motivate and present Adaptive Multiscale Feature (AMF), a new multiscale feature fusion method with bidirectional feature fusion, using to solve the one-direction fusion of FPN. AMF module fuses multiscale features from two aspects: (1) shattering features by the way of CLSM; (2) fusing features by the way of channel-wise attention. The proposed AMF improves the expression ability of multiscale features of the backbone network, and effectively improves the performance of the object detector. The proposed feature fusion method can be added to all object detector, such as the one-stage detector, the two-stage detector, anchor-based detector and anchor-free based detector. Experimental results on the COCO 2014 dataset show that the proposed AMF module performs the popular FPN based detector. Whether anchored-free based detectors or anchored based detectors, performance of detector can be improved through AMF. And the resulting best model can achieve a very competitive mAP on COCO 2014 dataset.
© 2021 Elsevier B.V.
Number of references:40
Main heading:Object detection
Controlled terms:Classification (of information) - Feature extraction - Object recognition
Uncontrolled terms:Adaptation - Anchor-free - Backbone networks - Classification networks - Feature pyramid - Features fusions - Multi-scale features - Object detectors - Objects detection - Pyramid network
Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 903.1 Information Sources and Analysis
DOI:10.1016/j.neucom.2021.04.002
Funding details: Number: 61702498,62005311, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 61702498, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the CAS Light of West China Program under Grant XAB2017B15, in part by the National Natural Science Foundation of China (NSFC) (Grant No. 62005311).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204509465321
Title:Audio description from image by modal translation network????(Open Access)
Authors:Ning, Hailong (1, 2); Zheng, Xiangtao (1); Yuan, Yuan (3); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The Center for OPTical IMagery Analysis and Learning (OPTIMAL), School of the Computer Science, Northwestern Polytechnical University, Xi'an; Shaanxi; 710072, China
Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)
Source title:Neurocomputing
Abbreviated source title:Neurocomputing
Volume:423
Issue date:January 29, 2021
Publication year:2021
Pages:124-134
Language:English
ISSN:09252312
E-ISSN:18728286
CODEN:NRCGEO
Document type:Journal article (JA)
Publisher:Elsevier B.V., Netherlands
Abstract:Audio is the main form for the visually impaired to obtain information. In reality, all kinds of visual data always exist, but audio data does not exist in many cases. In order to help the visually impaired people to better perceive the information around them, an image-to-audio-description (I2AD) task is proposed to generate audio descriptions from images in this paper. To complete this totally new task, a modal translation network (MT-Net) from visual to auditory sense is proposed. The proposed MT-Net includes three progressive sub-networks: 1) feature learning, 2) cross-modal mapping, and 3) audio generation. First, the feature learning sub-network aims to learn semantic features from image and audio, including image feature learning and audio feature learning. Second, the cross-modal mapping sub-network transforms the image feature into a cross-modal representation with the same semantic concept as the audio feature. In this way, the correlation of inter-modal data is effectively mined for easing the heterogeneous gap between image and audio. Finally, the audio generation sub-network is designed to generate the audio waveform from the cross-modal representation. The generated audio waveform is interpolated to obtain the corresponding audio file according to the sample frequency. Being the first attempt to explore the I2AD task, three large-scale datasets with plenty of manual audio descriptions are built. Experiments on the datasets verify the feasibility of generating intelligible audio from an image directly and the effectiveness of proposed method.
© 2020 Elsevier B.V.
Number of references:59
Main heading:Machine learning
Controlled terms:Large dataset - Mapping - Modal analysis - Semantics
Uncontrolled terms:Audio description - Cross-modal representations - Feature learning - Large-scale datasets - Sample frequency - Semantic features - Visually impaired - Visually impaired people
Classification code:405.3 Surveying - 921 Mathematics
DOI:10.1016/j.neucom.2020.10.053
Funding details: Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: 61825603,QYZDY-SSW-JSC044, Acronym: -, Sponsor: -;Number: 61632018,61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,XAB2017B15,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grant XAB2017B26, and Grant XAB2017B15, in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340, in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61825603, in part by the State Key Program of National Natural Science of China under Grant 61632018.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20213610868178
Title:Difference curvature multidimensional network for hyperspectral image super-resolution????(Open Access)
Authors:Zhang, Chi (1); Zhang, Mingjin (1); Li, Yunsong (1); Gao, Xinbo (1, 2); Shi, Qiu (3)
Author affiliation:(1) State Key Laboratory of Integrated Services Networks, School of Telecommunications Engineering, Xidian University, Xi’an; 710071, China; (2) Chongqing Key Laboratory of Image Cognition, Chongqing University of Posts and Telecommunications, Chongqing; 400065, China; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China
Corresponding author:Zhang, Mingjin(mjinzhang@xidian.edu.cn)
Source title:Remote Sensing
Abbreviated source title:Remote Sens.
Volume:13
Issue:17
Issue date:September 2021
Publication year:2021
Article number:3455
Language:English
E-ISSN:20724292
Document type:Journal article (JA)
Publisher:MDPI
Abstract:

In recent years, convolutional-neural-network-based methods have been introduced to the field of hyperspectral image super-resolution following their great success in the field of RGB image super-resolution. However, hyperspectral images appear different from RGB images in that they have high dimensionality, implying a redundancy in the high-dimensional space. Existing approaches struggle in learning the spectral correlation and spatial priors, leading to inferior performance. In this paper, we present a difference curvature multidimensional network for hyperspectral image super-resolution that exploits the spectral correlation to help improve the spatial resolution. Specifically, we introduce a multidimensional enhanced convolution (MEC) unit into the network to learn the spectral correlation through a self-attention mechanism. Meanwhile, it reduces the redundancy in the spectral dimension via a bottleneck projection to condense useful spectral features and reduce computations. To remove the unrelated information in high-dimensional space and extract the delicate texture features of a hyperspectral image, we design an additional difference curvature branch (DCB), which works as an edge indicator to fully preserve the texture information and eliminate the unwanted noise. Experiments on three publicly available datasets demonstrate that the proposed method can recover sharper images with minimal spectral distortion compared to state-of-the-art methods. PSNR/SAM is 0.3–0.5 dB/0.2–0.4 better than the second best methods.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:56
Main heading:Image enhancement
Controlled terms:Convolution - Convolutional neural networks - Optical resolving power - Redundancy - Spectroscopy - Textures
Uncontrolled terms:Attention mechanisms - High dimensional spaces - Image super resolutions - Multi-dimensional networks - Spectral correlation - Spectral dimensions - Spectral distortions - State-of-the-art methods
Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics
DOI:10.3390/rs13173455
Funding details: Number: 20200103, Acronym: -, Sponsor: -;Number: 61902293, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: XJS200112, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: 2021GY-034, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;
Funding text:Funding: This work was supported in part by the National Natural Science Foundation of China under Grant 61902293; in part by the Key Research and Development Program of Shaanxi under Grant 2021GY-034; in part by the Young Talent Fund of University Association for Science and Technology, Shaanxi, China, under Grant 20200103; in part by the Fundamental Research Funds for the Central Universities under Grant XJS200112.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20210709904693
Title:Thermal Analysis of Visible Emission from Micro-Ring Resonators by Third-Harmonic Generation
Authors:Wang, Shao Hao (1); Li, Yuhua (2); Wang, Leiran (3); Little, Brent E. (3); Chu, Sai Tak (4)
Author affiliation:(1) FZU-Jinjiang Joint Institute of Microelectronics, Jinjiang Science and Education Park, Fuzhou University, Jinjiang, China; (2) Department of Physics, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (4) Department of Physics, City University of Hong Kong, Hong Kong, Hong Kong
Corresponding author:Wang, Shao Hao(shwang@fzu.edu.cn)
Source title:IEEE Photonics Technology Letters
Abbreviated source title:IEEE Photonics Technol Lett
Volume:33
Issue:5
Issue date:March 1, 2021
Publication year:2021
Pages:235-238
Article number:9335593
Language:English
ISSN:10411135
E-ISSN:19410174
CODEN:IPTLEL
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

We present a thermal model to describe the interaction between the visible modes in micro-ring resonators from the third harmonic generation (THG) nonlinear process. We demonstrate that the model can predict the thermal characteristics of the orthogonal THG modes from the interaction and of the resonance coupling between them in micro-ring resonators having a strong nonlinear thermo-optic coefficient. Furthermore, the model can be used to extract the THG efficiency, the linear and nonlinear thermo-optic coefficients and the polarization dependency of the THG modes from the measurement data.
© 1989-2012 IEEE.
Number of references:13
Main heading:Harmonic generation
Controlled terms:Optical resonators - Thermoanalysis
Uncontrolled terms:Measurement data - Microring resonator - Nonlinear process - Polarization dependency - Resonance couplings - Thermal characteristics - Thermo-optic coefficients - Visible emissions
Classification code:741.3 Optical Devices and Systems - 801 Chemistry
DOI:10.1109/LPT.2021.3054379

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204809550114
Title:A MOSFET-based high voltage nanosecond pulse module for the gating of proximity-focused microchannel plate image-intensifier
Authors:Fang, Yuman (1, 2); Gou, Yongsheng (1); Zhang, Minrui (1); Wang, Junfeng (1); Tian, Jinshou (1, 3)
Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Tian, Jinshou(tianjs@opt.ac.cn)
Source title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Abbreviated source title:Nucl Instrum Methods Phys Res Sect A
Volume:987
Issue date:January 21, 2021
Publication year:2021
Article number:164799
Language:English
ISSN:01689002
CODEN:NIMAER
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:Gate modules based on avalanche technology for photocathode gating to proximity-focused microchannel-plate image intensifier (MCPII) are often limited to short gate exposures. A nanosecond pulse module based on MOSFET devices has been demonstrated at our lab, which is capable of generating pulses of adjustable full width at half maximum (FWHM) from 3 ns to D.C. operation with 1 ns switching time and a burst repetition rate up to 4 MHz. A method of supplying gate-current pulses to the MOSFET device is adopted to increase the switching speed based on the totem pole driver. Nanosecond optical gating time of an 18-mm proximity-focused MCPII with a metallic underlay photocathode was obtained. A MCPII with standard multi-alkali photocathode was analyzed for comparison. Moreover, a photocathode-MCP model based on the Finite Integral Technique (FIT) is developed to investigate the dependence of the gating time on the sheet resistance of the photocathode.
© 2020 Elsevier B.V.
Number of references:24
Main heading:MOSFET devices
Controlled terms:Image intensifiers (solid state) - Image storage tubes - Microchannels - Photocathodes - Pulse repetition rate - Ultrafast lasers
Uncontrolled terms:Burst repetition rate - Finite integral techniques - High voltage nanosecond pulse - Micro channel plate - Model-based OPC - Nanosecond pulse - Optical gatings - Switching speed
Classification code:714.1 Electron Tubes - 714.2 Semiconductor Devices and Integrated Circuits - 744.1 Lasers, General
Numerical data indexing:Frequency 4.00e+06Hz, Size 1.80e-02m, Time 1.00e-09s
DOI:10.1016/j.nima.2020.164799

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510544783
Title:Design and Realization of Visible/LWIR Dual-color Common Aperture Optical System
Title of translation:可见/红外双色共孔径光学系统设计及实现
Authors:Ma, Zhanpeng (1, 2); Xue, Yaoke (1, 4, 5); Shen, Yang (1); Zhao, Chunhui (3); Zhou, Canglong (1, 2); Lin, Shangmin (1, 2); Wang, Hu (1, 2)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanism, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Beijing Institute of Control Engineering, Beijing; 100190, China; (4) Youth Innovation Promotion Association, Beijing; 100037, China; (5) Beijing University of Aeronautics and Astronautics, Beijing; 100191, China
Corresponding author:Wang, Hu(wanghu@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:5
Issue date:May 25, 2021
Publication year:2021
Article number:0511002
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

In order to solve the problems of poor imaging quality, complex structure and large volume of existing dual-band common aperture cameras, a visible/long-wave infrared dual-color optical system was proposed. Simultaneous imaging is achieved by sharing the front-end reflection structure in the two bands and adding a dichroic beam splitter on the back of the main mirror, thereby ensuring the compactness of the system structure. The influence of the dichroic beam splitter on the infrared band imaging was analyzed in detail, as well as the influence of different angles of the dichroic beam splitter from vertical direction. The correct system of long wave infrared band and the image plane were eccentrically processed by -2.39 mm, so the image quality of the infrared band was greatly improved. The validity of the analysis conclusion was verified by the field test imaging. The results show that the system has loose tolerances, simple structure, and a few optical components. This system has the advantages of easy processing, installation, and strong engineering feasibility, which can effectively improve the target detection and recognition capabilities of the camera.
© 2021, Science Press. All right reserved.
Number of references:16
Main heading:Optical systems
Controlled terms:Cameras - Image enhancement - Image quality - Infrared radiation - Light polarization - Prisms - Structure (composition)
Uncontrolled terms:Complex structure - Dichroic beamsplitter - Engineering feasibility - Long wave infrared bands - Optical components - Simultaneous imaging - Target detection and recognition - Vertical direction
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 951 Materials Science
Numerical data indexing:Size -2.39e-03m
DOI:10.3788/gzxb20215005.0511002
Funding details: Number: 11803075, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China(No. 11803075).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211510214214
Title:Atmospheric diffuse plasma jet formation from positive-pseudo-streamer and negative pulseless glow discharges????(Open Access)
Authors:Li, Jing (1, 2, 3); Lei, Bingying (1, 2); Wang, Jing (1, 2); Xu, Boping (1, 2); Ran, Shuang (1, 2); Wang, Yishan (1, 2); Zhang, Tongyi (1, 2); Tang, Jie (1, 2); Zhao, Wei (1, 2); Duan, Yixiang (4)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing, China; (3) Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huai’an, China; (4) Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, China
Corresponding author:Tang, Jie(tangjie@opt.ac.cn)
Source title:Communications Physics
Abbreviated source title:Commun. Phys.
Volume:4
Issue:1
Issue date:December 2021
Publication year:2021
Article number:64
Language:English
E-ISSN:23993650
Document type:Journal article (JA)
Publisher:Nature Research
Abstract:

Atmospheric gas discharge is very likely to constrict into filaments and diffuse plasma formation is inefficient in most cases. Developing cost-efficient atmospheric diffuse plasma devices represents a significant challenge for high performance in biomedical decontamination and material processing. Here, we propose an alternative roadmap to produce a diffuse argon plasma jet by expanding and quenching the existing filamentary discharge at the initial or middle stage of streamer development. Possible mechanisms are summarized. With the gas flow velocity comparable to the ion drift one, enhancing ambipolar diffusion near the edge of the positive-streamer channel promotes the radial diffusion of newly-produced electrons, realizing the radial expansion of channel. Weakening electric field in front of the streamer head through head expansion and field offset, prevents the further development of streamer, leading to a positive-pseudo-streamer discharge. Reducing electric field in front of the negative-streamer head through ion compensation, impedes the initial growth of streamer, resulting in a negative pulseless glow discharge. The positive-pseudo-streamer and negative pulseless glow discharges function together to form the diffuse plasma jet.
© 2021, The Author(s).
Number of references:49
Main heading:Glow discharges
Controlled terms:Expansion - Flow of gases - Flow velocity - Plasma jets
Uncontrolled terms:Ambipolar diffusion - Filamentary discharges - Material processing - Negative streamers - Positive streamers - Possible mechanisms - Radial expansions - Streamer discharges
Classification code:631 Fluid Flow - 631.1.2 Gas Dynamics - 701.1 Electricity: Basic Concepts and Phenomena - 932.3 Plasma Physics - 951 Materials Science
DOI:10.1038/s42005-021-00566-8
Funding details: Number: S19-020-III, Acronym: -, Sponsor: -;Number: LSIT201807G, Acronym: -, Sponsor: -;Number: 51877210, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021-III, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;Number: 2020JM-309, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:The authors acknowledge financial support from the National Natural Science Foundation of China (Grant No. 51877210), the Natural Science Foundation of Shaanxi Province (Grant No. 2020JM-309), the Natural Science Basic Research Program of Shaanxi (Grant No. 2019JCW-03), the Key Deployment Research Program of XIOPM (Grant No. S19-020-III), the Major Science and Technology Infrastructure Pre-research Program of the CAS (Grant No. J20-021-III), the Open Research Fund of Key Laboratory of Spectral Imaging Technology of the CAS (Grant No. LSIT201807G), and the China Scholarship Council (CSC).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212010370841
Title:Non-Invasive Measurement for Cardiac Variations Using a Fiber Optic Sensor
Authors:Lyu, Weimin (1); Xu, Wei (2, 3); Yang, Fangang (4); Chen, Shuyang (5); Tan, Fengze (1); Yu, Changyuan (5)
Author affiliation:(1) Shenzhen Research Institute, Hong Kong Polytechnic University, Shenzhen, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Electrical and Computer Engineering, National University of Singapore, Singapore; (5) Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong
Corresponding author:Yu, Changyuan(changyuan.yu@polyu.edu.hk)
Source title:IEEE Photonics Technology Letters
Abbreviated source title:IEEE Photonics Technol Lett
Volume:33
Issue:18
Issue date:September 15, 2021
Publication year:2021
Pages:990-993
Article number:9427109
Language:English
ISSN:10411135
E-ISSN:19410174
CODEN:IPTLEL
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Cardiovascular diseases (CVDs) are very common in modern society, such as atherosclerosis, hypertension, etc., which have a great impact on heart function. Therefore, hospitalization monitoring alone is far from enough. Long-term monitoring of the heart is needed in daily life. The technology of non-invasive monitoring of the cardiovascular system can meet the needs of long-term monitoring of the heart condition, helping to promote the improvement of lifestyle and daily care, reducing the overall risk of developing CVDs. The purpose of this study is to investigate the cardiac response after different exercises using a 3\times 3 demodulation scheme-based ballistocardiography (BCG) monitoring system. A fiber optic sensor (FOS)-based smart cushion is used to replace the traditional inconvenient electrocardiogram (ECG) for heart rate variability (HRV). The correlation between BCG inter-beat interval (IBI) and ECG IBI is 0.9862, and the RMSE is 0.0139. The BCG signal can assess cardiac contractility by analyzing RJ interval with ECG, which is a practical alternative to the pre-ejection period (PEP).
© 1989-2012 IEEE.
Number of references:18
Main heading:Heart
Controlled terms:Diseases - Electrocardiography - Fiber optic sensors - Fiber optics - Monitoring
Uncontrolled terms:Ballistocardiography - Cardiac contractility - Cardio-vascular disease - Heart rate variability - Long term monitoring - Monitoring system - Non- invasive measurements - Non-invasive monitoring
Classification code:461.2 Biological Materials and Tissue Engineering - 461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics
DOI:10.1109/LPT.2021.3078757

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910345766
Title:A driver-assistance algorithm based on multi-feature fusion
Authors:Zhou, Dongmei (1); Qiu, Shi (2); Song, Yang (3)
Author affiliation:(1) Chengdu University of Technology, College of Information Science & Technology, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) High Technology Research and Development Center of the Ministry of Science and Technology, Beijing, China
Corresponding author:Qiu, Shi(qiushi215@163.com)
Source title:Infrared Physics and Technology
Abbreviated source title:Infrared Phys Technol
Volume:116
Issue date:August 2021
Publication year:2021
Article number:103747
Language:English
ISSN:13504495
CODEN:IPTEEY
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

The lane line is difficult to be distinguished in visible light for driver assistance, so a multi-feature fusion model is built from the perspective of infrared images to realize assistant driving. Firstly, the features of infrared imaging are analyzed, and the Enet network is improved to focus on the area of the lane line and locate the passable area. Then, the previous vehicle is located to guide the current vehicle based on the fuzzy set theory. Finally, a spatiotemporal association model is constructed. By constructing the relationship between the guiding vehicle and spatiotemporal traffic, the relationship between human-computer interaction is indirectly established to guide vehicle assisted driving. Our experimental results show that the proposed algorithm is in line with the manual driving process, and good results can be achieved under complex road conditions.
© 2021
Number of references:35
Main heading:Fuzzy sets
Controlled terms:Automobile drivers - Fuzzy set theory - Human computer interaction - Thermography (imaging) - Vehicles
Uncontrolled terms:'current - Driver assistance - Enet - Fusion model - Fuzzy-set theory - Lane line - Multi-feature fusion - Spatiotemporal association - Vehicle guidance - Visible light
Classification code:432 Highway Transportation - 742.1 Photography - 912.4 Personnel - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
DOI:10.1016/j.infrared.2021.103747
Funding text:This work is supported by Postdoctoral Science Foundation of China under Grant No. 2020M682144.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310467002
Title:Design and characterization of a thermally stabilized fiber Fabry-Perot etalon as a wavelength calibrator for high-precision spectroscopy
Authors:Tang, Liang (1, 2); Ye, Huiqi (1, 2); Hao, Jun (1, 2, 3); Wei, Ruyi (4); Xiao, Dong (1, 2)
Author affiliation:(1) National Astronomical Observatories, Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing; 210042, China; (2) CAS Key Laboratory of Astronomical Optics and Technology, Nanjing Institute of Astronomical Optics and Technology, Nanjing; 210042, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Xi'an Institute of Optics Precision and Mechanic, Chinese Academy of Sciences, Xi'an; 710119, China
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:19
Issue date:July 1, 2021
Publication year:2021
Pages:D1-D8
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Filtering light from a broadband source with a Fabry-Perot etalon generates comb-like peaks in the spectral domain that can serve as calibration reference for precise Doppler shift detection on astronomical spectrographs. Fiber Fabry-Perot etalons are small in size and easily aligned optically. In application, high thermal sensitivity of the fiber core material requires a highly stable temperature control system. Here, we report on the design, characterization, and thermal performance of a fiber Fabry-Perot etalon-based calibrator system insensitive to environmental temperature perturbation, aimed as a reference for m s-1 precision radial velocity measurements. A fast and simple method to estimate the etalon finesse and a dual-loop approach to achieve sub-millikelvin temperature fluctuation are proposed and demonstrated.
© 2021 Optical Society of America.
Number of references:19
Main heading:Fabry-Perot interferometers
Controlled terms:Coremaking - Etalons - Fibers
Uncontrolled terms:Astronomical spectrographs - Calibration reference - Environmental temperature - Fabry-Perot etalons - High-precision spectroscopy - Millikelvin temperatures - Radial velocity measurements - Thermal Performance
Classification code:534.2 Foundry Practice - 941.3 Optical Instruments
DOI:10.1364/AO.417586

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211110072662
Title:Semantics-Consistent Representation Learning for Remote Sensing Image-Voice Retrieval????(Open Access)
Authors:Ning, Hailong (1); Zhao, Bin (2); Yuan, Yuan (3)
Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China, also with the University of Chinese Academy of Sciences, Beijing 100049, China, and also with the School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an 710072, China.; (2) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an 710072, China.; (3) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an 710072, China (e-mail: y.yuan1.ieee@qq.com)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Issue date:2021
Publication year:2021
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:With the development of earth observation technology, massive amounts of remote sensing (RS) images are acquired. To find useful information from these images, cross-modal RS image-voice retrieval provides a new insight. This article aims to study the task of RS image-voice retrieval so as to search effective information from massive amounts of RS data. Existing methods for RS image-voice retrieval rely primarily on the pairwise relationship to narrow the heterogeneous semantic gap between images and voices. However, apart from the pairwise relationship included in the data sets, the intramodality and nonpaired intermodality relationships should also be considered simultaneously since the semantic consistency among nonpaired representations plays an important role in the RS image-voice retrieval task. Inspired by this, a semantics-consistent representation learning (SCRL) method is proposed for RS image-voice retrieval. The main novelty is that the proposed method takes the pairwise, intramodality, and nonpaired intermodality relationships into account simultaneously, thereby improving the semantic consistency of the learned representations for the RS image-voice retrieval. The proposed SCRL method consists of two main steps: 1) semantics encoding and 2) SCRL. First, an image encoding network is adopted to extract high-level image features with a transfer learning strategy, and a voice encoding network with dilated convolution is devised to obtain high-level voice features. Second, a consistent representation space is conducted by modeling the three kinds of relationships to narrow the heterogeneous semantic gap and learn semantics-consistent representations across two modalities. Extensive experimental results on three challenging RS image-voice data sets, including Sydney, UCM, and RSICD image-voice data sets, show the effectiveness of the proposed method.
IEEE
Main heading:Image enhancement
Controlled terms:Encoding (symbols) - Learning systems - Remote sensing - Semantics - Signal encoding - Space optics - Transfer learning
Uncontrolled terms:Earth Observation Technology - Image encoding - Image features - Inter modalities - Remote sensing images - Representation space - Semantic consistency - Voice retrieval
Classification code:656.1 Space Flight - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing
DOI:10.1109/TGRS.2021.3060705

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20212910660394
Title:Two-stream network for infrared and visible images fusion
Authors:Liu, Luolin (1, 2); Chen, Mulin (3); Xu, Mingliang (4); Li, Xuelong (3, 5)
Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; Shaanxi; 710072, China; (4) School of Information Engineering, Zhengzhou University, Zhengzhou; 450001, China; (5) Key Laboratory of Intelligent Interaction and Applications (Northwestern Polytechnical University), Ministry of Industry and Information Technology, Xi'an 710072, China
Corresponding author:Li, Xuelong(li@nwpu.edu.cn)
Source title:Neurocomputing
Abbreviated source title:Neurocomputing
Volume:460
Issue date:October 14, 2021
Publication year:2021
Pages:50-58
Language:English
ISSN:09252312
E-ISSN:18728286
CODEN:NRCGEO
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Long-wave infrared(thermal) images distinguish the target and background according to different thermal radiation. They are insensitive to light conditions, and cannot present details obtained from reflected light. By contrast, the visible images have high spatial resolution and texture details, but they are easily affected by the occlusion and light conditions. Combining the advantages of the two sources may generate a new image with clear targets and high resolution, which satisfy requirements in all-weather and all-day/night conditions. Most of the existing methods cannot fully capture the underlying characteristics in the infrared and visible images, and ignore complementary information between the sources. In this paper, we propose an end-to-end model (TSFNet) for infrared and visible image fusion, which is able to handle the sources simultaneously. In addition, it adopts an adaptive weight allocation strategy to capture the informative global features. Experiments on public datasets demonstrate the proposed fusion method achieves state-of-the-art performance, in both global visual quality and quantitative comparison.
© 2021
Number of references:29
Main heading:Image fusion
Controlled terms:Infrared imaging - Infrared radiation - Textures
Uncontrolled terms:Infrared and visible image - Infrared thermal image - Light conditions - Longwave infrared - Stream networks - Target and background - Thermal - Thermal images - Two-stream - Two-stream network
Classification code:723.2 Data Processing and Image Processing - 741.1 Light/Optics - 746 Imaging Techniques
DOI:10.1016/j.neucom.2021.05.034
Funding text:This work was supported by National Key Research and Development Program of China under Grant 2018AAA0102200, Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, and National Natural Science Foundation of China under Grant 61871470.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210309774632
Title:Accelerating patch-based low-rank image restoration using kd-forest and Lanczos approximation
Authors:Guo, Qiang (1, 2); Zhang, Yongxia (1, 2); Qiu, Shi (3); Zhang, Caiming (4)
Author affiliation:(1) School of Computer Science and Technology, Shandong University of Finance and Economics, Jinan; 250014, China; (2) Shandong Provincial Key Laboratory of Digital Media Technology, Jinan; 250014, China; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) School of Software, Shandong University, Jinan; 250100, China
Corresponding author:Guo, Qiang(guoqiang@sdufe.edu.cn)
Source title:Information Sciences
Abbreviated source title:Inf Sci
Volume:556
Issue date:May 2021
Publication year:2021
Pages:177-193
Language:English
ISSN:00200255
CODEN:ISIJBC
Document type:Journal article (JA)
Publisher:Elsevier Inc.
Abstract:Patch-based low-rank approximation (PLRA) via truncated singular value decomposition is a powerful and effective tool for recovering the underlying low-rank structure in images. Generally, it first performs an approximate nearest neighbors (ANN) search algorithm to group similar patches into a collection of matrices with reshaping them as vectors. The inherent correlation among similar patches makes these matrices have a low-rank structure. Then the singular value decomposition (SVD) is used to derive a low-rank approximation of each matrix by truncating small singular values. However, the conventional implementation of patch-based low-rank image restoration suffers from high computational cost of the ANN search and full SVD. To address this limitation, we propose a fast approximation method that accelerates the computation of PLRA using multiple kd-trees and Lanczos approximation. The basic idea of this method is to exploit an index kd-tree built from patch samples of the observed image and several small kd-trees built from overlapping regions of the image to accelerate the search for similar patches, and apply the Lanczos bidiagonalization procedure to obtain a fast low-rank approximation of patch matrix without computing the full SVD. Experimental results on image denoising and inpainting tasks demonstrate the efficiency and accuracy of our method.
© 2020 Elsevier Inc.
Number of references:50
Main heading:Image reconstruction
Controlled terms:Approximation theory - Conservation - Image denoising - Nearest neighbor search - Restoration - Singular value decomposition
Uncontrolled terms:Approximate nearest neighbors (ANN) - Computational costs - Fast approximation - Low rank approximations - Overlapping regions - Search Algorithms - Singular values - Truncated singular value decomposition
Classification code:716.1 Information Theory and Signal Processing - 921 Mathematics
DOI:10.1016/j.ins.2020.12.066
Funding text:The authors would like to thank Prof. Jiaye Wang with Shandong University, Prof. Wenping Wang with the University of Hong Kong, and the anonymous reviewers for their insightful comments and suggestions that are helpful to improve the quality of this paper. This work was supported by National Natural Science Foundation of China (61873145, 61802229), NSFC Joint Fund with Zhejiang under Key Project (U1609218), Natural Science Foundation of Shandong Province for Excellent Young Scholars (ZR2017JL029), Natural Science Foundation of Shandong Province (ZR2018BF007), and Science and Technology Innovation Program for Distinguished Young Scholars of Shandong Province Higher Education Institutions (2019KJN045).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210709910822
Title:Data augmentation and spectral structure features for limited samples hyperspectral classification????(Open Access)
Authors:Wang, Wenning (1, 2, 3, 4); Liu, Xuebin (1, 3); Mou, Xuanqin (2)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology of CAS, Xiʹan Institute of Optics and Precision Mechanics, CAS, Xi’an; 710119, China; (2) Faculty of Electronic and Information Engineering, Xiʹan Jiaotong University, Xi’an; 710049, China; (3) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing; 100049, China; (4) School of Information Science and Engineering, Shandong Agricultural University, Taiʹan, Shandong, China
Corresponding author:Wang, Wenning(wwn812@stu.xjtu.edu.cnemailwwn812@stu.xjtu.edu.cnemailwwn812@stu.xjtu.edu.cnemailwwn812@stu.xjtu.edu.cn)Wang, Wenning(wwn812@stu.xjtu.edu.cnemailwwn812@stu.xjtu.edu.cnemailwwn812@stu.xjtu.edu.cn)Wang, Wenning(wwn812@stu.xjtu.edu.cnemailwwn812@stu.xjtu.edu.cn)Wang, Wenning(wwn812@stu.xjtu.edu.cn)
Source title:Remote Sensing
Abbreviated source title:Remote Sens.
Volume:13
Issue:4
Issue date:February 2, 2021
Publication year:2021
Pages:1-23
Article number:547
Language:English
E-ISSN:20724292
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:For both traditional classification and current popular deep learning methods, the limited sample classification problem is very challenging, and the lack of samples is an important factor affecting the classification performance. Our work includes two aspects. First, the unsupervised data augmentation for all hyperspectral samples not only improves the classification accuracy greatly with the newly added training samples, but also further improves the classification accuracy of the classifier by optimizing the augmented test samples. Second, an effective spectral structure extraction method is designed, and the effective spectral structure features have a better classification accuracy than the true spectral features.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:44
Main heading:Classification (of information)
Controlled terms:Deep learning - Learning systems
Uncontrolled terms:Classification accuracy - Classification performance - Data augmentation - Hyper-spectral classification - Sample classification - Spectral feature - Spectral structure - Unsupervised data
Classification code:716.1 Information Theory and Signal Processing
DOI:10.3390/rs13040547
Funding details: Number: 11701337,61501456, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Funding: This research was funded by Natural Science Foundation of China, grant number. 61501456 and 11701337, and The APC was funded by National Natural Science Foundation of China, grant number.61501456 and 11701337.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20213210735699
Title:Verification study for the mineral and rock identification using multispectral camera of the "Zhurong" Mars Rover on the earth
Title of translation:"祝融号"火星车多光谱相机岩矿类型识别的地面验证研究
Authors:Xie, Juan (1, 2, 3); Yan, Kai (1, 2, 3); Kang, Zhizhong (1, 2, 3); Xu, Xiaojian (1, 2, 3); Xue, Bin (4); Yang, Jianfeng (4); Tao, Jinyou (4)
Author affiliation:(1) School of land science and technology, China University of Geosciences, Beijing; 100083, China; (2) Lunar and Planetary Remote Sensing Exploration Research Center, China University of Geosciences, Beijing; 100083, China; (3) International Cooperative Research Center for Lunar and Planetary Exploration, Center of Space Exploration, Ministry of Education, Beijing; 100083, China; (4) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Kang, Zhizhong(zzkang@cugb.edu.cn)
Source title:Yaogan Xuebao/Journal of Remote Sensing
Abbreviated source title:Yaogan Xuebao/J. Remote Sens.
Volume:25
Issue:7
Issue date:July 25, 2021
Publication year:2021
Pages:1385-1399
Language:Chinese
ISSN:10074619
E-ISSN:20959494
Document type:Journal article (JA)
Publisher:Science Press
Abstract:

China's first autonomous Mars exploration mission probe "Tianwen-1" was successfully launched in July 2020, and the rover of "Tianwen-1" successfully landed on the pre-selected landing area in the southern Utopia Plain of Mars on May 15. After landing on Mars, China's first Mars rover "Zhurong" will carry out inspections and bring the raw scientific data for Chinese Mars exploration. The multispectral camera mounted on the "Zhurong" rover can be used to study the types of mineral and rock near the landing area. Identifying the types of mineral and rock on Mars is of great significance for understanding the Martian atmospheric change, environmental conditions, geological evolution, and future livability. The study in this article selected 18 kinds of common mineral and rock on the surface of Mars, and shot these mineral and rock with the same multispectral camera as on "Zhurong" rover in the earth environment. Then, this study uses the obtained multispectral image carry out the research of mineral and rock identification, hoping to provide guidance for future in-situ identification of mineral and rock on the surface of Mars based on the "Zhurong" multispectral camera data. Considering that 8-band spectral data is not enough to capture the spectral characteristics of all mineral and rock, it will result in fewer mineral and rock identified, this paper uses color features to assist in the identification of mineral and rock. This paper uses band operation based on multispectral image and HSV color feature histogram extraction based on color image to identify different types of mineral and rock. The above method can identify different types of mineral and rock from the perspective of multispectral features and color features. This study collected multispectral images of mineral and rock under three different shooting conditions, and found that the spectral characteristics of mineral and rock may change under different shooting conditions, which will have an impact on mineral and rock identification. The multispectral image data used in this paper was collected under the conditions of the solar elevation angle at about 60 °, the shooting height at 1.8 meters and the shooting angle at about 37°. Under this condition, the research method in this paper has extracted identification indexes of 12 kinds of mineral and rock. The identification indexes corresponding to specific mineral and rock are listed in the article, all results are based on the above shooting condition. The study shows that: using the band operation based on multispectral image, mineral and rock with prominent spectral characteristics under 8 specific bands can be identified; and using color feature histogram extracted from HSV color image, mineral and rock with a relatively concentrated color feature can be identified. In addition, since different shooting conditions will have an impact on the identification of mineral and rock, it is necessary to do the identification research under different conditions in the future.
© 2021, Science Press. All right reserved.
Number of references:26
Main heading:Minerals
Controlled terms:Cameras - Color - Color image processing - Graphic methods - Martian surface analysis - Rocks
Uncontrolled terms:Environmental conditions - Geological evolution - Histogram extraction - Multi-spectral cameras - Multi-spectral image data - Multispectral images - Shooting conditions - Spectral characteristics
Classification code:482.2 Minerals - 741.1 Light/Optics - 742.2 Photographic Equipment
Numerical data indexing:Size 1.80e+00m
DOI:10.11834/jrs.20211065
Funding details: Number: 2019YFE0123300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Supported by National Key Research and Development Program of China (No.2019YFE0123300); Civil Aerospace Technology Advance Research Project of National Defense Science and Engineering (No.D020103); Beijing Science and Technology Project (No.Z191100004319001)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609900584
Title:Erratum: Optical spectroscopic characterizations of laser irradiated olivine grains (Astronomy and Astrophysics (2017) 597 (A50) DOI: 10.1051/0004-6361/201629327)????(Open Access)
Authors:Yang, Yazhou (1); Zhang, Hao (1, 2); Wang, Ziwei (1); Yuan, Ye (1); Li, Shaolin (3); Hsu, Weibiao (3); Liu, Chujian (4)
Author affiliation:(1) Planetary Science Institute, School of Earth Sciences, China University of Geosciences, Wuhan; 430074, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China; (4) State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan, China
Corresponding author:Yang, Yazhou(yangyazhou1@gmail.comemailum_zhanghao@yahoo.com)Zhang, Hao(um_zhanghao@yahoo.com)
Source title:Astronomy and Astrophysics
Abbreviated source title:Astron. Astrophys.
Volume:646
Issue date:February 1, 2021
Publication year:2021
Article number:C1
Language:English
ISSN:00046361
E-ISSN:14320746
CODEN:AAEJAF
Document type:Erratum (ER)
Publisher:EDP Sciences
Abstract:

This is a corrigendum to Yang et al. (2017). There is a typo in the Fo (Mg-number) of the olivine sample. The Fo is defined as the molar ratio of Mg/(Mg+Fe). The chemical composition values listed in Table 1 are correct, but the calculated Fo# value should be 91. This has no effect on our results or conclusions. The revised table and paragraph are given below, with the revised parts highlighted in bold. (Table Presented.).
© 2021 EDP Sciences. All rights reserved.
DOI:10.1051/0004-6361/201629327e

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.ErratuFlg:613867031

Open Access type(s): All Open Access, Bronze

Accession number:20213410810670
Title:Influence of Channel Center Wavelength Shift of the Hyperspectral Remote Sensor on Red Edge Spectra
Title of translation:高光谱遥感器通道中心波长漂移对红边光谱的影响
Authors:Zhang, Yaqiong (1); Zhang, Wenjuan (2); Chen, Zhengchao (2); Li, Haiwei (3)
Author affiliation:(1) Key Laboratory of Satellite Remote Sensing for National Environmental Protection, Center for Satellite Application on Ecology and Environment, Ministry of Ecology and Environment, Beijing; 100094, China; (2) Airborne Remote Sensing Center, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100094, China; (3) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Li, Haiwei(lihaiwei@opt.ac.cn)
Source title:Guangxue Xuebao/Acta Optica Sinica
Abbreviated source title:Guangxue Xuebao
Volume:41
Issue:14
Issue date:July 25, 2021
Publication year:2021
Article number:1428003
Language:Chinese
ISSN:02532239
CODEN:GUXUDC
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

We simulated the reflectance of typical vegetation in the red-edge region before and after the channel center wavelength shift of hyperspectral remote sensors to quantitatively examine the effect of the channel center wavelength shift on the red edge spectra. The results show that the channel center wavelength shift leads to many "spike" and "shake" phenomena in the reflectance curves of the red-edge region, and the reflectance curves in the region without characteristic absorption become unsmooth. Moreover, there is a significant linear relationship between the channel center wavelength shift and the red edge position (REP) error (coefficient of determination R2=0.99). For a 10 nm hyperspectral remote sensor, when the channel center wavelength shifts are 1 nm, 3 nm, and 5 nm, the maximum errors in red-edge reflectance are 1.46%, 4.49%, and 9.57%, respectively, and the red edge spectra have the obvious "blue shift" phenomenon, with the REP shifting by 0.75 nm, 2.60 nm, and 5.52 nm, respectively. The channel center wavelength shift will lead to the pseudo-shift of the red edge or cause the "covering" or "strengthening" effect on the red edge shift induced by vegetation stress, which will directly affect the monitoring accuracy of vegetation stress based on hyperspectral remote sensing data. Channel center wavelength shift is an important source of the red edge shift. Accurate spectral calibration is the important basis of quantitative application related to the red edge spectra of vegetation.
© 2021, Chinese Lasers Press. All right reserved.
Number of references:24
Main heading:Red Shift
Controlled terms:Blue shift - Reflection - Remote sensing - Vegetation
Uncontrolled terms:Characteristic absorption - Coefficient of determination - Hyperspectral remote sensing data - Linear relationships - Monitoring accuracy - Red edge reflectance - Spectral calibration - Vegetation stress
Numerical data indexing:Percentage 1.46e+00%, Percentage 4.49e+00%, Percentage 9.57e+00%, Size 1.00e-08m, Size 1.00e-09m, Size 2.60e-09m, Size 3.00e-09m, Size 5.00e-09m, Size 5.52e-09m, Size 7.50e-10m
DOI:10.3788/AOS202141.1428003

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910320664
Title:Effects of secondary electron emission yield properties on gain and timing performance of ALD-coated MCP
Authors:Guo, Lehui (1, 2, 3); Xin, Liwei (1, 3); Li, Lili (1, 2, 3); Gou, Yongsheng (1); Sai, Xiaofeng (1); Li, Shaohui (1); Liu, Hulin (1); Xu, Xiangyan (1); Liu, Baiyu (1); Gao, Guilong (1); He, Kai (1); Zhang, Mingrui (1); Qu, Youshan (1); Xue, Yanhua (1); Wang, Xing (1); Chen, Ping (1, 3, 4); Tian, Jinshou (1, 3)
Author affiliation:(1) Key Laboratory of Ultra-fast photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (4) Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai; 200240, China
Corresponding author:Chen, Ping(chenping@opt.cn)
Source title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Abbreviated source title:Nucl Instrum Methods Phys Res Sect A
Volume:1005
Issue date:July 21, 2021
Publication year:2021
Article number:165369
Language:English
ISSN:01689002
CODEN:NIMAER
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

The technology of atomic layer deposition has been used to improve the lifetime of the microchannel plate-photomultiplier tube (MCP-PMT) effectively and makes MCP possible to choose to coat different potential emissive materials on the internal surface of the MCP channels in the future. However, it is still an open question to what extent the secondary electron emission (SEE) yield properties of the emissive materials influence the behavior of the ALD-coated MCP. In this work, the dependences of the gain and timing performance on the SEE yield properties were assessed by using the Monte Carlo and particle-in-cell methods. We established the three-dimensional MCP single channel model in Computer Simulation Technology (CST) Particle Studio. Three important secondary electron emissions, the backscattered, rediffused and true SEEs, were discussed numerically based on the probabilistic model. The secondary electron cascade processes in the MCP single channel were simulated. The simulation results indicate that the opportunities for improving the gain of the ALD-coated MCP by improving the SEE yields corresponding to the incident energies of 0 eV–100 eV. The backscattered and rediffused electrons are found to have strong effects on the gain and timing performance of the MCP. Although the higher the SEE yield the higher the MCP gain, the drawback is the extremely high SEE yield will make the MCP saturated prematurely and degrade the time resolution. The simulation results will be used to guide the design and selection of emissive material for ALD-coated MCP development.
© 2021 Elsevier B.V.
Number of references:21
Main heading:Image storage tubes
Controlled terms:Anodes - Atomic layer deposition - Atoms - Microchannels - Monte Carlo methods - Photomultipliers - Secondary emission - Timing circuits
Uncontrolled terms:Electron emission yields - Emissive materials - Gain - Gain performance - Micro channel plate - Microchannel plate - Secondary electron emission yield - Secondary electron emissions - Timing performance - Yield properties
Classification code:713.4 Pulse Circuits - 714.1 Electron Tubes - 813.1 Coating Techniques - 922.2 Mathematical Statistics - 931.3 Atomic and Molecular Physics - 933.1.2 Crystal Growth
Numerical data indexing:Electron volt 0.00E00eV, Electron volt 1.00E+02eV
DOI:10.1016/j.nima.2021.165369
Funding details: Number: -, Acronym: MOE, Sponsor: Ministry of Education of the People's Republic of China;Number: -, Acronym: SJTU, Sponsor: Shanghai Jiao Tong University;Number: XDA25030900,GJJSTD20190004, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 12075311,11805267, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work is supported by National Natural Science Foundation of China (Grant No. 11805267 and 12075311 ), the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. GJJSTD20190004 ), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA25030900 ) and Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, China .

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212210426952
Title:Optimal optical path difference of an asymmetric common-path coherent-dispersion spectrometer
Authors:Chen, Shasha (1, 2, 3); Wei, Ruyi (1, 3, 4); Xie, Zhengmao (3); Wu, Yinhua (5); Di, Lamei (1, 3); Wang, Feicheng (1, 3); Zhai, Yang (6, 7)
Author affiliation:(1) CAS Key Laboratory of Spectral Imaging Technology, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an Institute of Optics Precision and Mechanic of Chinese Academy of Sciences, Xi'an; 710119, China; (4) Electronic Information School, Wuhan University, Wuhan; 430072, China; (5) School of Optoelectronics Engineering, Xi'an Technological University, Xi'an; 710021, China; (6) National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing; 210042, China; (7) Key Laboratory of Astronomical Optics and Technology, Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing; 210042, China
Corresponding author:Wei, Ruyi(ruyiwei@opt.ac.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:16
Issue date:June 1, 2021
Publication year:2021
Pages:4535-4543
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Optical path difference (OPD) is a very significant parameter in the asymmetric common-path coherent-dispersion spectrometer (CODES), which directly determines the performance of the CODES. In order to improve the performance of the instrument as much as possible, a temperature-compensated optimal optical path difference (TOOPD) method is proposed. The method does not only consider the influence of temperature change on the OPD but also effectively solves the problem that the optimal OPD cannot be obtained simultaneously at different wavelengths. Taking the spectral line with a Gaussian-type power spectral density distribution as a representative, the relational expression between the OPD and the visibility of interference fringes formed by the CODES is derived for the stellar absorption/emission line. Further, the optimal OPD is deduced according to the efficiency function, and the relationship between the optimalOPDand wavelength is analyzed. Then, based on the materials' dispersion characteristics, different optical materials are combined and added to the interferometer's reflected and transmitted optical path to implement the optimalOPDat different wavelengths, thereby improving the detection precision. Meanwhile, the materials whose refractive index negatively changes with temperature are selected to reduce or even offset the temperature impact on OPD, and hence the system's stability is improved and further improves the detection precision. Under certain input conditions, the material combination that approximates the optimal OPD is performed within the range of 0.66-0.9 μm. The simulation results show that the maximal difference between the optimal OPD obtained by the efficiency function and the OPD produced by the material combination is 0.733 mm for the absorption line and 1.122 mm for the emission line, which is reduced by 1 time compared with only one material. The influence of temperature on the OPD can be reduced by 2-3 orders of magnitude by material combination, which greatly ameliorates the stability of the whole spectrometer. Hence, the TOOPD method provides a new idea for further improving the high-precision radial velocity detection of the asymmetric common-pathCODES.
©2021 Optical Society of America.
Number of references:24
Main heading:Dispersion (waves)
Controlled terms:Efficiency - Refractive index - Spectral density - Spectrometers
Uncontrolled terms:Dispersion characteristics - Dispersion spectrometers - Efficiency functions - Material combination - Optical path difference - System's stabilities - Temperature compensated - Visibility of interference fringes
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 913.1 Production Engineering
Numerical data indexing:Size 1.12e-03m, Size 6.60e-07m to 9.00e-07m, Size 7.33e-04m
DOI:10.1364/AO.425491

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310151075
Title:Scalable wide neural network: A parallel, incremental learning model using splitting iterative least squares????(Open Access)
Authors:Xi, Jiangbo (1, 2); Ersoy, Okan K. (3); Fang, Jianwu (4); Cong, Ming (1, 2); Wei, Xin (5, 6); Wu, Tianjun (7)
Author affiliation:(1) College of Geological Engineering and Geomatics, Chang'an University, Xi'an; 710054, China; (2) Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an; 710054, China; (3) School of Electrical and Computer Engineering, Purdue University, West Lafayette; IN; 47907, United States; (4) College of Transportation Engineering, Chang'an University, Xi'an; 710064, China; (5) Xi'an Institute of Optics and Precision Mechanics, Cas, Xi'an; 710119, China; (6) School of Electronic Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing; 100039, China; (7) Department of Mathematics and Information Science, College of Science, Chang'an University, Xi'an; 710064, China
Corresponding author:Ersoy, Okan K.(ersoy@purdue.eduemailfangjianwu@chd.edu.cn)Fang, Jianwu(fangjianwu@chd.edu.cn)
Source title:IEEE Access
Abbreviated source title:IEEE Access
Volume:9
Issue date:2021
Publication year:2021
Pages:50767-50781
Article number:9386084
Language:English
E-ISSN:21693536
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

With the rapid development of research on machine learning models, especially deep learning, more and more endeavors have been made on designing new learning models with properties such as fast training with good convergence, and incremental learning to overcome catastrophic forgetting. In this paper, we propose a scalable wide neural network (SWNN), composed of multiple multi-channel wide RBF neural networks (MWRBF). The MWRBF neural network focuses on different regions of data and nonlinear transformations can be performed with Gaussian kernels. The number of MWRBFs for proposed SWNN is decided by the scale and difficulty of learning tasks. The splitting and iterative least squares (SILS) training method is proposed to make the training process easy with large and high dimensional data. Because the least squares method can find pretty good weights during the first iteration, only a few succeeding iterations are needed to fine tune the SWNN. Experiments were performed on different datasets including gray and colored MNIST data, hyperspectral remote sensing data (KSC, Pavia Center, Pavia University, and Salinas), and compared with main stream learning models. The results show that the proposed SWNN is highly competitive with the other models.
© 2013 IEEE.
Number of references:53
Main heading:Learning systems
Controlled terms:Clustering algorithms - Data streams - Deep learning - Iterative methods - Least squares approximations - Mathematical transformations - Radial basis function networks - Remote sensing
Uncontrolled terms:Catastrophic forgetting - High dimensional data - Hyperspectral remote sensing data - Incremental learning - Iterative least squares - Least squares methods - Non-linear transformations - RBF Neural Network
Classification code:903.1 Information Sources and Analysis - 921.3 Mathematical Transformations - 921.6 Numerical Methods
DOI:10.1109/ACCESS.2021.3068880
Funding details: Number: 41874005,61806022, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 201404910404, Acronym: CSC, Sponsor: China Scholarship Council;Number: SKLGIE 2018-M-3-4, Acronym: SKLGIE, Sponsor: State Key Laboratory of Geo-Information Engineering;Number: 2018YFC1504805, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 300102260301,300102260404,300102269103,300102269304, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work was supported in part by the National Key Research and Development Program of China under Grant 2018YFC1504805; in part by the National Natural Science Foundation of China under Grant 61806022 and Grant 41874005; in part by the State Key Laboratory of Geo-Information Engineering under Grant SKLGIE 2018-M-3-4; in part by the Fundamental Research Funds for the Central Universities under Grant 300102269103, Grant 300102269304, Grant 300102260301, and Grant 300102260404; and in part by the China Scholarship Council (CSC) through Scholarship under Grant 201404910404.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211410166776
Title:A motor imagery EEG signal classification algorithm based on recurrence plot convolution neural network
Authors:Meng, XianJia (1); Qiu, Shi (2); Wan, Shaohua (3); Cheng, Keyang (4); Cui, Lei (1)
Author affiliation:(1) School of Information Science and Technology, Northwest University, Xi 'an; 710027, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan; 430073, China; (4) School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang; 212000, China
Corresponding author:Qiu, Shi
Source title:Pattern Recognition Letters
Abbreviated source title:Pattern Recogn. Lett.
Volume:146
Issue date:June 2021
Publication year:2021
Pages:134-141
Language:English
ISSN:01678655
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

With the promotion of brain-computer interface technology, it is possible to study brain control system through EEG signals in recent years. In order to solve the problem of EEG signal classification effectively, a motor imagery classification algorithm based on recurrence plot convolution neural network is proposed. Firstly, EEG signals are preprocessed to enhance the signal intensity in the exercise interval. Secondly, time-domain and frequency-domain features are extracted respectively to construct the feature mode of recurrence plot. Finally, a new neural network is established to realize the accurate recognition of left and right movements. This research can also be transferred to other research fields.
© 2021 Elsevier B.V.
Number of references:36
Main heading:Classification (of information)
Controlled terms:Biomedical signal processing - Brain computer interface - Computer control systems - Convolution - Frequency domain analysis - Image classification
Uncontrolled terms:Brain controls - Classification algorithm - Convolution neural network - EEG signals - EEG signals classification - Interface technology - Motor imagery - Motor imagery classification - Motor imagery EEG - Recurrence plot
Classification code:716.1 Information Theory and Signal Processing - 722.2 Computer Peripheral Equipment - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 731.1 Control Systems - 903.1 Information Sources and Analysis - 921.3 Mathematical Transformations
DOI:10.1016/j.patrec.2021.03.023
Funding details: Number: 2020M682144, Acronym: -, Sponsor: Postdoctoral Science Foundation of Guangxi Province of China;Number: 61702416, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work is supported by Postdoctoral Science Foundation of China (Grant No. 2020M682144). National Natural Science Foundation of China (Grant No. 61702416).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710243682
Title:Determination of the antibiotic minocycline by integrated optofluidic microstructured polymer optical fiber chemiluminescence
Authors:Li, Zhanao (1); Yang, Xinghua (1); Teng, Pingping (1); Kong, Depeng (2); Gao, Shuai (1); Liu, Zhihai (1); Yang, Jun (1, 3); Gao, Danheng (1); Luo, Meng (1); Wen, Xingyue (1); Yuan, Libo (1, 4); Li, Kang (5); Bowkett, Mark (5); Copner, Nigel (5)
Author affiliation:(1) Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, Harbin, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanic, Chinese Academy of Sciences, Xi’an, China; (3) Guangdong Provincial Key Laboratory of Photonics Information Technology, Advanced Institute of Photonic Technology and the School of Information Engineering of Guangdong University of Technology, Guangzhou, China; (4) Photonics Research Center, Guilin University of Electronics Technology, Guilin, China; (5) Wireless & Optoelectronics Research & Innovation Centre, Faculty of Computing, Engineering & Science, University of South Wales, United Kingdom
Corresponding author:Yang, XinghuaTeng, Pingping
Source title:Instrumentation Science and Technology
Abbreviated source title:Instrum Sci Technol
Issue date:2021
Publication year:2021
Language:English
ISSN:10739149
E-ISSN:15256030
CODEN:ISCTEF
Document type:Article in Press
Publisher:Bellwether Publishing, Ltd.
Abstract:

An in-fiber optofluidic chemiluminescence (CL) device is reported based on a low-cost microstructured polymer optical fiber (mPOF). The mPOF is composed of a central hole for liquid delivery and a suspended core for optical coupling. Due to the lower processing temperature of mPOF, the difficulty of constructing microfluidic channels is greatly reduced. In addition, the large core diameter of mPOF is more conducive to optical coupling. The microholes are opened on the surface of the mPOF by partial melting to complete the construction of the microfluidic channel. Simultaneously, the response of the CL reaction is detected on-line by the optoelectronic device. Minocycline (MC) was employed as the analyte for on-line optofluidic CL detection. The results show that the device detects aqueous minocycline from 0.0001 to 0.1 g/L with a linear response between 0.001 and 0.01 g/L. The limit of detection is 0.0001 g/L. Moreover, the ability of the device to detect minocycline in blood serum is investigated. The relative deviation from the linear calibration value is within 3.2%. Furthermore, the low-cost in-fiber optofluidic CL device may be integrated with other devices and offers potential in drug safety and medical detection.
© 2021 Taylor & Francis Group, LLC.
Number of references:34
Main heading:Fibers
Controlled terms:Chemiluminescence - Costs - Fluidic devices - Microfluidics - Microstructure - Optoelectronic devices - Plastic optical fibers - Processing
Uncontrolled terms:Limit of detection - Linear calibration - Microfluidic channel - Microstructured polymer optical fibers - Microstructured polymer optical fibers (mPOF) - Optical couplings - Processing temperature - Relative deviations
Classification code:632.2 Hydraulic Equipment and Machinery - 632.5.1 Microfluidics - 741 Light, Optics and Optical Devices - 911 Cost and Value Engineering; Industrial Economics - 913.4 Manufacturing - 951 Materials Science
Numerical data indexing:Mass_Density 1.00e-03kg/m3 to 1.00e-02kg/m3, Mass_Density 1.00e-04kg/m3 to 1.00e-01kg/m3, Mass_Density 1.00e-04kg/m3, Percentage 3.20e+00%
DOI:10.1080/10739149.2021.1912761

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210809951145
Title:Sub-7 fs radially-polarized pulses by post-compression in thin fused silica plates????(Open Access)
Authors:Cao, Huabao (1, 2); Nagymihaly, Roland S. (1); Khodakovskiy, Nikita (1); Pajer, Viktor (1); Bohus, Janos (1); Lopez-Martens, Rodrigo (1, 3); Borzsonyi, Adam (1); Kalashnikov, Mikhail (1, 4)
Author affiliation:(1) ELI-ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner u. 3, Szeged; 6728, Hungary; (2) Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (3) Laboratoire d’Optique Appliquée, CNRS, Ecole Polytechnique, ENSTA Paris, Institut Polytechnique deParis, 181 chemin de la Hunière et des Joncherettes, Palaiseau; 91120, France; (4) Max-Born-Institut for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Starsse 2a, Berlin; 12489, Germany
Corresponding author:Cao, Huabao(caohuabao@opt.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:4
Issue date:February 15, 2021
Publication year:2021
Pages:5915-5922
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:OSA - The Optical Society
Abstract:We experimentally demonstrate the post-compression of radially polarized 25 fs pulses at 800 nm central wavelength in a multiple thin plate arrangement for the first time, to the best of our knowledge. Sub-7 fs pulses with 90 µJ energy were obtained after dispersion compensation, corresponding to a compression factor of more than 3.5. Preservation of radial polarization state was confirmed by polarized intensity distribution measurements. Linear projections of the radially polarized pulses were also fully characterized in the temporal domain.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Number of references:24
Main heading:Fused silica
Controlled terms:Optical constants - Optics
Uncontrolled terms:Central wavelength - Compression factor - Fused silica plates - Intensity distribution - Linear projections - Post compressions - Radial polarization - Radially polarized
Classification code:741.1 Light/Optics - 812.3 Glass
Numerical data indexing:Size 8.00e-07m, Time 2.50e-14s
DOI:10.1364/OE.416201
Funding details: Number: -, Acronym: EC, Sponsor: European Commission;Number: -, Acronym: FEDER, Sponsor: European Regional Development Fund;
Funding text:Acknowledgments. The authors thank Jérôme Faure for the loan of the four-segment waveplate and Amplitude Technologies for the support on the laser source. The ELI-ALPS project (GINOP-2.3.6-15-2015-00001) is supported by the European Union and co-financed by the European Regional Development Fund.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212110381761
Title:A framework of modelling slip-controlled crack growth in polycrystals using crystal plasticity and XFEM????(Open Access)
Authors:Zhang, P. (1, 2); Lu, S. (1); Baxevanakis, K.P. (2); Zhao, L.G. (2, 3, 4); Yu, T.Y. (5); Zhou, R.X. (6)
Author affiliation:(1) School of Power and Energy, Northwestern Polytechnical University, Xi'an; 710129, China; (2) Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, United Kingdom; (3) College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing; , 210016, China; (4) School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan; 056038, China; (5) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (6) School of Civil Engineering, Hefei University of Technology, Hefei; 23009, China
Corresponding author:Lu, S.(shanlu@nwpu.edu.cn)
Source title:Journal of Physics: Conference Series
Abbreviated source title:J. Phys. Conf. Ser.
Volume:1885
Part number:4 of 5
Issue:4
Issue title:2021 7th International Conference on Manufacturing Technology and Applied Materials, ICAMMT 2021 - 3. Intelligent Mechanical Technology and Automated Manufacturing Process
Issue date:April 28, 2021
Publication year:2021
Article number:042014
Language:English
ISSN:17426588
E-ISSN:17426596
Document type:Conference article (CA)
Conference name:2021 7th International Conference on Manufacturing Technology and Applied Materials, ICAMMT 2021
Conference date:March 26, 2021 - March 28, 2021
Conference location:Sanya, China
Conference code:168830
Publisher:IOP Publishing Ltd
Abstract:

Short cracks tend to develop at high and irregular rates compared to macroscopic cracks, making the prediction of fatigue life a challenging task. In this work, a numerical framework combining crystal plasticity model and the Extended Finite Element Method (XFEM) is applied to study the slip-controlled short crack growth in a polycrystal superalloy RR1000. The model is calibrated from experiments and used to evaluate short crack growth paths and rates. Two fracture criteria are used and compared: The onset of fracture is controlled by the total and individual cumulative shear strain respectively, and the crack grows either perpendicular to the direction of maximum principal strain or along crystallographic directions.
© Published under licence by IOP Publishing Ltd.
Number of references:6
Main heading:Cracks
Controlled terms:Crack propagation - Manufacture - Numerical methods - Plastic deformation - Plasticity - Polycrystals - Shear strain
Uncontrolled terms:Crystal plasticity - Crystal plasticity models - Crystallographic directions - Extended finite element method - Macroscopic cracks - Maximum principal strain - Polycrystal superalloys - Prediction of fatigue lives
Classification code:537.1 Heat Treatment Processes - 921.6 Numerical Methods - 931.1 Mechanics - 933.1 Crystalline Solids - 951 Materials Science
DOI:10.1088/1742-6596/1885/4/042014
Funding details: Number: EP/K026844/1,EP/M000966/1, Acronym: EPSRC, Sponsor: Engineering and Physical Sciences Research Council;Number: 201806290092, Acronym: CSC, Sponsor: China Scholarship Council;
Funding text:P. Zhang would like to acknowledge the support from the China Scholarship Council (CSC, No. 201806290092). The work was also funded by the EPSRC (Grant EP/M000966/1 and EP/K026844/1) of the UK.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze, Green

Accession number:20204709509999
Title:The ensemble deep learning model for novel COVID-19 on CT images????(Open Access)
Authors:Zhou, Tao (1, 3); Lu, Huiling (2); Yang, Zaoli (4); Qiu, Shi (5); Huo, Bingqiang (1); Dong, Yali (1)
Author affiliation:(1) School of Computer Science and Engineering, North minzu University, Yinchuan; 750021, China; (2) School of Science, Ningxia Medical University, Yinchuan; 750004, China; (3) Ningxia Key Laboratory of Intelligent Information and Big Data Processing, Yinchuan; 750021, China; (4) College of Economics and Management, Beijing University of Technology, Beijing; 100124, China; (5) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Lu, Huiling
Source title:Applied Soft Computing
Abbreviated source title:Appl. Soft Comput.
Volume:98
Issue date:January 2021
Publication year:2021
Article number:106885
Language:English
ISSN:15684946
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:The rapid detection of the novel coronavirus disease, COVID-19, has a positive effect on preventing propagation and enhancing therapeutic outcomes. This article focuses on the rapid detection of COVID-19. We propose an ensemble deep learning model for novel COVID-19 detection from CT images. 2933 lung CT images from COVID-19 patients were obtained from previous publications, authoritative media reports, and public databases. The images were preprocessed to obtain 2500 high-quality images. 2500 CT images of lung tumor and 2500 from normal lung were obtained from a hospital. Transfer learning was used to initialize model parameters and pretrain three deep convolutional neural network models: AlexNet, GoogleNet, and ResNet. These models were used for feature extraction on all images. Softmax was used as the classification algorithm of the fully connected layer. The ensemble classifier EDL-COVID was obtained via relative majority voting. Finally, the ensemble classifier was compared with three component classifiers to evaluate accuracy, sensitivity, specificity, F value, and Matthews correlation coefficient. The results showed that the overall classification performance of the ensemble model was better than that of the component classifier. The evaluation indexes were also higher. This algorithm can better meet the rapid detection requirements of the novel coronavirus disease COVID-19.
© 2020 Elsevier B.V.
Number of references:34
Main heading:Deep learning
Controlled terms:Backpropagation - Biological organs - Computerized tomography - Convolutional neural networks - Deep neural networks - Learning systems - Transfer learning
Uncontrolled terms:Classification algorithm - Classification performance - Component classifiers - Correlation coefficient - Ensemble classifiers - Ensemble modeling - High quality images - Therapeutic outcomes
Classification code:461.2 Biological Materials and Tissue Engineering - 723.4 Artificial Intelligence - 723.5 Computer Applications
DOI:10.1016/j.asoc.2020.106885
Funding details: Number: 62062003, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020KYQD08, Acronym: MNU, Sponsor: North Minzu University;
Funding text:This work is supported by Natural Science Foundation of China (Grant No. 62062003 ), North Minzu University Research Project of Talent Introduction, China (No. 2020KYQD08 ).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20211810301185
Title:Arbitrary Phase Access for Stable Fiber Interferometers????(Open Access)
Authors:Roztocki, Piotr (1, 2); MacLellan, Benjamin (1); Islam, Mehedi (1); Reimer, Christian (1, 3); Fischer, Bennet (1); Sciara, Stefania (1, 4); Helsten, Robin (1); Jestin, Yoann (1, 2); Cino, Alfonso (4); Chu, Sai T. (5); Little, Brent (6); Moss, David J. (7); Kues, Michael (1, 8); Morandotti, Roberto (1, 9)
Author affiliation:(1) Institut National de la Recherche Scientifique (INRS-EMT), Varennes; QC, Canada; (2) Ki3 Photonics Technologies, Montreal; QC, Canada; (3) HyperLight Corporation, Cambridge; MA, United States; (4) Department of Engineering, University of Palermo, Palermo, Italy; (5) Department of Physics and Material Science, City University of Hong Kong, Hong Kong; (6) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (7) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC, Australia; (8) Institute of Photonics, Leibniz University of Hannover, Hannover, Germany; (9) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China
Corresponding author:Kues, Michael(michael.kues@iop.uni-hannover.deemailmorandotti@emt.inrs.ca)Morandotti, Roberto(morandotti@emt.inrs.ca)
Source title:Laser and Photonics Reviews
Abbreviated source title:Laser Photon. Rev.
Volume:15
Issue:7
Issue date:July 2021
Publication year:2021
Article number:2000524
Language:English
ISSN:18638880
E-ISSN:18638899
Document type:Journal article (JA)
Publisher:John Wiley and Sons Inc
Abstract:

Well-controlled yet practical systems that give access to interference effects are critical for established and new functionalities in ultrafast signal processing, quantum photonics, optical coherence characterization, etc. Optical fiber systems constitute a central platform for such technologies. However, harnessing optical interference in a versatile and stable manner remains technologically costly and challenging. Here, degrees of freedom native to optical fibers, i.e., polarization and frequency, are used to demonstrate an easily deployable technique for the retrieval and stabilization of the relative phase in fiber interferometric systems. The scheme gives access (without intricate device isolation) to <1.3 × 10−3 π rad error signal Allan deviation across 1 ms to 1.2 h integration times for all tested phases, ranging from 0 to 2π. More importantly, the phase-independence of this stability is shown across the full 2π range, granting access to arbitrary phase settings, central for, e.g., performing quantum projection measurements and coherent pulse recombination. Furthermore, the scheme is characterized with attenuated optical reference signals and single-photon detectors, and extended functionality is demonstrated through the use of pulsed reference signals (allowing time-multiplexing of both main and reference signals). Finally, the scheme is used to demonstrate radiofrequency-controlled interference of high-dimensional time-bin entangled states.
© 2021 The Authors. Laser & Photonics Reviews published by Wiley-VCH GmbH
Number of references:54
Main heading:Signal processing
Controlled terms:Degrees of freedom (mechanics) - Optical fibers - Particle beams - Photons - Quantum entanglement
Uncontrolled terms:Fiber interferometers - Interference effects - Interferometric system - Optical fiber systems - Optical reference signals - Reference signals - Single-photon detectors - Ultrafast signal processing
Classification code:716.1 Information Theory and Signal Processing - 741.1.2 Fiber Optics - 931 Classical Physics; Quantum Theory; Relativity - 932.1 High Energy Physics
Numerical data indexing:Time 1.00e-03s to 4.32e+03s
DOI:10.1002/lpor.202000524
Funding details: Number: 9610356, Acronym: -, Sponsor: -;Number: 656607, Acronym: MSCA, Sponsor: H2020 Marie Sk&lstrok;odowska-Curie Actions;Number: -, Acronym: MESI, Sponsor: Ministère de l'Économie, de la Science et de l'Innovation - Québec;Number: -, Acronym: NSERC, Sponsor: Natural Sciences and Engineering Research Council of Canada;Number: DP150104327, Acronym: ARC, Sponsor: Australian Research Council;Number: -, Acronym: -, Sponsor: Canada Research Chairs;Number: XDB24030300, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: Horizon 2020;
Funding text:P.R. and B.M. contributed equally to this work. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Steacie, Synergy, Strategic, Discovery and Acceleration Grants Schemes, by the MESI PSR-SIIRI Initiative in Quebec, by the Canada Research Chair Program, and by the Australian Research Council Discovery Projects scheme (DP150104327). P.R. and C.R. acknowledge the support of NSERC Vanier Canada Graduate Scholarships. B.M. acknowledges support provided by an NSERC CGS-M fellowship. M.K. acknowledges funding from the European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie grant agreement number 656607. S.T.C. acknowledges support from the CityU APRC programme number 9610356. B.L. acknowledges support from the Strategic Priority Research Program of the Chinese Academy of Sciences (grant number XDB24030300). R.M. is affiliated to the Institute of Fundamental and Frontier Sciences as an adjoint professor. The authors thank J. Aza?a for providing some of the required equipment and S. MacLean as well as H. Eisenberg for useful discussions. Special thanks go to Quantum Opus and N. Bertone of OptoElectronic Components for their continuous support and for providing state-of-the-art photon detection equipment. Open access funding enabled and organized by Projekt DEAL.P.R. and B.M. contributed equally to this work. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Steacie, Synergy, Strategic, Discovery and Acceleration Grants Schemes, by the MESI PSR‐SIIRI Initiative in Quebec, by the Canada Research Chair Program, and by the Australian Research Council Discovery Projects scheme (DP150104327). P.R. and C.R. acknowledge the support of NSERC Vanier Canada Graduate Scholarships. B.M. acknowledges support provided by an NSERC CGS‐M fellowship. M.K. acknowledges funding from the European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska‐Curie grant agreement number 656607. S.T.C. acknowledges support from the CityU APRC programme number 9610356. B.L. acknowledges support from the Strategic Priority Research Program of the Chinese Academy of Sciences (grant number XDB24030300). R.M. is affiliated to the Institute of Fundamental and Frontier Sciences as an adjoint professor. The authors thank J. Azaña for providing some of the required equipment and S. MacLean as well as H. Eisenberg for useful discussions. Special thanks go to Quantum Opus and N. Bertone of OptoElectronic Components for their continuous support and for providing state‐of‐the‐art photon detection equipment.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Hybrid Gold, Green

Accession number:20213710888744
Title:Hyperspectral anomaly detection via super-resolution reconstruction with an attention mechanism
Authors:Chong, Dan (1, 2); Hu, Bingliang (1); Gao, Hao (3); Gao, Xiaohui (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, No. 17 Xinxi Road, Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The Key Laboratory of Network Data Science and Technology, Institute of Computing Technology, Chinese Academy of Sciences, No. 6 KeXueYuan South Road, Haidian District, Beijing; 100190, China
Corresponding author:Gao, Xiaohui(gaoxhui@163.com)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:26
Issue date:September 10, 2021
Publication year:2021
Pages:8109-8119
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Hyperspectral anomaly detection aims to classify the anomalous objects in the scene. However, the spatial resolution of the hyperspectral images is relatively low, leading to inaccurate detection of abnormal pixels. Existing methods either ignore the low-resolution problem or leverage super-resolution models to reconstruct the global image to detect abnormal pixels.We claim that reconstructing super-resolution of the global image is unnecessary, while the area where the abnormal target is located should be paid more attention to be reconstructed. In this paper, we propose a super-resolution reconstruction with an attention mechanism for hyperspectral anomaly detection. Our method can automatically extract additional high-frequency information from low-spatial-resolution images and detect abnormal pixels simultaneously. Furthermore, the spatial-channel attention mechanism is adopted to select significant features for reconstructing super-resolution images by assigning different weights to different channels and different spatial-spectral locations. Finally, a regularized join loss function is proposed that balances different tasks by adjusting the relative weight. The experimental results on the public hyperspectral real datasets demonstrate that the proposed method outperforms the state-of-the-art methods.
© 2021 Optical Society of America.
Number of references:48
Main heading:Anomaly detection
Controlled terms:Image reconstruction - Image resolution - Optical resolving power - Pixels - Spectroscopy
Uncontrolled terms:Attention mechanisms - High-frequency informations - Hyperspectral anomaly detection - Spatial resolution - Spatial resolution images - State-of-the-art methods - Super resolution reconstruction - Super-resolution models
Classification code:741.1 Light/Optics
DOI:10.1364/AO.432704

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710259247
Title:Discriminative Invariant Alignment for Unsupervised Domain Adaptation
Authors:Li, Desheng (1); Lu, Yuwu (2); Wang, Wenjing (3); Lai, Zhihui (4); Zhou, Jie (5); Li, X. (6)
Author affiliation:(1) Computer science school, Shenzhen University, 47890 Shenzhen, Guangdong, China, (e-mail: lidesheng2019@email.szu.edu.cn); (2) Bio-Computing Research Center, Shenzhen Graduate School of Tsinghua University, Shenzhen, Guang Dong, China, 518055 (e-mail: luyuwu2008@163.com); (3) Computer science, Shenzhen University, 47890 Shenzhen, Guangdong, China, (e-mail: wangwenjing2018@email.szu.edu.cn); (4) School of Computer and Software, Shenzhen University, 47890 Shenzhen, Guangdong, China, 518060 (e-mail: lai_zhi_hui@163.com); (5) College of Computer Science and Software Engineering, Shenzhen University, 47890 Shenzhen, Guangdong, China, (e-mail: jie_jpu@163.com); (6) Center for OPTical IMagery Analysis and Learning (OPTIMAL), State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Xi'an, Shaanxi, China, (e-mail: xuelong_li@opt.ac.cn)
Source title:IEEE Transactions on Multimedia
Abbreviated source title:IEEE Trans Multimedia
Issue date:2021
Publication year:2021
Language:English
ISSN:15209210
E-ISSN:19410077
CODEN:ITMUF8
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

As one of the most prevalent branches of transfer learning, domain adaptation is dedicated to generalizing the knowledge of a source domain to a target domain to perform machine learning tasks. In domain adaptation, the key strategy is to overcome the shift between different domains and learn shared features with domain invariance. However, most existing methods focus on extracting the common features of the source and target domains, and do not consider the shift problem of class center in the target domain caused by this process. Specifically, when we align the domain distributions, we often ignore the inherent feature attributes of the data, or under the guidance of false pseudo-labels, cause the target domain data to be far away from the class center after projection. This is not conducive to classification task. To address these problems, in this study, we propose a novel domain adaptation method, referred to as discriminative invariant alignment (DIA), for image representation. DIA enriches the knowledge matrix by combining the class discriminative information of the source domain and local data structure information of the target domain into a new framework. By introducing the maximum margin criterion of the source domain, the classification boundaries are expanded. To verify the performance of the proposed method, we compared DIA with several state-of-the-art methods on five benchmark databases. The experimental results show that DIA is superior to the state-of-the-art methods.
IEEE
Main heading:Alignment
Controlled terms:Benchmarking - Transfer learning
Uncontrolled terms:Benchmark database - Classification boundary - Classification tasks - Domain distribution - Image representations - Maximum margin criterions - State-of-the-art methods - Structure information
Classification code:601.1 Mechanical Devices
DOI:10.1109/TMM.2021.3073258

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510544366
Title:Density saliency for clustered building detection and population capacity estimation
Authors:Liu, Kang (1, 2); Huang, Ju (1, 2); Xu, Mingliang (3); Perc, Matjaž (4); Li, Xuelong (5, 6)
Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Information Engineering, Zhengzhou University, Zhengzhou; 450001, China; (4) Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, Maribor; SI-2000, Slovenia; (5) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; 710072, China; (6) Key Laboratory of Intelligent Interaction and Applications (Northwestern Polytechnical University), Ministry of Industry and Information Technology, Xi'an; 710072, China
Corresponding author:Li, Xuelong(i@nwpu.edu.cn)
Source title:Neurocomputing
Abbreviated source title:Neurocomputing
Volume:458
Issue date:October 7, 2021
Publication year:2021
Pages:127-140
Language:English
ISSN:09252312
E-ISSN:18728286
CODEN:NRCGEO
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Building detection is a critically important task in the field of remote sensing and it is conducive to urban construction planning, disaster survey, shantytown modification, and emergency landing, it etc. However, few studies have focused on the task of the clustered building detection which is inescapable and challenging for some relatively low space resolution images. The appearance structures of those buildings are not clear enough for the single-building detection. Whereas, it has been found that the distributions of clustered buildings are mostly dense and cellular, while the backgrounds are not. This clue will be beneficial to the clustered building detection. Motivated by the fact above and other similar density estimation applications, this work mainly focuses on the information mining mechanism of dense and cellular structure. Firstly, we propose a concept of Clustered Building Detection (CBD), which contributes to develop clustered building detection techniques of remote sensing images. Secondly, a saliency estimation algorithm is proposed to mine the prior information for the clustered buildings. Thirdly and most notably, combining with the CBD and the density saliency map, a Population Capacity Estimation (PCE) method is presented. The PCE can be easily used to estimate the population carrying capacity of certain areas and future applied for national land resource management. Moreover, a Clustered Building Detection Dataset (CBDD) from Gaofen-2 satellite is annotated and contributed for the public research. The experimental results by the representative detection algorithms manifest the effectiveness for the clustered building detection.
© 2021 Elsevier B.V.
Number of references:66
Main heading:Remote sensing
Controlled terms:Buildings - Deep neural networks
Uncontrolled terms:Building detection - Building population - Capacity estimation - Clustered building detection - Construction planning - Deep neural network - Population capacity estimation - Remote-sensing - Saliency heatmap - Urban construction
Classification code:402 Buildings and Towers - 461.4 Ergonomics and Human Factors Engineering
DOI:10.1016/j.neucom.2021.06.002
Funding text:This work is supported by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (No. QYZDY-SSW-JSC044), and by the National Natural Science Foundation of China (No. 61871470).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310143987
Title:Calibration of geometrical aberration in transmitted wavefront testing of refractive optics with deflectometry
Authors:Wang, Daodang (1, 2, 3); Yin, Yamei (4); Dou, Jinchao (2); Kong, Ming (2); Xu, Xinke (2); Lei, Lihua (5); Liang, Rongguang (6)
Author affiliation:(1) College of Energy Engineering, Zhejiang University, Hangzhou; 310027, China; (2) College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou; 310018, China; (3) Wenzhou Research Institute of Zhejiang University, Wenzhou; 325006, China; (4) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (5) Shanghai Key Lab. of Online Test and Control Technology, Shanghai Institute of Measurement and Testing Technology, Shanghai; 201203, China; (6) James C. Wyant College of Optical Sciences, University of Arizona, Tucson; AZ; 85721, United States
Corresponding author:Wang, Daodang(wangdaodang@sina.com)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:7
Issue date:March 1, 2021
Publication year:2021
Pages:1973-1981
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:Deflectometry, with its noticeable advantages such as simple structure, large dynamic range, and high accuracy comparable to interferometry, has been one of the powerful metrological techniques for optical surfaces in recent years. In the "null" deflectometric transmitted wavefront testing of refractive optics, ray tracing of the test system model is required, in which both the miscalibration of system geometrical parameters and optical tolerances on tested optics could introduce significant geometrical aberrations in the testing results. In this paper, the geometrical aberration introduced by a system modeling error in the transmitted wavefront testing is discussed. Besides, a calibration method based on polynomial optimization of geometrical aberration is presented for the geometrical aberration calibration. Both simulation and experiment have been performed to validate the feasibility of the proposed calibration method. The proposed method can calibrate the optical tolerances on tested optics effectively, and it is feasible even with a large geometric error, providing a viable way to address the uncertainty in system modeling in transmitted wavefront testing of freeform refractive optics with large dynamic range.
© 2021 Optical Society of America
Number of references:35
Main heading:Aberrations
Controlled terms:Calibration - Fits and tolerances - Geometry - Uncertainty analysis - Wave transmission - Wavefronts
Uncontrolled terms:Calibration method - Geometric errors - Optical surfaces - Optical tolerances - Polynomial optimization - Refractive optics - Simple structures - Transmitted wavefronts
Classification code:921 Mathematics - 922.1 Probability Theory
DOI:10.1364/AO.415715
Funding text:National Natural Science Foundation of China (51775528); Natural Science Foundation of Zhejiang Province (LY17E050016, LY19F050008, LY21E050014).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810613369
Title:A Deformable Convolutional Neural Network with Oriented Response for Fine-Grained Visual Classification
Authors:Ruan, Shangxian (1); J., Yang; J., Chen
Author affiliation:(1) Amazingx Academy, Foshan, China; (2) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China; (3) University of Chinese Academy of Sciences, Beijing, China
Source title:ACM International Conference Proceeding Series
Abbreviated source title:ACM Int. Conf. Proc. Ser.
Part number:1 of 1
Issue title:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021
Issue date:February 26, 2021
Publication year:2021
Pages:133-140
Article number:3457702
Language:English
ISBN-13:9781450389310
Document type:Conference article (CA)
Conference name:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021
Conference date:February 26, 2021 - March 1, 2021
Conference location:Virtual, Online, China
Conference code:169701
Publisher:Association for Computing Machinery
Abstract:

Fine-grained visual classification (FGVC) aims to classify images belonging to the same basic category in a more detailed sub-category. It is a challenging research topic in the field of computer vision and pattern recognition in recent years. The existing FGVC method conduct the task by considering the part detection of the object in the image and its variants, which rarely pays attention to the difference in expression of many changes such as object size, posture, and perspective. As a result, these methods generally face two major difficulties: 1) How to effectively pay attention to the latent semantic region, and reduce the interference caused by many changes in pose and perspective; 2) How to extract rich feature information for non-rigid and weak structure objects. In order to solve these two problems, this paper proposes a deformable convolutional neural network with oriented response for FGVC. The proposed method can be divided into three main steps: firstly, the local region of latent semantic information is localized based on a lightweight CAM network; then, the deformable convolutional ResNet-50 network and the rotation-invariant coding oriented response network are designed, which input the original image and local region into the feature network to learn the discriminant features of rotation invariance; finally, the learned features are embed into a joint loss to optimize the entire network end-to-end. Experiments are carried out on three challenging FGVC datasets, including CUB-200-2011, FGVC_Aircraft and Aircraft_2 datasets. The results show that the accuracy of the proposed method on all datasets is better than the comparison method, which can effectively improve the accuracy of weakly supervised FGVC.
© 2021 ACM.
Number of references:25
Main heading:Convolutional neural networks
Controlled terms:Convolution - Deformation - Image coding - Learning systems - Object detection - Rigid structures - Semantics - Supervised learning
Uncontrolled terms:Comparison methods - Latent semantics - Original images - Research topics - Rich features - Rotation invariance - Rotation invariant - Visual classification
Classification code:408 Structural Design - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing
DOI:10.1145/3457682.3457702

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210209764290
Title:Development of a self-calibration method for real-time monitoring of SO2 ship emissions with UV cameras????(Open Access)
Authors:Wu, Kuijun (1); Xiong, Yuanhui (2, 3); Feng, Yutao (4); Yu, Yi (5); Li, Faquan (2)
Author affiliation:(1) School of Opto-Electronic Information Science and Technology, Yantai University, Yantai; 264005, China; (2) State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute ofPhysics and Mathematics, Innovation Academy of Precision Measurement Science and Technology, ChineseAcademy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan; 430071, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (5) College of Meteorology and Oceanography, National University of Defense Technology, Changsha; 410073, China
Corresponding author:Li, Faquan(lifaquan@wipm.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:2
Issue date:January 18, 2021
Publication year:2021
Pages:1813-1823
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:OSA - The Optical Society
Abstract:Self-calibration of UV cameras was demonstrated for the first time. This novel method has the capability of real-time continuous calibration by using the raw images at 310 nm and 330 nm without changing the viewing direction or adding any additional equipment. The methodology was verified through simulations and experiments and demonstrated to be of greatly improved effectiveness and accuracy. The errors of self-calibration mothed are estimated by comparison with the differential optical absorption spectroscopy (DOAS) approach, and it can be reduced to 1.8% after filter transmittance corrections. The results show that the self-calibration method appears to have great potential as a future technique for quantitative and visual real-time monitoring of SO2 emissions from ships and other point sources (such as oil refineries, power plants, or more broadly, any industrial stack) when the field of view (FOV) of the system is not completely covered by the SO2 plumes.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Number of references:18
Main heading:Calibration
Controlled terms:Absorption spectroscopy - Cameras - Industrial emissions - Light absorption - Ships - Sulfur dioxide
Uncontrolled terms:Additional equipment - Continuous calibrations - Differential optical absorption spectroscopy - Real time monitoring - Self calibration - Self-calibration method - Ship emissions - Viewing directions
Classification code:451.1 Air Pollution Sources - 741.1 Light/Optics - 742.2 Photographic Equipment - 804.2 Inorganic Compounds
Numerical data indexing:Size 3.10e-07m, Size 3.30e-07m, Percentage 1.80e+00%
DOI:10.1364/OE.415156
Funding details: Number: 41975039,61705253, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFC0211900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding. National Key Research and Development Program of China (2017YFC0211900); National Natural Science Foundation of China (41975039, 61705253).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211210123555
Title:Cross-model retrieval with deep learning for business application????(Open Access)
Authors:Wang, Yufei (1); Wang, Huanting (2, 3); Yang, Jiating (2); Chen, Jianbo (3)
Author affiliation:(1) Simon Fraser University, 8888 University Dr, Bumaby; BC; V5A 1S6, Canada; (2) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Yang, Jiating(yangjiating@opt.ac.cn)
Source title:IOP Conference Series: Earth and Environmental Science
Abbreviated source title:IOP Conf. Ser. Earth Environ. Sci.
Volume:1802
Part number:3 of 4
Issue:3
Issue title:7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020 - 2. Algorithm Design and Computational Science
Issue date:March 9, 2021
Publication year:2021
Article number:032035
Language:English
ISSN:17551307
E-ISSN:17551315
Document type:Conference article (CA)
Conference name:2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020
Conference date:November 14, 2020 - November 15, 2020
Conference location:Busan, Korea, Republic of
Conference code:167760
Publisher:IOP Publishing Ltd
Abstract:Cross-modal retravel has been used in many fields, such as business and search engines. Most search engines for business are text-based, but text-based search engines are limited by equipment and the strict requirement for knowledge. Text-based search needs keyboards to finish the search process, which requires users to have the knowledge of using keyboards. Compared to the text-based search, audio-based search has advantages. First, it avoids the traditional ways of inputting information. And it gets rid of the gap in time between inputting information for searching and getting useful information. In this paper, we propose a way to use audio to search images for business applications. We use deep learning to implement cross-modal retrieval systems between images and audio. We first extract features from images and audio respectively. And then we implement a neural network with two identical networks to learn the correspondence between images and audio. The first network extracts the features from images and audio further for calculation, and the second network learns whether two features from different modalities are related. This research provides a new way for business applications to search for information more instantly.
© Published under licence by IOP Publishing Ltd.
Number of references:20
Main heading:Search engines
Controlled terms:Audio systems - Computer aided design - Deep learning - Image processing - Learning systems - Manufacture
Uncontrolled terms:Audio-based - Business applications - Cross model - Cross-modal - Retrieval systems - Search image - Search process
Classification code:537.1 Heat Treatment Processes - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications
DOI:10.1088/1742-6596/1802/3/032035

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20210509874619
Title:Monte Carlo simulation of laser illumination system using return photon counts
Authors:Li, Lanlan (1); Zhou, Lei (2)
Author affiliation:(1) School of Optoelectronic Engineering, Xian Technological University, Xian; 710021, China; (2) Xian Research Institute of Navigation Technology, Xian; 710068, China
Corresponding author:Zhou, Lei(zlandl3@163.com)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:117610Y
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:In order to further study the performance of laser illumination systems, a Monte Carlo simulation system is established for the return photons when laser illuminating the target. The physical process of photons from the emission to reception is simulated. The laser illumination system involves vacuum laser transmitting, atmospheric turbulence and return photons processing. Based on the simulation system, the quality of the laser far field spot is verified and the character of return photons is analyzed. The simulation results demonstrate that the simulation system performs well and satisfy requirements for research of laser illumination system with atmospheric turbulence.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:16
Main heading:Monte Carlo methods
Controlled terms:Atmospheric thermodynamics - Atmospheric turbulence - Photonics - Photons
Uncontrolled terms:Far field - Laser illuminating - Laser illumination - Photon count - Physical process - Simulation systems
Classification code:443.1 Atmospheric Properties - 741.1 Light/Optics - 922.2 Mathematical Statistics - 931.3 Atomic and Molecular Physics
DOI:10.1117/12.2587239

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213210745070
Title:Highly versatile broadband RF photonic fractional Hilbert transformer based on a Kerr soliton crystal microcombs????(Open Access)
Authors:Tan, Mengxi (1); Xu, Xingyuan (2); Boes, Andreas (3); Corcoran, Bill (4); Wu, Jiayang (5); Nguyen, Thach G. (6); Chu, St (7); Little, Brent (8); Mitchell, Arnan (9); Lowery, Arthur J. (10); Morandotti, Roberto (11); Moss, David J (12)
Author affiliation:(1) Center for Microphotonics, Swinburne University of Technology, 3783 Hawthorn, Victoria, Australia, (e-mail: mengxitan@swin.edu.au); (2) electrical and computer engineering, Monash University, 2541 Clayton, Victoria, Australia, (e-mail: mike.xu@monash.edu); (3) School of Engineering, RMIT University, Melbourne, Victoria, Australia, (e-mail: andreas.boes@rmit.edu.au); (4) Electrical and Computer Systems Engineering, Monash University, Melbourne, Victoria, Australia, (e-mail: bill.corcoran@monash.edu); (5) Centre for Micro-Photonics, Swinburne University of Technology, 3783 Hawthorn, Victoria, Australia, 3122 (e-mail: jiayangwu@swin.edu.au); (6) School of Electrical and Computer Engineering, RMIT University, Melbourne, Victoria, Australia, 3001 (e-mail: thach.nguyen@rmit.edu.au); (7) Physics, City University of Hong Kong, Kowloon, Hong Kong, Hong Kong, (e-mail: saitchu@cityu.edu.hk); (8) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, 53046 Xi'an, Shaanxi, China, (e-mail: brent.little@opt.ac.cn); (9) School of Electrical and Computer Engineering, RMIT University, Melbourne, Victoria, Australia, 3001 (e-mail: arnan.mitchell@rmit.edu.au); (10) Electrical & Computer Systems Engineering, Monash University, Clayton, VIC, Victoria, Australia, (e-mail: arthur.lowery@monash.edu); (11) EMT, INRS-EMT, Varennes, Quebec, Canada, (e-mail: morandotti@emt.inrs.ca); (12) Center for Microphotonics, Swinburne University of Technology, 3783 Hawthorn, Victoria, Australia, (e-mail: dmoss@swin.edu.au)
Source title:Journal of Lightwave Technology
Abbreviated source title:J Lightwave Technol
Issue date:2021
Publication year:2021
Language:English
ISSN:07338724
E-ISSN:15582213
CODEN:JLTEDG
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

We demonstrate an RF photonic fractional Hilbert transformer based on an integrated Kerr micro-comb source featuring a record low free spectral range of 49 GHz, yielding 75 microcomb lines across the C-band. By programming and shaping the comb lines according to calculated tap weights, we demonstrate that the Hilbert transformer can achieve tunable bandwidths ranging from 1.2 to 15.3 GHz, variable center frequencies from baseband to 9.5 GHz, and arbitrary fractional orders. We experimentally characterize the RF amplitude and phase response of the tunable bandpass and lowpass Hilbert transformers with 90 and 45-degree phase shift. The experimental results show good agreement with theory, confirming the effectiveness of our approach as a powerful way to implement the standard as well as fractional Hilbert transformers with broad and variable processing bandwidths and centre frequencies, together with high reconfigurability and reduced size and complexity.
IEEE
Main heading:Bandwidth
Controlled terms:Crystals
Uncontrolled terms:Center frequency - Centre frequency - Fractional order - Free spectral range - Hilbert transformers - Processing bandwidths - Reconfigurability - Tunable bandwidth
Classification code:716.1 Information Theory and Signal Processing - 933.1 Crystalline Solids
Numerical data indexing:Frequency 1.20e+09Hz to 1.53e+10Hz, Frequency 4.90e+10Hz, Frequency 9.50e+09Hz
DOI:10.1109/JLT.2021.3101816

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:6137758
Title:Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an
Authors:Huige, Di (1); Siwen, Li (1); Yun, Yuan (1); Dengxin, Hua (1); jianyu, Wang (2)
Author affiliation:(1) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China; (2) Key Laboratory of Active Opto-Electronics Technology, Chinese Academy of Sciences, Shanghai; 200083, China
Corresponding author:Dengxin, Hua(dengxinhua@xaut.edu.cn)
Source title:Atmospheric Environment
Abbreviated source title:Atmos. Environ.
Volume:247
Issue date:February 15, 2021
Publication year:2021
Article number:118215
Language:English
ISSN:13522310
E-ISSN:18732844
CODEN:AENVEQ
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:To understand the characteristics of atmospheric pollution in Xi'an, China, the vertical structure of aerosols and meteorological data (temperature and relative humidity) during atmospheric pollution processes were obtained and studied. Lidar and radiosonde data were used for analyses of atmospheric pollution. Polarization lidar was used to study the vertical distribution and optical properties of aerosols during haze and dust processes that occurred in 2015–2016. The planetary boundary layer height (PBLH) and types of aerosol particles were retrieved from polarization lidar. A case study shows that a low PBLH and complex vertical distributions of aerosols, temperature and relative humidity (RH) were the main structural characteristics of haze days. The backscatter coefficient exceeded 0.015 km−1·Sr−1, while the linear particle depolarization ratio was relatively small. A large depolarization ratio above the haze layer, which induces the existence of floating dust, was observed by polarization lidar. Compared with those of haze processes, the vertical aerosol and temperature distributions of dust processes were different. Statistical analyses of the PBLH, temperature inversion, RH and near-surface aerosol concentration were also presented. A lower PBLH, lower average lapse rate of temperature within the PBL, and higher RH were found when haze pollution occurred. An inversion at the top of the boundary layer aggravates ground pollution, while there is not always a temperature inversion when haze occurs in Xi'an. Together, a lower PBLH and lower average lapse rate of temperature weaken the vertical diffusion of pollutants. Decreased vertical diffusion should be the main reason for the formation and persistence of pollution in Xi'an. Increased RH was the catalyst for haze pollution. The aggravation of haze was usually accompanied by an increase in RH, and the decline of haze processes was also accompanied by a decrease or increase (>90%) in RH.
© 2021 Elsevier Ltd
Number of references:30
Controlled terms:aerosol - aerosol formation - atmospheric pollution - boundary layer - dust - haze - meteorology - observational method - particulate matter - spatiotemporal analysis - vertical distribution
Geographic terms:China - Shaanxi - Xian
Classification code:70.3.3 Pollution - 71.7.16 Atmospheric pollution - 74.2.2 Concepts and issues in environmental planning
DOI:10.1016/j.atmosenv.2021.118215
Funding details: Number: 41627807, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61875163, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by grants from National Natural Science Foundation of China (41627807, 61875163), and Key Laboratory Open Project Fund Chinese academy of sciences (AOE 2017-1).

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210809937521
Title:Monocular depth estimation based on a single image: A literature review
Authors:Tian, Yuan (1, 2); Hu, Xiaodong (1)
Author affiliation:(1) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (2) University of Chinese Academy of Sciences, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11720
Part number:1 of 1
Issue title:Twelfth International Conference on Graphics and Image Processing, ICGIP 2020
Issue date:2021
Publication year:2021
Article number:117201Z
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510642775
Document type:Conference article (CA)
Conference name:12th International Conference on Graphics and Image Processing, ICGIP 2020
Conference date:November 13, 2020 - November 15, 2020
Conference location:Xi'an, China
Conference code:167013
Sponsor:Chang'an University; et al.; Foshan University; Northwest A and F University; Ocean University of China; Sichuan University
Publisher:SPIE
Abstract:Monocular depth estimation is a very valuable but also very challenging problem. In order to solve this ill-posed problem, traditional approaches apply depth cues such as defocusing, atmospheric scattering and shading to estimate depth information and approaches based on machine learning apply frameworks such as MRF and data-driven learning. With the development of deep learning, the monocular depth estimation approaches based on CNN and other networks have achieved good results and gradually become the mainstream. In this paper, we summarize some typical and representative literature on monocular depth estimation based on a single image in the past two decades and depict our analysis involved in these approaches. In addition, this paper also analyzes and compares the results obtained by some typical approaches, which may provide some guidance for those who are interested in this field.
© 2021 SPIE.
Number of references:60
Main heading:Image processing
Controlled terms:Deep learning - Magnetorheological fluids - Structural frames
Uncontrolled terms:Atmospheric scattering - Depth Estimation - Depth information - Ill posed problem - Literature reviews - On-machines - Single images - Traditional approaches
Classification code:408.2 Structural Members and Shapes - 708.4 Magnetic Materials
DOI:10.1117/12.2589510

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010360078
Title:Bifurcation-tunable Diffractionless Light Propagation in One-dimensional Non-Hermitian Photonic Lattice
Title of translation:一维非厄密光子晶格中分叉可调无衍射光传输
Authors:Liu, Zhenjuan (1); Wang, Haohao (1); Dai, Yanan (1); Zhang, Zhiqing (1); Wang, Yishan (2); Qi, Xinyuan (1)
Author affiliation:(1) School of Physics, Northwestern University, Xi'an; 710027, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Qi, Xinyuan(qixycn@nwu.edu.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:4
Issue date:April 25, 2021
Publication year:2021
Article number:0423003
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

The light bifurcation transmission without diffraction in one-dimensional periodic compound photonic lattice was studied theoretically and numerically. When the lattice equals to degenerated Su-Schrieffer-Heeger model, the incident light with the wave number k=±π will bifurcate into two symmetric branches without any diffraction and the angles between two beams can be controlled by the coupling J between two lattice sites. In addition, a modulation phase φ is introduced. When the non-Hermitian perturbations satisfy the parity-time symmetry, the diffractionless light bifurcation phenomenon with any incident light wave can be realized as long as the incident wave vector k and the modulation phase φ respect the expression k+φ=±π. Further studies have shown that the next-nearest coupling can control the transmission angle and power division of two branches. This research provides new ideas for the design of optical switches and future all-optical paths.
© 2021, Science Press. All right reserved.
Number of references:22
Main heading:Light transmission
Controlled terms:Bifurcation (mathematics) - Diffraction - Modulation - Optical lattices - Optical switches - Photonics - Transmissions - Voltage dividers
Uncontrolled terms:Bifurcation phenomena - Incident light - Incident light waves - Incident waves - Parity-time symmetries - Power division - Su Schrieffer Heeger model - Transmission angle
Classification code:602.2 Mechanical Transmissions - 704.2 Electric Equipment - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions
DOI:10.3788/gzxb20215004.0423003
Funding details: Number: 91950104, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLST201805, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;
Funding text:Open Research Fund of State Key Laboratory of Transient Optics and Photonics (No.SKLST201805), Natural Science Foundation of China(No.91950104).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609904074
Title:A Novel Negative-Transfer-Resistant Fuzzy Clustering Model with a Shared Cross-Domain Transfer Latent Space and its Application to Brain CT Image Segmentation
Authors:Jiang, Yizhang (1, 2); Gu, Xiaoqing (3); Wu, Dongrui (4); Hang, Wenlong (5); Xue, Jing (6); Qiu, Shi (7); Lin, Chin-Teng (8)
Author affiliation:(1) Jiangsu Key Laboratory of Media Design and Software Technology, Jiangnan University, Wuxi, Jiangsu; 214122, China; (2) School of Digital Media, Jiangnan University, Wuxi, Jiangsu; 214122, China; (3) School of Information Science and Engineering, Changzhou University, Changzhou, Jiangsu; 213164, China; (4) Key Laboratory of the Ministry of Education for Image Processing and Intelligent Control, School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei; 430074, China; (5) School of Computer Science and Technology, Nanjing Tech University, Nanjing, Jiangsu; 211816, China; (6) Department of Nephrology, Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu; 214023, China; (7) Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi; 710119, China; (8) Centre of Artificial Intelligence, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo; NSW; 2007, Australia
Source title:IEEE/ACM Transactions on Computational Biology and Bioinformatics
Abbreviated source title:IEEE/ACM Trans. Comput. BioL. Bioinf.
Volume:18
Issue:1
Issue date:January-February 2021
Publication year:2021
Pages:40-52
Article number:8949741
Language:English
ISSN:15455963
E-ISSN:15579964
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Traditional clustering algorithms for medical image segmentation can only achieve satisfactory clustering performance under relatively ideal conditions, in which there is adequate data from the same distribution, and the data is rarely disturbed by noise or outliers. However, a sufficient amount of medical images with representative manual labels are often not available, because medical images are frequently acquired with different scanners (or different scan protocols) or polluted by various noises. Transfer learning improves learning in the target domain by leveraging knowledge from related domains. Given some target data, the performance of transfer learning is determined by the degree of relevance between the source and target domains. To achieve positive transfer and avoid negative transfer, a negative-transfer-resistant mechanism is proposed by computing the weight of transferred knowledge. Extracting a negative-transfer-resistant fuzzy clustering model with a shared cross-domain transfer latent space (called NTR-FC-SCT) is proposed by integrating negative-transfer-resistant and maximum mean discrepancy (MMD) into the framework of fuzzy c-means clustering. Experimental results show that the proposed NTR-FC-SCT model outperformed several traditional non-transfer and related transfer clustering algorithms.
© 2004-2012 IEEE.
Number of references:43
Main heading:Clustering algorithms
Controlled terms:Cluster analysis - Computerized tomography - Fuzzy clustering - Image segmentation - Knowledge management - Medical imaging - Transfer learning
Uncontrolled terms:Cross-domain - Degree of relevance - Fuzzy C means clustering - Fuzzy clustering modeling - ITS applications - SCT model - Target domain - Traditional clustering
Classification code:723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 746 Imaging Techniques - 903.1 Information Sources and Analysis
DOI:10.1109/TCBB.2019.2963873
Funding details: Number: 61702225,61711540041,61772241,61806026, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: BK20160187,BK20161268,BK20180956, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: XYDXX-127, Acronym: -, Sponsor: Six Talent Peaks Project in Jiangsu Province;Number: JUSRP11737,JUSRP51614A, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: -, Acronym: -, Sponsor: Qinglan Project of Jiangsu Province of China;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grants 61806026, 61702225, 61772241, and 61711540041, in part by the Natural Science Foundation of Jiangsu Province under Grants BK20180956, BK20161268, and BK20160187, in part by the Fundamental Re-search Funds for the Central Universities under Grants JUSRP51614A and JUSRP11737, in part by 2016 Qinglan Project of Jiangsu Province, and in part by Six Talent Peaks Project of Jiangsu Province under Grant XYDXX-127.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010376904
Title:Analysis and correction of geometrical error-induced pointing errors of a space laser communication APT system????(Open Access)
Authors:Zhang, Furui (1); Ruan, Ping (2); Han, Junfeng (2); Li, Yao (1)
Author affiliation:(1) College of Optoelectronic Engineering, Xi’an Technological University, Xi’an, China; (2) Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an, China
Corresponding author:Zhang, Furui
Source title:International Journal of Optomechatronics
Abbreviated source title:Int. J. Optomechatronics
Volume:15
Issue:1
Issue date:2021
Publication year:2021
Pages:19-30
Language:English
ISSN:15599612
E-ISSN:15599620
Document type:Journal article (JA)
Publisher:Bellwether Publishing, Ltd.
Abstract:

The geometrical error caused pointing error is an inevitable problem in space satellite laser communication terminals which can affect the pointing accuracy of the APT (acquisition pointing and tracking) system greatly, in order to facilitate the assembling of the APT system and improve the performance of the laser communication system, the geometrical error sensitivity about the APT pointing accuracy is analyzed based on multi-body kinematics method in this paper, the error transformation matrix is derived and the geometrical error is analyzed, the simulation results provide some pointing error distribution regulars which are conductive to assembling. Based on the above research, the geometrical error correction experiment is performed and the pointing accuracy of the APT system is tested, the expectation value of the pointing error can reach 29.9 µrad which is greatly improved. This research can provide technical references for the design and analysis of space laser communication terminals.
© 2021 The Author(s). Published with license by Taylor & Francis Group, LLC.
Number of references:24
Main heading:Mathematical transformations
Controlled terms:Error correction - Geometry - Integrated optics - Linear transformations
Uncontrolled terms:Design and analysis - Error transformation - Expectation values - Geometrical error - Multi-body kinematics - Pointing accuracy - Pointing and tracking - Space laser communication
Classification code:921 Mathematics - 921.3 Mathematical Transformations
DOI:10.1080/15599612.2021.1895923
Funding details: Number: Y655811213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 20JK0665, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Provincial Department of Education;Number: 2020JQ-818, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:This paper was supported by Basic Research Program of Shaanxi Province Natural Science Foundation [under Nos. 2020JQ-818], Natural Science Foundation of Shaanxi Provincial Department of Education [under Nos. 20JK0665], 135 Project of Institute of Chinese Academy of Sciences [NO. Y655811213].

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:6186484
Title:Spectral-Spatial Joint Sparse NMF for Hyperspectral Unmixing
Authors:Dong, Le (1, 3); Yuan, Yuan (2, 4); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 10119, China; (2) School of Computer Science, Northwestern Polytechnical University, Xi'an; 710072, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Volume:59
Issue:3
Issue date:March 2021
Publication year:2021
Pages:2391-2402
Article number:9141345
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:The nonnegative matrix factorization (NMF) combining with spatial-spectral contextual information is an important technique for extracting endmembers and abundances of hyperspectral image (HSI). Most methods constrain unmixing by the local spatial position relationship of pixels or search spectral correlation globally by treating pixels as an independent point in HSI. Unfortunately, they ignore the complex distribution of substance and rich contextual information, which makes them effective in limited cases. In this article, we propose a novel unmixing method via two types of self-similarity to constrain sparse NMF. First, we explore the spatial similarity patch structure of data on the whole image to construct the spatial global self-similarity group between pixels. And according to the regional continuity of the feature distribution, the spectral local self-similarity group of pixels is created inside the superpixel. Then based on the sparse expression of the pixel in the subspace, we sparsely encode the pixels in the same spatial group and spectral group respectively. Finally, the abundance of pixels within each group is forced to be similar to constrain the NMF unmixing framework. Experiments on synthetic and real data fully demonstrate the superiority of our method over other existing methods.
© 1980-2012 IEEE.
Number of references:60
Controlled terms:analytical framework - correlation - matrix - multispectral image - pixel - satellite imagery - spectral analysis
Classification code:71.8.5.4 Remote sensing: numerical and image analysis
DOI:10.1109/TGRS.2020.3006109
Funding details: Number: 2017YFB0502900, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 61702498, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 61772510, Acronym: -, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 61772510 and Grant 61702498, in part by the National Natural Science Foundation for Distinguished Young Scholars under Grant 61825603, in part by the Young Top-Notch Talent Program of the Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, and in part by the CAS Light of West China Program under Grant XAB2017B15.

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210809938434
Title:Hardware design of an image acquisition device for target observation and tracking????(Open Access)
Authors:Bian, He (1); Zhang, Haifeng (1); Wang, Hua (1); Huang, Jijiang (1)
Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China
Corresponding author:Bian, He(hebian@opt.cn)
Source title:IOP Conference Series: Earth and Environmental Science
Abbreviated source title:IOP Conf. Ser. Earth Environ. Sci.
Volume:632
Part number:4 of 5
Issue:4
Issue title:2020 Asia Conference on Geological Research and Environmental Technology - Number 4
Issue date:January 13, 2021
Publication year:2021
Article number:042043
Language:English
ISSN:17551307
E-ISSN:17551315
Document type:Conference article (CA)
Conference name:2020 Asia Conference on Geological Research and Environmental Technology, GRET 2020
Conference date:October 10, 2020 - October 11, 2020
Conference location:Kamakura City, Japan
Conference code:167012
Publisher:IOP Publishing Ltd
Abstract:In order to observe and track the separated targets in the air, This paper presents a hardware image acquisition platform based on three-way camera + FPGA + two-way DSP, Xilinx artix-7 series xc7a200t-2fbg676i FPGA is used as the main processor. It is mainly responsible for high-speed image acquisition, preprocessing, transmission and display, TMS320DM368 DSP of Texas Instruments is used as image compression processor. After receiving the image transmitted by artix-7 FPGA, the image H.264 is compressed. This architecture solves the delay problem of traditional image acquisition system in hardware architecture level, and realizes the real-time and high-speed image acquisition and processing. At the same time, the hardware has the basis of multi-channel image acquisition, multi-channel image compression, visible light and infrared camera acquisition data fusion.
© 2021 IOP Conference Series: Earth and Environmental Science.
Number of references:9
Main heading:Image compression
Controlled terms:Cameras - Data fusion - Environmental technology - Field programmable gate arrays (FPGA) - Geology - Image acquisition - Integrated circuit design - Target tracking
Uncontrolled terms:Acquisition device - Hardware architecture - Hardware design - High speed image - Image acquisition systems - Infra-red cameras - Texas Instruments - Visible light
Classification code:454 Environmental Engineering - 481.1 Geology - 714.2 Semiconductor Devices and Integrated Circuits - 721.2 Logic Elements - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 742.2 Photographic Equipment
DOI:10.1088/1755-1315/632/4/042043

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20213310767949
Title:Mechanism of All-Optical Spatial Light Modulation in Graphene Dispersion
Authors:Liu, Shan (1, 2); Han, Jing (1); Cheng, Xuemei (1, 2); Wang, Xing (2); Zhang, Qian (3); He, Bo (1); Jiao, Tengfei (1); Ren, Zhaoyu (1)
Author affiliation:(1) State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon-Technology, Northwest University, Xi'an; 710069, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Electronic Engineering, Xi'An University of Posts and Telecommunications, Xi'an; 710121, China
Corresponding author:Cheng, Xuemei(xmcheng@nwu.edu.cnemailrzy@nwu.edu.cn)Ren, Zhaoyu(rzy@nwu.edu.cn)
Source title:Journal of Physical Chemistry C
Abbreviated source title:J. Phys. Chem. C
Volume:125
Issue:30
Issue date:August 5, 2021
Publication year:2021
Pages:16598-16604
Language:English
ISSN:19327447
E-ISSN:19327455
Document type:Journal article (JA)
Publisher:American Chemical Society
Abstract:

Graphene is a superb material with significant potential in broadband all-optical modulation. However, the mechanism of the all-optical modulation in graphene dispersion is still under debate. Here, we report on a pump power-dependent spatial light modulation by using the 780 nm CW laser as the pump and signal beams via graphene dispersion. The results indicate that graphene is able to convert the Gaussian signal beam into a hollow beam with a ring pattern. Examining the temporal evolution of the ring pattern, we found that spatial cross-phase modulation (SXPM) plays the dominant role at low pump power, while nonlinear scattering (NLS) becomes dominant when the pump power is high. Furthermore, the dependence of the size and intensity of the signal ring pattern on the pump power is investigated. The results can be well explained by SXPM, NLS, and saturation absorption (SA) effects. Finally, an all-optical switch is developed based on the dependence of the signal intensity on the pump power. It is demonstrated that both in-phase and out-phase modulation can be realized in one system. This work not only provides useful information in understanding the mechanism of graphene in interacting with the light, but also suggests a new way to produce hollow beam with tunable size and achieve an all-optical switch with both in-phase and out-phase modulation.
© 2021 American Chemical Society.
Number of references:59
Main heading:Optical signal processing
Controlled terms:Continuous wave lasers - Dispersions - Gaussian beams - Graphene - Light modulation - Optical switches - Phase modulation - Pumping (laser)
Uncontrolled terms:All optical switch - Cross phase modulation - Graphene dispersions - Nonlinear scattering - Saturation absorption - Signal intensities - Spatial light modulation - Temporal evolution
Classification code:711 Electromagnetic Waves - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 761 Nanotechnology - 804 Chemical Products Generally - 951 Materials Science
DOI:10.1021/acs.jpcc.1c04423

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509858682
Title:Novel Method Based on Hollow Laser Trapping-LIBS-Machine Learning for Simultaneous Quantitative Analysis of Multiple Metal Elements in a Single Microsized Particle in Air
Authors:Niu, Chen (1); Cheng, Xuemei (1); Zhang, Tianlong (2); Wang, Xing (3); He, Bo (1); Zhang, Wending (1); Feng, Yaozhou (2); Bai, Jintao (1); Li, Hua (2, 4)
Author affiliation:(1) State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon-Technology, Northwest University, Xi'an; 710069, China; (2) Key Laboratory of Synthetic, Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an; 710127, China; (3) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an; 710065, China
Corresponding author:Cheng, Xuemei(xmcheng@nwu.edu.cnemailxmcheng@nwu.edu.cnemailtlzhang@nwu.edu.cnemailtlzhang@nwu.edu.cn)Cheng, Xuemei(xmcheng@nwu.edu.cnemailtlzhang@nwu.edu.cnemailtlzhang@nwu.edu.cn)Zhang, Tianlong(tlzhang@nwu.edu.cnemailtlzhang@nwu.edu.cn)Zhang, Tianlong(tlzhang@nwu.edu.cn)
Source title:Analytical Chemistry
Abbreviated source title:Anal. Chem.
Volume:93
Issue:4
Issue date:February 2, 2021
Publication year:2021
Pages:2281-2290
Language:English
ISSN:00032700
E-ISSN:15206882
CODEN:ANCHAM
Document type:Journal article (JA)
Publisher:American Chemical Society
Abstract:Elemental identification of individual microsized aerosol particles is an important topic in air pollution studies. However, simultaneous and quantitative analysis of multiple constituents in a single aerosol particle with the noncontact in situ manner is still a challenging task. In this work, we explore the laser trapping-LIBS-machine learning to analyze four elements (Zn, Ni, Cu, and Cr) absorbed in a single micro-carbon black particle in air. By employing a hollow laser beam for trapping, the particle can be restricted in a range as small as ∼1.72 μm, which is much smaller than the focal diameter of the flat-topped LIBS exciting laser (∼20 μm). Therefore, the particle can be entirely and homogeneously radiated, and the LIBS spectrum with a high signal-to-noise ratio (SNR) is correspondingly achieved. Then, two types of calibration models, i.e., the univariate method (calibration curve) and the multivariate calibration method (random forests (RF) regression), are employed for data processing. The results indicate that the RF calibration model shows a better prediction performance. The mean relative error (MRE), relative standard deviation (RSD), and root-mean-squared error (RMSE) are reduced from 0.1854, 363.7, and 434.7 to 0.0866, 179.8, and 216.2 ppm, respectively. Finally, simultaneous and quantitative determination of the four metal contents with high accuracy is realized based on the RF model. The method proposed in this work has the potential for online single aerosol particle analysis and further provides a theoretical basis and technical support for the precise prevention and control of composite air pollution.
© 2021 The Authors. Published by American Chemical Society.
Number of references:33
Main heading:Signal to noise ratio
Controlled terms:Aerosols - Air pollution - Air pollution control - Carbon black - Data handling - Decision trees - Laser beams - Machine learning - Mean square error - Metal analysis - Soldered joints
Uncontrolled terms:Elemental identifications - High signalto-noise ratios (SNR) - Multivariate calibration methods - Prediction performance - Prevention and controls - Quantitative determinations - Relative standard deviations - Root mean squared errors
Classification code:451 Air Pollution - 451.2 Air Pollution Control - 538.1.1 Soldering - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 744.8 Laser Beam Interactions - 803 Chemical Agents and Basic Industrial Chemicals - 922.2 Mathematical Statistics - 961 Systems Science
DOI:10.1021/acs.analchem.0c04155
Funding details: Number: 2018TD-018, Acronym: -, Sponsor: -;Number: 11874299,22073074,51927804,61805200,61805200 11874299, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JM-432, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: SKLST201906, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;
Funding text:We appreciate Dr. Dongbin Qian (Institute of Modern Physics Chinese Academy of Sciences) for the useful discussion and the funds from the National Natural Science Foundation of China (NSFC) (61805200 11874299, 22073074, 51927804), Natural Science Foundation of Shaanxi Province (No. 2020JM-432), the State Key Laboratory of Transient Optics and Photonics (SKLST201906), and Innovation capability support plan of Shaanxi province (No. 2018TD-018).We appreciate Dr. Dongbin Qian (Institute of Modern Physics, Chinese Academy of Sciences) for the useful discussion and the funds from the National Natural Science Foundation of China (NSFC) (61805200, 11874299, 22073074, 51927804), Natural Science Foundation of Shaanxi Province (No. 2020JM-432), the State Key Laboratory of Transient Optics and Photonics (SKLST201906), and Innovation capability support plan of Shaanxi province (No. 2018TD-018).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310148440
Title:A new friction compensation method for photoelectric platform
Title of translation:一种光电稳定平台摩擦力新型补偿方法
Authors:Chang, Sansan (1); Gao, Bo (1); Zhang, Gaopeng (1); Bian, He (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710100, China
Corresponding author:Zhang, Gaopeng(sanandying0825@sina.com)
Source title:Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)
Abbreviated source title:Zhongnan Daxue Xuebao (Ziran Kexue Ban)
Volume:52
Issue:2
Issue date:February 26, 2021
Publication year:2021
Pages:434-442
Language:Chinese
ISSN:16727207
CODEN:ZDXZAC
Document type:Journal article (JA)
Publisher:Central South University of Technology
Abstract:To reduce the negative influence of this disturbance and improve the stability accuracy of photoelectric platform, a new compensation scheme based on friction model was proposed. Firstly, the process of friction rejection by the traditional method was analyzed, and the method of combining the encoder and gyroscope to estimate the speed at low speed was proposed and the friction model was improved by the method. At the same time, an extended state observer(ESO)was introduced to observe and compensate for the error caused by the difference between the system model and the compensation model. The problem of system friction characteristics drift with the environment and other factors in the work was solved. Finally, in order to verify the effectiveness of the method, the speed stability experiment was carried out on the three-axis swing table. The results show that the compensation effect of the near zero speedis is raised by improved friction model. Compared with the traditional method, the speed stability and the isolation degree increase by 67% and 58%, respectively, and the isolation degree can still be maintained when the friction model parameter perturbation is 10%, presentingstrong robustness. This method is easy to be realized in engineering and has a high practical value for compensating for the friction force of photoelectric platform to improve the stability accuracy.
© 2021, Central South University Press. All right reserved.
Number of references:20
Main heading:Friction
Controlled terms:Error compensation - Photoelectricity - Stability
Uncontrolled terms:Compensation effects - Compensation modeling - Compensation scheme - Extended state observer - Friction characteristics - Friction compensation - Friction modeling - Photo-electric platform
Classification code:701.1 Electricity: Basic Concepts and Phenomena
Numerical data indexing:Percentage 1.00e+01%, Percentage 5.80e+01%, Percentage 6.70e+01%
DOI:10.11817/j.issn.1672-7207.2021.02.011
Funding details: Number: 2019JQ-295, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Project(51905529) supported by the National Natural Science Foundation of China; Project(2019JQ-295) supported by the Natural Science Basic Research Program of Shaanxi Province.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810623856
Title:Research on multi-sensor high dynamic range imaging technology and application
Authors:Guo, Lulu (1); Yi, Hongwei (1)
Author affiliation:(1) Space Optical Technology Laboratory, Xi'an Institute of Optical Precision Machinery Chinese Academy of Sciences, Xi'an, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11850
Part number:1 of 1
Issue title:First Optics Frontier Conference
Issue date:2021
Publication year:2021
Article number:118500B
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510645448
Document type:Conference article (CA)
Conference name:1st Optics Frontier Conference 2021
Conference date:April 24, 2021 - April 26, 2021
Conference location:Hangzhou, China
Conference code:169924
Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:

In dynamic scene imaging, multi-sensor high dynamic range (HDR) fusion technology used to solve the ghosting problem of multi-exposure fusion based on camera aperture, and achieve high-quality HDR video imaging. Therefore, it has made significant progress in image capture and synthesis of HDR optical imaging. First, we introduce the development status of multi-sensor based on time bracketing and space bracketing. Then introduce the different method of multi-exposure image fusion, including aligning different exposures, rejecting misalignment information and patch-based optimization. Finally, discuss the key technical issues and development trends of this technology in HDR imaging technology.
© 2021 SPIE.
Number of references:52
Main heading:Imaging techniques
Controlled terms:Image fusion
Uncontrolled terms:Camera aperture - Development status - Development trends - Fusion technology - High dynamic range - High dynamic range imaging - Multi-exposure images - Optical imaging
Classification code:723.2 Data Processing and Image Processing - 746 Imaging Techniques
DOI:10.1117/12.2599254

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210209744690
Title:Modified snapshot spectroscopic ellipsometry based on optical frequency-domain interferometry
Authors:Li, Siyuan (1, 2); Zhang, Chunmin (3); Quan, Naicheng (1, 4)
Author affiliation:(1) Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Key Laboratory of Spectral Imaging Technology CAS, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China; (3) Xi'an Jiaotong University, Xi'an, China; (4) School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, China
Corresponding author:Li, Siyuan(lsy@opt.ac.cn)
Source title:Optik
Abbreviated source title:Optik
Volume:228
Issue date:February 2021
Publication year:2021
Article number:166165
Language:English
ISSN:00304026
Document type:Journal article (JA)
Publisher:Elsevier GmbH
Abstract:We propose a modified snapshot spectroscopic ellipsometry based on optical frequency-domain interferometry. The proposed system employs only one high-order retarder and a Wollaston prism to analyze the changed state of polarization of the reflected light and can provide the maximum channel bandwidth of the channeled spectroscopic ellipsometry. The spectroscopic ellipsometric parameters of isotropic samples can be accurately measured in a measurement speed of 40 ms without mechanical or active modulation devices. The feasibility of the proposed spectroscopic ellipsometry is demonstrated by experiments.
© 2020
Number of references:19
Main heading:Frequency domain analysis
Controlled terms:Interferometry - Natural frequencies - Optical materials - Spectroscopic ellipsometry
Uncontrolled terms:Channel bandwidth - Ellipsometric parameters - Isotropic samples - Measurement speed - Optical frequency domain - Reflected light - State of polarization - Wollaston prism
Classification code:741.3 Optical Devices and Systems - 921.3 Mathematical Transformations - 941.4 Optical Variables Measurements
Numerical data indexing:Time 4.00e-02s
DOI:10.1016/j.ijleo.2020.166165
Funding details: Number: -, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61805193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:The authors thank the anonymous reviewers for their helpful comments and constructive suggestions. The work was supported by Youth Innovation Promotion Association of Chinese Academy of Sciences , The Open Research Fund of Key Laboratory of Spectral Imaging Technology and Chinese Academy of Sciences ; National Natural Science Foundation of China ( 61805193 ).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910312999
Title:Spatio-Temporal Learning for Video Deblurring based on Two-Stream Generative Adversarial Network
Authors:Song, Liyao (1); Q., Wang; H., Li; J., Fan; B., Hu
Author affiliation:(1) School of Information and Communications Engineering, Xi’an Jiaotong University, Xi’an, China; (2) Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an, China; (3) The School of Information and Communications Engineering, Xi’an Jiaotong University, Xi’an, China
Corresponding author:Song, Liyao(sly777@stu.xjtu.edu.cn)
Source title:Neural Processing Letters
Abbreviated source title:Neural Process Letters
Volume:53
Issue:4
Issue date:August 2021
Publication year:2021
Pages:2701-2714
Language:English
ISSN:13704621
E-ISSN:1573773X
CODEN:NPLEFG
Document type:Journal article (JA)
Publisher:Springer
Abstract:

Video-deblurring has achieved excellent results by using deep learning approaches. How to capture the dynamic spatio-temporal information in the videos is crucial on deblurring. In this paper, we propose a two-stream DeblurGAN which combines a 3D stream with a 2D stream to deblur. The 3D convolution provides spatial and temporal invariance to restore the foreground of frames, while the 2D convolution is sufficient to deal with spatial features, given a relatively consistant background. Thus, our model takes advantage of the great processing power of the 3D stream to handle the foreground which usually contains more dynamical motion blur, and the advantage of the simplicity of the 2D stream to handle the mostly consistent background. We have the full advantage of combining both the 3D convolution and the 2D convolution. Then we take the two-stream model as the generator and adopt the adversarial learning. We test our model on the VideoDeblurring and GOPRO datasets, and compare with other methods which we have listed. Our method outperforms others in the Peak Signal-to-Noise Ratio (PSNR), especially shows a good performance handling the foreground with obvious motion blur.
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Number of references:53
Main heading:Signal to noise ratio
Controlled terms:Convolution - Deep learning - Image segmentation
Uncontrolled terms:Adversarial learning - Adversarial networks - Learning approach - Peak signal to noise ratio - Processing power - Spatial features - Spatio-temporal learning - Spatiotemporal information
Classification code:716.1 Information Theory and Signal Processing
DOI:10.1007/s11063-021-10520-y

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910319136
Title:Design of image-side telecentric off-axis three-mirror anastigmatic systems based on the coaxial parent mirrors
Authors:Li, Xijie (1); Zou, Chunbo (1); Yang, Jiating (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China
Corresponding author:Li, Xijie(xijie_li@163.com)
Source title:Optik
Abbreviated source title:Optik
Volume:241
Issue date:September 2021
Publication year:2021
Article number:166855
Language:English
ISSN:00304026
Document type:Journal article (JA)
Publisher:Elsevier GmbH
Abstract:

Image-side telecentric unobscured optical systems have significant application values in the field of space optics. However, off-axis astigmatism increases with an increase of field of view (FOV), relative aperture and image-side telecentricity, so it's very difficult to design image-side telecentric anastigmatic systems with an ultrawide FOV. To solve these issues, this paper proposes an effective method that is based on the coaxial parent mirrors. By calculating the off-axis aberration optical path of the primary mirror (PM), secondary mirror (SM) and tertiary mirror (TM), and introducing even aspheric surface and adding boundary constraints, a prospective system with a focal length of 400 mm, a relative aperture of 1/3, an FOV of 18° × 6°, and a telecentricity of greater than 0.5°is designed. The design results show that the modulation transfer function (MTF) of the system is greater than 0.7 at the Nyquist frequency of 34 lp/mm, which is close to the diffraction limitation. It has a high imaging quality, thereby proving the image-side telecentric off-axis three-mirror anastigmatic (TMA) system to be effective.
© 2021 Elsevier GmbH
Number of references:17
Main heading:Mirrors
Controlled terms:Aberrations - Optical design - Optical systems - Optical transfer function
Uncontrolled terms:Anastigmatic system - Anastigmatism design method - Coaxial parent mirror - Field of views - Off-axis - Off-axis anastigmatism balance condition - Optical system designs - Optical- - Telecentricity - Three-mirror anastigmatic systems
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems
Numerical data indexing:Size 4.00E-01m
DOI:10.1016/j.ijleo.2021.166855

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20202608881345
Title:A contour self-compensated network for salient object detection
Authors:Wang, Yanan (1, 2); Wang, Huawei (1); Cao, Jianzhong (1)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an, China; (2) University of Chinese Academy of Sciences, Beijing, China
Corresponding author:Wang, Yanan(wangyanan@opt.cn)
Source title:Visual Computer
Abbreviated source title:Visual Comput
Volume:37
Issue:6
Issue date:June 2021
Publication year:2021
Pages:1467-1479
Language:English
ISSN:01782789
CODEN:VICOE5
Document type:Journal article (JA)
Publisher:Springer Science and Business Media Deutschland GmbH
Abstract:

Given that existing salient object detection methods cannot effectively predict the fine contours of salient objects when extracting local or global contexts and features, we propose a novel contour self-compensated network (CSCNet) to generate a more accurate saliency map with complete contour. Unlike the common binary saliency detection, we reconstruct the salient object detection problem into a multi-classification problem of the background, the salient object, and the salient contour, where the salient contour is used as the third label for ground truth. Meanwhile, the image and its superpixel map are concatenated as the input of our network to add more edge information. Also, a penalty loss is proposed to restrict the spatial relationship between the background, objects, and their contours. Experimentally, we evaluate the proposed CSCNet on six benchmark datasets in both accuracy and efficiency and evaluate the attribute-based performance on the SOC dataset. Compared with 13 state-of-the-art algorithms, our CSCNet can detect salient objects more accurately and completely without adding too many convolutional layers and parameters.
© 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
Number of references:68
Main heading:Object detection
Controlled terms:Benchmarking - Object recognition
Uncontrolled terms:Benchmark datasets - Edge information - Multi-classification problems - Saliency detection - Salient Contours - Salient object detection - Spatial relationships - State-of-the-art algorithms
Classification code:723.2 Data Processing and Image Processing
DOI:10.1007/s00371-020-01882-w
Funding details: Number: 2019JQ-295, Acronym: -, Sponsor: -;Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work is supported by the National Natural Science Foundation of China (No. 51905529), Shaanxi Province Natural Science-Based Research Program (2019JQ-295), and the UCAS PhD scholarship. Thanks to teacher Adams at NTU for providing equipment and to Yew Lee Tan for proofreading and modifying this paper.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204909586443
Title:Scientific objectives and payloads of Tianwen-1, China's first Mars exploration mission????(Open Access)
Authors:Zou, Yongliao (1, 2); Zhu, Yan (1); Bai, Yunfei (1); Wang, Lianguo (1); Jia, Yingzhuo (1); Shen, Weihua (1); Fan, Yu (1); Liu, Yang (1, 2); Wang, Chi (1, 2); Zhang, Aibing (1); Yu, Guobin (3); Dong, Jihong (4); Shu, Rong (5); He, Zhiping (5); Zhang, Tielong (6); Du, Aimin (7); Fan, Mingyi (8); Yang, Jianfeng (9); Zhou, Bin (10); Wang, Yi (11); Peng, Yongqing (12)
Author affiliation:(1) National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China; (2) State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China; (3) Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China; (4) Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun; 130033, China; (5) Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China; (6) Chinese Academy of Sciences Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei; 230026, China; (7) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing; 100029, China; (8) China Electronics Technology Group Corporation-38, Hefei; 230088, China; (9) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (10) Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100190, China; (11) Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou; 730000, China; (12) Beijing Research Institute of Telemetry, Beijing; 100076, China
Corresponding author:Zou, Yongliao(zouyongliao@nssc.ac.cn)
Source title:Advances in Space Research
Abbreviated source title:Adv. Space Res.
Volume:67
Issue:2
Issue date:January 15, 2021
Publication year:2021
Pages:812-823
Language:English
ISSN:02731177
E-ISSN:18791948
CODEN:ASRSDW
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:This paper describes the scientific objectives and payloads of Tianwen-1, China's first exploration mission to Mars. An orbiter, carrying a lander and a rover, lifted-off in July 2020 for a journey to Mars where it should arrive in February 2021. A suite of 13 scientific payloads, for in-situ and remote sensing, autonomously commanded by integrated payload controllers and mounted on the orbiter and the rover will study the magnetosphere and ionosphere of Mars and the relation with the solar wind, the atmosphere, surface and subsurface of the planet, looking at the topography, composition and structure and in particular for subsurface ice. The mission will also investigate Mars climate history. It is expected that Tianwen-1 will contribute significantly to advance our scientific knowledge of Mars.
© 2020 COSPAR
Number of references:8
Main heading:Orbits
Controlled terms:Ionosphere - Magnetosphere - Martian surface analysis - Remote sensing - Topography
Uncontrolled terms:Exploration missions - Mars climate - Mars exploration - Payload controllers - Scientific knowledge - Scientific objectives - Scientific payloads
Classification code:443.1 Atmospheric Properties - 951 Materials Science
DOI:10.1016/j.asr.2020.11.005
Funding details: Number: -, Acronym: CNSA, Sponsor: China National Space Administration;Number: 11941001,41590851,42072337, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: D020101,D020102,Z181100002918003,Z191100004319001, Acronym: -, Sponsor: Beijing Municipal Science and Technology Commission;
Funding text:This work is supported by the National Science Foundation of China (Grant No. 41590851, 42072337, 11941001), the Beijing Municipal Science and Technology Commission (Grant No. Z191100004319001, Z181100002918003), and by the Pre-research project on Civil Aerospace Technologies No. D020102 and No. D020101 funded by China National Space Administration (CNSA).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Hybrid Gold

Accession number:20212510538378
Title:Research on dynamic range analysis and improvement of imaging equipment
Authors:Wang, Hao (1); Huo, Youhui (1); Zhang, Hongbo (2)
Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) China Astronaut Research and Training Center, Beijing, China
Corresponding author:Wang, Hao(wanghao@opt.ac.cn)
Source title:ACM International Conference Proceeding Series
Abbreviated source title:ACM Int. Conf. Proc. Ser.
Part number:1 of 1
Issue title:Proceedings of 2021 Workshop on Algorithm and Big Data, WABD 2021
Issue date:March 12, 2021
Publication year:2021
Pages:40-44
Article number:3456392
Language:English
ISBN-13:9781450389945
Document type:Conference article (CA)
Conference name:2021 Workshop on Algorithm and Big Data, WABD 2021
Conference date:March 12, 2021 - March 14, 2021
Conference location:Fuzhou, China
Conference code:169506
Publisher:Association for Computing Machinery
Abstract:

This paper proposes a dynamic range model and algorithm that analyzes several key factors that affect the dynamic range of imaging equipment. Through this model and algorithm, we analyze several modules that affect the dynamic range of the system, including sensor noise, AD conversion noise, analog gain, digital gain and mapping, and give the quantitative relationships which are used to guide designers to design high performance dynamic range imaging equipment. According to the model and algorithm, a high performance dynamic range imaging equipment can be designed. A hardware extension method based on multi-slope integration is proposed, and the experimental results show that this method is an effective dynamic range expansion method.
© 2021 ACM.
Number of references:10
Main heading:Big data
Controlled terms:Computer applications - Computer programming
Uncontrolled terms:Dynamic range - Effective dynamics - Hardware extension - Imaging equipment - Model and algorithms - ON dynamics - Performance dynamics - Sensor noise
Classification code:723 Computer Software, Data Handling and Applications
DOI:10.1145/3456389.3456392

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213610857910
Title:Wideband low-profile dual-polarized dielectric patch antenna with metallic pins
Authors:Z.-X., Cao; L., Zhang; H., Wang; H., Lu; J., Liu; Y., Qiu
Author affiliation:(1) National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an, China; (2) Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an, China
Corresponding author:Wang, Hao(wanghao@opt.ac.cn)
Source title:Microwave and Optical Technology Letters
Abbreviated source title:Microwave Opt Technol Lett
Issue date:2021
Publication year:2021
Language:English
ISSN:08952477
E-ISSN:10982760
CODEN:MOTLEO
Document type:Article in Press
Publisher:John Wiley and Sons Inc
Abstract:

In this article, a lowprofile dual-polarized dielectric patch antenna (DPA) using TM101 and TM121 modes is proposed for achieving the impedance bandwidth (BW) enhancement. By introducing four metallic pins in a dielectric patch resonator (DPR), the TM121 mode is shifted to low frequencies while TM101 mode is shifted to high frequencies. Therefore, the two modes can be close to each other for obtaining wide working bandwidth. Moreover, two orthogonal aperture-coupled feeders are employed to excite the proposed DPR to realize the dual polarization. Finally, the proposed antenna is fabricated and measured. The simulated and measured results show that the 10 dB impedance matching bandwidth is 15.2% (5.05–5.87 GHz), while maintaining the low-profile characteristics with the height of 0.07λ0 (λ0 is free space wavelength at the center frequency f0). In addition, the antenna achieved a peak gain of 8.55 dBi in the operating frequency.
© 2021 Wiley Periodicals LLC.
Number of references:22
Main heading:Microstrip antennas
Controlled terms:Bandwidth - Electric impedance - Microwave antennas - Slot antennas
Uncontrolled terms:Aperture coupled - Center frequency - Dual-polarizations - Free-space wavelengths - High frequency HF - Impedance bandwidths - Measured results - Operating frequency
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 716.1 Information Theory and Signal Processing
Numerical data indexing:Decibel 1.00e+01dB, Decibel_Isotropic 8.55e+00dBi
DOI:10.1002/mop.33036

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212210446530
Title:China’s Mars Exploration Mission and Science Investigation????(Open Access)
Authors:Li, Chunlai (1, 2); Zhang, Rongqiao (3); Yu, Dengyun (4); Dong, Guangliang (5); Liu, Jianjun (1, 2); Geng, Yan (3); Sun, Zezhou (6); Yan, Wei (1); Ren, Xin (1); Su, Yan (1, 2); Zuo, Wei (1, 2); Zhang, Tielong (7, 8); Cao, Jinbin (9); Fang, Guangyou (10); Yang, Jianfeng (11); Shu, Rong (12); Lin, Yangting (13); Zou, Yongliao (14); Liu, Dawei (1); Liu, Bin (1); Kong, Deqing (1); Zhu, Xinying (1); Ouyang, Ziyuan (1, 15)
Author affiliation:(1) Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing; 100101, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Lunar Exploration and Space Engineering Center, Beijing; 100190, China; (4) China Aerospace Science and Technology Corporation, Beijing; 100048, China; (5) Beijing Institute of Tracking and Telecommunications Technology, Beijing; 100094, China; (6) Beijing Institute of Spacecraft System Engineering, Beijing; 100094, China; (7) University of Science and Technology of China, Hefei; 230026, China; (8) Space Research Institute, Austrian Academy of Sciences, Graz, Austria; (9) Beihang University, Beijing; 100191, China; (10) Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100190, China; (11) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (12) Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China; (13) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing; 100029, China; (14) State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China; (15) Institute of Geochemistry, Chinese Academy of Sciences, Guiyang; 550081, China
Corresponding author:Li, Chunlai(licl@nao.cas.cnemailliujj@nao.cas.cn)Liu, Jianjun(liujj@nao.cas.cn)
Source title:Space Science Reviews
Abbreviated source title:Space Sci Rev
Volume:217
Issue:4
Issue date:June 2021
Publication year:2021
Article number:57
Language:English
ISSN:00386308
E-ISSN:15729672
CODEN:SPSRA4
Document type:Journal article (JA)
Publisher:Springer Science and Business Media B.V.
Abstract:

China’s first Mars exploration mission (HuoXing-1) has been named as ‘Tianwen-1’ meaning Heaven Inquiry. Tianwen-1 was launched on July 23, 2020. In this paper, the scientific objectives of earlier and current Mars exploration missions worldwide are reviewed, and the scientific objectives, payloads and preliminary scientific investigation plan of China’s first Mars exploration mission are introduced, and expected scientific achievements are analyzed.
© 2021, The Author(s).
Number of references:38
Main heading:Martian surface analysis
Controlled terms:Astronomy - Astrophysics
Uncontrolled terms:Mars exploration - Scientific achievements - Scientific investigation - Scientific objectives
Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena
DOI:10.1007/s11214-021-00832-9

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Hybrid Gold

Accession number:6291744
Title:Tilt Correction Toward Building Detection of Remote Sensing Images
Authors:Liu, Kang (1, 5); Jiang, Zhiyu (2); Xu, Mingliang (3); Perc, Matjaz (4); Li, Xuelong (2)
Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) Key Laboratory of Intelligent Interaction and Applications, The School of Artificial Intelligence, Optics and Electronics, Northwestern Polytechnical University, Xi'an, China; (3) School of Information Engineering, Zhengzhou University, Zhengzhou, China; (4) Faculty of Natural Sciences and Mathematics, University of Maribor, Maribor, Slovenia; (5) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Li, Xuelong(li@nwpu.edu.cn)
Source title:IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Abbreviated source title:IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens.
Volume:14
Issue date:2021
Publication year:2021
Pages:5854-5866
Article number:9440788
Language:English
ISSN:19391404
E-ISSN:21511535
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Building detection is a crucial task in the field of remote sensing, which can facilitate urban construction planning, disaster survey, and emergency landing. However, for large-size remote sensing images, the great majority of existing works have ignored the image tilt problem. This problem can result in partitioning buildings into separately oblique parts when the large-size images are partitioned. This is not beneficial to preserve semantic completeness of the building objects. Motivated by the above fact, we first propose a framework for detecting objects in a large-size image, particularly for building detection. The framework mainly consists of two phases. In the first phase, we particularly propose a tilt correction (TC) algorithm, which contains three steps: texture mapping, tilt angle assessment, and image rotation. In the second phase, building detection is performed with object detectors, especially deep-neural-network-based methods. Last but not least, the detection results will be inversely mapped to the original large-size image. Furthermore, a challenging dataset named Aerial Image Building Detection is contributed for the public research. To evaluate the TC method, we also define an evaluation metric to compute the cost of building partition. The experimental results demonstrate the effects of the proposed method for building detection.
© 2008-2012 IEEE.
Number of references:59
Controlled terms:algorithm - building - correction - detection method - image analysis - image classification - remote sensing
Classification code:71.8.5.4 Remote sensing: numerical and image analysis
DOI:10.1109/JSTARS.2021.3083481
Funding text:This work was supported in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, in part by theNationalNatural Science Foundation of China underGrant 61871470 and Grant 62001397, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2020JQ-212, and in part by the Open-Ended Foundation of National Radar Signal Processing Laboratory under Grant 61424010207

 

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213410791987
Title:Systematic Research on Measuring Acceleration of Gravity by Laser Interferometry????(Open Access)
Authors:Dang, Chun (1); Li, Jing (1); Tang, Jie (2)
Author affiliation:(1) College of Mathematics and Physics, Huaiyin Institute of Technology, Huai'an, China; (2) Xi'An Institute of Optics and Precision Machinery Chinese Academy of Sciences, Xi'an, China
Corresponding author:Dang, Chun(chundang2020@hyit.edu.cn)
Source title:Journal of Physics: Conference Series
Abbreviated source title:J. Phys. Conf. Ser.
Volume:1982
Part number:1 of 1
Issue:1
Issue title:2021 2nd International Conference on Artificial Intelligence and Information Systems, ICAIIS 2021
Issue date:August 2, 2021
Publication year:2021
Article number:012146
Language:English
ISSN:17426588
E-ISSN:17426596
Document type:Conference article (CA)
Conference name:2021 2nd International Conference on Artificial Intelligence and Information Systems, ICAIIS 2021
Conference date:May 28, 2021 - May 30, 2021
Conference location:Chongqing, Virtual, China
Conference code:171060
Publisher:IOP Publishing Ltd
Abstract:

Gravity acceleration is an important physical quantity, and its precise measurement results have important applications in practice. According to the principle of measuring gravity acceleration in college physics experiment, a scheme of measuring gravity acceleration by laser interferometry is designed, and the main sources and sizes of experimental errors are analyzed and calculated. Compared with the common simple pendulum method and falling body method, the theoretical results show that our measurement method has higher precision and is feasible to accurately measure the acceleration of gravity.
© Published under licence by IOP Publishing Ltd.
Number of references:4
Main heading:Acceleration measurement
Controlled terms:Acceleration - Artificial intelligence - Gravitation - Information systems - Information use - Laser interferometry
Uncontrolled terms:Experimental errors - Gravity acceleration - Measurement methods - Physical quantities - Physics experiments - Precise measurements - Simple pendulums - Systematic research
Classification code:723.4 Artificial Intelligence - 741.3 Optical Devices and Systems - 903.3 Information Retrieval and Use - 931.5 Gravitation, Relativity and String Theory - 943.2 Mechanical Variables Measurements
DOI:10.1088/1742-6596/1982/1/012146

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20211610220311
Title:A comparison of neural networks algorithms for EEG and sEMG features based gait phases recognition
Authors:Wei, Pengna (1); Zhang, Jinhua (1); Tian, Feifei (2, 3); Hong, Jun (1)
Author affiliation:(1) The Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing, China
Corresponding author:Zhang, Jinhua(jjshua@mail.xjtu.edu.cn)
Source title:Biomedical Signal Processing and Control
Abbreviated source title:Biomed. Signal Process. Control
Volume:68
Issue date:July 2021
Publication year:2021
Article number:102587
Language:English
ISSN:17468094
E-ISSN:17468108
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

Surface electromyography (sEMG) and electroencephalogram (EEG) can be utilized to discriminate gait phases. However, the classification performance of various combination methods of the features extracted from sEMG and EEG channels for seven gait phase recognition has yet to be discussed. This study investigates the effectiveness of various dimensions of feature sets with different neural network algorithms in multiclass discrimination of gait phases. There are thirty-seven feature sets (slope sign change (SSC) of eight sEMG and twenty-one EEG channels, mean absolute value (MAV) of eight sEMG channels) and three classifiers (Linear Discriminant Analysis (LDA), K-nearest neighbor (KNN), Kernel Support Vector Machine (KSVM)) were utilized. The thirty-seven one-dimensional and six two-dimensional feature sets were applied to LDA and KNN, twenty-one-dimensional and thirty-seven-dimensional feature sets were applied to three optimized KSVM for gait phase recognition. We found that thirty-seven-dimensional feature sets with grid search KSVM achieved the highest classification accuracy (98.56 ± 1.34 %) and the time consumption was 26.37 s. The average time consumption of two-dimensional feature sets with KNN was the shortest (0.33 s). The SSC of sEMG with wider values distributions than others obtained a high performance. This indicates the wider the value distribution of features, the better accuracy of gait recognition. The findings suggest that a multi-dimensional feature set composed of EEG and sEMG features with KSVM achieved good performance. Considering execution time and recognition rate, two-dimensional feature sets with KNN are suitable for online gait recognition, thirty-seven-dimensional feature sets with KSVM are more likely to be used for off-line gait analysis.
© 2021 Elsevier Ltd
Number of references:40
Main heading:Electroencephalography
Controlled terms:Discriminant analysis - Gait analysis - Learning algorithms - Nearest neighbor search - Pattern recognition - Support vector machines
Uncontrolled terms:Electroencephalogram - Feature dimensions - Feature-classifier combination - Features sets - Gait phase recognition - Gait phasis - Gait-phase - Support vectors machine - Surface electromyography
Classification code:461.3 Biomechanics, Bionics and Biomimetics - 461.6 Medicine and Pharmacology - 723 Computer Software, Data Handling and Applications - 723.4.2 Machine Learning - 903.1 Information Sources and Analysis - 921.5 Optimization Techniques - 922 Statistical Methods
Numerical data indexing:Percentage 9.856E+01%, Time 2.637E+01s, Time 3.30E-01s
DOI:10.1016/j.bspc.2021.102587
Funding details: Number: 61400030701, Acronym: -, Sponsor: -;Number: sxzy022019050, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work was supported by the Fundamental Research Funds for the Central Universities [grant numbers sxzy022019050 ] and the Equipment Advance Research Foundation of China [grant numbers 61400030701 ].

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310144189
Title:Using Triple Collocation Observations to Estimate Satellite Measurement Noise
Authors:Chen, Jun (1); Quan, Wenting (2); Wang, Kexin (3); Han, Qijing (4); Liu, Jia (5); Xing, Qianguo (6); Xu, Na (7)
Author affiliation:(1) School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China (e-mail: chenjun@xjtu.edu.cn); (2) Shaanxi Meteorological Service Center of Agricultural Remote Sensing and Economic Crop, Xi'an 71000, China.; (3) School of Ocean Sciences, China University of Geosciences, Beijing 100083, China.; (4) School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China.; (5) Key Laboratory of Spectral Imaging Technology of CAS, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an 71000, China.; (6) Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.; (7) National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China (e-mail: xuna@cma.gov.cn)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Issue date:2021
Publication year:2021
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Knowing how much measurement noise is in a signal is critical for evaluating the overall performance of a satellite observation. We developed a triple collocation observation (TCO) algorithm for estimating measurement noise by collocation comparing the local deviations of three satellite data sets. When we evaluated our algorithm with a synthetic data set, the results showed that the algorithm effectively derived measurement noise from satellite signals despite the many intermission signal differences among the satellites. The TCO algorithm produced <6.66% uncertainty in the measurement noise estimates that we derived from the synthetic data set. In addition, to maximally isolate measurement noise from ocean color images, we developed a set of data quality control criteria to apply when identifying synchronous pixel pairs. Using images from the Medium Resolution Spectral Imager II (MERSI II), the Visible Infrared Imaging Radiometer Suite (VIIRS), and the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments, we applied our data quality control criteria and found that the TCO algorithm produced measurement noise consistent with the measured prelaunch or specifications for VIIRS and MERSI II instrument noise. However, the TCO measurement noise was significantly lower than the spaced MODIS noise because MODIS's extended service time likely produced instrument degradation. Overall, MODIS performed better than MERSI II but worse than VIIRS. Furthermore, we found that the residual error in remote sensing reflectance exponentially decreased as the measurement signal-to-noise ratio (MSNR) increased. Because of this exponential relationship, the MSNR should not be lower than 181 to achieve the <5% uncertainty goal of remote sensing reflectance at 443 nm that NASA proposed. Our results suggest that the TCO algorithm is an effective approach for comprehensively estimating and comparing instrument performance.
IEEE
Main heading:Image quality
Controlled terms:NASA - Quality control - Radiometers - Reflection - Remote sensing - Satellites - Signal to noise ratio - Spectroscopy - Thermography (imaging) - Uncertainty analysis
Uncontrolled terms:Effective approaches - Instrument performance - Medium resolution spectral imager - Moderate resolution imaging spectroradiometer - Remote-sensing reflectance - Satellite measurements - Satellite observations - Visible infrared imaging radiometer suites
Classification code:655.2 Satellites - 716.1 Information Theory and Signal Processing - 742.1 Photography - 913.3 Quality Assurance and Control - 922.1 Probability Theory - 944.7 Radiation Measuring Instruments
Numerical data indexing:Size 4.43e-07m
DOI:10.1109/TGRS.2021.3060781

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310151869
Title:Over 10 W linearly polarized supercontinuum directly produced in an erbium-doped fiber MOPA seeded with stretched soliton
Authors:Shen, Rong (1); Fang, Hong (1); Zhao, Junqing (2); Ouyang, Deqin (2); Wang, Meng (2); Wu, Xu (2); Ruan, Shuangchen (2)
Author affiliation:(1) School of Science, Xi’an Technological University, Xi’an; 710021, China; (2) Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen Technology University, Shenzhen; 518118, China
Corresponding author:Zhao, Junqing(junqingzhao@outlook.com)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:2
Issue date:January 10, 2021
Publication year:2021
Pages:257-263
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:We experimentally achieve over 10 W linearly polarized supercontinuum (SC) generation in a polarization-maintaining (PM) erbium-doped fiber (EDF) master oscillator power-amplifier (MOPA). The house-built PM seeding EDF laser can deliver ∼209 fs soliton around ∼1563.7 nm, which is then stretched to >15 ps using a long piece of normal-dispersion fiber. The wideband spectrum of the ultrashort seeding soliton facilitates the further spectral broadening with nonlinear effects. The soliton stretching decelerates the peak power increase, thus facilitating higher amplified average power. After several stages of pre-amplification, the stretched soliton is fed into the main amplifier constructed with PM large mode area fibers. The output average power is finally amplified to ∼11.51 W. The corresponding spectrum spans from ∼1450 to ∼2200 nm, indicating that SC is formed due to the induced strong nonlinear effects. The polarization extinction ratio at the output reaches over 18 dB. The PM characteristic potentially enhances the system’s resistance to environmental disturbances and eliminates instabilities relating to polarization-mode coupling. Our result represents, so far, the highest SC power directly produced in an EDF MOPA, to the best of our knowledge, especially in a linearly polarized manner. This also suggests a scheme for powerful SC generation that employs direct laser diode pumping and duration-managed pulse seeding.
© 2021 Optical Society of America
Number of references:37
Main heading:Erbium doped fiber amplifiers
Controlled terms:Erbium - Fibers - Optical phase conjugation - Optical pumping - Polarization - Power amplifiers - Solitons
Uncontrolled terms:Environmental disturbances - Erbium doped fibers - Large mode area fiber - Master oscillator power amplifiers - Polarization extinction ratio - Polarization maintaining - Polarization mode coupling - Spectral broadening
Classification code:547.2 Rare Earth Metals - 713.1 Amplifiers - 741 Light, Optics and Optical Devices
Numerical data indexing:Decibel 1.80e+01dB, Power 1.00e+01W
DOI:10.1364/AO.411860
Funding details: Number: 61905146, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61935014, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (61905146, 61935014).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210409828985
Title:Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an
Authors:Huige, Di (1); Siwen, Li (1); Yun, Yuan (1); Dengxin, Hua (1); jianyu, Wang (2)
Author affiliation:(1) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China; (2) Key Laboratory of Active Opto-Electronics Technology, Chinese Academy of Sciences, Shanghai; 200083, China
Corresponding author:Dengxin, Hua(dengxinhua@xaut.edu.cn)
Source title:Atmospheric Environment
Abbreviated source title:Atmos. Environ.
Volume:247
Issue date:February 15, 2021
Publication year:2021
Article number:118215
Language:English
ISSN:13522310
E-ISSN:18732844
CODEN:AENVEQ
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:To understand the characteristics of atmospheric pollution in Xi'an, China, the vertical structure of aerosols and meteorological data (temperature and relative humidity) during atmospheric pollution processes were obtained and studied. Lidar and radiosonde data were used for analyses of atmospheric pollution. Polarization lidar was used to study the vertical distribution and optical properties of aerosols during haze and dust processes that occurred in 2015–2016. The planetary boundary layer height (PBLH) and types of aerosol particles were retrieved from polarization lidar. A case study shows that a low PBLH and complex vertical distributions of aerosols, temperature and relative humidity (RH) were the main structural characteristics of haze days. The backscatter coefficient exceeded 0.015 km−1·Sr−1, while the linear particle depolarization ratio was relatively small. A large depolarization ratio above the haze layer, which induces the existence of floating dust, was observed by polarization lidar. Compared with those of haze processes, the vertical aerosol and temperature distributions of dust processes were different. Statistical analyses of the PBLH, temperature inversion, RH and near-surface aerosol concentration were also presented. A lower PBLH, lower average lapse rate of temperature within the PBL, and higher RH were found when haze pollution occurred. An inversion at the top of the boundary layer aggravates ground pollution, while there is not always a temperature inversion when haze occurs in Xi'an. Together, a lower PBLH and lower average lapse rate of temperature weaken the vertical diffusion of pollutants. Decreased vertical diffusion should be the main reason for the formation and persistence of pollution in Xi'an. Increased RH was the catalyst for haze pollution. The aggravation of haze was usually accompanied by an increase in RH, and the decline of haze processes was also accompanied by a decrease or increase (>90%) in RH.
© 2021 Elsevier Ltd
Number of references:30
Main heading:Air pollution
Controlled terms:Aerosols - Atmospheric humidity - Atmospheric structure - Atmospheric temperature - Boundary layer flow - Boundary layers - Climatology - Depolarization - Dust - Optical properties - Optical radar - Particles (particulate matter) - Polarization
Uncontrolled terms:Backscatter coefficients - Meteorological factors - Optical properties of aerosols - Planetary boundary layers - Structural characteristics - Temperature and relative humidity - Temperature inversions - Vertical distributions
Classification code:443 Meteorology - 443.1 Atmospheric Properties - 451 Air Pollution - 451.1 Air Pollution Sources - 631.1 Fluid Flow, General - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 951 Materials Science
DOI:10.1016/j.atmosenv.2021.118215
Funding details: Number: 41627807, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61875163, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by grants from National Natural Science Foundation of China (41627807, 61875163), and Key Laboratory Open Project Fund Chinese academy of sciences (AOE 2017-1).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710245631
Title:Attention-Based Multi-Branch Network for Low-Light Image Enhancement
Authors:Jiao, Yin (1, 2); Zheng, Xiangtao (2); Lu, Xiaoqiang (2)
Author affiliation:(1) University of Chinese Academy of Sciences, Beijing, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology Cas, Xi'an, China
Source title:2021 IEEE 2nd International Conference on Big Data, Artificial Intelligence and Internet of Things Engineering, ICBAIE 2021
Abbreviated source title:IEEE Int. Conf. Big Data, Artif. Intell. Internet Things Eng., ICBAIE
Part number:1 of 1
Issue title:2021 IEEE 2nd International Conference on Big Data, Artificial Intelligence and Internet of Things Engineering, ICBAIE 2021
Issue date:March 26, 2021
Publication year:2021
Pages:401-407
Article number:9389960
Language:English
ISBN-13:9780738131221
Document type:Conference article (CA)
Conference name:2nd IEEE International Conference on Big Data, Artificial Intelligence and Internet of Things Engineering, ICBAIE 2021
Conference date:March 26, 2021 - March 28, 2021
Conference location:Nanchang, China
Conference code:168280
Sponsor:IEEE
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Low-light conditions make the obtained images suffer a series of degradation, such as low contrast, noise interference and color distortion. Many previous learning-based methods have made remarkable progress, but they may still produce unsatisfactory results for ignoring noise in low-light regions. An attention-based multi-branch network is proposed, which can adequately enhance the image and suppress latent noise. The proposed method firstly estimates illumination component and reflectance component through a decomposition process. Then the illumination component is brightened to reconstruct the global lighting distribution, and the reflectance component is restored to remove noise and maintain details. A lightweight but effective attention block is employed to guide the restoration of the reflectance component, so as to concentrate on the distribution of lighting in different regions and effectively suppress noise in the dim environment. Extensive experiments on several datasets show the proposed method can achieve good results compared with classic and state-of-the-art methods.
© 2021 IEEE.
Number of references:31
Main heading:Image enhancement
Controlled terms:Artificial intelligence - Big data - Internet of things - Lighting - Reflection - Restoration
Uncontrolled terms:Decomposition process - Illumination components - Learning-based methods - Lighting distribution - Low light conditions - Noise interference - Reflectance components - State-of-the-art methods
Classification code:723 Computer Software, Data Handling and Applications
DOI:10.1109/ICBAIE52039.2021.9389960

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212410500799
Title:A Bi1/2K1/2TiO3-based ergodic relaxor ceramic for temperature-stable energy storage applications????(Open Access)
Authors:Wei, Yongxing (1); Zhang, Ning (1); Jin, Changqing (1); Shen, Jiahao (1); Xie, Jiahuan (1); Dai, Zhonghua (2); Hu, Lin (1); Zeng, Yiming (3); Jian, Zengyun (1)
Author affiliation:(1) Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an; 710021, China; (2) Electronic Materials Research Lab, Key Laboratory of Ministry of Education and International Centre for Dielectric Research, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (3) State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming; 650106, China
Corresponding author:Wei, Yongxing(weiyongxing@xatu.edu.cn)
Source title:Materials and Design
Abbreviated source title:Mater. Des.
Volume:207
Issue date:September 2021
Publication year:2021
Article number:109887
Language:English
ISSN:02641275
E-ISSN:18734197
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

Relaxor ferroelectrics are attractive for the high energy storage density. However, the polarization responses of most relaxor ferroelectrics are sensitive to temperature, thus leading to thermal-dependent energy storage properties. In this work, 0.5Bi1/2K1/2TiO3–0.5SrTiO3 (0.5BKT–0.5ST) and 0.95(0.5Bi1/2K1/2TiO3–0.5SrTiO3)–0.05Bi(Zn1/2Ti1/2)O3 (BKT–ST–0.05BZT) ceramics were prepared using the solid-state reaction method. Both compositions showed an average cubic structure, with a relaxor-type dielectric anomaly. The rather low remanent polarization and delayed saturated polarization indicated the formation of the ergodic polar nano regions. Benefitting from the Bi(Zn1/2Ti1/2)O3 modification, the recoverable energy storage density (Wrec) reached 3.07 J/cm3 because of the enhanced polarization and increased bandgap. Meanwhile, BKT–ST–0.05BZT exhibited a high storage efficiency (η > 88%). When the specimen was heated from 30 °C to 150 °C, Wrec under the maximum electric field Em of 150 kV/cm varied from 1.58 to 1.63 J/cm3 (＜ ±2%).
© 2021
Number of references:49
Main heading:Energy storage
Controlled terms:Ceramic materials - Electric fields - Ferroelectric materials - Polarization - Solid state reactions - Thermodynamic stability
Uncontrolled terms:Bi1/2K1/2TiO3 - Energy storage dielectric - Ergodic relaxor ceramic - Ergodics - PNR - Relaxor ferroelectric - Relaxors - Temperature stable - Thermal - TiO
Classification code:525.7 Energy Storage - 641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 802.2 Chemical Reactions - 812.1 Ceramics
Numerical data indexing:Electric field strength 1.50E+04V/m, Energy 1.58E+00J to 1.63E+00J, Energy 3.07E+00J, Percentage 2.00E+00%, Percentage 8.80E+01%, Temperature 2.00E+00K, Temperature 3.03E+02K to 4.23E+02K
DOI:10.1016/j.matdes.2021.109887
Funding details: Number: 11704301, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAGDXJJ18006,XAGDXJJ200214, Acronym: XJTU, Sponsor: Xi’an Jiaotong University;Number: 2018JQ1092,2019JM414, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 19JK0398, Acronym: -, Sponsor: Education Department of Shaanxi Province;Number: -, Acronym: XATU, Sponsor: Xi'an Technological University;
Funding text:This work was financially supported by the National Natural Science Foundation of China (Project No. 11704301), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ1092, 2019JM414), the Shaanxi Provincial Education Department Program (Program No.19JK0398), and the President's Funds of Xi'an Technological University (Project No. XAGDXJJ18006, XAGDXJJ200214).This work was financially supported by the National Natural Science Foundation of China (Project No. 11704301), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ1092, 2019JM414), the Shaanxi Provincial Education Department Program (Program No.19JK0398), and the President’s Funds of Xi’an Technological University (Project No. XAGDXJJ18006, XAGDXJJ200214).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20201808588045
Title:Heterogeneous Sensor-Based Target Tracking With Constant Time Delay
Authors:Wang, Qilong (1); Zhang, Yu (2)
Author affiliation:(1) School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an; 710082, China; (2) Beijing Aerospace Times Optical-Electronic Technology CO, Ltd, China Aerospace Science and Technology Corp, Beijing; 100094, China
Corresponding author:Wang, Qilong(areslong@126.com)
Source title:International Journal of Aeronautical and Space Sciences
Abbreviated source title:Int. J. Aeronauti. Space Sci.
Volume:22
Issue:1
Issue date:February 2021
Publication year:2021
Pages:186-194
Language:English
ISSN:2093274X
E-ISSN:20932480
Document type:Journal article (JA)
Publisher:Korean Society for Aeronautical and Space Sciences
Abstract:Aiming to address the problem of constant-step-lag in-sequence measurements (CISM) in the process of heterogeneous sensor tracking, an Unscented Transformation-based CISM indirect update algorithm is proposed in this paper. First, based on the classical A1 algorithm, Unscented Transformation is applied to the nonlinear measurement equation to solve the computation of nonlinear systems. This method does not need to solve the Jacobian matrix or Hessian matrix of nonlinear equations. Second, combined with the complementarity of information from heterogeneous sensor systems, CISM is further analyzed, and an indirect update algorithm is proposed to obtain the approximate estimate of the current time of the delay information, which is substituted into UT-A1 to complete a delay information update algorithm that is suitable for the heterogeneous sensor system in this paper. Finally, the experimental results show that the UT-CISM indirect update algorithm can effectively improve the real-time capability and accuracy of the time-delay sensor system in this paper.
© 2020, The Korean Society for Aeronautical & Space Sciences.
Number of references:28
Main heading:Target tracking
Controlled terms:Jacobian matrices - Mathematical transformations - Nonlinear equations - Time delay - Timing circuits
Uncontrolled terms:Constant time delays - Hessian matrices - Heterogeneous sensors - Information updates - Nonlinear measurement - Real time capability - Unscented transformations - Update algorithms
Classification code:713 Electronic Circuits - 713.4 Pulse Circuits - 921.1 Algebra - 921.3 Mathematical Transformations
DOI:10.1007/s42405-020-00276-5

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213710897470
Title:Hierarchical Edge Refinement Network for Saliency Detection
Authors:Song, Dawei (1); Dong, Yongsheng (2); Li, Xuelong (2)
Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) School of Artificial Intelligence, Optics and Electronics (IOPEN), Northwestern Polytechnical University, Xi'an, China
Corresponding author:Song, Dawei(daweisong96@163.com)
Source title:IEEE Transactions on Image Processing
Abbreviated source title:IEEE Trans Image Process
Volume:30
Issue date:2021
Publication year:2021
Pages:7567-7577
Article number:9526284
Language:English
ISSN:10577149
E-ISSN:19410042
CODEN:IIPRE4
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

At present, most saliency detection methods are based on fully convolutional neural networks (FCNs). However, FCNs usually blur the edges of salient objects. Due to that, the multiple convolution and pooling operations of the FCNs will limit the spatial resolution of the feature maps. To alleviate this issue and obtain accurate edges, we propose a hierarchical edge refinement network (HERNet) for accurate saliency detection. In detail, the HERNet is mainly composed of a saliency prediction network and an edge preserving network. Firstly, the saliency prediction network is used to roughly detect the regions of salient objects and is based on a modified U-Net structure. Then, the edge preserving network is used to accurately detect the edges of salient objects, and this network is mainly composed of the atrous spatial pyramid pooling (ASPP) module. Different from the previous indiscriminate supervision strategy, we adopt a new one-to-one hierarchical supervision strategy to supervise the different outputs of the entire network. Experimental results on five traditional benchmark datasets demonstrate that the proposed HERNet performs well when compared with the state-of-the-art methods.
© 1992-2012 IEEE.
Number of references:62
Main heading:Convolutional neural networks
Controlled terms:Convolution
Uncontrolled terms:Benchmark datasets - Edge preserving - Multiple convolution - Saliency detection - Salient objects - Spatial pyramids - Spatial resolution - State-of-the-art methods
Classification code:716.1 Information Theory and Signal Processing
DOI:10.1109/TIP.2021.3106798

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211010019659
Title:Spectral-Spatial Joint Sparse NMF for Hyperspectral Unmixing
Authors:Dong, Le (1, 3); Yuan, Yuan (2, 4); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 10119, China; (2) School of Computer Science, Northwestern Polytechnical University, Xi'an; 710072, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Volume:59
Issue:3
Issue date:March 2021
Publication year:2021
Pages:2391-2402
Article number:9141345
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:The nonnegative matrix factorization (NMF) combining with spatial-spectral contextual information is an important technique for extracting endmembers and abundances of hyperspectral image (HSI). Most methods constrain unmixing by the local spatial position relationship of pixels or search spectral correlation globally by treating pixels as an independent point in HSI. Unfortunately, they ignore the complex distribution of substance and rich contextual information, which makes them effective in limited cases. In this article, we propose a novel unmixing method via two types of self-similarity to constrain sparse NMF. First, we explore the spatial similarity patch structure of data on the whole image to construct the spatial global self-similarity group between pixels. And according to the regional continuity of the feature distribution, the spectral local self-similarity group of pixels is created inside the superpixel. Then based on the sparse expression of the pixel in the subspace, we sparsely encode the pixels in the same spatial group and spectral group respectively. Finally, the abundance of pixels within each group is forced to be similar to constrain the NMF unmixing framework. Experiments on synthetic and real data fully demonstrate the superiority of our method over other existing methods.
© 1980-2012 IEEE.
Number of references:60
Main heading:Pixels
Controlled terms:Factorization - Matrix algebra - Spectroscopy
Uncontrolled terms:Contextual information - Feature distribution - Hyperspectral unmixing - Local selfsimilarity - Nonnegative matrix factorization - Spatial similarity - Spectral correlation - Synthetic and real data
Classification code:921 Mathematics - 921.1 Algebra
DOI:10.1109/TGRS.2020.3006109
Funding details: Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61825603, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: QYZDB-SSW-JSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61702498,61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Manuscript received March 4, 2020; revised May 8, 2020; accepted May 31, 2020. Date of publication July 15, 2020; date of current version February 25, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61772510 and Grant 61702498, in part by the National Natural Science Foundation for Distinguished Young Scholars under Grant 61825603, in part by the Young Top-Notch Talent Program of the Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, and in part by the CAS Light of West China Program under Grant XAB2017B15. (Corresponding author: Xiaoqiang Lu.) Le Dong is with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20205209675945
Title:TTH-RNN: Tensor-Train Hierarchical Recurrent Neural Network for Video Summarization
Authors:Zhao, Bin (1); Li, Xuelong (1); Lu, Xiaoqiang (2)
Author affiliation:(1) School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi'an, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Industrial Electronics
Abbreviated source title:IEEE Trans Ind Electron
Volume:68
Issue:4
Issue date:April 2021
Publication year:2021
Pages:3629-3637
Article number:9037206
Language:English
ISSN:02780046
E-ISSN:15579948
CODEN:ITIED6
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Although a recurrent neural network (RNN) has achieved tremendous advances in video summarization, there are still some problems remaining to be addressed. In this article, we focus on two intractable problems when applying an RNN to video summarization: first the extremely large feature-to-hidden matrices. Since video features are usually in a high-dimensional space, it leads to extremely large feature-to-hidden mapping matrices in the RNN model, which increases the training difficulty. Second, the deficiency in long-range temporal dependence exploration. Most videos contain thousands of frames at least, which is such a long sequence that traditional RNNs cannot deal well with. Facing the abovementioned two problems, we develop a tensor-train hierarchical recurrent neural network (TTH-RNN) for the video summarization task. It contains a tensor-train embedding layer to avert the large feature-to-hidden matrices, together with a hierarchical structure of an RNN to explore the long-range temporal dependence among video frames. Practically, the experimental results on four benchmark datasets, including SumMe, TVsum, MED, and VTW, have demonstrated the excellent performance of a TTH-RNN in video summarization.
© 1982-2012 IEEE.
Number of references:43
Main heading:Recurrent neural networks
Controlled terms:Benchmarking - Tensors - Video recording
Uncontrolled terms:Benchmark datasets - Hierarchical structures - High dimensional spaces - Long sequences - Recurrent neural network (RNN) - Temporal dependence - Video features - Video summarization
Classification code:716.4 Television Systems and Equipment - 921.1 Algebra
DOI:10.1109/TIE.2020.2979573
Funding details: Number: -, Acronym: -, Sponsor: Key Research Program of Frontier Science, Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: -, Sponsor: -;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: QYZDB-SSW-JSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: XAB2017B15, Acronym: -, Sponsor: -;Number: 61702498,61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 61772510 and Grant 61702498, in part by the Key Research Program of Frontier Sciences, CAS under Grant QYZDY-SSW-JSC044, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key R&D Program of China under Grant 2017YFB0502900, and in part by the CAS Light of West China Program under Grant XAB2017B15.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:6117458
Title:11 TOPS photonic convolutional accelerator for optical neural networks
Authors:Xu, Xingyuan (1, 9); Tan, Mengxi (1); Corcoran, Bill (2); Wu, Jiayang (1); Boes, Andreas (3); Nguyen, Thach G. (3); Chu, Sai T. (4); Little, Brent E. (5); Hicks, Damien G. (1, 6); Morandotti, Roberto (7, 8); Mitchell, Arnan (3); Moss, David J. (1)
Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC, Australia; (2) Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC, Australia; (4) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (5) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China; (6) Bioinformatics Division, Walter & Eliza Hall Institute of Medical Research, Parkville; VIC, Australia; (7) INRS-Énergie, Matériaux et Télécommunications, Varennes; QC, Canada; (8) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China; (9) Electro-Photonics Laboratory, Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC, Australia
Corresponding author:Moss, David J.(dmoss@swin.edu.au)
Source title:Nature
Abbreviated source title:Nature
Volume:589
Issue:7840
Issue date:January 7, 2021
Publication year:2021
Pages:44-51
Language:English
ISSN:00280836
E-ISSN:14764687
CODEN:NATUAS
Document type:Journal article (JA)
Publisher:Nature Research
Abstract:Convolutional neural networks, inspired by biological visual cortex systems, are a powerful category of artificial neural networks that can extract the hierarchical features of raw data to provide greatly reduced parametric complexity and to enhance the accuracy of prediction. They are of great interest for machine learning tasks such as computer vision, speech recognition, playing board games and medical diagnosis1–7. Optical neural networks offer the promise of dramatically accelerating computing speed using the broad optical bandwidths available. Here we demonstrate a universal optical vector convolutional accelerator operating at more than ten TOPS (trillions (1012) of operations per second, or tera-ops per second), generating convolutions of images with 250,000 pixels—sufficiently large for facial image recognition. We use the same hardware to sequentially form an optical convolutional neural network with ten output neurons, achieving successful recognition of handwritten digit images at 88 per cent accuracy. Our results are based on simultaneously interleaving temporal, wavelength and spatial dimensions enabled by an integrated microcomb source. This approach is scalable and trainable to much more complex networks for demanding applications such as autonomous vehicles and real-time video recognition.
© 2020, The Author(s), under exclusive licence to Springer Nature Limited.
Number of references:40
Controlled terms:accuracy assessment - analytical hierarchy process - artificial neural network - complexity - equipment - machine learning - prediction
Classification code:901 Geobase: Related Topics
DOI:10.1038/s41586-020-03063-0

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204109318719
Title:The nonlinear optical properties of two-dimensional metal-organic framework
Authors:Cheng, Xuemei (1, 2); Yao, Jingjing (1); Zhang, Hui (3); Wang, Xing (2); Bai, Jintao (1)
Author affiliation:(1) State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an; 710069, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Okinawa Institute of Science and Technology Graduate University, Okinawa; 9040495, Japan
Corresponding author:Cheng, Xuemei(xmcheng@nwu.edu.cn)
Source title:Journal of Alloys and Compounds
Abbreviated source title:J Alloys Compd
Volume:855
Issue date:February 25, 2021
Publication year:2021
Article number:157433
Language:English
ISSN:09258388
CODEN:JALCEU
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:We report the investigation on the nonlinear optical properties of two typical two-dimensional metal-organic frameworks (2D MOFs) - 2D Cu-MOF and Zn-MOF (copper/zinc 1,4-benzene dicarboxylate, CuBDC and ZnBDC) using spatial self-phase modulation (SSPM) and spatial cross-phase modulation (SXPM) methods. It is found that 2D Cu-MOF exhibits a large nonlinear optical coefficient n2=5.2010-11m2/Wandχ3=8.2410−11e.s.u. By contrast, no nonlinear optical effect was observed from 2D Zn-MOF under the same condition. The main reason is the Cu center of Cu-MOF has variable valence electrons and a vacant 3d atom orbit, which can form a conjugated system with organic ligands through the d-π interaction and therefore strengthen the nonlinear optical effect by the delocalization of π electrons. However, the Zn ion of Zn-MOF with fixed valence electrons and fully occupied d orbit makes it hard to produce observable nonlinear optical effect. Furthermore, we demonstrated the ability of 2D Cu-MOF in all-optical spatial light modulation and optical switch based on the principle of SXPM. This work sheds light on the physics of 2D MOFs in all-optical light modulation, providing an insight for rational design of 2D MOFs with high nonlinear optical coefficients in future.
© 2020 Elsevier B.V.
Number of references:45
Main heading:Nonlinear optics
Controlled terms:Carboxylation - Light modulation - Metal-Organic Frameworks - Optical properties - Optical signal processing - Organic polymers - Organometallics - Phase modulation
Uncontrolled terms:Conjugated systems - Cross phase modulation - Non-linear optical coefficients - Non-linear optical properties - Nonlinear optical effects - Spatial light modulation - Spatial self-phase modulation - Two-dimensional metals
Classification code:741.1 Light/Optics - 741.1.1 Nonlinear Optics - 802.2 Chemical Reactions - 804.1 Organic Compounds - 815.1.1 Organic Polymers
DOI:10.1016/j.jallcom.2020.157433
Funding details: Number: SKLST201906, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: 2020JM-432, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 11874299,61805200,51927804, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work is supported by the National Natural Science Foundation of China ( 61805200 , 11874299 and 51927804 ), Natural Science Foundation of Shaanxi Province (No. 2020JM-432 ), and the fund of State Key Laboratory of Transient Optics and Photonics ( SKLST201906 ).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210910015670
Title:Application of U-Net Based Multiparameter Magnetic Resonance Image Fusion in the Diagnosis of Prostate Cancer????(Open Access)
Authors:Huang, Xunan (1); Zhang, Bo (2); Zhang, Xiaoling (3); Tang, Min (3); Miao, Qiguang (1); Li, Tanping (4); Jia, Guang (1)
Author affiliation:(1) School of Computer Science and Technology, Xidian University, Xi'an; 710071, China; (2) Tangdu Hospital, Air Force Military Medical University, Xi'an; 710038, China; (3) MRI Room, Shaanxi Provincial People's Hospital, Xi'an; 710068, China; (4) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China
Corresponding author:Jia, Guang(gjia@xidian.edu.cnemailpli@xidian.edu.cn)Li, Tanping(pli@xidian.edu.cn)
Source title:IEEE Access
Abbreviated source title:IEEE Access
Volume:9
Issue date:2021
Publication year:2021
Pages:33756-33768
Article number:9360594
Language:English
E-ISSN:21693536
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Medical image fusion technology has been widely used in clinical practice by doctors to better understand lesion regions through the fusion of multiparametric medical images. This paper proposes an automated fusion method based on a U-Net. Through neural network learning, a weight distribution is generated based on the relationship between the image feature information and the multifocus training target. The MRI image pair of prostate cancer (axial T2-weighted and ADC map) is fused using a strategy based on local similarity and Gaussian pyramid transformation. Experimental results show that the fusion method can enhance the appearance of prostate cancer in terms of both visual quality and objective evaluation.
© 2013 IEEE.
Number of references:52
Main heading:Image fusion
Controlled terms:Diagnosis - Diseases - Magnetic resonance imaging - Medical imaging - Urology
Uncontrolled terms:Clinical practices - Gaussian pyramids - Local similarity - Neural network learning - Objective evaluation - Prostate cancers - Visual qualities - Weight distributions
Classification code:461.6 Medicine and Pharmacology - 723.2 Data Processing and Image Processing - 746 Imaging Techniques
DOI:10.1109/ACCESS.2021.3061078
Funding details: Number: -, Acronym: MOE, Sponsor: Ministry of Education of the People's Republic of China;
Funding text:This work was supported in part by the Xidian University Startup Fund, and in part by The Ministry of Education's free exploration fund.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211210117149
Title:Recent advancements of the lidar technique based on the Scheimpflug imaging principle (Invited)
Title of translation:基于沙氏成像原理的激光雷达技术研究进展(特邀)
Authors:Mei, Liang (1); Kong, Zheng (1); Lin, Hongze (2); Fei, Ruonan (1); Cheng, Yuan (1); Gong, Zhenfeng (1); Chen, Ke (1); Liu, Kun (1); Hua, Dengxin (1, 3)
Author affiliation:(1) School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian; 116024, China; (2) School of Automation, Hangzhou Dianzi University, Hangzhou; 310018, China; (3) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China
Corresponding author:Mei, Liang(meiliang@dlut.edu.cnemaildengxinhua@xaut.edu.cn)Hua, Dengxin(dengxinhua@xaut.edu.cn)
Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.
Volume:50
Issue:3
Issue date:March 25, 2021
Publication year:2021
Article number:20210033
Language:Chinese
ISSN:10072276
Document type:Journal article (JA)
Publisher:Chinese Society of Astronautics
Abstract:When the object plane is not parallel to the lens plane in an imaging system, if the image plane, the object plane and the lens plane intersect into a straight line—satisfying the Scheimpflug imaging principle, the imaging system can still clearly image the object and achieve infinite depth-of-focus (DoF). The newly developed Scheimpflug lidar (SLidar) technique based on the Scheimpflug imaging principle can thus utilize continuous wave diode lasers as light sources and image sensors as detectors, featuring short blind range, compact structure, low maintenance and high cost performance, etc. In recent years, the SLidar technique has gradually been applied to the fields of atmospheric environment monitoring, three-dimensional (3D) target imaging, fluorescence(hyperspectral) lidar detection, ecological studies, combustion diagnosis, and water-body optical measurements, etc. This article will thoroughly explain the basic principles of the SLidar technique, discuss latest progresses in these fields and present its perspectives.
Copyright ©2021 Infrared and Laser Engineering. All rights reserved.
Number of references:63
Main heading:Hyperspectral imaging
Controlled terms:Atmospheric structure - Continuous wave lasers - Imaging systems - Optical data processing - Optical radar - Radar target recognition
Uncontrolled terms:Atmospheric environment - Combustion diagnosis - Compact structures - Continuous-wave diode laser - Ecological studies - Optical measurement - Scheimpflug imaging - Threedimensional (3-d)
Classification code:443.1 Atmospheric Properties - 716.2 Radar Systems and Equipment - 723.2 Data Processing and Image Processing - 744.1 Lasers, General - 746 Imaging Techniques
DOI:10.3788/IRLA20210033

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213310758679
Title:Bio-Inspired Representation Learning for Visual Attention Prediction????(Open Access)
Authors:Yuan, Yuan (1); Ning, Hailong (2, 3); Lu, Xiaoqiang (2)
Author affiliation:(1) Center for Optical Imagery Analysis and Learning, School of Computer Science, Northwestern Polytechnical University, Xi'an, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Cybernetics
Abbreviated source title:IEEE Trans. Cybern.
Volume:51
Issue:7
Issue date:July 2021
Publication year:2021
Pages:3562-3575
Article number:8822602
Language:English
ISSN:21682267
E-ISSN:21682275
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Visual attention prediction (VAP) is a significant and imperative issue in the field of computer vision. Most of the existing VAP methods are based on deep learning. However, they do not fully take advantage of the low-level contrast features while generating the visual attention map. In this article, a novel VAP method is proposed to generate the visual attention map via bio-inspired representation learning. The bio-inspired representation learning combines both low-level contrast and high-level semantic features simultaneously, which are developed by the fact that the human eye is sensitive to the patches with high contrast and objects with high semantics. The proposed method is composed of three main steps: 1) feature extraction; 2) bio-inspired representation learning; and 3) visual attention map generation. First, the high-level semantic feature is extracted from the refined VGG16, while the low-level contrast feature is extracted by the proposed contrast feature extraction block in a deep network. Second, during bio-inspired representation learning, both the extracted low-level contrast and high-level semantic features are combined by the designed densely connected block, which is proposed to concatenate various features scale by scale. Finally, the weighted-fusion layer is exploited to generate the ultimate visual attention map based on the obtained representations after bio-inspired representation learning. Extensive experiments are performed to demonstrate the effectiveness of the proposed method.
© 2019 IEEE.
Number of references:60
Main heading:Behavioral research
Controlled terms:Biomimetics - Deep learning - Extraction - Feature extraction - Learning systems - Semantics
Uncontrolled terms:High contrast - High-level semantic features - Human eye - Map generation - Visual Attention - Weighted fusion
Classification code:461.8 Biotechnology - 802.3 Chemical Operations - 971 Social Sciences
DOI:10.1109/TCYB.2019.2931735
Funding details: Number: 61632018,61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61825603, Acronym: -, Sponsor: China National Funds for Distinguished Young Scientists;Number: 2017YFB0502900,XAB2017B15,XAB2017B26, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Manuscript received November 9, 2018; revised February 22, 2019, June 18, 2019, and July 11, 2019; accepted July 18, 2019. Date of publication September 2, 2019; date of current version June 23, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the CAS "Light of West China" Program under Grant XAB2017B26 and Grant XAB2017B15, in part by the National Natural Science Fund for Distinguished Young Scholars under Grant 61825603, and in part by the State Key Program of National Natural Science of China under Grant 61632018. This article was recommended by Associate Editor W. Hu. (Corresponding author: Xiaoqiang Lu.) Y. Yuan is with the Center for Optical Imagery Analysis and Learning, School of Computer Science, Northwestern Polytechnical University, Xi’an 710072, China.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20212810616373
Title:A synchronous control system designed for underwater single-photon range-gated imaging based on FPGA
Authors:Zhou, Peng (1, 2, 3); Su, Xiuqin (1, 2, 3); Wang, Jie (1, 2, 3); Wang, Shuchao (1, 2, 3); Chen, Songmao (1, 3); Zhang, Zhenyang (1, 2, 3); Zhu, Wenhua (1, 2, 3); Zhang, Xuan (1, 2, 3); Wu, Zhendong (1, 2, 3)
Author affiliation:(1) CAS Key laboratory of Space Precision Measurement Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academic of Sciences, Xi’an; 710719, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao; 266237, China
Corresponding author:Su, Xiuqin(suxiuqin@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11885
Part number:1 of 1
Issue title:International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021
Issue date:2021
Publication year:2021
Article number:118850N
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510646162
Document type:Conference article (CA)
Conference name:2021 International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021
Conference date:May 28, 2021 - May 30, 2021
Conference location:Xi'an, China
Conference code:169930
Sponsor:China Optoelectronics Industry Platform
Publisher:SPIE
Abstract:

Single-photon imaging technique is a new type of light detection and ranging (LIDAR) technology used for weak signal detection which has a high sensitivity up to single-photon energy level. It has a broad prospect of application in the field of underwater imaging. Range-gated technique has been proved to be effective in reducing the backscattering noise and improving the signal-to-noise ratio (SNR) during the data acquisition stage. The range-gated synchronous control system is a key component of the underwater single-photon imaging system. At present, most range-gated synchronous control systems have the defects of low stepping regulation precision and narrow dynamic regulating range. This paper designs a novel range-gated synchronous control system which has both a wide dynamic regulating range and a high stepping regulation precision of gating distance. It is composed of a coarse regulation part and a fine regulation part which are both based on the field programmable gate array (FPGA). The simulation results show that the dynamic range of the system’s gated distance can meet the requirement of imaging as far as 7km, and the stepping regulation precision can reach as high as 39ps, with the gate width adjustable. The system designed in this paper guarantees a high SNR data acquisition and has a strong adaptability under various distance scenarios along with extra advantages of lower cost, smaller volume and lighter weight. These features will make a great improvement in the crypticity and portability of the whole underwater single-photon imaging system.
© 2021 SPIE.
Number of references:9
Main heading:Signal to noise ratio
Controlled terms:Control systems - Data acquisition - Field programmable gate arrays (FPGA) - Imaging systems - Optical radar - Particle beams - Photons - Systems analysis - Underwater imaging
Uncontrolled terms:Dynamic range - High sensitivity - Light detection and ranging - Range-gated imaging - Single photons - Single-photon imaging - Synchronous control systems - Weak signal detection
Classification code:716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 721.2 Logic Elements - 723.2 Data Processing and Image Processing - 731.1 Control Systems - 746 Imaging Techniques - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics - 961 Systems Science
Numerical data indexing:Size 7.00e+03m, Time 3.90e-11s
DOI:10.1117/12.2602305

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204809527185
Title:Deep neural network oriented evolutionary parametric eye modeling
Authors:Zheng, Yang (1, 2); Fu, Hong (3); Li, Ruimin (1, 2); Hsung, Tai-Chiu (4); Song, Zongxi (1); Wen, Desheng (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China; (3) Department of Mathematics and Information Technology, The Education University of Hong Kong, Hong Kong; (4) Department of Computer Science, Chu Hai College of Higher Education, China
Corresponding author:Fu, Hong(hfu@eduhk.hk)
Source title:Pattern Recognition
Abbreviated source title:Pattern Recogn.
Volume:113
Issue date:May 2021
Publication year:2021
Article number:107755
Language:English
ISSN:00313203
CODEN:PTNRA8
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:Comprehensive and accurate eye modeling is crucial to a variety of applications, including human-computer interaction, assistive technologies, and medical diagnosis. However, most studies focus on the localization of one or two components of eyes, such as pupil or iris, lacking a comprehensive eye model. We propose to model an eye image by a set of parametric curves. The set of curves are plotted on an eye image to form a Contour-Eye image. A deep neural network is trained to evaluate the fitness of the Contour-Eye image. Then an evolutionary process is conducted to search the best fitting curve set, guided by the trained deep neural network. Finally, an accurate eye model with optimized parametric curves is obtained. For the algorithm evaluation, a finely annotated eye dataset denoted as FAED-50 is established by us, which contains 2,498 eye images from 50 subjects. The experimental results on the FAED-50 and the relabeled CASIA datasets and comparison with the state-of-the-art methods demonstrate the effectiveness and accuracy of the proposed parametric model.
© 2020
Number of references:52
Main heading:Neural networks
Controlled terms:Curve fitting - Deep neural networks - Diagnosis - Human computer interaction
Uncontrolled terms:Algorithm evaluation - Assistive technology - Best fitting curves - Evolutionary process - Parametric curve - Parametric modeling - State-of-the-art methods - Two-component
Classification code:461.6 Medicine and Pharmacology - 921.6 Numerical Methods
DOI:10.1016/j.patcog.2020.107755
Funding details: Number: UGC/FDS13/E01/17, Acronym: -, Sponsor: -;Number: MIT/SGA04/20–21, Acronym: EdUHK, Sponsor: Education University of Hong Kong;
Funding text:The research was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project Reference No.: UGC/FDS13/E01/17). The research was also supported by a grant from the The Education University of Hong Kong, China (MIT/SGA04/20–21).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510533305
Title:Target classification algorithms based on multispectral imaging: A review
Authors:Zeng, Zimu (1, 2); Wang, Weifeng (1); Zhang, Wenbo (1)
Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (2) University of Chinese, Academy of Sciences, China
Corresponding author:Zeng, Zimu(1281785013@qq.com)
Source title:ACM International Conference Proceeding Series
Abbreviated source title:ACM Int. Conf. Proc. Ser.
Part number:1 of 1
Issue title:2021 6th International Conference on Multimedia and Image Processing, ICMIP 2021
Issue date:January 8, 2021
Publication year:2021
Pages:12-21
Language:English
ISBN-13:9781450389167
Document type:Conference article (CA)
Conference name:6th International Conference on Multimedia and Image Processing, ICMIP 2021
Conference date:January 8, 2021 - January 10, 2021
Conference location:Zhuhai, China
Conference code:169503
Publisher:Association for Computing Machinery
Abstract:

Multispectral imaging extracts rich spectral information from targets, which greatly expands the function of traditional imaging technology. Multispectral imaging is widely used in agriculture, military, medicine, industry, and meteorology. Because of the information redundancy in multispectral images, it is necessary to reduce the dimension by pre-processing. In recent years, most of the researchers have adopted the methods of pre-processing before classification. Based on the principles of feature selection, feature transformation, and feature extraction, common dimensionality reduction methods are introduced, and the advantages and disadvantages of them are discussed. Afterwards, classification methods are divided into traditional methods and deep learning methods, and their characteristics and application prospect are discussed. Through comparison, the former are cost-effective and have the mature theories, while the latter have strong adaptability and high classification accuracy. At present, methods could be optimized from the perspective of saving computing resources and using spectral information efficiently. In the future, traditional methods will be improved and comprehensively used, while new methods with stronger adaptability and precision will be developed.
© 2021 ACM.
Number of references:62
Main heading:Learning systems
Controlled terms:Agricultural robots - Computation theory - Cost effectiveness - Deep learning - Dimensionality reduction - Feature extraction - Imaging techniques
Uncontrolled terms:Classification accuracy - Classification methods - Dimensionality reduction method - Feature transformations - Information redundancies - Multispectral imaging - Spectral information - Target classification algorithms
Classification code:721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 746 Imaging Techniques - 911.2 Industrial Economics
DOI:10.1145/3449388.3449393

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212610550244
Title:A four-channel ICCD framing camera with nanosecond temporal resolution and high spatial resolution
Authors:Fang, Yuman (1, 2); Zhang, Minrui (1); Wang, Junfeng (1); Guo, Lehui (1, 2); Liu, Xueling (1, 2); Lu, Yu (1); Tian, Jinshou (1, 3)
Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an, China; (2) College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, Beijing, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, China
Corresponding author:Tian, Jinshou(tianjs@opt.ac.cn)
Source title:Journal of Modern Optics
Abbreviated source title:J. Mod. Opt.
Volume:68
Issue:13
Issue date:2021
Publication year:2021
Pages:661-669
Language:English
ISSN:09500340
E-ISSN:13623044
CODEN:JMOPEW
Document type:Journal article (JA)
Publisher:Taylor and Francis Ltd.
Abstract:

In this paper, a high spatial resolution, high gating speed framing camera capable of four separate two-dimensional images is designed and tested. A mirror-based image splitter has been designed and developed to provide a separate image for each arm with equal path length and equal intensity splitting while having a spectral flat response. Fast gating of a single frame is accomplished by using a proximity-focused microchannle-plate image-intensifier (MCPII) gated by a MOSFET-based pulse module with adjustable gate width from 3 ns to D.C. operation. Multiple frames are obtained by using multiple gated tubes with time intervals between consecutive frames can be adjusted flexibly. Its spatial resolution reaches 36.5 lp/mm with each frame having a 4.6-ns gate width. Furthermore, a three-dimensional MCPII model is developed to investigate the transit time and spatial resolution of the proximity-focused MCPII based on the Finite Integral Technique (FIT) and Monte Carlo method (M–C method).
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
Number of references:17
Main heading:Monte Carlo methods
Controlled terms:Cameras - Image resolution - MOSFET devices
Uncontrolled terms:Finite integral techniques - Framing Camera - High spatial resolution - Image splitters - Multiple-frame - Spatial resolution - Temporal resolution - Two dimensional images
Classification code:714.2 Semiconductor Devices and Integrated Circuits - 742.2 Photographic Equipment - 922.2 Mathematical Statistics
Numerical data indexing:Time 4.60e-09s
DOI:10.1080/09500340.2021.1937735

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310136128
Title:Theoretical investigations of a modified compressed ultrafast photography method suitable for single-shot fluorescence lifetime imaging
Authors:Li, Yahui (1, 2, 3); Tian, Jinshou (1, 2, 3); Day-Uei Li, David (4)
Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi’an Institute of Optics and Precision Mechanics, Xi’an Shaanxi; 710049, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan Shanxi; 030006, China; (4) Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow; G4 0RE, United Kingdom
Corresponding author:Li, Yahui(yahuili777@hotmail.com)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:5
Issue date:February 10, 2021
Publication year:2021
Pages:1476-1483
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:A single-shot fluorescence lifetime imaging (FLIM) method based on the compressed ultrafast photography (CUP) is proposed, named space-restricted CUP (srCUP). srCUP is suitable for imaging objects moving slowly (<∼ 150/M mm/s, M is the magnification of the objective lens) in the field of view with the intensity changing within nanoseconds in a measurement window around 10 ns. We used synthetic datasets to explore the performances of srCUP compared with CUP and TCUP (a variant of CUP). srCUP not only provides superior reconstruction performances, but its reconstruction speed is also twofold and threefold faster than CUP and TCUP, respectively. The lifetime determination performances were assessed by estimating lifetime components, amplitude- and intensity-weighted average lifetimes (τA and τI), with the reconstructed scenes using the least squares method based on a bi-exponential model. srCUP has the best accuracy and precision for lifetime determinations with a relative bias less than 7% and a coefficient of variation less than 7% for τA, and a relative bias less than 10% and a coefficient of variation less than 11% for τI
© 2021 Optical Society of America
Number of references:51
Main heading:Fluorescence imaging
Controlled terms:Least squares approximations - Photography
Uncontrolled terms:Accuracy and precision - Bi-exponential models - Fluorescence lifetime imaging - Least squares methods - Reconstruction speed - Synthetic datasets - Theoretical investigations - Ultrafast photography
Classification code:746 Imaging Techniques - 921.6 Numerical Methods
Numerical data indexing:Percentage 1.00e+01%, Percentage 1.10e+01%, Percentage 7.00e+00%, Time 1.00e-08s
DOI:10.1364/AO.415594
Funding details: Number: 71705255, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Natural Science Basic Research Plan in Shaanxi Province of China (2019JQ-930); National Natural Science Foundation of China (71705255). We thank Zhenya Zang for his help in estimating the time for code generation with FPGA. We would like to acknowledge the support from the China Scholarship Council.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212710589837
Title:Collective energy-spectrum broadening of a proton beam in a gas-discharge plasma
Authors:Cheng, Rui (1, 6, 7); Hu, Zhang-Hu (2); Hui, De-Xuan (2); Zhao, Yong-Tao (1, 3); Chen, Yan-Hong (1); Gao, Fei (2); Lei, Yu (1); Wang, Yu-Yu (1); Zhu, Bing-Li (4); Yang, Yang (4); Wang, Zhao (1, 5); Zhou, Ze-Xian (1, 5); Wang, You-Nian (2); Yang, Jie (1)
Author affiliation:(1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou; 730000, China; (2) School of Physics, Dalian University of Technology, Dalian; 116024, China; (3) MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'An Jiaotong University, Xi'an; 710049, China; (4) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710049, China; (5) College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou; 730000, China; (6) University of Chinese Academy of Sciences, Beijing; 100049, China; (7) Advanced Energy Science and Technology Guangdong Laboratory, Huizhou; 516003, China
Corresponding author:Hu, Zhang-Hu(zhanghu@dlut.edu.cn)
Source title:Physical Review E
Abbreviated source title:Phys. Rev. E
Volume:103
Issue:6
Issue date:June 2021
Publication year:2021
Article number:063216
Language:English
ISSN:24700045
E-ISSN:24700053
Document type:Journal article (JA)
Publisher:American Physical Society
Abstract:

An accurate understanding of ion-beam transport in plasmas is crucial for applications in inertial fusion energy and high-energy-density physics. We present an experimental measurement on the energy spectrum of a proton beam at 270 keV propagating through a gas-discharge hydrogen plasma. We observe the energies of the beam protons changing as a function of the plasma density and spectrum broadening due to a collective beam-plasma interaction. Supported by linear theory and three-dimensional particle-in-cell simulations, we attribute this energy modulation to a two-stream instability excitation and further saturation by beam ion trapping in the wave. The widths of the energy spectrum from both experiment and simulation agree with the theory.
© 2021 American Physical Society.
Number of references:25
Main heading:Electric discharges
Controlled terms:Beam plasma interactions - Ion beams - Plasma density - Plasma simulation - Proton beams - Spectroscopy
Uncontrolled terms:Energy modulation - Gas-discharge plasmas - High energy density physics - Inertial fusion energy - Ion beam transport - Spectrum broadening - Three dimensional particle-in-cell simulations - Two stream instability
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 932.1 High Energy Physics - 932.3 Plasma Physics
Numerical data indexing:Electron_Volt 2.70e+05eV
DOI:10.1103/PhysRevE.103.063216

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210409829936
Title:Rapid Image Reconstruction of Structured Illumination Microscopy Directly in the Spatial Domain????(Open Access)
Authors:Dan, Dan (1); Wang, Zhaojun (1); Zhou, Xing (1); Lei, Ming (1, 2); Zhao, Tianyu (1); Qian, Jia (1); Yu, Xianghua (1); Yan, Shaohui (1); Min, Junwei (1); Bianco, Piero R. (3); Yao, Baoli (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi an; 710119, China; (2) Xi an Jiaotong University, Xi an; 710049, China; (3) Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha; NE; 68198, United States
Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)
Source title:IEEE Photonics Journal
Abbreviated source title:IEEE Photon. J.
Volume:13
Issue:1
Issue date:February 2021
Publication year:2021
Article number:9329035
Language:English
E-ISSN:19430655
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Super-resolution structured illumination microscopy (SIM) routinely performs image reconstruction in the frequency domain using an approach termed frequency-domain reconstruction (FDR). Due to multiple Fourier transforms between the spatial and frequency domains, SIM suffers from low reconstruction speed, constraining its applications in real-time, dynamic imaging. To overcome this limitation, we developed a new method for SIM image reconstruction, termed spatial domain reconstruction (SDR). SDR is intrinsically simpler than FDR, does not require Fourier transforms and the theory predicts it to be a rapid image reconstruction method. Results show that SDR reconstructs a super-resolution image 7-fold faster than FDR, producing images that are equal to either FDR or the widely-used FairSIM. We provide a proof-of-principle using mobile fluorescent beads to demonstrate the utility of SDR in imaging moving objects. Consequently, replacement of the FDR approach with SDR significantly enhances SIM as the desired method for live-cell, instant super-resolution imaging. This means that SDR-SIM is a 'What You See Is What You Get' approach to super-resolution imaging.
© 2009-2012 IEEE.
Number of references:31
Main heading:Image reconstruction
Controlled terms:Fourier transforms - Frequency domain analysis - Optical resolving power
Uncontrolled terms:Frequency domains - Image reconstruction methods - Proof of principles - Reconstruction speed - Spatial and frequency domain - Structured illumination microscopies (SIM) - Structured illumination microscopy - Super resolution imaging
Classification code:741.1 Light/Optics - 921.3 Mathematical Transformations
DOI:10.1109/JPHOT.2021.3053110
Funding details: Number: GM10056, Acronym: NIH, Sponsor: National Institutes of Health;Number: 11474352,61522511,81427802,91750106, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFC0110100, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Manuscript received December 11, 2020; revised January 13, 2021; accepted January 15, 2021. Date of publication January 20, 2021; date of current version February 8, 2021. This work was supported in part by the Natural Science Foundation of China under Grants 91750106, 81427802, 61522511, and 11474352, and in part by the National Key Research and Development Program of China under Grant 2017YFC0110100, and NIH Grant GM10056 to PRB. Corresponding author: Baoli Yao (e-mail: yaobl@opt.ac.cn).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212410488576
Title:Apparatus for generation of nanojoule-class water-window high-order harmonics????(Open Access)
Authors:Nishimura, Kotaro (1, 2); Fu, Yuxi (1, 3); Suda, Akira (2); Midorikawa, Katsumi (1); Takahashi, Eiji J. (1)
Author affiliation:(1) Extreme Photonics Research Group, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama; 351-0198, Japan; (2) Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda; Chiba; 278-8510, Japan; (3) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, Shaanxi; 710119, China
Corresponding author:Takahashi, Eiji J.(ejtak@riken.jp)
Source title:Review of Scientific Instruments
Abbreviated source title:Rev. Sci. Instrum.
Volume:92
Issue:6
Issue date:June 1, 2021
Publication year:2021
Article number:063001
Language:English
ISSN:00346748
E-ISSN:10897623
CODEN:RSINAK
Document type:Journal article (JA)
Publisher:American Institute of Physics Inc.
Abstract:

In our recent study [Fu et al., Commun. Phys. 3(1), 92 (2020)], we have developed an approach for energy-scaling of high-order harmonic generation in the water-window region under a neutral-medium condition. More specifically, we obtained a nanojoule-class water-window soft x-ray harmonic beam under a phase-matching condition. It has been achieved by combining a newly developed terawatt-class mid-infrared femtosecond laser and a loose-focusing geometry for high-order harmonic generation. The generated beam is more than 100 times intense compared to previously reported results. The experimental setup included two key parts: a terawatt mid-infrared femtosecond driving laser [Fu et al., Sci. Rep. 8(1), 7692 (2018)] and a specially designed gas cell. Despite the dramatic drop in the optimal gas pressure for phase-matching due to loose-focusing geometry, it still reached the 1 bar level for helium. Thus, we have designed a double-structured pulsed-gas cell with a differential pumping system, which enabled providing sufficiently high gas pressure. Moreover, it allowed reducing gas consumption significantly. A robust energy-scalable apparatus for high-order harmonic generation developed in this study will enable the generation of over ten-nanojoule water-window attosecond pulses in the near future.
© 2021 Author(s).
Number of references:61
Main heading:Gases
Controlled terms:Femtosecond lasers - Harmonic analysis - Harmonic generation - Infrared devices - Optical pumping - Phase matching - X rays
Uncontrolled terms:Attosecond pulse - Differential pumping - Energy scaling - Focusing geometry - High gas pressures - High order harmonic generation - High order harmonics - Phase matching conditions
Classification code:713 Electronic Circuits - 921.6 Numerical Methods - 932.1 High Energy Physics
DOI:10.1063/5.0045342
Funding details: Number: 19H0562, Acronym: -, Sponsor: -;Number: S19-020-III, Acronym: -, Sponsor: -;Number: 17H01067,21H01850,JP-MXS0118068681, Acronym: Monbusho, Sponsor: Ministry of Education, Culture, Sports, Science and Technology;Number: 61690222, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021-III, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: RIKEN;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:This work was supported, in part, by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) through Grants-in-Aid under Grant Nos. 17H01067 and 21H01850, in part, by the MEXT Quantum Leap Flagship Program (Q-LEAP) (Grant No. JP-MXS0118068681), in part, by the FY 2019 President discretionary funds of RIKEN, in part, by the Matsuo Foundation 2018, and, in part, by the RIKEN Junior Research Associate Program. K.M. gratefully acknowledges the financial support from Grants-in-Aid for Scientific Research (Grant No. 19H0562). Y.F. gratefully acknowledges the financial support from the Major Science and Technology Infrastructure Pre-research Program of CAS (Grant No. J20-021-III), the Key Deployment Research Program of XIOPM (Grant No. S19-020-III), the Natural Science Basic Research Program of Shaanxi (Grant No. 2019JCW-03), and the National Natural Science Foundation of China (Grant No. 61690222).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20212510518780
Title:Two-dimensional optical gap solitons and vortices in a coherent atomic ensemble loaded on optical lattices
Authors:Chen, Zhiming (1, 2, 3); Zeng, Jianhua (2)
Author affiliation:(1) State Key Laboratory of Nuclear Resources and Environment & School of Science, East China University of Technology, Nanchang; 330013, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (3) Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan; 250358, China
Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)
Source title:Communications in Nonlinear Science and Numerical Simulation
Abbreviated source title:Comm. Nonlinear Sci. Numer. Simul.
Volume:102
Issue date:November 2021
Publication year:2021
Article number:105911
Language:English
ISSN:10075704
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Coherent atomic systems, e.g., resonantly cold atomic gases within which electromagnetically induced transparency (EIT) operates, have recently received great attention, because of their remarkable scientific properties and pivotal implications. Light behavior in such systems governed by various potentials is a new and interesting research focus, but missing literally report on two-dimensional (2D) localized gap modes in coherent atomic systems loaded on optical lattices. We survey such issue in a coherent atomic gas inside where the EIT turns on, trapped by 2D optical lattices—constituted by counter-propagating far-detuned Stark laser fields, in the framework of nonlinear Schrödinger equation derived from Maxwell-Bloch equations. Using the linear stability analysis and direct perturbed evolution we address the formation, property, and stability of 2D localized gap modes of two types, gap solitons and gap vortices, in forbidden band gaps of the underlying linear Bloch-wave spectrum. The former mode is fundamental gap solitons, and the latter belongs to higher-order gap solitons with embedded topological charge. Our results are helpful not only for in-depth understanding of soliton dynamics in coherent atomic ensemble loaded on periodic potentials, but also for laying the groundwork for forthcoming applications in optical communications and quantum information processing.
© 2021 Elsevier B.V.
Number of references:67
Main heading:Optical lattices
Controlled terms:Atoms - Crystal lattices - Energy gap - Linear stability analysis - Maxwell equations - Nonlinear equations - Nonlinear optics - Optical communication - Optical Kerr effect - Optical materials - Quantum optics - Solitons - Transparency - Vortex flow
Uncontrolled terms:Atomic ensemble - Atomic system - Electromagnetically-induced transparency - Gap soliton - Gap vortex - Kerr nonlinearity - Kerrnonlinearities - Optical gap soliton and vortex - Optical- - Two-dimensional
Classification code:631.1 Fluid Flow, General - 701.1 Electricity: Basic Concepts and Phenomena - 701.2 Magnetism: Basic Concepts and Phenomena - 717.1 Optical Communication Systems - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 921.2 Calculus - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics - 933.1.1 Crystal Lattice
DOI:10.1016/j.cnsns.2021.105911
Funding details: Number: 11704066, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 12074063, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 12074423, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by the National Natural Science Foundation of China (Grant Nos. 11704066, 12074423, and 12074063), Jiangxi Provincial Natural Science Foundation (Grant No. 20202BABL211013), Science and Technology Project of Jiangxi Provincial Education Department (Grant Nos. GJJ160576 and GJJ180378), and East China University of Technology Research Foundation for Advanced Talents (Grant No. DHBK2016118).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310131951
Title:Nonlinear calibration of frequency modulated continuous wave LIDAR based on a microresonator soliton comb
Authors:Jia, Linhua (1); Wang, Yang (2, 3); Wang, Xinyu (2, 3); Zhang, Fumin (1); Wang, Weiqiang (2); Wang, Jindong (1); Zheng, Jihui (1); Chen, Jiawei (1); Song, Mingyu (1); Ma, Xin (1); Yuan, Meiyan (2, 3); Little, Brent (2, 3); Chu, Sai Tek (4); Cheng, Dong (2, 3); Qu, Xinghua (1); Zhao, Wei (2, 3); Zhang, Wenfu (2, 3)
Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin; 300072, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Source title:Optics Letters
Abbreviated source title:Opt. Lett.
Volume:46
Issue:5
Issue date:March 1, 2021
Publication year:2021
Pages:1025-1028
Language:English
ISSN:01469592
E-ISSN:15394794
CODEN:OPLEDP
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:Traditional frequency modulated continuous wave (FMCW) LIDAR ranging is based on heterodyne detection, calculating unknown distance by extracting the frequency of the interference signal, while the main error source is frequency modulation (FM) nonlinearity. In this paper, a ranging system based on a microresonator soliton comb is demonstrated to correct the nonlinearity by sampling the ranging signals at equal frequency intervals, producing a ranging error lower than 20 µm, while at the range of 2 m. Advantages of fast data acquisition, light computation requirements, and a simple optical path, without long optical fiber, give this method a high practical value in precision manufacturing.
© 2021 Optical Society of America
Number of references:13
Main heading:Frequency modulation
Controlled terms:Data acquisition - Heterodyne detection - Optical fibers - Optical radar - Resonators - Solitons
Uncontrolled terms:Fast data acquisition - Frequency intervals - Frequency-modulated continuous waves - Interference signal - Main error sources - Micro resonators - Nonlinear calibration - Precision manufacturing
Classification code:723.2 Data Processing and Image Processing - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems
Numerical data indexing:Size 2.00e+00m
DOI:10.1364/OL.415524
Funding details: Number: 2018YFB2003501, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 2018YFF0212702, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 51675380, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 51775379, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61635013, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61705257, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61805277, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 62075238, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (51675380, 51775379, 61635013, 61675231, 61705257, 61805277, 62075238); Key Projects Supported by Science and Technology of Tianjin, China (18YFZCGX00920); Youth Innovation Promotion Association, Chinese Academy of Sciences (2016353); Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Key Research and Development Program of China (2018YFB2003501, 2018YFF0212702).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509874612
Title:Applications and development of micro-or nano-metric multi degree of freedom adjusting displacement scaling mechanisms for primary mirror
Authors:Hu, Bin (1); Li, Chuang (2); Zhu, Qing (1); Ye, Jing (1, 2)
Author affiliation:(1) Xian Institute of Optics and Precision Mechanics, 17 Xinxi Road, Xian, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing; 100049, China
Corresponding author:Hu, Bin(lenovosk@sina.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:117610R
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:For large aperture and high-resolution space optical cameras, the focusing requirements caused by different resolution requirements, or the requirements for the segmented primary mirror for deployable telescopes or on-orbit assembly space telescopes, the micro-or nano-metric multi degree of freedom adjusting of the primary mirror or the segment mirror is one of the inevitable development trends of the active optical system. According to the different degrees of freedom involved in the primary mirror adjustment, the micro-or nano-metric multi degree of freedom adjusting displacement scaling mechanisms of the monolithic and segmented primary mirror are studied. The development history and structural characteristics of multi degree of freedom adjusting displacement scaling mechanisms including rigid lever type, gear deceleration type, hydraulic mechanism type and compliant hinge type, as well as their research status and application fields, are introduced. The performance characteristics and applications of various displacement scaling mechanisms are analyzed and compared. Finally, according to the application requirements of space telescopes in the future, the development trend of multi degree of freedom (DOF) adjusting displacement scaling mechanism for segmented primary mirror is proposed.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:17
Main heading:Degrees of freedom (mechanics)
Controlled terms:Mechanisms - Mirrors - Optical systems - Photonics - Space telescopes
Uncontrolled terms:Application requirements - Deployable telescopes - Development history - Different resolutions - Multi degree-of-freedom - Performance characteristics - Segmented primary mirrors - Structural characteristics
Classification code:601.3 Mechanisms - 741.3 Optical Devices and Systems - 931.1 Mechanics
DOI:10.1117/12.2586744

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609889126
Title:Determination of the photoemission position in single-photon ionization with attosecond streaking spectroscopy
Authors:Wang, Feng (1); Liao, Qing (1); Liu, Kai (1); Qin, Meiyan (1); Zhang, Xiaofan (1); Zhang, Qingbin (2); Cao, Wei (2); Pi, Liang-Wen (3); Zhou, Yueming (2); Lu, Peixiang (4)
Author affiliation:(1) Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan; 430205, China; (2) Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan; 430074, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (4) Guangdong Intelligent Robotics Institute, Dongguan; 523808, China
Source title:Physical Review A
Abbreviated source title:Phys. Rev. A
Volume:103
Issue:1
Issue date:January 2021
Publication year:2021
Article number:A15
Language:English
ISSN:24699926
E-ISSN:24699934
Document type:Journal article (JA)
Publisher:American Physical Society
Abstract:Attosecond metrology can directly measure attosecond emission time of photoexcited electrons from matter, providing unprecedented understanding of transition processes of electrons from bound to continuum states. However, some fundamental details of the electron dynamics in the entire emission process upon photoexcitation still remain debatable or unknown. The photoemission time delays deduced from attosecond streaking spectroscopy originate from photoelectron propagation in the coupled Coulomb-laser fields, encoding the spatial and spectral information of electrons upon photoexcitation. Here we demonstrate that attosecond photoemission delays can be used to image picometer-resolved photoemission position via a classical model. The electronic dynamics in the laser-assisted single-photon ionization process is fully captured by a quantum path-integral model. We trace the imaged photoemission position to the average position of spatially coherent superposition of electron waves upon photoexcitation and, in particular, predict emission position coinciding with the orbital radius of the ground state of hydrogen-like atoms, in contrast with previous predictions.
© 2021 American Physical Society.
Number of references:40
Main heading:Photoionization
Controlled terms:Electrons - Ground state - Particle beams - Photoemission - Photoexcitation - Photons
Uncontrolled terms:Attosecond metrology - Coherent superpositions - Electronic dynamics - Hydrogen-like atoms - Photoexcited electrons - Single photon ionization - Spectral information - Transition process
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 801.4 Physical Chemistry - 802.2 Chemical Reactions - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics
DOI:10.1103/PhysRevA.103.013115
Funding details: Number: T201806, Acronym: -, Sponsor: Hubei Provincial Department of Education;Number: 11627809,11674257,11934006,11947096,12021004, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020CFA082, Acronym: -, Sponsor: Natural Science Foundation of Hubei Province;Number: 2019B030302003, Acronym: -, Sponsor: Applied Basic Research Key Project of Yunnan;
Funding text:This work was supported by the National Natural Science Foundation of China (Grants No. 11934006, No. 11674257, No. 11627809, No. 12021004, and No. 11947096), Hubei Provincial Department of Education (Grant No. T201806), the Natural Science Foundation of Hubei Province (Grant No. 2020CFA082), and the Guangdong Major Project of Basic and Applied Basic Research (Grant No. 2019B030302003).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810608721
Title:Optical ranging system based on multiple pulse train interference using soliton microcomb????(Open Access)
Authors:Zheng, Jihui (1); Wang, Yang (2, 3); Wang, Xinyu (2, 3); Zhang, Fumin (1); Wang, Weiqiang (2); Ma, Xin (1); Wang, Jindong (1); Chen, Jiawei (1); Jia, Linhua (1); Song, Mingyu (1); Yuan, Meiyan (2, 3); Little, Brent (2, 3); Chu, Sai Tek (4); Cheng, Dong (2, 3); Qu, Xinghua (1); Zhao, Wei (2, 3); Zhang, Wenfu (2, 3)
Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin; 300072, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, Hong Kong
Corresponding author:Zhang, Fumin(zhangfumin@tju.edu.cnemailwwq@opt.ac.cnemailwfuzhang@opt.ac.cn)Wang, Weiqiang(wwq@opt.ac.cnemailwfuzhang@opt.ac.cn)Zhang, Wenfu(wfuzhang@opt.ac.cn)
Source title:Applied Physics Letters
Abbreviated source title:Appl Phys Lett
Volume:118
Issue:26
Issue date:June 28, 2021
Publication year:2021
Article number:261106
Language:English
ISSN:00036951
CODEN:APPLAB
Document type:Journal article (JA)
Publisher:American Institute of Physics Inc.
Abstract:

The multiple pulse train interference (MPTI) ranging system takes advantage of the high accuracy and absolute length measurement capability, but traditional scheme has a large measurement dead zone. In this Letter, we propose a MPTI ranging scheme based on chip-based soliton microcomb to achieve high-precision but no dead-zone measurement. The measurement optical path is improved to solve the problem of cross correlation interference fringe overlap, and a peak fitting algorithm is employed to further improve the measurement accuracy of the system. Using a commercial He-Ne interferometer, a 384 nm precision is obtained in 1.5 m distance measurements. Advantages of the simple optical path, high precision, and no measurement dead zone are expected to realize on-chip integration and provide a solution for precision measurement.
© 2021 Author(s).
Number of references:42
Main heading:Optical correlation
Controlled terms:Range finding - Solitons
Uncontrolled terms:Absolute length measurement - Cross correlations - Interference fringe - Measurement accuracy - On-chip integration - Optical ranging - Precision measurement - Ranging systems
Classification code:741.1 Light/Optics
Numerical data indexing:Size 1.50e+00m
DOI:10.1063/5.0054065
Funding details: Number: 18YFZCGX00920, Acronym: -, Sponsor: -;Number: 51675380,51775379,61635013,61675231,61705257,61805277,62075238, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018YFB2003501,2018YFF0212702, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 2016353, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;
Funding text:This work was supported by the National Natural Science Foundation of China (Grant Nos. 51675380, 62075238, 61675231, 51775379, 61635013, 61705257, and 61805277); National Key Research and Development Plan of China (Grant Nos. 2018YFF0212702 and 2018YFB2003501); Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB24030600); Youth Innovation Promotion Association, Chinese Academy of Sciences (Grant No. 2016353); and Key Projects Supported by Science and Technology of Tianjin, China (Grant No. 18YFZCGX00920).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20213010675818
Title:Perfect Soliton Crystals in the High-Q Microrod Resonator
Authors:Niu, Rui (1, 3); Wan, Shuai (1, 3); Wang, Zheng-Yu (1, 3); Li, Jin (1, 3); Wang, Wei-Qiang (2, 4); Zhang, Wen-Fu (2, 4); Guo, Guang-Can (1, 3); Zou, Chang-Ling (1, 3); Dong, Chun-Hua (1, 3)
Author affiliation:(1) Cas Key Laboratory of Quantum Information, University of Science and Technology of China, Anhui, Hefei; 230026, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Cas, Xi'an; 710119, China; (3) Cas Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Anhui, Hefei; 230026, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Dong, Chun-Hua(chunhua@ustc.edu.cn)
Source title:IEEE Photonics Technology Letters
Abbreviated source title:IEEE Photonics Technol Lett
Volume:33
Issue:15
Issue date:August 1, 2021
Publication year:2021
Pages:788-791
Article number:9481249
Language:English
ISSN:10411135
E-ISSN:19410174
CODEN:IPTLEL
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

The coherent temporal soliton in optical microresonators has attracted great attention recently. Here, we have fabricated the microrod resonator with Q factor as high as 2 × 108 and demonstrated the dissipative Kerr soliton generation in such a microresonator, by utilizing an auxiliary-laser-assisted thermal response control. In addition, we have changed the pump laser and observed the perfect soliton crystals. With the simulation, we found that the perfect soliton crystals are generated based on the avoided mode crossing, which is affected by the pump resonance and pump power.
© 1989-2012 IEEE.
Number of references:46
Main heading:Solitons
Controlled terms:Crystals - Pumping (laser) - Q factor measurement - Resonators
Uncontrolled terms:Kerr solitons - Laser-assisted - Micro resonators - Optical microresonators - Pump laser - Pump power - Temporal solitons - Thermal response
Classification code:744.1 Lasers, General - 933.1 Crystalline Solids - 942.2 Electric Variables Measurements
DOI:10.1109/LPT.2021.3096645

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211210107681
Title:Extraordinary Fast Forward and Backward Light in Transparent Non-Hermitian Systems
Authors:Zhang, Lingxuan (1); Ying, Lei (2); Ge, Li (3, 4); Zhao, Wei (1); Zhang, Wenfu (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Interdisciplinary Center for Quantum Information and Department of Physics, Zhejiang University, Hangzhou; 310027, China; (3) Department of Physics and Astronomy, College of Staten Island, CUNY, Staten Island, New York; 10314, United States; (4) The Graduate Center, CUNY, New York; NY; 10016, United States
Corresponding author:Zhang, Wenfu(wfuzhang@opt.ac.cnemailli.ge@csi.cuny.edu)Ge, Li(li.ge@csi.cuny.edu)
Source title:Laser and Photonics Reviews
Abbreviated source title:Laser Photon. Rev.
Volume:15
Issue:5
Issue date:May 2021
Publication year:2021
Article number:2000204
Language:English
ISSN:18638880
E-ISSN:18638899
Document type:Journal article (JA)
Publisher:John Wiley and Sons Inc
Abstract:

The phenomenon of fast forward and backward light pulse propagation in effectively transparent non-Hermitian photonic systems is reported. Specifically, the propagation eigenmodes are analyzed in several parity-time-symmetric coupled waveguides. In contrast to a previous finding that showed slow light due to an exceptional point in such systems, a critical point in its close proximity that displays a diverging dispersion is identified. Superluminal light pulse propagation in the forward and backward directions is then found and observed numerically on the two sides of the critical point, respectively. This abnormal phenomenon can be understood by a conservation relation of group velocities, which can be extended to other transparent non-Hermitian photonic systems with different symmetries. More importantly, the abrupt transition across the critical point between the fast forward and backward light can be tuned, indicating the possibility of detecting atom-scale movement of the waveguides with little time delay. In addition, bandwidth broadening and a passive superluminal propagation configuration are discussed.
© 2021 Wiley-VCH GmbH
Number of references:32
Main heading:Light
Controlled terms:Light transmission - Slow light - Waveguides
Uncontrolled terms:Abnormal phenomenon - Bandwidth broadening - Coupled waveguides - Exceptional points - Forward-and-backward - Light pulse propagation - Superluminal light - Superluminal propagation
Classification code:714.3 Waveguides - 741.1 Light/Optics
DOI:10.1002/lpor.202000204
Funding details: Number: 201903, Acronym: -, Sponsor: -;Number: 2016353,12004421, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2019JQ‐447, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 61675231,61805277,61635013,61705257, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:L.Z. and L.Y. contributed equally to this work. Prof. Wenfu Zhang acknowledges the National Natural Science Foundation of China (Grant Nos. 61635013, 61675231, 61705257, and 61805277) and the Strategic Priority Research Program of the Youth Innovation Promotion Association of CAS (Grant No. 2016353). L.Z. acknowledges the National Natural Science Foundation of China (Grant No. 12004421), the Natural Science Foundation of Shaanxi Province (2019JQ‐447), and the Research Project of Xi'an Postdoctoral Innovation Base (No. 201903).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410162042
Title:Evaluation of compression quality of space-borne interference hyperspectral image
Authors:Zhang, Xiaorong (1); Li, Siyuan (1); Hu, Bingliang (1); Liu, Xuebin (1); Yan, Qiangqiang (1); Li, Yun (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China
Corresponding author:Zhang, Xiaorong(zhangxiaorong@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11763
Part number:1 of 1
Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications
Issue date:2021
Publication year:2021
Article number:117633G
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643611
Document type:Conference article (CA)
Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications
Conference date:November 5, 2020 - November 7, 2020
Conference location:Kunming, China
Conference code:167886
Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory
Publisher:SPIE
Abstract:The data acquired by the space-borne interference hyperspectral imager is a hybrid interferogram cube. For this kind of complicated data, there are many compression schemes for the on-board compression encoder. How to determine the optimal compression scheme and the optimal compression parameters under this compression scheme is crucial to recovering data. This paper proposes three compression schemes for space-borne interference hyperspectral images, which are mixed interferograms, pure interferograms, and fast views, respectively, and performs a compression evaluation. The peak signal-to-noise ratio of the recovered image, minimum quadratic error, and the spectral angle corresponding to the restored spectral curve are used as the measurement indicators to determine the optimal scheme and the optimal compression parameter configuration which are successfully applied to the development of the spectrometer. This paper establishes a scene-rich remote sensing interference hyperspectral image data source, quantitatively evaluates the impact of different compression ratios under different compression schemes, and changes in remote sensing image displacement, guides instrument design and parameter configuration, and lays a good foundation for the data application of space-borne interference hyperspectral images.
© 2021 SPIE
Number of references:14
Main heading:Image compression
Controlled terms:Data compression ratio - Interferometry - Quality control - Remote sensing - Signal to noise ratio - Space optics - Spectroscopy
Uncontrolled terms:Compression quality - Hyperspectral image datas - Hyperspectral imagers - Measurement indicators - Optimal compression - Optimal compression schemes - Peak signal to noise ratio - Remote sensing images
Classification code:656.1 Space Flight - 716.1 Information Theory and Signal Processing - 913.3 Quality Assurance and Control - 941.4 Optical Variables Measurements
DOI:10.1117/12.2586561

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810626511
Title:Progress of research on high energy laser component
Authors:Shen, Zeyi (1); Xin, Wei (1); Song, Yang (1)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China
Corresponding author:Xin, Wei(xinwei@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11849
Part number:1 of 1
Issue title:Fourth International Symposium on High Power Laser Science and Engineering, HPLSE 2021
Issue date:2021
Publication year:2021
Article number:118490W
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510645424
Document type:Conference article (CA)
Conference name:4th International Symposium on High Power Laser Science and Engineering, HPLSE 2021
Conference date:April 12, 2021 - April 26, 2021
Conference location:Suzhou, China
Conference code:169923
Publisher:SPIE
Abstract:

Laser weapon is a complex system, which consists of laser, optical system, ATP (Acuisition Tracking Pointing)system, electronic control system and so on. It needs the close cooperation of structure, optics, electronics and other disciplines. Laser weapon has developed rapidly in recent years, and developed countries have increased investment in experiments. Laser weapon has the advantages of high cost-effectiveness ratio and light speed attack. It has been applied in vehicle, shipboard and airborne, and may develop into space application in the future. In recent years, drones play an increasingly important role in the battlefield. Laser weapon is a powerful weapon to deal with drones. Laser weapons can be classified into chemical lasers, solid-state lasers, free electron lasers and so on. Solid state laser will be an important direction of laser development in the future.
© 2021 SPIE.
Number of references:10
Main heading:Solid state lasers
Controlled terms:Chemical lasers - Cost effectiveness - Drones - Electrons - Free electron lasers - High energy lasers - High power lasers - Investments - Military equipment - Optical systems
Uncontrolled terms:Developed countries - Electronic control systems - High costs - Laser weapons
Classification code:404.1 Military Engineering - 741.3 Optical Devices and Systems - 744 Lasers - 911.2 Industrial Economics
DOI:10.1117/12.2598929

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213310779846
Title:High-stability three-field TV detection system
Title of translation:高稳定性三视场电视探测系统
Authors:Peng, Jian-Wei (1); Ma, Ying-Jun (1); Chen, Wei-Ning (1); Shi, Kui (1); Zhang, Gao-Peng (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Zhang, Gao-Peng(zhanggaopeng@opt.ac.cn)
Source title:Guangxue Jingmi Gongcheng/Optics and Precision Engineering
Abbreviated source title:Guangxue Jingmi Gongcheng
Volume:29
Issue:7
Issue date:July 2021
Publication year:2021
Pages:1559-1566
Language:Chinese
ISSN:1004924X
CODEN:GJGOF4
Document type:Journal article (JA)
Publisher:Chinese Academy of Sciences
Abstract:

To meet the strict requirements of stability and consistency of the optical axis for the current three-field TV detection system with a photoelectric search and tracking device, a three-field TV detection system with a rotary switching mechanism was studied. Through the analysis of the system indicators, an optical system for cut-in and cut-out field of view switching was selected, and the structure of the rotary switching mechanism was presented. Based on this, a precise rotating shafting, position-limit mechanism with a powerful neodymium magnet and a high elastic plunger, and worm drive mechanism with self-locking characteristics were designed. The selection process and results of the limit mechanism and the drive mechanism were given. A method of optical axis consistency adjustment with theodolite and cross-reticle was proposed. With this design and adjustment process, a high-stability three-field TV detection system was realized. The test results show that the stability of the optical axis of the M-FOV is less than 8", and the consistency of the optical axis of the three fields of view is within 1 pixel size, which meets the indicator requirements. The results of laboratory and outdoor experiments show that the imaging quality of each field of view of the system is excellent, and the detection range is long, which can meet the requirements of use.
© 2021, Science Press. All right reserved.
Number of references:12
Main heading:System stability
Controlled terms:Neodymium alloys - Optical systems
Uncontrolled terms:Detection range - Detection system - Fields of views - Optical-axis consistencies - Outdoor experiment - Switching mechanism - System indicators - Tracking devices
Classification code:547.2 Rare Earth Metals - 741.3 Optical Devices and Systems - 961 Systems Science
DOI:10.37188/OPE.20212907.1559

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110707199
Title:Thermochromic Film Based on VO2@SiO2 Core-shell Nanoparticles
Title of translation:基于VO2@SiO2核壳纳米粒子的热致变色薄膜
Authors:Wang, Xin (1); Hu, Wenjie (1); Xu, Yao (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:7
Issue date:July 25, 2021
Publication year:2021
Article number:0731001
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

A thermochromic film was prepared with VO2@SiO2 core-shell nanoparticles to enhance the visible light transmittance and weather resistance of thermochromic film and also decrease the agglomeration of VO2 nanoparticles prepared by thermal decomposition method. VO(OH)2@SiO2 core-shell nanoparticles were prepared by coating SiO2 layer on the surface of VO(OH)2 nanoparticles via the surface electric interaction between nagatively charged VO(OH)2 nanoparticles and positively charged NH2 groups of aminopropyltriethoxylsilane. Then a normal heat treatment of VO(OH)2@SiO2 under Ar atmosphere was utilized to obtain VO2@SiO2 nanoparticles. Subsequently optical film with good thermochromic property was prepared by coating the resin dispersion of VO2@SiO2 on well cleaned glass. The thermochromic property and the weather resistance of thermochromic film were studied. From TEM images, we find that SiO2 shell prevents the agglomeration of VO(OH)2 during heat treatment. Research on the optical properties of the film shows that the SiO2 and air of low refractive index can improve the optical properties of thermochromic films, and when the mass fraction of VO2@SiO2 nanoparticles is 10wt%, the optical performance of the composite film is the best. The protective effect of the SiO2 shell to the VO2 core obviously improves the oxidation resistance and corrosion resistance of VO2 in damp heating and acidic environment, which makes longer life of VO2 thermochromic film.
© 2021, Science Press. All right reserved.
Number of references:25
Main heading:Optical films
Controlled terms:Agglomeration - Coatings - Core shell nanoparticles - Corrosion protection - Film preparation - Heat treatment - Nanocomposite films - Nanoparticles - Oxidation resistance - Refractive index - Shells (structures) - Silica - Silica nanoparticles - Silicon - SiO2 nanoparticles - Vanadium dioxide
Uncontrolled terms:Electric interaction - Low refractive index - Optical performance - Positively charged - Thermal decomposition methods - Thermochromic properties - Visible light transmittances - Weather resistance
Classification code:408.2 Structural Members and Shapes - 537.1 Heat Treatment Processes - 539.1 Metals Corrosion - 539.2 Corrosion Protection - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 712.1 Semiconducting Materials - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 761 Nanotechnology - 802.2 Chemical Reactions - 802.3 Chemical Operations - 813.2 Coating Materials - 933 Solid State Physics
DOI:10.3788/gzxb20215007.0731001
Funding details: Number: u1530148, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (No. u1530148)

 

Database:Compendex
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Accession number:20210209767610
Title:Electromagnetic compatibility design of hyperspectral remote sensing high-speed imaging circuit
Title of translation:高光谱遥感高速成像电路电磁兼容设计
Authors:Liu, Yongzheng (1); Liu, Xuebin (1); Liu, Wenlong (1); Zhang, Xin (1); Chen, Xiaolai (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China
Source title:Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics
Abbreviated source title:Xi Tong Cheng Yu Dian Zi Ji Shu/Syst Eng Electron
Volume:43
Issue:1
Issue date:January 2021
Publication year:2021
Pages:26-32
Language:Chinese
ISSN:1001506X
CODEN:XGYDEM
Document type:Journal article (JA)
Publisher:Chinese Institute of Electronics
Abstract:In the field of hyperspectral remote sensing imaging, the demand of indicators for hyperspectral remote resolution, hyperspectral resolution and large width of imaging loads are improved. To solve the problem that the electromagnetic interference (EMI) of the high-speed electronics of spaceborne hyperspectral imaging is becoming more and more intensive, the target design method to enhance the electromagnetic compatibility (EMC) capability of the spaceborne hyperspectral imager is proposed, and the implementation of the load on a specific series of high resolution hyperspectral imager verified the effectiveness of the targeted design. In order to seek the theoretical methods and technical implementation methods of EMI design for high-speed hyperspectral imagers, the useful explorations is made to provide a useful reference for the design of other spaceborne high-speed imaging loads for remote sensing.
© 2021, Editorial Office of Systems Engineering and Electronics. All right reserved.
Number of references:26
Main heading:Hyperspectral imaging
Controlled terms:Design - Electromagnetic compatibility - Electromagnetic pulse - High speed cameras - Image enhancement - Remote sensing - Spectroscopy - Timing circuits
Uncontrolled terms:High resolution - High speed imaging - High-speed electronics - HyperSpectral - Hyperspectral imagers - Hyperspectral remote sensing - Technical implementation - Theoretical methods
Classification code:701 Electricity and Magnetism - 711.1 Electromagnetic Waves in Different Media - 713.4 Pulse Circuits - 742.2 Photographic Equipment
DOI:10.3969/j.issn.1001-506X.2021.01.04

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710253695
Title:Research on Auto-focusing Method Based on Pulse Coupled Neural Network????(Open Access)
Authors:Chen, Taoyu (1); Wang, Huawei (1); Cao, Jianzhong (1)
Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shanxi; 710119, China
Corresponding author:Wang, Huawei(whw@opt.ac.cn)
Source title:Journal of Physics: Conference Series
Abbreviated source title:J. Phys. Conf. Ser.
Volume:1848
Part number:1 of 1
Issue:1
Issue title:2021 4th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2021
Issue date:April 13, 2021
Publication year:2021
Article number:012158
Language:English
ISSN:17426588
E-ISSN:17426596
Document type:Conference article (CA)
Conference name:2021 4th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2021
Conference date:January 29, 2021 - January 31, 2021
Conference location:Sanya, Virtual, China
Conference code:168420
Publisher:IOP Publishing Ltd
Abstract:

The key to automatic focusing method based on image processing is to construct a fast and accurate focus quality evaluation function. The method in this article introduces Pulse Coupled Neural Network processing. Using the characteristics of the network, through the enhanced image, the grayscale sum can be conveniently used to characterize clarity, thereby simplifying calculations and enhancing the real-time performance of focus control.
© Published under licence by IOP Publishing Ltd.
Number of references:8
Main heading:Neural networks
Controlled terms:Image enhancement - Quality control
Uncontrolled terms:Auto-focusing - Automatic focusing - Focus control - Gray scale - Pulse coupled neural network - Quality evaluation - Real time performance
Classification code:913.3 Quality Assurance and Control
DOI:10.1088/1742-6596/1848/1/012158

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212010346833
Title:Analysis of a wavelength-tunable D-shaped photonic crystal fiber filter with broad bandwidth
Authors:Meng, Xiaojian (1); Li, Jianshe (1, 2, 3); Guo, Ying (1); Du, Huijing (1); Liu, Yundong (1); Li, Shuguang (1); Guo, Haitao (2); Bi, Weihong (3)
Author affiliation:(1) State Key Laboratory of Metastable Materials Science & Technology, Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao; 066004, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (3) Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, School of Information Science and Engineering, Yanshan University, Qinhuangdao; 066004, China
Corresponding author:Li, Jianshe(jianshelee@ysu.edu.cn)
Source title:Journal of the Optical Society of America B: Optical Physics
Abbreviated source title:J Opt Soc Am B
Volume:38
Issue:5
Issue date:May 2021
Publication year:2021
Pages:1525-1531
Language:English
ISSN:07403224
E-ISSN:15208540
CODEN:JOBPDE
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

This paper has designed a D-shaped photonic crystal fiber filter based on surface plasmon resonance. The singlepolarization filtering performance is analyzed systematically by the finite element method. It is found that the structural optimization process will modify the refractive index of the fundamental mode and the surface plasmon polarization mode, which results in a shift of the resonance wavelength. The proposed filter is able to indicate the wavelength-tunable function in the ranges of 1250-1350 nm and 1550-1750 nm by two methods.Moreover, at the communication windows of 1310 nm and 1550 nm, the corresponding filtering bandwidths are 170 and 550 nm, respectively. The flow chart of filter preparation reported in the study is promising for use in the field of optical devices.
© 2021 Optical Society of America.
Number of references:26
Main heading:Crystal filters
Controlled terms:Air filters - Bandwidth - Crystal whiskers - Photonic crystal fibers - Plasmons - Refractive index - Structural optimization - Surface plasmon resonance
Uncontrolled terms:1550 nm - Broad bandwidths - Filtering performance - Fundamental modes - Resonance wavelengths - Surface plasmon polarizations - Wavelength tunable
Classification code:451.2 Air Pollution Control - 703.2 Electric Filters - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 921.5 Optimization Techniques - 931.3 Atomic and Molecular Physics - 933.1.1 Crystal Lattice - 951 Materials Science
Numerical data indexing:Size 1.25e-06m to 1.35e-06m, Size 1.31e-06m, Size 1.55e-06m, Size 1.55e-06m to 1.75e-06m, Size 1.70e-07m, Size 5.50e-07m
DOI:10.1364/JOSAB.421792
Funding details: Number: 12074331, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 2019YFB2204001, Acronym: -, Sponsor: National Key Research and Development Program of China;
Funding text:Open Research Fund of State Key Laboratory of TransientOptics and Photonics (SKLST201908); Postdoctoral Preferred Funding Research Project of Hebei Province (B2018003008); Program of the Natural Science Foundation of Hebei Province (F2020203050); National Natural Science Foundation of China (12074331); National Key Research and Development Program of China (2019YFB2204001).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213510833159
Title:Optical coherence tomography-surveilled laser ablation using multifunctional catheter and 355-nm optical pulses
Authors:Kang, Jiqiang (1); Zhu, Rui (2, 3); Li, Jianan (3, 4); Liu, Haiping (3); Ma, Xiuquan (5); Tao, Ling (6); Sun, Yunxu (1)
Author affiliation:(1) School of Electronic and Information Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen; 518055, China; (2) International Graduate School at Shenzhen, Tsinghua University, Shenzhen; 518055, China; (3) Shenzhen Vivolight Medical Device & Technology Co., Ltd., Shenzhen; 518055, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (5) School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Hubei; Wuhan; 430074, China; (6) Department of Cardiology, Xijing Hospital, Fourth Military Medical University, No. 15 Changle West Road, Xi'an; Shaanxi; 710032, China
Corresponding author:Sun, Yunxu(sunyunxu@hit.edu.cn)
Source title:Optics Communications
Abbreviated source title:Opt Commun
Volume:501
Issue date:December 15, 2021
Publication year:2021
Article number:127364
Language:English
ISSN:00304018
CODEN:OPCOB8
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

An optical coherence tomography (OCT)-monitored laser ablation system is presented in this study. The laser ablation subsystem is constructed using the third harmonic output of a Nd:YAG laser source operating at a 355-nm optical wavelength with a single pulse energy greater than 160 mJ and a 1–10 Hz tunable repetition rate. The imaging subsystem is a typical M-mode swept-source OCT system. Moreover, a type of all-fiber multifunctional integrated catheter is demonstrated. The ablation catheter consists of a fiber bundle including 41 multi-mode fibers with an outer diameter of 0.9 mm. A forward-viewing OCT imaging probe is inserted into the ablation catheter for M-mode imaging. The performance of the system is demonstrated by OCT surveillance of the laser ablation process using expanded polystyrene foam as the sample. The OCT system can be used to record the ablation process and simultaneously count the laser ablation duration. This study proposes an effective potential technique to surveil material laser ablation processes, especially in situations where bulky optics are prohibited and all-fiber devices are required.
© 2021 Elsevier B.V.
Number of references:50
Main heading:Laser ablation
Controlled terms:Catheters - Neodymium lasers - Optical tomography - Photonics - Pulse repetition rate - Yttrium aluminum garnet
Uncontrolled terms:Ablation catheters - Coherence tomography - Harmonic outputs - Laser ablation systems - Laser sources - Lasers ablations - Nd:YAG laser - Optical- - Third harmonic - Tomography system
Classification code:462.1 Biomedical Equipment, General - 641.2 Heat Transfer - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.4 Solid State Lasers - 744.8 Laser Beam Interactions - 804.2 Inorganic Compounds
Numerical data indexing:Energy 1.60E-01J, Frequency 1.00E+01Hz, Size 3.55E-07m, Size 9.00E-04m
DOI:10.1016/j.optcom.2021.127364
Funding details: Number: 81927805, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20190806142610885, Acronym: -, Sponsor: Shenzhen Fundamental Research Program;
Funding text:This work was partially supported by grants from the National Natural Science Foundation of China (Grant No. 81927805), the Shenzhen Municipal Science and Technology Plan Project, China (Grant No. JCYJ20160427183803458), and the Shenzhen Fundamental Research Program, China (Grant No. JCYJ20190806142610885).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213510845105
Title:Research on the properties of HfO2optical films prepared with APS assisted electron beam evaporation deposition
Authors:Pan, Yong-Gang (1); Liu, Zheng (1); Li, Mian (1); Liu, Wen-Cheng (1); Bai, Long (1); Zhang, Si-Bao (1); Luo, Chang-Xin (1); Zhang, Chun-Juan (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi; 710119, China
Corresponding author:Pan, Yong-gang(pyg_optics@163.com)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11912
Part number:1 of 1
Issue title:Pacific Rim Laser Damage 2021: Optical Materials for High-Power Lasers
Issue date:2021
Publication year:2021
Article number:1191207
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510646834
Document type:Conference article (CA)
Conference name:Pacific Rim Laser Damage 2021: Optical Materials for High-Power Lasers
Conference date:May 23, 2021 - May 25, 2021
Conference location:Hangzhou, China
Conference code:171344
Sponsor:Chinese Laser Press; Hangzhou Institute for Advanced Study
Publisher:SPIE
Abstract:

HfO2 thin films are widely used in laser system because of its superior optical and mechanical properties, especially high laser induced damage threshold. In this paper, single-layer HfO2 thin films were prepared by APS plasma assisted electron beam evaporation deposition. The effects of oxygen charging of electron gun, baking temperature, discharge current of APS source and bias voltage of APS source on optical properties, surface roughness, standing wave electric filed and laser induced damage threshold of HfO2 thin films were studied by orthogonal experiment. Experiment and analysis results showed that the characteristics of HfO2 thin films are closely related to the oxygen charging of electron gun, baking temperature and APS assisted processing parameters. Especially, baking temperature, oxygen charging of electron gun and bias voltage of APS source have great influence on laser induced damage threshold. Through the analysis of experimental date, the optimal combination of process parameters for APS assisted electron beam evaporation of HfO2 optical films were obtained.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:13
Main heading:Laser damage
Controlled terms:Bakeries - Bias voltage - Electric discharges - Electron beams - Electron guns - Electrons - Evaporation - Film preparation - Hafnium oxides - High power lasers - Optical films - Optical properties - Oxygen - Physical vapor deposition - Surface roughness - Thin films
Uncontrolled terms:Assisted processing - Electron beam evaporation - Electron beam evaporation depositions - Experiment and analysis - Laser induced damage thresholds - Optical and mechanical properties - Optimal combination - Orthogonal experiment
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 713 Electronic Circuits - 714.1 Electron Tubes - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.8 Laser Beam Interactions - 802.3 Chemical Operations - 804 Chemical Products Generally - 822.1 Food Products Plants and Equipment - 931.2 Physical Properties of Gases, Liquids and Solids
DOI:10.1117/12.2602069

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810609192
Title:Dual Mode High Speed Uncooled Short Wave Infrared Camera Based on FPGA????(Open Access)
Authors:Liu, Qing (1); Wang, Huawei (1); Bian, He (1); Wang, Hua (1)
Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China
Corresponding author:Liu, Qing(optliuqing@opt.ac.cn)
Source title:Journal of Physics: Conference Series
Abbreviated source title:J. Phys. Conf. Ser.
Volume:1952
Part number:3 of 4
Issue:3
Issue title:2021 Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021 - 2. Electronics and Electrical Engineering
Issue date:June 29, 2021
Publication year:2021
Article number:032042
Language:English
ISSN:17426588
E-ISSN:17426596
Document type:Conference article (CA)
Conference name:2021 Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021
Conference date:April 14, 2021 - April 16, 2021
Conference location:Dalian, Virtual, China
Conference code:169882
Publisher:IOP Publishing Ltd
Abstract:

This paper introduces a short-wave infrared camera logic design based on FPGA. The hardware design adopts the architecture of Sofradir Tecless SWIR detector SW640+Xilinx FPGA xc4vsx55, which has a dual working mode of 640 512 at 25 FPS and 64 48 at 4000 FPS. The function of high precision target tracking can be realized by high frequency capture of laser signal. In this design, the non-uniform correction coefficient table in SDRAM cache Flash is controlled by FPGA to correct the image of full resolution mode, and the table of 64 48 is cached by Bram in FPGA to achieve fast image correction and processing. The exposure time is controlled by the external synchronous signal, and the 14 bit precision image data are collected by four ADCs for restoration. The output data is processed by image bad point correction, non-uniform correction, median filtering, histogram equalization, and then the image is packaged and sent by the specified protocol.
© Published under licence by IOP Publishing Ltd.
Number of references:4
Main heading:Image processing
Controlled terms:Field programmable gate arrays (FPGA) - Infrared devices - Infrared radiation - Integrated circuit design - Median filters - Target tracking - Temperature indicating cameras
Uncontrolled terms:Correction coefficients - Full resolution modes - High frequency HF - Histogram equalizations - Image correction - Median filtering - Short wave infrared - Synchronous signals
Classification code:703.2 Electric Filters - 714.2 Semiconductor Devices and Integrated Circuits - 721.2 Logic Elements - 741.1 Light/Optics - 742.2 Photographic Equipment
DOI:10.1088/1742-6596/1952/3/032042

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20210509855597
Title:Laser-induced fluorescence and its effect on the damage resistance of fluoride-containing phosphate-based glasses
Authors:Li, Shengwu (1, 2); Yang, Yanqiang (3); Song, Yunfei (3); Wan, Rui (1, 2); Ma, Yuan (1, 2); Peng, Bo (1, 2); Zhang, Guangwei (4); Wang, Pengfei (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang; 621900, China; (4) Zhejiang Fountain Aptitude Technology Inc., Hangzhou; 310051, China
Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)
Source title:Ceramics International
Abbreviated source title:Ceram Int
Volume:47
Issue:9
Issue date:May 1, 2021
Publication year:2021
Pages:13164-13172
Language:English
ISSN:02728842
CODEN:CINNDH
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:A series of multi-component fluoride-containing phosphate-based glasses prepared in a reducing atmosphere showed improved resistance to high-energy ultraviolet (UV) laser-induced damage and strong laser-induced fluorescence (LIF) within the glass bulk. The UV optical absorption, photoluminescence, and fluorescence decay properties of these glasses were investigated to explore the defect-related LIF mechanism and its underlying effect on the glasses’ laser-induced damage threshold (LIDT). Seven laser wavelengths ranging from 253 nm to 532 nm were used to excite the LIF, and two characteristic fluorescence bands peaking at approximately 414 nm and 780–800 nm occurred in all three types of glasses. The LIF band at 414 nm was attributed to PO3-EC defects in the second harmonic frequency (2ω) absorptive glass and third harmonic frequency (3ω) transparent glass, but Fe2+ ions in the fundamental frequency (1ω) absorptive glass. A later fluorescence band at 780–800 nm occurred due to POHC defects in the 2ω absorptive and 3ω transparent glasses and Fe3+ ions in the 1ω absorptive glass. A detailed study on the dynamic decay processes of two additional dominant fluorescence peaks at 450 nm and 780 nm under 266 nm excitation revealed the potential effect of LIF on LIDT improvement. The relatively longer LIF lifetime, higher LIF intensity, and larger LIF peak area corresponded with and contributed to a higher LIDT, especially in the 3ω transparent glass with a low UV absorption coefficient. This study provides strong evidence for the prior hypothesis between strong LIF and LIDT.
© 2021 Elsevier Ltd and Techna Group S.r.l.
Number of references:49
Main heading:Laser damage
Controlled terms:Defects - Fluorescence - Fluorine compounds - Glass - Laser optics - Laser produced plasmas - Light absorption - Ultraviolet lasers
Uncontrolled terms:Characteristic fluorescence - Fluorescence decays - Fundamental frequencies - Laser induced damage thresholds - Laser induced fluorescence - Phosphate based glass - Reducing atmosphere - Third-harmonic frequencies
Classification code:741.1 Light/Optics - 744 Lasers - 812.3 Glass - 951 Materials Science
Numerical data indexing:Size 2.53e-07m to 5.32e-07m, Size 2.66e-07m, Size 4.14e-07m, Size 4.50e-07m, Size 7.80e-07m
DOI:10.1016/j.ceramint.2021.01.181
Funding details: Number: 2017446, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 61307046, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61775235, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2016A08, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:This work is financially supported by the National Natural Science Foundation of China (NSFC No. 61775235, 61307046), West Young Scholars Program of the Chinese Academy of Sciences (XAB2016A08), and Youth Innovation Promotion Association, CAS (2017446).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110716142
Title:In situ SERS detection of quinolone antibiotic residues in a water environment based on optofluidic in-fiber integrated Ag nanoparticles
Authors:Teng, Pingping (1); Gao, Danheng (1); Yang, Xinghua (1); Luo, Meng (1); Kong, Depeng (2); Gao, Shuai (1); Liu, Zhihai (1); Li, Zhanao (1); Wen, Xingyue (1); Yuan, Libo (1, 3); Li, Kang (4); Bowkett, Mark (4); Copner, Nigel (4)
Author affiliation:(1) Key Lab of In-Fiber Integrated Optics, College of Science, Harbin Engineering University, Harbin; 150001, China; (2) State Key Lab of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) Photonics Research Center, Guilin University of Electronics Technology, Guilin; 541004, China; (4) Wireless & Optoelectronics Research & Innovation Centre, Faculty of Computing, Engineering & Science, University of South Wales, Wales; CF37 1DL, United Kingdom
Corresponding author:Yang, Xinghua(yangxh@hrbeu.edu.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:22
Issue date:August 1, 2021
Publication year:2021
Pages:6659-6664
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

In this paper, we present a microstructured optofluidic in-fiber Raman sensor for the detection of quinolone antibiotic residue in a water environment based on Ag surface-enhanced Raman scattering (SERS) substrate grown on the surface of the suspended core of micro-hollow optical fiber (MHF). Here, MHF has a special structure with a suspended core and a microchannel inside, which can become a natural in-fiber optofluidic device. Meanwhile, the self-assembled Ag SERS substrate can be grown on the suspended core’s surface through chemical bonds, forming a microstructured optofluidic device with a Raman enhancement effect. Therefore, it can effectively detect the Raman signal of unlabeled trace quinolone antibiotic residue (ciprofloxacin and norfloxacin) inside the optical fiber. The results show that the ciprofloxacin and norfloxacin detection limits (LOD) are 10−10 M and 10−11 M, respectively. Compared with the maximum residue limit (3.01 × 10−7 mol/L) stipulated by the European Union, the results are much lower, and an ideal quantitative relationship can be obtained within the detection range. Significantly, this study provides an in-fiber microstructured optofluidic Raman sensor for the label-free detection of quinolone antibiotic residue, which will have good development prospects in the field of antibiotic water pollution environmental detection.
© 2021 Optical Society of America
Number of references:22
Main heading:Antibiotics
Controlled terms:Bond strength (chemical) - Fiber optic components - Fiber optic sensors - Microstructure - Optical fibers - Raman scattering - Raman spectroscopy - Silver nanoparticles - Substrates - Surface scattering - Water pollution
Uncontrolled terms:Development prospects - Environmental detection - Label-free detection - Maximum residue limits - Optofluidic devices - Quinolone antibiotics - Surface enhanced Raman Scattering (SERS) - Water environments
Classification code:453 Water Pollution - 461.6 Medicine and Pharmacology - 741.1 Light/Optics - 741.1.2 Fiber Optics - 801.4 Physical Chemistry - 931 Classical Physics; Quantum Theory; Relativity - 951 Materials Science
DOI:10.1364/AO.426611

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211610236399
Title:Non-interferometric accurate phase imaging via linear-convergence iterative optimization????(Open Access)
Authors:Huang, Jianhui (1, 2); Pan, An (3); Jin, Huiliang (1); Meng, Guoxiang (1); Ye, Qian (1, 4)
Author affiliation:(1) School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China; (2) Optics Laboratory, Georgia Institute of Technology, School of Electrical and Computer Engineering, 777 Atlantic Drive N.W., Atlanta; GA; 30332-0250, United States; (3) Pioneering Interdiscipline Center (PIC), State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) Laboratory of Radio Astronomy, Shanghai Observatory, Chinese Academy of Sciences, Shanghai; 200030, China
Corresponding author:Ye, Qian(yeqian@sjtu.edu.cn)
Source title:Optics and Lasers in Engineering
Abbreviated source title:Opt Lasers Eng
Volume:144
Issue date:September 2021
Publication year:2021
Article number:106630
Language:English
ISSN:01438166
CODEN:OLENDN
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

This paper reported a general non-interferometric high-accuracy quantitative phase imaging (QPI) method for arbitrary complex-valued objects. Given by a typical 4-f optical configuration as the imaging system, three frames of small-window phase modulation are applied on the object's Fourier spectrum so that redistributed intensity patterns are produced on the image plane, in which the object phase emerges at different degree. Then, an algebraic relationship that connects the object phase with the output intensity is established to provide us with an approximate closed-form phase recovery. Further, an efficient iterative optimization strategy is developed to turn that approximate solution into an accurate one. Due to the linear convergence property of the iteration, a high-accuracy phase recovery is achieved without requiring heavy iterations. The feasibility and accuracy of the proposed method are verified by both numerical simulations and experiments on diverse phase objects including biomedical tissues.
© 2021
Number of references:42
Main heading:Phase modulation
Controlled terms:Holography - Interferometry - Iterative methods - Numerical methods - Phase measurement
Uncontrolled terms:High-accuracy - Imaging method - In-line holography - Interferometrics - Iterative Optimization - Linear convergence - Phase imaging - Phase recovery - Phase retrieval - Quantitative phase imaging
Classification code:743 Holography - 746 Imaging Techniques - 921.6 Numerical Methods - 941.4 Optical Variables Measurements - 942.2 Electric Variables Measurements
DOI:10.1016/j.optlaseng.2021.106630
Funding details: Number: U1931137, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;
Funding text:National Science Foundation of China ( NSFC ), U1931137 ; China Scholarship Council (CSC) during the visit of Jianhui Huang to Georgia Tech is also acknowledged.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20212510523132
Title:Aerial Infrared Object Tracking via an improved Long-term Correlation Filter with optical flow estimation and SURF matching
Authors:Wang, Xiaotian (1); Zhang, Kai (1); Zhang, Ximing (2); Li, Shaoyi (1); Yan, Jie (1)
Author affiliation:(1) School of Astronautics, Northwestern Polytechnical University, Xi'an; 710072, China; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China
Corresponding author:Zhang, Kai(singlechip@163.com)
Source title:Infrared Physics and Technology
Abbreviated source title:Infrared Phys Technol
Volume:116
Issue date:August 2021
Publication year:2021
Article number:103790
Language:English
ISSN:13504495
CODEN:IPTEEY
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

At present, there are many excellent algorithms in the field of visual object tracking. The correlation filter algorithms are more suitable for infrared object tracking, for the tracking performance is the best. Especially, the long-term correlation tracking has received much attention, owing to its ability to handle the problems of universal tracking (e.g., slight deformation, small-displacement motion, partial occlusion and out of view). However, there are three imperfections such that it fails to solve the problem of rapid motion, it cannot cope with the problem of boundary effect perfectly, and it has poor tracking effect in the case of severe occlusion and severe deformation. Aiming at the problem of rapid motion, the FlowNet 2.0 is introduced to accomplish optical flow estimation, offering motion information and predicting trajectory change process. Aiming to address the concern of boundary effect perfectly, the adjustable Gaussian window is effective to separate the object and the background, improving classifier discrimination. Aiming at the issue of poor tracking effect in the case of severe occlusion and severe deformation, the SURF feature-based matching method is effective to accurately track object and improve the infrared object tracking performance. In addition, the ratio between average peak-to-correlation energy (APCE) and its historical average, as a further complement of maximum response, is introduced to achieve the online updating mechanism, jointly determining whether the tracker needs to be updated, the SURF matching needs to be carried out or the tracker needs to be initialized by re-detector. Our algorithm is validated on synthetic infrared aerial object image sequences, real infrared thermal aerial object image sequences and a public database named AMCOM FLIR respectively. The extensive experimental testify that our improved approach achieves an optimal effect for aerial infrared object tracking in terms of precision plot, success plot and speed.
© 2021
Number of references:41
Main heading:Optical flows
Controlled terms:Antennas - Deformation - Image enhancement - Object tracking - Optical correlation
Uncontrolled terms:Average peak-to-correlation energy criteria - Boundary effects - Correlation filters - Infrared aerial object tracking - Infrared object tracking - Long-term correlations - Matchings - Optical flow estimation - Rapid motions - Tracking performance
Classification code:723.2 Data Processing and Image Processing - 741.1 Light/Optics
DOI:10.1016/j.infrared.2021.103790

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910318664
Title:Diode-pumped SESAM mode-locked low-repetition-rate Tm:CALGO picosecond laser at 1968 nm
Authors:Guo, Lei (1, 2, 3); Yang, Yaling (1, 2, 3); Zhao, Shengzhi (3); Li, Tao (3); Qiao, Wenchao (3, 4); Wang, Ruihua (2); Zhang, Baitao (2, 6); Yang, Kejian (2, 4, 5, 6); He, Jingliang (2, 6); Li, Xun (7)
Author affiliation:(1) School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan; 232001, China; (2) Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, Jinan; 250100, China; (3) School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao; 266237, China; (4) Shenzhen Research Institute of Shandong University, Shenzhen; 518057, China; (5) State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan; 030006, China; (6) Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan; 250358, China; (7) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China
Corresponding author:Yang, Kejian(k.j.yang@sdu.edu.cn)
Source title:Optics and Laser Technology
Abbreviated source title:Opt Laser Technol
Volume:142
Issue date:October 2021
Publication year:2021
Article number:107195
Language:English
ISSN:00303992
CODEN:OLTCAS
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

A diode-pumped SESAM continuous-wave mode-locked (CWML) Tm:CALGO laser is demonstrated at a new center wavelength of 1968 nm based on a ultra-long Z-shaped folding cavity configuration. A total maximum dual-output power of 328 mW is achieved with a pulse duration of 33.2 ps at a repetition rate of 38.86 MHz, corresponding to a maximum single pulse energy of 4.2 nJ.
© 2021 Elsevier Ltd
Number of references:17
Main heading:Pulse repetition rate
Controlled terms:Mode-locked fiber lasers - Pumping (laser)
Uncontrolled terms:Center-wavelength - Continuous wave modes - Diode-pumped - Foldings - Low repetition rate - Mode-locked - Picosecond laser - SESAM - Tm:CALGO - Ultra longs
Classification code:744.1 Lasers, General
Numerical data indexing:Energy 4.20E-09J, Frequency 3.886E+07Hz, Power 3.28E-01W, Size 1.968E-06m, Time 3.32E-11s
DOI:10.1016/j.optlastec.2021.107195
Funding details: Number: S2019-YF-ZDCXL-ZDLGY-0253, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;Number: 2017YFB0405204, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: KF201908, Acronym: -, Sponsor: -;Number: 61775119, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017CXCC0808, Acronym: -, Sponsor: Key Technology Research and Development Program of Shandong;Number: JCYJ 20180305163932273, Acronym: -, Sponsor: -;Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was partially supported by Scientific Research Foundation of Anhui University of Science and Technology, National Key Research and Development Program of China (2017YFB0405204), National Natural Science Foundation of China (NSFC) (No.61775119), Key research and development program of Shandong Province (2017CXCC0808), Shenzhen Science and Technology Research and Development Funds (JCYJ 20180305163932273), the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (KF201908), and Key Research and Development Program of Shaanxi Province (S2019-YF-ZDCXL-ZDLGY-0253).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110717603
Title:Two-center interference and stereo Wigner time delay in photoionization of asymmetric molecules
Authors:Liao, Yijie (1); Zhou, Yueming (1); Pi, Liang-Wen (2, 3); Ke, Qinghua (1); Liang, Jintai (1); Zhao, Yong (1); Li, Min (1); Lu, Peixiang (1, 4, 5)
Author affiliation:(1) School of Physics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Science, Beijing; 100049, China; (4) Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan; 430205, China; (5) CAS Center for Excellence in Ultra-intense Laser Science, Shanghai; 201800, China
Source title:Physical Review A
Abbreviated source title:Phys. Rev. A
Volume:104
Issue:1
Issue date:July 2021
Publication year:2021
Article number:013110
Language:English
ISSN:24699926
E-ISSN:24699934
Document type:Journal article (JA)
Publisher:American Physical Society
Abstract:

We present numerical simulations of the time delay in photoemission of asymmetric diatomic molecules using the technique of reconstruction of attosecond beating by interference of two-photon transitions (RABITT) by solving the time-dependent Schrödinger equation. Our results show an obvious time delay between photoelectrons emitted to the left and right and this relative time delay oscillates as the photoelectron energy changes. More interestingly, the amplitude of this oscillation increases when the asymmetry degree of diatomic molecules decreases. With the method of the selected continuum wave functions, we calculate the Wigner time delay in photoionization. The obtained stereo Wigner time delay also oscillates with photoelectron energy. This oscillation is traced back to two-center interferences and it could explain the relative time delay in the RABITT measurement. Furthermore, our results indicate that the continuum-continuum time delay in photoemission of heteronuclear molecules is asymmetric.
© 2021 American Physical Society
Number of references:64
Main heading:Time delay
Controlled terms:Molecules - Photoelectrons - Photoemission - Photoionization - Photons - Timing circuits - Wave functions
Uncontrolled terms:Asymmetric molecules - Diatomic molecules - Dinger equation - Heteronuclear molecules - Photoelectron energy - Relative time delays - Two-center interference - Two-photon transitions
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 713 Electronic Circuits - 713.4 Pulse Circuits - 802.2 Chemical Reactions - 921 Mathematics - 931.3 Atomic and Molecular Physics
DOI:10.1103/PhysRevA.104.013110
Funding details: Number: 11874163, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 2019YFA0308300, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: J19-121-III, Acronym: -, Sponsor: Chinese Academy of Sciences;
Funding text:National Basic Research Program of China (973 Program) National Natural Science Foundation of China Chinese Academy of Sciences

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20203809183985
Title:Study on the performance of polarization maintaining fiber temperature sensor based on tilted fiber grating
Authors:Zhao, Jun (1, 3); Wang, Hushan (2); Sun, Xiaohan (1)
Author affiliation:(1) School of Electronic Science and Engineering, Southeast University, Nanjing; 210096, China; (2) Xian Institute of Optics and Precision Mechanics of CAS, Xian; 710119, China; (3) Nanjing Sunlight Information Technology Co., Ltd., Nanjing; 210012, China
Corresponding author:Zhao, Jun(103200021@seu.edu.cn)
Source title:Measurement: Journal of the International Measurement Confederation
Abbreviated source title:Meas J Int Meas Confed
Volume:168
Issue date:15 January 2021
Publication year:2021
Article number:108421
Language:English
ISSN:02632241
CODEN:MSRMDA
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:A novel functional-type high integration polarization interference fiber temperature sensor based on 45° tilted fiber Bragg grating in-fiber polarizer (TFBG-PIF-TS) is proposed. The accuracy, resolution, stability, linearity and sensitivity of the prototype are tested and compared with PT100, 18B20 as well as polarizing plate based polarization interferometric fiber temperature sensor (PP-PIF-TS). The feasibility of the scheme in the transformer winding temperature monitoring is verified. The results show that the accuracy and resolution of TFBG-PIF-TS reach ±0.1 °C and 0.01 °C respectively, which has higher resolution, better integration and reliability, and has simple structure, strong anti-vibration and anti-electromagnetic interference abilities. Therefore, the proposed scheme can meet the needs of high voltage, strong magnetic field and other passive precise temperature measurement occasions.
© 2020 Elsevier Ltd
Number of references:24
Main heading:Temperature sensors
Controlled terms:Electromagnetic pulse - Fiber Bragg gratings - Fibers - Optical fiber fabrication - Polarization - Polarization-maintaining fiber - Temperature measurement - Transformer windings
Uncontrolled terms:Fiber temperature sensors - Higher resolution - Polarization interferences - Simple structures - Strong magnetic fields - Temperature monitoring - Tilted fiber Bragg grating - Tilted fiber gratings
Classification code:701 Electricity and Magnetism - 704.1 Electric Components - 741.1.2 Fiber Optics - 944.5 Temperature Measuring Instruments - 944.6 Temperature Measurements
Numerical data indexing:Temperature 2.73e+02K
DOI:10.1016/j.measurement.2020.108421

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510529574
Title:Comprehensive risk assessment of transmission lines affected by multi-meteorological disasters based on fuzzy analytic hierarchy process
Authors:Han, Binbin (1); Ming, Zhengfeng (1); Zhao, Yuhu (1); Wen, Tao (1); Xie, Meilin (2)
Author affiliation:(1) School of Mechanic-Electronic Engineering, Xidian University, Xi'an; 710071, China; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China
Corresponding author:Ming, Zhengfeng(zfming@xidian.edu.cn)
Source title:International Journal of Electrical Power and Energy Systems
Abbreviated source title:Int J Electr Power Energy Syst
Volume:133
Issue date:December 2021
Publication year:2021
Article number:107190
Language:English
ISSN:01420615
CODEN:IEPSDC
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Number of references:43
DOI:10.1016/j.ijepes.2021.107190

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110715981
Title:Optical path pointing error and coaxiality analysis of APT system of space laser communication terminal
Authors:Furui, Zhang (1); Ping, Ruan (2); Junfeng, Han (2)
Author affiliation:(1) College of Optoelectronic Engineering, Xi'an Technological University, Xi'an; 710021, China; (2) Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China
Corresponding author:Furui, Zhang(jiffring@126.com)
Source title:Optica Applicata
Abbreviated source title:Opt Appl
Volume:51
Issue:2
Issue date:2021
Publication year:2021
Pages:203-222
Language:English
ISSN:00785466
E-ISSN:18997015
CODEN:OPAPBZ
Document type:Journal article (JA)
Publisher:Wroc&lstrok;aw University of Science and Technology
Abstract:

Precision beam pointing is the key indicator for APT (acquisition, pointing and tracking) system in space laser communication. The laser travels inside the optical system and the pointing vector will be affected by an assembly error of the axis and reflectors. In this paper, the model of the optical path pointing error and coaxiality error induced by the assembly error are established; the error distribution is given and a quantitative analysis is performed. The results show that the magnitude of pointing error is affected by the axis assembling error greatly but its distribution is susceptible to the reflector assembly error. Finally, the correction of coaxiality is performed and tested. The experimental results show that the coaxiality error can be greatly improved and the mean value of the coaxiality error of a beacon path and a signal path are 14 and 9.6 μrad, respectively, which meets the requirements. This work can provide guidance for design and assembly of the APT and contribute to the improvement of its pointing performance.
© 2021 WrocÅ‚aw University of Science and Technology. All rights reserved.
Number of references:14
Main heading:Errors
Controlled terms:Optical communication - Optical systems - Reflection
Uncontrolled terms:Acquisition , pointing and tracking - Assembling errors - Assembly error - Design and assemblies - Error distributions - Pointing errors - Provide guidances - Space laser communication
Classification code:717.1 Optical Communication Systems - 741.3 Optical Devices and Systems
DOI:10.37190/oa210205
Funding text:This article was supported by the 135 project of the Institute of Chinese Academy of Sciences (No. Y655811213). The coaxiality experiments were carried out in the key laboratory of space precision measurement technology, Chinese Academy of Sciences.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410162270
Title:Research on precision measurement and assembly technology of fery prism
Authors:Fu, Xihong (1, 2); Li, Libo (1, 2); Ma, Nana (1); Chou, Xiaoquan (1); Kang, Shifa (1); Li, Hua (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) Key Laboratory of Spectral Imaging Technology of CAS, Xi'an; 710119, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11763
Part number:1 of 1
Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications
Issue date:2021
Publication year:2021
Article number:1176304
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643611
Document type:Conference article (CA)
Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications
Conference date:November 5, 2020 - November 7, 2020
Conference location:Kunming, China
Conference code:167886
Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory
Publisher:SPIE
Abstract:From the special structure, processing technology and function of Fery prism in spectral imager, and the structural design features of a certain research spectral imager project, an assembly measurement method based on CMM, PSM and high precision rotating device is proposed, which combines the principles of space measurement, point source collimation and 3D mathematical modeling, the on-line inspection and alignment technology of Fery prism assembly are studied. Firstly, the key parameters of a single curved prism, such as curvature radius of surface, spherical coordinates, deflection angle of optical axis and off-axis are measured by CMM. Secondly, the Fery prism assembly is assembled by CMM, PSM and high precision rotating device. The space coordinates between the components are measured by CMM, and the position of the Spherical Center and the deflection angle are precisely determined by point source microscope. Finally, the actual assembly effect of the Fery Prism Assembly is reappeared through the data processing of the computer software, and the directional offset between the Fery prism assembly and the theoretical model is given, the precision assembly of Fery prism aseembly is completed by azimuth rotation and trimming mat processing. It provides a new technology method for on-line precision assembly of Fery prism module in Spectral Imager, which has strong operability and high measurement precision, and is suitable for precision detection and assembly of Fery prism module of different sizes.
© 2021 SPIE
Number of references:11
Main heading:Coordinate measuring machines
Controlled terms:3D modeling - Data handling - Functions - Prisms - Spectroscopy
Uncontrolled terms:Measurement precision - Point source microscopes - Precision assemblies - Precision detections - Precision measurement - Processing technologies - Spherical coordinates - Theoretical modeling
Classification code:723.2 Data Processing and Image Processing - 741.3 Optical Devices and Systems - 921 Mathematics - 943.3 Special Purpose Instruments
DOI:10.1117/12.2584980

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310473922
Title:Unsupervised Change Detection by Cross-Resolution Difference Learning
Authors:Zheng, Xiangtao (1); Chen, Xiumei (1); Lu, Xiaoqiang (2); Sun, Bangyong (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China (e-mail: luxq666666@gmail.com)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Issue date:2021
Publication year:2021
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Change detection (CD) aims to identify the differences between multitemporal images acquired over the same geographical area at different times. With the advantages of requiring no cumbersome labeled change information, unsupervised CD has attracted extensive attention of researchers. Multitemporal images tend to have different resolutions as they are usually captured at different times with different sensor properties. It is difficult to directly obtain one pixelwise change map for two images with different resolutions, so current methods usually resize multitemporal images to a unified size. However, resizing operations change the original information of pixels, which limits the final CD performance. This article aims to detect changes from multitemporal images in the originally different resolutions without resizing operations. To achieve this, a cross-resolution difference learning method is proposed. Specifically, two cross-resolution pixelwise difference maps are generated for the two different resolution images and fused to produce the final change map. First, the two input images are segmented into individual homogeneous regions separately due to different resolutions. Second, each pixelwise difference map is produced according to two measure distances, the mutual information distance and the deep feature distance, between image regions in which the pixel lies. Third, the final binary change map is generated by fusing and binarizing the two cross-resolution difference maps. Extensive experiments on four datasets demonstrate the effectiveness of the proposed method for detecting changes from different resolution images.
IEEE
Main heading:Learning systems
Controlled terms:Pixels
Uncontrolled terms:Different resolutions - Geographical area - Homogeneous regions - Multi-temporal image - Mutual informations - Resizing operations - Sensor properties - Unsupervised change detection
DOI:10.1109/TGRS.2021.3079907

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211110079184
Title:Research on 3D pose measurement algorithm based on binocular vision????(Open Access)
Authors:Shan, Fu Qiang (1); Wang, Feng (1); Zhang, Hai Feng (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of UCAS, University of Chinese Academy of Sciences, Xi'an, Shanxi; 710119, China
Corresponding author:Zhang, Hai Feng(Zhanghf@opt.ac.cn)
Source title:Journal of Physics: Conference Series
Abbreviated source title:J. Phys. Conf. Ser.
Volume:1792
Part number:1 of 1
Issue:1
Issue title:International Conference on Communications, Information System and Software Engineering, CISSE 2020
Issue date:February 19, 2021
Publication year:2021
Article number:012043
Language:English
ISSN:17426588
E-ISSN:17426596
Document type:Conference article (CA)
Conference name:2020 International Conference on Communications, Information System and Software Engineering, CISSE 2020
Conference date:December 18, 2020 - December 20, 2020
Conference location:Guangzhou, China
Conference code:167641
Publisher:IOP Publishing Ltd
Abstract:Based on binocular vision, this paper proposes an algorithm for fast and accurate three-dimensional measurement. The binocular 3D measurement system is mainly divided into four parts: binocular calibration, binocular correction, binocular matching and pose calculation. In this paper, an international softwareM is used to achieve camera calibration, the FAST algorithm is used to achieve the extraction of feature points, and the matching method that combines gray-level correlation coefficient (cc) and epipolar constraint is selected. Experiments have verified that this algorithm can accurately achieve three-dimensional pose measurement.
© 2021 Journal of Physics: Conference Series.
Number of references:6
Main heading:Data communication systems
Controlled terms:Binocular vision - Binoculars - Calibration - Information systems - Information use - Software engineering
Uncontrolled terms:3-D measurement systems - 3D pose measurement - Binocular calibrations - Binocular matching - Camera calibration - Epipolar constraints - Extraction of feature points - Three-dimensional measurements
Classification code:723.1 Computer Programming - 741.2 Vision - 741.3 Optical Devices and Systems - 903.3 Information Retrieval and Use
DOI:10.1088/1742-6596/1792/1/012043

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20211710250118
Title:Spectroscopic properties of ErF3 doped tellurite-gallium oxyfluoride glass for ∼3 μm laser materials????(Open Access)
Authors:Wan, Rui (1, 2); Wang, Pengfei (1, 2); Li, Shengwu (1, 2); Ma, Yuan (1, 2); Zhang, Guangwei (3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Zhejiang Fountain Aptitude Technology Inc., Hangzhou; 310051, China
Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)
Source title:Journal of Applied Physics
Abbreviated source title:J Appl Phys
Volume:129
Issue:15
Issue date:April 21, 2021
Publication year:2021
Article number:153105
Language:English
ISSN:00218979
E-ISSN:10897550
CODEN:JAPIAU
Document type:Journal article (JA)
Publisher:American Institute of Physics Inc.
Abstract:

ErF3-doped TeO2-Ga2O3-BaF2-AlF3-Y2O3 (TGBAY) glasses with high fluorescence efficiency and a high thermal damage threshold were developed for potential mid-infrared fiber laser applications. A model 2.7-μm fiber laser based on this material was analyzed using rate and propagation equations. Under 808 and 980 nm laser pumping, fluorescence emissions with central wavelength at 1.55 and 2.73 μm were detected. Based on the Judd-Ofelt (J-O) theory, the intensity parameters (Ωλ, λ = 2, 4, and 6) and radiative transition property were calculated and characterized through absorption and emission spectra. The results indicated that tellurite-gallium oxyfluoride glass had a high glass transition temperature (Tg, ∼391 °C), large emission cross sections at 1.55 μm (6.32 × 10−21 cm2) and 2.73 μm (9.68 × 10−21 cm2) as well as a longer fluorescence lifetime (6.84 ms at 1.55 μm and 262 μs at 2.73 μm) relative to the conventional Er3+-doped tellurite glass. The temperature dependence of the emission spectra indicated that TGBAY-2Er glass was more favorable to achieve infrared emission at low temperatures. Numerical simulation revealed the feasibility of achieving a ∼2.7 μm fiber laser operation based on the developed Er3+-doped tellurite-gallium oxyfluoride glass fiber.
© 2021 Author(s).
Number of references:66
Main heading:Gallium compounds
Controlled terms:Aluminum compounds - Barium compounds - Emission spectroscopy - Erbium compounds - Fiber lasers - Fibers - Fluorescence - Glass - Glass transition - Judd-Ofelt theory - Laser applications - Pumping (laser) - Tellurium compounds - Temperature distribution
Uncontrolled terms:Absorption and emission spectra - Emission cross section - Fluorescence efficiency - Fluorescence lifetimes - High-glass transition temperatures - Radiative transitions - Spectroscopic property - Temperature dependence
Classification code:641.1 Thermodynamics - 741.1 Light/Optics - 744 Lasers - 802.3 Chemical Operations - 812.3 Glass - 931.3 Atomic and Molecular Physics
Numerical data indexing:Size 2.70e-06m
DOI:10.1063/5.0047010

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20210609894342
Title:Generation and Conversion Dynamics of Dual Bessel Beams with a Photonic Spin-Dependent Dielectric Metasurface
Authors:Li, Tianyue (1); Li, Xingyi (2, 3); Yan, Shaohui (2, 3); Xu, Xiaohao (4); Wang, Shuming (1, 5); Yao, Baoli (2, 3); Wang, Zhenlin (1); Zhu, Shining (1, 5)
Author affiliation:(1) National Laboratory of Solid-State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing; 210093, China; (2) State Key Laboratory of Transient Optics, Photonics xi'An Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Nanophotonics, Jinan University, Guangzhou; 511443, China; (5) Key Laboratory of Intelligent Optical Sensing and Manipulation Ministry of Education, Nanjing; 210093, China
Corresponding author:Wang, Shuming(wangshuming@nju.edu.cn)
Source title:Physical Review Applied
Abbreviated source title:Phys. Rev. Appl.
Volume:15
Issue:1
Issue date:January 2021
Publication year:2021
Article number:A56
Language:English
E-ISSN:23317019
Document type:Journal article (JA)
Publisher:American Physical Society
Abstract:A Bessel beam has the properties of propagation invariance and a self-healing effect, leading to a variety of interesting phenomena and applications. Recently, as a planar diffractive element with miniaturized size, metasurfaces are widely employed to manipulate light in the subwavelength region, including generating a Bessel beam. However, such a metasurface-generated Bessel beam allows output light with no tunable functions. Here, with the interplay of the geometric phase and the dynamic phase, we propose a method to generate and allow conversion from any orthogonal polarizations to independent Bessel beams with a single-layer dielectric metasurface. The simulation results indicate that the arbitrary conversion between different Bessel beams is related to the spin-dependent orbit motion caused by the tight-focusing effect, leading to the singularity of the spot. This physical mechanism is well studied and the theoretical model for revealing the dependence of different incident polarization on the conversion dynamics is presented. Our approach paves a way for efficient generation and multifunctional applications, ranging from high-numerical-aperture devices to compact nanophotonic platforms for spin-dependent structured beams.
© 2021 American Physical Society.
Number of references:39
Main heading:Spin fluctuations
Controlled terms:Bessel functions - Laser beams - Light sources - Polarization
Uncontrolled terms:Diffractive element - High numerical apertures - Incident polarization - Orthogonal polarizations - Physical mechanism - Propagation invariance - Self healing effect - Theoretical modeling
Classification code:744.8 Laser Beam Interactions - 921 Mathematics - 931.3 Atomic and Molecular Physics
DOI:10.1103/PhysRevApplied.15.014059
Funding details: Number: 2016YFA0202103,2017YFA0303700,2017YFA0303702, Acronym: -, Sponsor: -;Number: 11621091,11674166,11674167,11674168,11774162,11774164,11822406,11834007,91850204, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:The authors are grateful that this work is supported by the National Key R&D Program of China (Grants No. 2017YFA0303700, No. 2017YFA0303702, and No. 2016YFA0202103) and the National Natural Science Foundation of China (Grants No. 11822406, No. 11834007, No. 11774162, No. 11674166, No. 11674167, No. 11674168, No. 11621091, No. 11774164, and No. 91850204).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212110404350
Title:Design of Optical System for Broadband and Integrated AOTF Imaging Spectrometer
Title of translation:宽谱段一体化AOTF成像光谱仪光学系统设计
Authors:Chang, Lingying (1); Zhang, Qiang (1); Qiu, Yuehong (2)
Author affiliation:(1) School of Electronic Engineering, Xi'an University of Posts & Telecommunications, Xi'an; 710121, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Source title:Guangxue Xuebao/Acta Optica Sinica
Abbreviated source title:Guangxue Xuebao
Volume:41
Issue:7
Issue date:April 10, 2021
Publication year:2021
Article number:0722002
Language:Chinese
ISSN:02532239
CODEN:GUXUDC
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

Acousto-optic tunable filter (AOTF) imaging spectrometer can acquire image, spectrum and polarization information simultaneously. It has been successfully applied to the aerospace, agriculture, forestry, medicine, food safety, and other fields, thus having good development prospects. Optical system is one of the key parts in an AOTF imaging spectrometer to obtain information. Therefore, the optical systems of common AOTF imaging spectrometers are studied in this paper, and the working principle of AOTF and the general design scheme of the spectrometers are introduced. Furthermore, the optical design parameters of the whole system, such as the front, collimating and imaging sub-systems are calculated, and the common-aperture optical system is simulated. The front optical system has an off-axis three-mirror structure based on free-form surface, which matches with the aperture stop of the collimating system, and the collimating and imaging systems are off-axis three-mirror systems with front offset of the aperture stop. The simulation results show that the system has an MTF values close to the diffraction limit and greater than 0.57 at the bands of 0.41.0 μm, 1.03.0 μm, and 3.05.0 μm, a distortion less than 5%, and good imaging quality, in the case of the working band of 0.45.0 μm, F number 5, field of view angle of 5.3°.
© 2021, Chinese Lasers Press. All right reserved.
Number of references:32
Main heading:Optical systems
Controlled terms:Agricultural robots - Diffraction - Forestry - Mirrors - Optical design - Spectrometers
Uncontrolled terms:Acousto-optic tunable filters - Design parameters - Development prospects - Diffraction limits - Free-form surface - Imaging spectrometers - Mirror structure - Off-axis three mirror system
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems
Numerical data indexing:Percentage 5.00e+00%
DOI:10.3788/AOS202141.0722002

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210409805908
Title:Bidirectional Interaction Network for Person Re-Identification
Authors:Chen, Xiumei (1); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)
Author affiliation:(1) CAS Key Laboratory of Spectral Imaging Technology, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)
Source title:IEEE Transactions on Image Processing
Abbreviated source title:IEEE Trans Image Process
Volume:30
Issue date:2021
Publication year:2021
Pages:1935-1948
Article number:9321734
Language:English
ISSN:10577149
E-ISSN:19410042
CODEN:IIPRE4
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Person re-identification (ReID) task aims to retrieve the same person across multiple spatially disjoint camera views. Due to huge image changes caused by various factors such as posture variation and illumination transformation, images of different persons may share the more similar appearances than images of the same one. Learning discriminative representations to distinguish details of different persons is significant for person ReID. Many existing methods learn discriminative representations resorting to a human body part location branch which requires cumbersome expert human annotations or complex network designs. In this article, a novel bidirectional interaction network is proposed to explore discriminative representations for person ReID without any human body part detection. The proposed method regards multiple convolutional features as responses to various body part properties and exploits the inter-layer interaction to mine discriminative representations for person identities. Firstly, an inter-layer bilinear pooling strategy is proposed to feasibly exploit the pairwise feature relations between two convolution layers. Secondly, to explore interaction of multiple layers, an effective bidirectional integration strategy consisting of two different multi-layer interaction processes is designed to aggregate bilinear pooling interaction of multiple convolution layers. The interaction of multiple layers is implemented in a layer-by-layer nesting policy to ensure the two interaction processes are different and complementary. Extensive experiments validate the superiority of the proposed method on four popular person ReID datasets including Market-1501, DukeMTMC-ReID, CUHK03-NP and MSMT17. Specifically, the proposed method achieves a rank-1 accuracy of 95.1% and 88.2% on Market-1501 and DukeMTMC-ReID, respectively.
© 1992-2012 IEEE.
Number of references:47
Main heading:Convolution
Controlled terms:Commerce - Complex networks
Uncontrolled terms:Bi-directional interaction - Human annotations - Integration strategy - Interaction process - Interlayer interactions - Multiple convolution - Multiple layers - Person re identifications
Classification code:716.1 Information Theory and Signal Processing - 722 Computer Systems and Equipment
Numerical data indexing:Percentage 8.82e+01%, Percentage 9.51e+01%
DOI:10.1109/TIP.2021.3049943

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310136038
Title:All-optical RF spectrum analyzer with a 5 THz bandwidth based on CMOS-compatible high-index doped silica waveguides????(Open Access)
Authors:Li, Yuhua (1, 2); Kang, Zhe (3, 4); Zhu, Kun (2); Ai, Shiqi (2); Wang, Xiang (5); Davidson, Roy R. (5); Wu, Yan (1); Morandotti, Roberto (6); Little, Brent E. (7); Moss, David J. (8); Tak Chu, Sai (2)
Author affiliation:(1) Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Department of Physics, City University of Hong Kong, Kowloon Tong, Hong Kong; 999077, China; (3) Ningbo Research Institute, Zhejiang University, Ningbo; 315100, China; (4) Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical Instruments, Zhejiang University, Hangzhou; 310058, China; (5) QXP Technology, Xi’an; 710311, China; (6) INRS-Énergie, Matériaux et Télécommunications, Varennes; J3X 1S2, Canada; (7) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an; 710119, China; (8) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia
Corresponding author:Zhu, Kun(kenny.kun.zhu@gmail.com)
Source title:Optics Letters
Abbreviated source title:Opt. Lett.
Volume:46
Issue:7
Issue date:April 1, 2021
Publication year:2021
Pages:1574-1577
Language:English
ISSN:01469592
E-ISSN:15394794
CODEN:OPLEDP
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:We report an all-optical radio-frequency (RF) spectrum analyzer with a bandwidth greater than 5 THz, based on a 50 cm long spiral waveguide in a CMOS-compatible high-index doped silica platform. By carefully mapping out the dispersion profile of the waveguides for different thicknesses, we identify the optimal design to achieve near-zero dispersion in the C-band. To demonstrate the capability of the RF spectrum analyzer, we measure the optical output of a femtosecond fiber laser with an ultrafast optical RF spectrum in the terahertz regime.
© 2021 Optical Society of America
Number of references:21
Main heading:Optical waveguides
Controlled terms:Bandwidth - CMOS integrated circuits - Femtosecond lasers - Fiber lasers - Silica - Spectrum analyzers
Uncontrolled terms:All-optical RF-spectrum analyzers - CMOS Compatible - Dispersion profile - Femtosecond fiber lasers - Near-zero dispersions - Optical output - Optimal design - Radio frequency spectrum
Classification code:714.2 Semiconductor Devices and Integrated Circuits - 714.3 Waveguides - 716.1 Information Theory and Signal Processing - 744.4 Solid State Lasers
Numerical data indexing:Frequency 5.00e+12Hz, Size 5.00e-01m
DOI:10.1364/OL.420716
Funding details: Number: -, Acronym: NSERC, Sponsor: Natural Sciences and Engineering Research Council of Canada;Number: -, Acronym: -, Sponsor: Canada Research Chairs;Number: 62075188, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: ECS-2301818,GRF-11303619, Acronym: UGC, Sponsor: University Grants Committee;Number: XDB24030300, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: RGC, UGC, Sponsor: Research Grants Council, University Grants Committee;Number: LGG21A040003,LY21F050007, Acronym: ZJNSF, Sponsor: Natural Science Foundation of Zhejiang Province;
Funding text:Funding. National Natural Science Foundation of China (62075188); Zhejiang Provincial Natural Science Foundation of China (LGG21A040003, LY21F050007); NSERC Strategic and Discovery Programs, Canada; Canada Research Chair program; Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030300); Hong Kong Research Grants Council, University Grants Committee (ECS-2301818, GRF-11303619).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20213410817489
Title:Spectral Super-Resolution of Multispectral Images Using Spatial-Spectral Residual Attention Network
Authors:Zheng, Xiangtao (1); Chen, Wenjing (2); Lu, Xiaoqiang (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi 710119, China.; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi 710119, China (e-mail: luxq666666@gmail.com)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Issue date:2021
Publication year:2021
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

The spectral super-resolution of multispectral image (MSI) refers to improving the spectral resolution of the MSI to obtain the hyperspectral image (HSI). Most recent works are based on the sparse representation to unfold the MSI into the 2-D matrix in advance for subsequent operations, which results in that the spatial information of MSI cannot be fully explored. In this article, a spatial-spectral residual attention network (SSRAN) is proposed to simultaneously explore the spatial and spectral information of MSI for reconstructing the HSI. The proposed SSRAN is composed of the feature extraction part, the nonlinear mapping part, and the reconstruction part. Firstly, the multispectral features of the input MSI are extracted in the feature extraction part. Second, in the nonlinear mapping part, the spatial-spectral residual blocks are proposed to explore spatial and spectral information of MSI for mapping the multispectral features to the hyperspectral features. Finally, in the reconstruction part, a 2-D convolution is used to reconstruct the HSI from the hyperspectral features. Also, a neighboring spectral attention module is specially designed to explicitly constrain the reconstructed HSI to maintain the correlation among neighboring spectral bands. The proposed SSRAN outperforms the state-of-the-art methods on both simulated and real databases.
IEEE
Main heading:Photomapping
Controlled terms:Extraction - Feature extraction - Image enhancement - Optical resolving power - Spectroscopy
Uncontrolled terms:2-D convolution - Multispectral images - Nonlinear mappings - Sparse representation - Spatial informations - Spectral information - State-of-the-art methods - Super resolution
Classification code:405.3 Surveying - 741.1 Light/Optics - 802.3 Chemical Operations
DOI:10.1109/TGRS.2021.3104476

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204609496783
Title:A compact bionic compound eye camera for imaging in a large field of view
Authors:Wang, Yuanyuan (1); Shi, Chengyong (3); Xu, Huangrong (2); Zhang, Yuanjie (2); Yu, Weixing (2)
Author affiliation:(1) School of Science, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No. 17, Xinxi Road, Xian; 710119, China; (3) State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics & Physics, Chinese Academy of Sciences, No. 3888, Dongnanhu Road, Changchun; Jinlin, China
Corresponding author:Yu, Weixing(yuwx@opt.ac.cn)
Source title:Optics and Laser Technology
Abbreviated source title:Opt Laser Technol
Volume:135
Issue date:March 2021
Publication year:2021
Article number:106705
Language:English
ISSN:00303992
CODEN:OLTCAS
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:The traditional imaging technologies, such as two-dimensional imaging, have not been able to meet people's needs for higher technology. Inspired by the characteristics, such as small size, sensitivity to moving targets and large field of view, researchers began to study bionic compound eyes. In this paper, a hemispherical mounting surface with through holes to set the compound lens array is fabricated by 3-D printing technology. More than one hundred small lenses are mounted on the 3-D printed hemispherical surface to form a bionic curved compound eye, which is then integrated with an optical relay system and an CMOS imaging sensor to form a rather compact bionic compound eye camera. The addition of the optical relay system solves the problem that the mismatch between the curved focal plane formed by the curved compound eye and the flat focal plane of the CMOS imaging sensor. By employing this method, we design and analyze the curved lens array and optical relay system, and perform the related optical performance tests on the fabricated bionic curved compound eye imaging system. The results show that a good image quality can be achieved. The formed bionic compound eye imaging prototype system rather compact and has a weight of only 121 g, a volume of 34 mm × 44 mm × 80 mm, and a field of view of 120° × 120°. This system has great potential and value in military, medical, and engineering applications.
© 2020 Elsevier Ltd
Number of references:25
Main heading:Bionics
Controlled terms:Cameras - CMOS integrated circuits - Focusing - Imaging techniques - Lenses - Military applications
Uncontrolled terms:Bionic compound eye - CMOS imaging sensor - Curved lens arrays - Engineering applications - Hemispherical surfaces - Large field of views - Optical performance - Two-dimensional imaging
Classification code:404.1 Military Engineering - 461.1 Biomedical Engineering - 714.2 Semiconductor Devices and Integrated Circuits - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 746 Imaging Techniques
Numerical data indexing:Mass 1.21e-01kg, Size 8.00e-02m
DOI:10.1016/j.optlastec.2020.106705
Funding details: Number: 2019JM-302, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 61975231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This research was funded by National Science Foundation of China (NSFC) (61975231) and Natural Science Foundation of Shaanxi Province (2019JM-302).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213610872308
Title:Performance of a visible light photon counting imaging detector for weak light intensities
Authors:Liu, Yong’an (1, 2); Sheng, Lizhi (1); Zhao, Hui (1); Tian, Jinshou (1); Zhao, Baosheng (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China; (2) Xi’an Institute of Optics and Precision Mechanics, University of Chinese Academy of Sciences, Beijing, China
Corresponding author:Liu, Yong’an(liuya@opt.ac.cn)
Source title:Journal of Modern Optics
Abbreviated source title:J. Mod. Opt.
Issue date:2021
Publication year:2021
Language:English
ISSN:09500340
E-ISSN:13623044
CODEN:JMOPEW
Document type:Article in Press
Publisher:Taylor and Francis Ltd.
Abstract:

In this study, a visible light photon-counting imaging detector was developed for weak light intensities, such as biofluorescence and photon-counting 3D imaging radars. The proposed visible light photon-counting imaging detector was based on a semitransparent S25 photocathode able of responding to visible light or even near-infrared wavelengths. The detector adopted image charge readout mode through high-resistance Ge layer receiver of electron cloud from the microchannel plate. The performance of the as-obtained visible light photon-counting imaging detector was tested in existing readout electronics and newly designed position-sensitive anodes. The quantum efficiency of the as-prepared detector reached 13.4% (@532 nm) with spatial resolution better than 100 μm. Preliminary imaging results of real objects with commercial lens and detector were also obtained and applied to ultra-weak light detection. In sum, these results look promising for future applications in photon-counting radars and biofluorescence imaging.
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
Number of references:14
Main heading:Light
Controlled terms:Infrared devices - Photons - Radar
Uncontrolled terms:Electron clouds - Future applications - High resistance - Micro channel plate - Near-infrared wavelength - Position-sensitive anodes - Readout Electronics - Spatial resolution
Classification code:716.2 Radar Systems and Equipment - 741.1 Light/Optics - 931.3 Atomic and Molecular Physics
Numerical data indexing:Size 1.00e-04m
DOI:10.1080/09500340.2021.1968053

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509874593
Title:The design and fabrication of freeform lenses for generating complex illumination patterns on curved surfaces
Authors:Zhang, YuPeng (1, 2); Mao, Xianglong (1); Xie, Yongjun (1); Li, Jinpeng (1); Wang, Fengbiao (1); Gao, Rong (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:1176120
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:Freeform optics have been found in a variety of beam shaping designs. However, they are typically used to form prescribed illumination patterns on a planar surface. In this paper, we will demonstrate a ray mapping based method to design smooth freeform lenses to form complicated illumination distributions on curved surfaces. The ray mapping between the source and target is established by solving an optimal mass transportation problem which is governed by the Monge-Ampére partial differential equation. Then, the freeform lens is constructed by a geometric method based on the optimal ray mapping. Finally, the performance of the lens is verified by Monte Carlo ray tracing simulation in Zemax OpticStudio software. To show the effectiveness of the proposed method, several freeform lenses are designed as examples for a collimated light source to generate different illumination patterns on different curved surfaces. A freeform lens is also fabricated and experimented.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:12
Main heading:Design
Controlled terms:Computer software - Fabrication - Flickering - Mapping - Mass transportation - Monte Carlo methods - Photonics
Uncontrolled terms:Collimated light - Curved surfaces - Freeform optics - Geometric method - Illumination distribution - Illumination patterns - Monte-Carlo ray tracing - Transportation problem
Classification code:405.3 Surveying - 723 Computer Software, Data Handling and Applications - 741.1 Light/Optics - 922.2 Mathematical Statistics
DOI:10.1117/12.2586416

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110705823
Title:Adaptive Weighted Exposure Algorithm Based on Region Luminance Detection
Authors:Yang, Lei (1, 2); Zhang, Derui (1, 2); Cao, Jianzhong (1, 2); Zhang, Hui (1, 2); Wang, Hua (1, 2); Bian, He (2); Wang, Huawei (2)
Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xi'an Institute of Optics and Precision Mechanics Chinese, Academy of Sciences, Xi'an; 710119, China
Source title:2021 IEEE 3rd International Conference on Communications, Information System and Computer Engineering, CISCE 2021
Abbreviated source title:IEEE Int. Conf. Commun., Inf. Syst. Comput. Eng., CISCE
Part number:1 of 1
Issue title:2021 IEEE 3rd International Conference on Communications, Information System and Computer Engineering, CISCE 2021
Issue date:May 14, 2021
Publication year:2021
Pages:539-542
Article number:9445988
Language:English
ISBN-13:9780738112152
Document type:Conference article (CA)
Conference name:3rd IEEE International Conference on Communications, Information System and Computer Engineering, CISCE 2021
Conference date:May 14, 2021 - May 16, 2021
Conference location:Beijing, China
Conference code:170477
Sponsor:IEEE
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

When the traditional global auto-exposure algorithm is applied to high contrast special scenes such as dark background and bright target, there is often over-exposure of the target, which leads to the loss of the key information of the subject concerned. To solve this problem, an adaptive weight exposure method based on regional brightness detection is proposed. Firstly, the whole imaging field of view is divided into several regions, and then the position of the target in the field of view is identified by independent judgment. Finally, the automatic exposure control of gray statistics is carried out according to the preset region weight. The experimental results show that the proposed method can effectively improve the image quality of the bright target or dark target in the dark background, avoid the phenomenon of the target too bright or too dark, and better capture the texture features of the target.
© 2021 IEEE.
Number of references:7
Main heading:Data communication systems
Controlled terms:Image enhancement - Information systems - Information use - Luminance - Textures
Uncontrolled terms:Adaptive weights - Auto exposure - Field of views - Gray statistics - High contrast - Imaging fields - Texture features
Classification code:903.3 Information Retrieval and Use
DOI:10.1109/CISCE52179.2021.9445988

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211210117108
Title:Design of Φ450 mm light-weighted SiC mirror subsystem in space-based astronomy telescope
Title of translation:Φ450 mm口径空间天文相机轻量化碳化硅主反射镜组件设计
Authors:Feng, Liangjie (1); Cheng, Pengfei (1); Wang, Wei (1)
Author affiliation:(1) The Space Optical Technology Research Department, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China
Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.
Volume:50
Issue:2
Issue date:February 25, 2021
Publication year:2021
Article number:20200175
Language:Chinese
ISSN:10072276
Document type:Journal article (JA)
Publisher:Chinese Society of Astronautics
Abstract:A Φ450 mm primary mirror subsystem of a space-based astronomy telescope was designed with mass, optical surface distortion and reflectivity requirement. The open-back primary mirror was made of pressure-less sintering silicon carbide, light-weighted at a ratio of approximately 70%. Three side supporting invar flexure bipods were designed to minimize the assembling stress and the thermal stress. The high reflection was obtained from the optical surface cementite. The mirror weighted 7 kg and the reflectivity was 98% after optical polishing. The mirror subsystem was precisely assembled under the strict technical condition. The optical test with interferometer show that the optical surface distortion is less than 0.02λ RMS, which meet the critical optical requirements for the primary mirror of the space-based astronomy telescope.
Copyright ©2021 Infrared and Laser Engineering. All rights reserved.
Number of references:14
Main heading:Optical testing
Controlled terms:Carbides - Mirrors - Reflection - Silicon carbide - Sintering - Telescopes
Uncontrolled terms:Optical polishing - Optical surfaces - Pressure-less sintering - Primary mirrors - SiC mirrors - Space-based - Technical conditions
Classification code:741.3 Optical Devices and Systems - 804.2 Inorganic Compounds
Numerical data indexing:Mass 7.00e+00kg, Percentage 7.00e+01%, Percentage 9.80e+01%
DOI:10.3788/IRLA20200175
Funding text:Space Variable Objects Monitor

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310473040
Title:Mutual Attention Inception Network for Remote Sensing Visual Question Answering
Authors:Zheng, Xiangtao (1); Wang, Binqiang (2); Du, Xingqian (2); Lu, Xiaoqiang (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China (e-mail: luxq666666@gmail.com)
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Issue date:2021
Publication year:2021
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Remote sensing images (RSIs) containing various ground objects have been applied in many fields. To make semantic understanding of RSIs objective and interactive, the task remote sensing visual question answering (VQA) has appeared. Given an RSI, the goal of remote sensing VQA is to make an intelligent agent answer a question about the remote sensing scene. Existing remote sensing VQA methods utilized a nonspatial fusion strategy to fuse the image features and question features, which ignores the spatial information of images and word-level information of questions. A novel method is proposed to complete the task considering these two aspects. First, convolutional features of the image are included to represent spatial information, and the word vectors of questions are adopted to present semantic word information. Second, attention mechanism and bilinear technique are introduced to enhance the feature considering the alignments between spatial positions and words. Finally, a fully connected layer with softmax is utilized to output an answer from the perspective of the multiclass classification task. To benchmark this task, a RSIVQA dataset is introduced in this article. For each of more than 37,000 RSIs, the proposed dataset contains at least one or more questions, plus corresponding answers. Experimental results demonstrate that the proposed method can capture the alignments between images and questions. The code and dataset are available at https://github.com/spectralpublic/RSIVQA.
IEEE
Main heading:Remote sensing
Controlled terms:Alignment - Semantics
Uncontrolled terms:Attention mechanisms - Fusion strategies - Multi-class classification - Question Answering - Remote sensing images - Semantic understanding - Spatial informations - Spatial positions
Classification code:601.1 Mechanical Devices
DOI:10.1109/TGRS.2021.3079918

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310464071
Title:Semisupervised Spectral Degradation Constrained Network for Spectral Super-Resolution
Authors:Chen, Wenjing (1); Zheng, Xiangtao (2); Lu, Xiaoqiang (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China (e-mail: xiangtaoz@gmail.com); (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.
Source title:IEEE Geoscience and Remote Sensing Letters
Abbreviated source title:IEEE Geosci. Remote Sens. Lett.
Issue date:2021
Publication year:2021
Language:English
ISSN:1545598X
E-ISSN:15580571
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Recently, various deep learning-based methods have been designed to improve the spectral resolution of the multispectral image (MSI) to obtain the hyperspectral image (HSI). These methods usually rely on sufficient MSI/HSI pairs for supervised training. However, collecting plentiful HSIs is time-consuming. In this letter, a semisupervised spectral degradation constrained network (SSDCN) is proposed to improve the spectral resolution of MSI. SSDCN is an autoencoder-like network that is composed of an encoder subnetwork for estimating HSI from input MSI and a decoder subnetwork for reconstructing MSI from the estimated HSI. A semisupervised training method is proposed to explore both MSI/HSI pairs and MSIs without ground-truth HSIs to optimize SSDCN. Simulated and two real databases are employed to demonstrate the effectiveness of SSDCN.
IEEE
Main heading:Learning systems
Controlled terms:Deep learning - Image enhancement - Spectral resolution - Spectroscopy
Uncontrolled terms:Auto encoders - Learning-based methods - Multispectral images - Real database - Semi-supervised - Semi-supervised trainings - Super resolution - Supervised trainings
Classification code:741.1 Light/Optics
DOI:10.1109/LGRS.2021.3079961

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:6363315
Title:Residual self-calibration and self-attention aggregation network for crop disease recognition
Authors:Zhang, Qiang (1); Sun, Banyong (2); Cheng, Yaxiong (1); Li, Xijie (2)
Author affiliation:(1) School of Science, Wuhan University of Technology, Wuhan; 430070, China; (2) Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics of CAS, Xinxi Road No. 17, Xi’an; 710119, China
Corresponding author:Li, Xijie(lixijie@opt.ac.cn)
Source title:International Journal of Environmental Research and Public Health
Abbreviated source title:Int. J. Environ. Res. Public Health
Volume:18
Issue:16
Issue date:August 2, 2021
Publication year:2021
Article number:8404
Language:English
ISSN:16617827
E-ISSN:16604601
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

The correct diagnosis and recognition of crop diseases play an important role in ensuring crop yields and preventing food safety. The existing methods for crop disease recognition mainly focus on accuracy while ignoring the algorithm’s robustness. In practice, the acquired images are often accompanied by various noises. These noises lead to a huge challenge for improving the robustness and accuracy of the recognition algorithm. In order to solve this problem, this paper proposes a residual self-calibration and self-attention aggregation network (RCAA-Net) for crop disease recognition in actual scenarios. The proposed RCAA-Net is composed of three main modules: (1) multi-scale residual module, (2) feedback self-calibration module, and (3) self-attention aggregation module. Specifically, the multi-scale residual module is designed to learn multi-scale features and provide both global and local information for the appearance of the disease to improve the performance of the model. The feedback self-calibration is proposed to improve the robustness of the model by suppressing the background noise in the original deep features. The self-attention aggregation module is introduced to further improve the robustness and accuracy of the model by capturing multi-scale information in different semantic spaces. The experimental results on the challenging 2018ai_challenger crop disease recognition dataset show that the proposed RCAA-Net achieves state-of-the-art performance on robustness and accuracy for crop disease recognition in actual scenarios.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:34
Controlled terms:accuracy assessment - algorithm - calibration - crop damage - disease - image analysis
Classification code:71.8.5.4 Remote sensing: numerical and image analysis
DOI:10.3390/ijerph18168404
Funding details: Number: 62001378, Acronym: NSFC;NNSF;NNSFC, Sponsor: National Natural Science Foundation of China;Number: 62076199, Acronym: NSFC;NNSF;NNSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 62001378, in part by National Natural Science Foundation of China (62076199), in part by the Shaanxi Provincial Department of Education 2020 Scientific Research Plan under Grant 20JK0913, and in part by the Shaanxi Province Network Data Analysis and Intelligent Processing Key Laboratory Open Fund under Grant XUPT-KLND (201902).

 

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110716910
Title:Design of underwater large field of view zoom optical system
Title of translation:水下大视场连续变焦光学系统设计
Authors:Qu, Rui (1, 2); Yang, Jianfeng (1); Cao, Jianzhong (1); Liu, Bo (1)
Author affiliation:(1) Xi'an Institute of Optical and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Univisity of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.
Volume:50
Issue:7
Issue date:July 25, 2021
Publication year:2021
Article number:20200468
Language:Chinese
ISSN:10072276
Document type:Journal article (JA)
Publisher:Chinese Society of Astronautics
Abstract:

Under the requirements of an underwater large field of view zoom optical system, the selection of optical window and its influence on objective lens were discussed, by which the relative distortion and lateral color induced by the plane window were analyzed and corresponding design methods were given. Regarding the special envelope and working distance requirements of the underwater optical system, a three-part zoom system design model and the design method of the corresponding focusing components were provided by introducing aberration stabilizers in the PNNP structure, dynamic aberration correction capability of the optical structure was improved, also, the problems of the cam curve breakpoints were avoided; by setting the focus lens group in the objective parts, close-range imaging through the entire zoom range was guaranteed. A 4 K underwater large field of view zoom optical system was completed using 3840×2160 high-sensitivity CMOS detector, with 0.5 m-inf working distance, 0.48−0.64 μm work waveband, constant F number of up to 2.8 and 5.9°−62° full field of view. The image quality and tolerance characters are validated by an assembled lens and its underwater imaging experiments.
Copyright ©2021 Infrared and Laser Engineering. All rights reserved.
Number of references:31
Main heading:Optical systems
Controlled terms:Aberrations - Lenses - Optical design - Structural design - Underwater imaging
Uncontrolled terms:Dynamic aberrations - High sensitivity - Imaging experiments - Large field of views - Optical structures - Relative distortion - Working distances - Zoom optical system
Classification code:408.1 Structural Design, General - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 746 Imaging Techniques
Numerical data indexing:Temperature 4.00e+00K
DOI:10.3788/IRLA20200468

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213210747788
Title:High-throughput fast full-color digital pathology based on Fourier ptychographic microscopy via color transfer????(Open Access)
Authors:Gao, Yuting (1, 2); Chen, Jiurun (1, 2); Wang, Aiye (1, 2); Pan, An (1); Ma, Caiwen (1); Yao, Baoli (1, 2)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Pan, An(panan@opt.cnemailcwma@opt.ac.cn)Ma, Caiwen(cwma@opt.ac.cn)
Source title:Science China: Physics, Mechanics and Astronomy
Abbreviated source title:SCI. CHINA Phys. Mech. Astron.
Volume:64
Issue:11
Issue date:November 2021
Publication year:2021
Article number:114211
Language:English
ISSN:16747348
E-ISSN:18691927
Document type:Journal article (JA)
Publisher:Science in China Press
Abstract:

The usage of full-color imaging in digital pathology produces significant results. Compared with a grayscale image or a pseudocolor image containing contrast information, a full-color image can identify and detect the target object better with color texture information. Fourier ptychographic microscopy (FPM) is a high-throughput computational imaging technique that breaks the tradeoff between high resolution (HR) and a large field of view. It also eliminates the artifacts of scanning and stitching in digital pathology and improves its imaging efficiency. However, the conventional full-color digital pathology based on FPM is still time-consuming because of the repeated experiments with tri-wavelengths. A color transfer FPM approach termed "CFPM" was reported. The color texture information of a low-resolution full-color pathologic image is directly transferred to the HR grayscale FPM image captured by only a single wavelength. Both of the color space of FPM based on the standard CIE-XYZ color model and the display based on the standard RGB color space were established. Different FPM colorization schemes were analyzed and compared with 30 biological samples. Three types of evaluation approaches were provided, including the root-mean-square error (RMSE), the difference maps, and the image histogram cosine similarity. The average RMSE values of the conventional method and CFPM compared with the ground truth were 5.3% and 5.7%, respectively. Therefore, the reconstruction time is significantly reduced by 2/3 with the sacrifice of precision of only 0.4%. The CFPM method is also compatible with advanced fast FPM approaches to further reduce computation time.
© 2021, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Number of references:46
Main heading:Color
Controlled terms:Image texture - Imaging techniques - Mean square error - Object detection - Pathology - Textures
Uncontrolled terms:Color-texture information - Computational imaging - Conventional methods - Digital pathologies - Evaluation approach - Imaging efficiency - Large field of views - Root mean square errors
Classification code:461.6 Medicine and Pharmacology - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 746 Imaging Techniques - 922.2 Mathematical Statistics
Numerical data indexing:Percentage 4.00e-01%, Percentage 5.30e+00%, Percentage 5.70e+00%
DOI:10.1007/s11433-021-1730-x
Funding details: Number: 81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by the National Natural Science Foundation of China (Grant No. 81427802). The authors thank Dr. Jila Rafighdoost from Iran for helpful modifications to this manuscript as a native speaker.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20211810282267
Title:Star identification based on multilayer voting algorithm for star sensors????(Open Access)
Authors:Liu, Meiying (1, 2); Wei, Xin (1, 2); Wen, Desheng (1); Wang, Hu (1, 2)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Wei, Xin(weixin@opt.cn)
Source title:Sensors
Abbreviated source title:Sensors
Volume:21
Issue:9
Issue date:May 1, 2021
Publication year:2021
Article number:3084
Language:English
ISSN:14248220
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

This paper describes the multilayer voting algorithm, a novel autonomous star identification method for spacecraft attitude determination. The proposed algorithm includes two processes: an initial match process and a verification process. In the initial match process, a triangle voting scheme is used to acquire candidates of the detected stars, in which the triangle unit is adopted as the basic voting unit. During the identification process, feature extraction is implemented, and each triangle unit is described by its singular values. Then the singular values are used to search for candidates of the imaged triangle units, which further improve the efficiency and robustness of the algorithm. After the initial match step, a verification method is applied to eliminate incorrect candidates from the initial results and then outputting the final match results of the imaged stars. Experiments show that our algorithm has more robustness to position noise, magnitude noise, and false stars than the other three algorithms, the identification speed of our algorithm is largely faster than the geometric voting algorithm and optimized grid algorithm. However, it takes more memory, and SVD also seems faster.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:29
Main heading:Stars
Controlled terms:Image enhancement - Multilayers
Uncontrolled terms:Identification process - Singular values - Spacecraft attitude determination - Star identification - Verification method - Verification process - Voting algorithm - Voting schemes
Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena
DOI:10.3390/s21093084
Funding details: Number: 2015AA7046612, Acronym: -, Sponsor: National High-tech Research and Development Program;
Funding text:Funding: This work was supported by the 863 Program, grant number 2015AA7046612.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20211310131721
Title:Coherent synthetic aperture imaging for visible remote sensing via reflective Fourier ptychography????(Open Access)
Authors:Xiang, Meng (1, 2); Pan, An (1, 2); Zhao, Yiyi (1); Fan, Xuewu (1); Zhao, Hui (1); Li, Chuang (1); Yao, Baoli (1)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Li, Chuang(lichuang@opt.ac.cn)
Source title:Optics Letters
Abbreviated source title:Opt. Lett.
Volume:46
Issue:1
Issue date:January 1, 2021
Publication year:2021
Pages:29-32
Language:English
ISSN:01469592
E-ISSN:15394794
CODEN:OPLEDP
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:Synthetic aperture radar can measure the phase of a microwave with an antenna, which cannot be directly extended to visible light imaging due to phase lost. In this Letter, we report an active remote sensing with visible light via reflective Fourier ptychography, termed coherent synthetic aperture imaging (CSAI), achieving high resolution, a wide field-of-view (FOV), and phase recovery. A proof-of-concept experiment is reported with laser scanning and a collimator for the infinite object. Both smooth and rough objects are tested, and the spatial resolution increased from 15.6 to 3.48 µm with a factor of 4.5. The speckle noise can be suppressed obviously, which is important for coherent imaging. Meanwhile, the CSAI method can tackle the aberration induced from the optical system by one-step deconvolution and shows the potential to replace the adaptive optics for aberration removal of atmospheric turbulence.
© 2020 Optical Society of America
Number of references:30
Main heading:Aberrations
Controlled terms:Adaptive optics - Atmospheric turbulence - Light - Microwave antennas - Optical systems - Remote sensing - Synthetic aperture radar - Synthetic apertures
Uncontrolled terms:Coherent imaging - High resolution - Infinite objects - Phase recovery - Proof of concept - Spatial resolution - Synthetic aperture imaging - Wide field of view
Classification code:443.1 Atmospheric Properties - 716.2 Radar Systems and Equipment - 741.1 Light/Optics - 741.3 Optical Devices and Systems
DOI:10.1364/OL.409258
Funding details: Number: 61975233,81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Funding. Major Project on High Resolution Earth Observation System (GFZX04014307); National Natural Science Foundation of China (61975233, 81427802).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20210109710833
Title:Pixel-wise ordinal classification for salient object grading
Authors:Liu, Yanzhu (1); Wang, Yanan (2); Kong, Adams Wai Kin (1)
Author affiliation:(1) School of Computer Science and Engineering, Nanyang Technological University, 639978, Singapore; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China
Corresponding author:Liu, Yanzhu(yzliu@ntu.edu.sg)
Source title:Image and Vision Computing
Abbreviated source title:Image Vision Comput
Volume:106
Issue date:February 2021
Publication year:2021
Article number:104086
Language:English
ISSN:02628856
CODEN:IVCODK
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:Driven by business intelligence applications for rating attraction of products in shops, a new problem — salient object grading is studied in this paper. In computer vision, plenty of salient object detection approaches have been proposed, while most existing studies detect objects in a binary manner: salient or not. This paper focuses on a new problem setting that requires detecting all salient objects and categorizing them into different salient levels. Based on that, a pixel-wise ordinal classification method is proposed. It consists of a multi-resolution saliency detector which detects and segments objects, an ordinal classifier which grades pixels into different salient levels, and a binary saliency enhancer which sharpens the difference between non-saliency and all other salient levels. Two new image datasets with salient level labels are constructed. Experimental results demonstrate that, on the one hand, the proposed method provides effective salient level predictions and on the other hand, offers very comparable performance with state-of-the-art salient object detection methods in the traditional problem setting.
© 2020 Elsevier B.V.
Number of references:23
Main heading:Object detection
Controlled terms:Grading - Object recognition - Pixels
Uncontrolled terms:Business intelligence applications - Image datasets - Ordinal classification - Salient object detection - Salient objects - State of the art
Classification code:723.2 Data Processing and Image Processing
DOI:10.1016/j.imavis.2020.104086
Funding details: Number: MOE2016-T2-1-042, Acronym: -, Sponsor: -;
Funding text:This work is supported by Ministry of Education , Singapore ( MOE2016-T2-1-042 (S)).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810613327
Title:Unsupervised Feature Selection using Pseudo Label Approximation
Authors:Deng, Ren (1); Liu, Ye (1); Luo, Liyan (1); Chen, DongJing (1); Li, Xijie (2)
Author affiliation:(1) Amazingx Academy, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China
Source title:ACM International Conference Proceeding Series
Abbreviated source title:ACM Int. Conf. Proc. Ser.
Part number:1 of 1
Issue title:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021
Issue date:February 26, 2021
Publication year:2021
Pages:498-502
Article number:3457758
Language:English
ISBN-13:9781450389310
Document type:Conference article (CA)
Conference name:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021
Conference date:February 26, 2021 - March 1, 2021
Conference location:Virtual, Online, China
Conference code:169701
Publisher:Association for Computing Machinery
Abstract:

Feature selection is a machine learning technique that selects a representative subset of all features available in order to reduce the time and space needed to process high-dimensional data. Traditional feature selection methods include filter, wrapper, and embedded approaches. However, many conventional methods' performances are not suitable in many contexts. This paper proposes a new unsupervised feature selection model based on pseudo label approximation. The new derived model incorporates a projection error, a sparsity regularization, and a manifold regularization term that preserves the manifold structure of the original data. Finally, implementation of the new model onto five distinct datasets validates the effectiveness of the proposed model.
© 2021 ACM.
Number of references:14
Main heading:Feature extraction
Controlled terms:Clustering algorithms - Machine learning - Turing machines
Uncontrolled terms:Conventional methods - Feature selection methods - High dimensional data - Machine learning techniques - Manifold regularizations - Manifold structures - Sparsity regularizations - Unsupervised feature selection
Classification code:721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 903.1 Information Sources and Analysis
DOI:10.1145/3457682.3457758

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609884621
Title:Multi-scale joint network based on Retinex theory for low-light enhancement
Authors:Song, Xijuan (1, 2); Huang, Jijiang (1); Cao, Jianzhong (1); Song, Dawei (1, 2)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Huang, Jijiang(huangjijiang@opt.ac.cn)
Source title:Signal, Image and Video Processing
Abbreviated source title:Signal Image Video Process.
Volume:15
Issue:6
Issue date:September 2021
Publication year:2021
Pages:1257-1264
Language:English
ISSN:18631703
E-ISSN:18631711
Document type:Journal article (JA)
Publisher:Springer Science and Business Media Deutschland GmbH
Abstract:

Due to the limitations of devices, images taken in low-light environments are of low contrast and high noise without any manual intervention. Such images will affect the visual experience and hinder further visual processing tasks, such as target detection and target tracking. To alleviate this issue, we propose a multi-scale joint low-light enhancement network based on the Retinex theory. The network consists of a decomposition part and an enhancement part. As a joint network, the decomposition and enhancement parts are mutually constrained, and the parameters are updated at the same time so that the image processing results are more excellent in detail. Our algorithm avoids the separation and recombination of decomposition and enhancement. Therefore, less information is lost in the processing of low-light images, and the enhancement result of the proposed algorithm is very close to the ground truth. In addition, in the enhancement part, we adopt a multi-scale network to fully extract image features. The multi-scale network maintains a balance between the global and local luminance of the illumination image. Retinex theory can effectively solve the problem of noise amplification and color distortion. At the same time, we have added color loss to solve the problem of color distortion, so that the enhancement result is closer to the normal-light image in color. The enhancement results are intuitively excellent, and the peak signal-to-noise ratio and structural similarity index results also reflect the reliability of the algorithm.
© 2021, The Author(s), under exclusive licence to Springer-Verlag London Ltd. part of Springer Nature.
Number of references:33
Main heading:Image enhancement
Controlled terms:Color - Signal to noise ratio - Target tracking
Uncontrolled terms:Color distortions - Illumination images - Manual intervention - Noise amplification - Peak signal to noise ratio - Structural similarity indices - Visual experiences - Visual-processing
Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics
DOI:10.1007/s11760-021-01856-y

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410174167
Title:Single-mode fiber to GRIN-rod lenses coupling efficiency and tolerance analysis
Authors:Song, Wei (1, 2); Xie, Youjin (1); Li, Zhiguo (1); Hao, Wei (1); Yan, Peipie (1); Li, Xin (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11780
Part number:1 of 1
Issue title:Global Intelligent Industry Conference 2020
Issue date:2021
Publication year:2021
Article number:117801E
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643949
Document type:Conference article (CA)
Conference name:Global Intelligent Industry Conference 2020
Conference date:November 20, 2020 - November 21, 2020
Conference location:Guangzhou, China
Conference code:167976
Sponsor:Chinese Society for Optical Engineering
Publisher:SPIE
Abstract:

The single-mode fiber coupling efficiency with graded-index rod lenses can achieve higher coupling efficiency, compared with the direct alignment coupling of the single-mode fiber. The assembly error of direct alignment has a far greater impact on the coupling efficiency of the fiber than the GRIN lenses coupling to fiber. The analysis of the influence of the coupling error on the optical fiber coupling efficiency provides important theoretical support and guidance for processing and assembly. Axial error, radial error and angular tilt will all have different effects on fiber coupling efficiency. However, the fiber coupling system is not only limited to the coupling of the fiber and GRIN lenses, but also can be coupled with one or more lenses to analyze the advantages and disadvantages of multiple coupling methods.
© 2021 SPIE
Number of references:7
Main heading:Optical fiber coupling
Controlled terms:Alignment - Efficiency - Errors - Fibers - Fits and tolerances - Single mode fibers
Uncontrolled terms:Coupling efficiency - Coupling errors - Coupling methods - Different effects - Fiber couplings - Fiber-coupling efficiency - Single-mode-fiber coupling - Tolerance analysis
Classification code:601.1 Mechanical Devices - 741.1.2 Fiber Optics - 913.1 Production Engineering
DOI:10.1117/12.2590659

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213510838944
Title:Design analysis and test verification of a rigid-flexible, dual-mode coupling support structure for space-based rectangular curved prisms
Authors:Jia, Xin-Yin (1, 2); Wang, Fei-Cheng (1); Li, Li-Bo (1); Zhang, Zhao-Hui (1); Liu, Jia (1); Hu, Bing-Liang (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Hu, Bing-Liang(hbl@opt.ac.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:25
Issue date:September 1, 2021
Publication year:2021
Pages:7563-7573
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

In view of the functional requirements of high reliability and stability support of optical components of space remote sensors, a rigid-flexible, dual-mode coupling support structure for space-based rectangular curved prisms (SRCPs) was designed. In-depth studies of the support principle and engineering realization of theSRCPs and optimization of the flexible adhesive structure were performed. Static and dynamic simulations were conducted on the mirror subassembly by means of finite element analysis, and test verification was also performed. The tests revealed that the surface shape error of the mirror subassembly after mechanical testing was 0.021λ, the displacement of the mirror body was 0.008 mm, the inclination angle was∼0.8'', the mass of the mirror subassembly was 4.79 kg, the fundamental frequency was 283 Hz, and the maximum amplification of the total rms acceleration was 4.37. All indexes were superior to those of the design requirements. On this basis, bonding tests and mechanical tests of a rectangular curved prism reflector, a rectangular curved prism, and a rectangular plane reflector employing this proposed support structure were continued. The test results verified the reliability, stability, and universal applicability of the proposed rigid-flexible, dual-mode peripheral bonding support structure.
© 2021 Optical Society of America.
Number of references:19
Main heading:Optical testing
Controlled terms:Adhesives - Ground supports - Mechanical testing - Mirrors - Prisms - Reflection - Remote sensing - Rigid structures
Uncontrolled terms:Engineering realizations - Functional requirement - Fundamental frequencies - Inclination angles - Optical components - Space remote sensors - Support structures - Surface shape error
Classification code:408 Structural Design - 741.3 Optical Devices and Systems - 943.2 Mechanical Variables Measurements
Numerical data indexing:Frequency 2.83e+02Hz, Mass 4.79e+00kg, Size 8.00e-06m
DOI:10.1364/AO.431394

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213410814836
Title:Influence of spectral characteristics of light sources on measuring space camera modulation transfer function????(Open Access)
Title of translation:光源光谱特性对空间相机调制传递函数检测的影响????(Open Access)
Authors:Liu, Shang-Kuo (1, 2); Wang, Tao (1); Li, Kun (1); Cao, Kun (1); Zhang, Xi-Bin (1); Zhou, Yan (1); Zhao, Jian-Ke (1); Yao, Bao-Li (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Liu, Shang-Kuo(liushangkuo@opt.ac.cn)
Source title:Wuli Xuebao/Acta Physica Sinica
Abbreviated source title:Wuli Xuebao
Volume:70
Issue:13
Issue date:July 5, 2021
Publication year:2021
Article number:134208
Language:Chinese
ISSN:10003290
CODEN:WLHPAR
Document type:Journal article (JA)
Publisher:Institute of Physics, Chinese Academy of Sciences
Abstract:

Modulation transfer function (MTF) measurement is a major means to evaluate the imaging quality of a space camera. The influence caused by the spectral characteristic of light source on the MTF results is not negligible, because the transmittance and color aberration of optical systems, and quantum efficiency of the space camera detectors are all spectrally related. Thus, MTF results tested by different light sources are different from each other. To address this problem, we propose a method to analyze the influence of spectral characteristics of light sources on measuring the MTF of space cameras. In addition, the devices and methods are designed to calibrate the spectral response and monochrome point spread function (PSF) of space camera. A Sigma lens (focal length: 1000mm, F number: 5.6) and a Cannon EOS 5DSR camera (pixel size: 4.14 μm) are combined into an experimental space camera, whose spectral response is calibrated with a monochromator (Omno30300, NBeT) and a spectral radiometer (FieldSpec, ASD). We calibrate the monochrome PSF of the Sigma lens with the same monochromator and a CCD (PIXIS 1024, Princeton Instruments, pixel size: 13 μm) micro-measuring system (20X objective). During the calibration of spectral response and monochrome PSF, the same collimator (focus: 5000 mm, F number: 10) is used. With using the proposed method and those calibrating data, we compute the theoretical values of the MTF of a space camera measured separately with five different light sources. The results indicate that MTF measured by a xenon lamp is greatly different from those MTFs measured by the other four light sources. Comparisons of those theoretically calculated MTFs, separately, show that the MTF measured by a tungsten halogen lamp is greater than the MTF measured by a xenon lamp at each spatial frequency. The deviation between those two lamps reaches a maximum value of 0.075 in the medium-high frequency zone. Furthermore, in order to verify those theoretical conclusions, a platform including a collimator and the previous space camera is constructed. The MTFs measured by a tungsten halogen lamp and a xenon lamp are computed with the slanted-edge method respectively. The results demonstrate that the distributions and deviations of the MTFs tested by those two lamps are identical to those theoretical results at each spatial frequency, with the maximum deviation being 0.057. The theoretical and experimental results demonstrate that the suggested method can accurately calculate the influence of spectral characteristics of light sources on measuring MTF of space cameras. The proposed method can also be adopted to investigate the influence of spectral characteristics of light sources on MTF of optical systems in the design or test stages.
© 2021 Chinese Physical Society.
Number of references:25
Main heading:Optical transfer function
Controlled terms:Arc lamps - Cameras - Modulation - Monochromators - Optical collimators - Optical systems - Pixels - Tungsten - Xenon
Uncontrolled terms:High frequency HF - Modulation transfer function measurements - Slanted-edge method - Spectral characteristics - Spectral radiometers - Spectral response - Theoretical values - Tungsten halogen lamp
Classification code:543.5 Tungsten and Alloys - 707.2 Electric Lamps - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 804 Chemical Products Generally
Numerical data indexing:Size 1.00e+00m, Size 1.30e-05m, Size 4.14e-06m, Size 5.00e+00m
DOI:10.7498/aps.70.20201575

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211310150442
Title:Simulation and analysis of atmospheric scattering in stray light testing for point source transmittance
Authors:Ma, Zhanpeng (1, 2); Chen, Qinfang (1); Wang, Hu (1, 2)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Chen, Qinfang(cqf2009@opt.ac.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:2
Issue date:January 10, 2021
Publication year:2021
Pages:232-238
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:We propose a full-band model to quantitatively calculate terrestrial atmospheric scattering in stray light testing based on the Monte Carlo algorithm. Measurements are conducted using two classifications of air cleanliness at off-axis angles from 35◦ to 90◦. Corresponding simulations of Mie scattering and Rayleigh scattering are used for a comparison with the measured values. The relative root mean square deviation of the simulation from the measurement result is 3.72% and 24.1% for Mie scattering and Rayleigh scattering, respectively. This exhibits excellent agreement between the measured and predicted values for a 26◦ full-angle baffle when illuminated by a 550 mm diameter collimated beam.
© 2021 Optical Society of America
Number of references:26
Main heading:Stray light
Controlled terms:Brillouin scattering - Rayleigh scattering
Uncontrolled terms:Atmospheric scattering - Collimated beams - Measured values - Monte carlo algorithms - Off-axis angles - Root mean square deviations - Simulation and analysis - Stray light testing
Classification code:711 Electromagnetic Waves - 741.1 Light/Optics
Numerical data indexing:Percentage 2.41e+01%, Percentage 3.72e+00%, Size 5.50e-01m
DOI:10.1364/AO.409656
Funding details: Number: 11803075, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (11803075).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210809975869
Title:Techniques for On-orbit Calibration of Space Optical Imaging Systems Based on Auto-collimation
Title of translation:基于自准直原理的空间光学成像系统在轨几何定标技术
Authors:Zhao, Hengxiang (1, 2); Li, Libo (1); Feng, Yutao (1); Li, Yong (1); Liu, Wei (3); Wu, Junqiang (1); Yan, Peng (1); Bai, Qinglan (1)
Author affiliation:(1) Xi'an Institute of Optics Precision Mechanic of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an Research Institute of Surveying and Mapping, Xi'an; 710054, China
Corresponding author:Feng, Yutao(fytciom@126.com)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:1
Issue date:January 25, 2021
Publication year:2021
Article number:0112003
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:Through the analysis of imaging principle, simulation of optical model and construction of the principle prototype, the main factors affecting the calibration accuracy of the autocollimation calibration system in the experimental environment are discussed, and the main issues of the calibration system are put forward, which should be noticed in the design and work, including pixel size selection, image point location algorithm, focus amount calculation and system installation error. According to the analysis results, the calibration error of the principle prototype is corrected. Finally, the calibration accuracy of the principle prototype is less than 0.4 mm, and the calibration accuracy of the rotation in X, Y and Z directions are less than 0.6", 0.6" and 12" respectively. The relative error of accuracy is better than 0.2%.
© 2021, Science Press. All right reserved.
Number of references:18
Main heading:Calibration
Controlled terms:Errors - Ion beams
Uncontrolled terms:Calibration accuracy - Calibration error - Calibration system - Experimental environment - Imaging principle - On-orbit calibration - Optical imaging system - System installation
Classification code:932.1 High Energy Physics
Numerical data indexing:Percentage 2.00e-01%, Size 4.00e-04m
DOI:10.3788/gzxb20215001.0112003
Funding details: Number: 2019JQ-931, Acronym: -, Sponsor: -;Number: 41005019, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB 2016A07, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:Foundation item：National Natural Science Foundation of China（No. 41005019），Fund for Young Scientists from West Academy of Sciences（No. XAB 2016A07），Natural Science Basic Research Program of Shannxi China（No. 2019JQ-931）National Natural Science Foundation of China (No. 41005019), Fund for Young Scientists from West China, Chinese Academy of Sciences (No. XAB 2016A07), Natural Science Basic Research Program of Shannxi China (No. 2019JQ-931).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010359826
Title:Hyperspectral Anomaly Detection Based on 3D Convolutional Autoencoder and Low Rank Representation
Title of translation:基于3D卷积自编解码器和低秩表示的高光谱异常检测
Authors:Sun, Bangyong (1, 2); Zhao, Zhe (1); Hu, Bingliang (2); Yu, Tao (2)
Author affiliation:(1) College of Printing, Packaging and Digital Media, Xi'an University of Technology, Xi'an; 710048, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Yu, Tao(yutao@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:4
Issue date:April 25, 2021
Publication year:2021
Article number:0410003
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

Due to the challenge of high dimensionality, insufficient utilization of spatial-spectral information and limited local structure property expression in hyperspectral images, a hyperspectral anomaly detection algorithm based on 3D convolutional autoencoder and low rank representation is proposed in this paper. Firstly, the spectral-spatial features of hyperspectral images are extracted by 3D convolutional autoencoder. In order to precisely represent the local similarity, a new loss function is proposed to constrain the central pixel and it's surrounding pixels to extract more discriminative features. And then, the Density Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm is used to construct the background dictionary, and the abnormal region is separated by low rank representation on the feature map. Finally, the detection result is obtained by fusing the reconstruction error obtained by 3D convolution autoencoder and abnormal region detection result. We carry out objective and subjective anomaly detection experiments on two real hyperspectral datasets. The results demonstrate that the proposed algorithm detect abnormal targets more accurately compared with other algorithms.
© 2021, Science Press. All right reserved.
Number of references:32
Main heading:Anomaly detection
Controlled terms:Clustering algorithms - Convolution - Learning systems - Pixels - Spectroscopy
Uncontrolled terms:Density-based spatial clustering of applications with noise - Detection experiments - Discriminative features - High dimensionality - Hyperspectral anomaly detection - Low-rank representations - Reconstruction error - Spectral information
Classification code:716.1 Information Theory and Signal Processing - 903.1 Information Sources and Analysis
DOI:10.3788/gzxb20215004.0410003
Funding details: Number: 2019M653784, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: 62076199, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (No.62076199), National Defense Science and Technology Innovation Special Zone Project (No.XXX-ZT-00X-014-01), China Postdoctoral Science Foundation (No. 2019M653784), Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences (No.LSIT201801D).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204509461729
Title:Small Moving Target Recognition in Star Image with TRM
Authors:Du, Yun (1, 2, 3); Wen, Desheng (1); Liu, Guizhong (2); Qiu, Shi (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Du, Yun(duyun@opt.ac.cnemailqiushi215@163.com)Qiu, Shi(qiushi215@163.com)
Source title:International Journal of Pattern Recognition and Artificial Intelligence
Abbreviated source title:Int J Pattern Recognit Artif Intell
Volume:35
Issue:2
Issue date:February 2021
Publication year:2021
Article number:2150004
Language:English
ISSN:02180014
CODEN:IJPIEI
Document type:Journal article (JA)
Publisher:World Scientific
Abstract:Recognition of small moving targets in space has become one of the frontier scientific researches in recent decade. Most of them focus on detection and recognition in star image with sidereal stare mode. However, in this research field, few researches are about detection and recognition in star image with track rate mode. In this paper, a novel approach is proposed to recognize the moving target in single frame by machine learning method based on elliptical characteristic extraction of star points. The technical path about recognition of moving target in space is redesigned instead of traditional processing approaches. Elliptical characteristics of each star point can be successfully extracted from single image. Machine learning can achieve the classification goal in order to make sure that all moving targets can be extracted. The experiments show that our proposed approach can have better performance in star images with different qualities.
© 2021 World Scientific Publishing Company.
Number of references:47
Main heading:Stars
Controlled terms:Machine learning
Uncontrolled terms:Characteristic extraction - Machine learning methods - Moving targets - Research fields - Scientific researches - Single frames - Small moving target - Traditional processing
Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena
DOI:10.1142/S021800142150004X

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210309771358
Title:Smart Optic Fiber Mattress for Animal Sleep Continuous Monitoring Based Multi-Modal Interferometer
Authors:Li, Yang (1); Dong, Bo (1); Zhao, Yudi (2); Chen, Enqing (2); Wang, Xiaoli (2); Zhao, Wei (1); Wang, Yishan (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China
Corresponding author:Dong, Bo(bdong@opt.ac.cn)
Source title:Journal of Lightwave Technology
Abbreviated source title:J Lightwave Technol
Volume:39
Issue:12
Issue date:June 15, 2021
Publication year:2021
Pages:4131-4137
Article number:9314182
Language:English
ISSN:07338724
E-ISSN:15582213
CODEN:JLTEDG
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

A smart optic fiber mattress for animal sleep continuous monitoring based on a multi-modal interferometer is presented. The sensor is fabricated by splicing two single mode fibers (SMFs) and a multimode fiber (MMF) with a grid structure. Due to the network structure of the sensor, it has wider contact surface for monitoring vital signs and reduces the detection difficulty caused by the change of measured object position. The sensing unit can be placed under the dog mattress. Experimental results show that it can continuously monitor the sleeping activities and respiration of the dog. The detected information includes activity rhythm, sleeping state and sleeping respiratory rates (SRR). This technique avoids some potential problems such as injuring caused by the sensor appendage and dispute caused by moral principles. It is qualified to be widely used in health care of pets and protection of wildlife.
© 1983-2012 IEEE.
Number of references:17
Main heading:Sleep research
Controlled terms:Animals - Fibers - Interferometers - Monitoring - Multimode fibers - Single mode fibers
Uncontrolled terms:Contact surface - Continuous monitoring - Grid structures - Multi-mode fibers (MMF) - Network structures - Object positions - Potential problems - Respiratory rate
Classification code:461.4 Ergonomics and Human Factors Engineering - 741.1.2 Fiber Optics - 941.3 Optical Instruments
DOI:10.1109/JLT.2020.3048958

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310141478
Title:Frontiers in science and applications for attosecond light source????(Open Access)
Title of translation:阿秒光源前沿科学与应用????(Open Access)
Authors:Fu, Yuxi (1, 2)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Fu, Yuxi(fuyuxi@opt.ac.cn)
Source title:Kexue Tongbao/Chinese Science Bulletin
Abbreviated source title:Kexue Tongbao/Chin. Sc. Bull.
Volume:66
Issue:8
Issue date:March 15, 2021
Publication year:2021
Pages:833-834
Language:Chinese
ISSN:0023074X
E-ISSN:20959419
Document type:Journal article (JA)
Publisher:Chinese Academy of Sciences
Number of references:14
DOI:10.1360/TB-2020-1672

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20202608862729
Title:Heart-Rate Monitoring with an Ethyl Alpha-Cyanoacrylate Based Fiber Fabry-Perot Sensor
Authors:Li, Yang (1); Dong, Bo (1); Chen, Enqing (2); Wang, Xiaoli (2); Zhao, Yudi (2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China
Corresponding author:Dong, Bo(bdong@opt.ac.cn)
Source title:IEEE Journal of Selected Topics in Quantum Electronics
Abbreviated source title:IEEE J Sel Top Quantum Electron
Volume:27
Issue:4
Issue date:July-August 2021
Publication year:2021
Article number:9115895
Language:English
ISSN:1077260X
E-ISSN:15584542
CODEN:IJSQEN
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc., United States
Abstract:Heart-rate monitoring with an ethyl alpha-cyanoacrylate (EtCNA) based fiber Fabry-Perot (F-P) sensor is presented. The fiber F-P sensor is fixed in a capillary tube by using the EtCNA binder. Due to the lower Young's modulus of the EtCNA, the sensor can detect low frequency vibration with a high sensitivity. The fiber sensor is attached in a specially designed bracket to obtain the stable data. When the sensor with bracket is put on the human body, the heart-rate can be monitored accurately by monitoring the laser intensity variation induced by the heartbeat. Experimental results show that the sensor has the strain sensitivity of 2.57 pm/μN with good responses to low frequency vibrations of 1 Hz, 2 Hz and 3 Hz. The maximum and the minimum mean square deviations of the volunteers' data are 4.434210 and 0.667499, respectively. Moreover, it has good adaptability to measure the heart-rate on different positions of human body, such as wrist, chest and neck. Due to the advantages of small size, low cost, good adaptability, pollution-free and no harm to body. Our proposed sensor is expected to be widely used in heart disease monitoring.
© 1995-2012 IEEE.
Number of references:39
Main heading:Heart
Controlled terms:Fabry-Perot interferometers - Fiber optic sensors - Fibers - Patient monitoring
Uncontrolled terms:Fiber Fabry-Perot - Fiber Fabry-Perot sensor - Heart-rate monitoring - High sensitivity - Laser intensities - Low-frequency vibration - Minimum mean squares - Strain sensitivity
Classification code:461.2 Biological Materials and Tissue Engineering - 461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics - 941.3 Optical Instruments
Numerical data indexing:Frequency 1.00e+00Hz, Frequency 2.00e+00Hz, Frequency 3.00e+00Hz
DOI:10.1109/JSTQE.2020.3002084
Funding details: Number: Y829321213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:Manuscript received April 13, 2020; revised June 3, 2020; accepted June 8, 2020. Date of publication June 12, 2020; date of current version July 14, 2020. This work is supported in part by the CAS Pioneer Hundred Talents Program Y829321213. (Corresponding author: Bo Dong.) Yang Li is with the State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: liyang185@mails.ucas.ac.cn).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:6285223
Title:Remote Sensing Image Generation from Audio
Authors:Zheng, Zhiyuan (1, 2); Chen, Jun (1); Zheng, Xiangtao (2); Lu, Xiaoqiang (2)
Author affiliation:(1) National Engineering Research Center for Multimedia Software, School of Computer Science, Wuhan University, Wuhan; 430072, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)
Source title:IEEE Geoscience and Remote Sensing Letters
Abbreviated source title:IEEE Geosci. Remote Sens. Lett.
Volume:18
Issue:6
Issue date:June 2021
Publication year:2021
Pages:994-998
Article number:9094059
Language:English
ISSN:1545598X
E-ISSN:15580571
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Generating image from other modal data has attracted much attention in cross-modal studies, since the generated image offers intuitive vision information. Unlike the previous works which generate an image from text, a novel task is introduced, generating an image from audio. However, semantic gap intrinsically exists in cross-modal data, which disturbs the generative results. In order to explore the relevance between the audio and image, a novel reranking audio-image translation method is proposed. The proposed method: 1) maps the audio and image into a uniform feature space; 2) designs an audio-audio matching network to match the related audio; and 3) adopts an audio-image matching network for every matched audio to generate a related image, and the most frequent image is voted as the final result. Extensive experiments on two remote sensing cross-modal data sets demonstrate that the proposed method can visualize the content of audio.
© 2004-2012 IEEE.
Number of references:16
Controlled terms:cross section - experimental study - image analysis - remote sensing - satellite imagery
Classification code:71.8.5.4 Remote sensing: numerical and image analysis
DOI:10.1109/LGRS.2020.2992324
Funding details: Number: 2017YFB0502900, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 61772510, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 61806193, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 61876135, Acronym: -, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61772510, and Grant 61876135, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, and in part by the CAS "Light of West China" Program under Grant XAB2017B26.

 

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509874589
Title:Testing of annular hyperboloid mirror for Cassegrain system
Authors:Hao, Sanfeng (1, 2); Zhang, Jian (2, 3); An, Fei (2); Yang, Jianfeng (2)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Mechanoelectronic Engineering, Xidian University, Xi'an; 710071, China
Corresponding author:Zhang, Jian(zj@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:117611Z
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:This paper introduces the testing of annular hyperboloid mirror with 460mm diameter in the Cassegrain system. To improve the testing efficiency and meet the requirements of utilization, the study is carried out from three stages: precision grinding, precision polishing, and optical coating. In the precision grinding stage, the annular Zernike polynomial is used to fit the measured surface combining with the data measured from the coordinate measuring machine, so that it can facilitate the testing of the distribution of the surface shape deviation over the entire surface. During the precision polishing stage, a feasible Offner compensator is designed to achieve the goal of high-precision testing of the hyperboloid surface, with a measurement accuracy of RMS≤0.02λ. Also, 0.5-0.7μm and 3-5μm dual-band high reflectivity and high uniformity reflective coating is designed for the Cassegrain system requirements, the actual test reflectivity is 96.2%, which can meet the design requirements.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:15
Main heading:Optical testing
Controlled terms:Grinding (machining) - Mirrors - Optical coatings - Photonics - Polishing - Reflection - Reflective coatings - Surface testing
Uncontrolled terms:High reflectivity - Hyperboloid mirrors - Measurement accuracy - Precision grinding - Precision polishing - System requirements - Testing efficiency - Zernike polynomials
Classification code:604.2 Machining Operations - 741.3 Optical Devices and Systems - 813.2 Coating Materials
Numerical data indexing:Percentage 9.62e+01%, Size 3.00e-06m to 5.00e-06m, Size 4.60e-01m, Size 5.00e-07m to 7.00e-07m
DOI:10.1117/12.2585089

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310141835
Title:Development and prospect on driving laser for attosecond pulse????(Open Access)
Title of translation:阿秒脉冲驱动激光发展现状及展望????(Open Access)
Authors:Yuan, Hao (1, 2); Cao, Huabao (1); Wang, Hushan (1); Liu, Xin (1, 2); Sun, Xianwei (1); Wang, Yishan (1); Zhao, Wei (1); Fu, Yuxi (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Wang, Yishan(yswang@opt.ac.cnemailweiz@opt.ac.cnemailfuyuxi@opt.ac.cn)Zhao, Wei(weiz@opt.ac.cnemailfuyuxi@opt.ac.cn)Fu, Yuxi(fuyuxi@opt.ac.cn)
Source title:Kexue Tongbao/Chinese Science Bulletin
Abbreviated source title:Kexue Tongbao/Chin. Sc. Bull.
Volume:66
Issue:8
Issue date:March 15, 2021
Publication year:2021
Pages:878-888
Language:Chinese
ISSN:0023074X
E-ISSN:20959419
Document type:Journal article (JA)
Publisher:Chinese Academy of Sciences
Abstract:Attosecond light source is a new type of light source that was born at the beginning of the 21st century, which has a short pulse, broad spectrum, high temporal and spatial coherence and wide tunability, thus being widely employed in various research fieds. From ultrafast motion of electrons in atoms to charge transfer in biological macromolecules, attosecond pulses is currently the only tool that can track and capture these ultrafast dynamics. Attosecond pulse enables us to investigate ultrafast dynamics of micro-world both in nanometer and attosecond scales. However, the mechanism of attosecond pulse generation is completely different from general ultrafast lasers. Instead, attosecond pulse is generated by a highly nonlinear interaction between strong ultrafast femtosecond laser and matter, which is called high-order harmonic generation (HHG). The mechanism of HHG can be understood by a classical three step model. First, an electron is ionized from an atom by a strong laser electric field through tunnel ionization. Then the free electron is accelerated by the laser field and gains energy. Finally, the electron recombines with the parent ion when the laser field changes its sign with emission of a photon, whose energy equals its kinetic energy gained in the laser field plus ionization potential of the atom. Apparently, HHG is strongly affected by the laser waveform. Several key parameters of driving laser, such as wavelength, intensity, and carrier envelope phase strongly affect the process of HHG. Thus, the characteristics of attosecond pulses are determined by the driving laser. The rapid development of attosecond pulse technology strongly depends on the development of driving laser technology. In the beginning, chirped pulse amplification (CPA) technology greatly promoted the development of attosecond light sources. The femtosecond CPA systems based on Ti: sapphire crystal has been the main driving laser to generate attosecond light pulses. The driving laser wavelength is in the near infrared region near 800 nm, which generally has a pulse duration of multiple optical cycles. By employing post-compression technology to shorten pulse durations of CPA systems to few-cycle, isolated attosecond pulses in the extreme ultraviolet (XUV) can be generated, which is called the first generation of attosecond light source. Recently, optical parametric amplification (OPA) systems have been widely used as driving laser due to its flexible wavelength tunability. Using OPA, longer driving laser wavelength up to the midinfrared (MIR) can be obtained, which pushes the attosecond pulses to the soft X-ray region, and has been called the second generation of attosecond light sources. Due to broad spectrum and higher photon energy, attosecond pulses have a shorter duration in the soft X-ray region compared with XUV region, given that the temporal chirp is properly compensated. In 2017, reseachers generated soft X-ray isolated attosecond pulses, which was driven by mid-infrared pulses centered at 1.8 µm. These attosecond pulses, whose duration reaches 53 as and spectrum surpasses carbon K-edge, provide a tool for studying the ultrafast dynamics of diamond, graphene and other carbon materials. In this paper, we start with the principle of attosecond pulses generation based on HHG. Then, we introduce different technologies and their development for obtaining driving laser pulses for HHG. Finally, we introduce prospect on development of driving laser pulses for attosecond pulses generation.
© 2021, Science Press. All right reserved.
Number of references:80
Main heading:Optical parametric amplifiers
Controlled terms:Atom lasers - Atoms - Carbon - Charge transfer - Electric fields - Electrons - Femtosecond lasers - Infrared devices - Ionization potential - Kinetic energy - Kinetics - Photoionization - Photons - Plasma diagnostics - Sapphire - Ultrashort pulses - X rays
Uncontrolled terms:Attosecond light pulse - Attosecond pulse generation - Biological macromolecule - Carrier-envelope phase - Chirped pulse amplifications - High order harmonic generation - Isolated attosecond pulse - Optical parametric amplification
Classification code:482.2.1 Gems - 701.1 Electricity: Basic Concepts and Phenomena - 714 Electronic Components and Tubes - 744.1 Lasers, General - 802.2 Chemical Reactions - 804 Chemical Products Generally - 931 Classical Physics; Quantum Theory; Relativity - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics - 932.3 Plasma Physics
Numerical data indexing:Size 8.00e-07m
DOI:10.1360/TB-2020-0594

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20210509874581
Title:Research of robotic spherical polishing end effector based on finite element simulation
Authors:Mu, Ruixin (1, 2); Zhang, Jian (2, 3)
Author affiliation:(1) Xi'an Institute of Optical and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China; (3) School of Mechanoelectronic Engineering, Xidian University, Xi'an; 710071, China
Corresponding author:Zhang, Jian(zj@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:117611R
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:In this paper, using Preston hypothesis and CCOS removal model, analyzing removal function of the spherical polishing end is analyzed as Gaussian distribution, four schemes are proposed to design the robot optical spherical polishing end effector. Through the analysis and comparison of advantages and disadvantages, an optimal solution is obtained and a standardized design is carried out to realize the synthesis of revolution and rotation of the spherical polishing wheel. The design of the spherical polishing tool adopts bevel gear transmission, belt transmission and planetary gear structure. When the motor input is 200r/min, by adjusting the specifications of the pulley, the spherical polishing wheel can achieve a revolution speed of 60r/min and a rotation speed of 100∼400r/min. After the design is completed, finite element analysis is performed on the important parts of the structure, and the designed structure meets the strength requirements.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:15
Main heading:Finite element method
Controlled terms:Bevel gears - End effectors - Epicyclic gears - Machine design - Photonics - Polishing - Robotics - Spheres - Structural design - Transmissions - Wheels
Uncontrolled terms:Belt transmissions - Finite element simulations - Gear transmissions - Optimal solutions - Polishing wheels - Removal function - Revolution and rotations - Revolution speed
Classification code:408.1 Structural Design, General - 601 Mechanical Design - 601.2 Machine Components - 602.2 Mechanical Transmissions - 604.2 Machining Operations - 731.5 Robotics - 741.1 Light/Optics - 921.6 Numerical Methods
Numerical data indexing:Rotational_Speed 2.00e+02RPM, Rotational_Speed 6.00e+01RPM
DOI:10.1117/12.2584956

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110707126
Title:Design of Spatial Resolution PDV Probe Based on Double Telecentric Lens
Title of translation:基于双远心镜头的空间分辨PDV探头研制
Authors:Yang, Jun (1, 2, 3); Yan, Yadong (1); Li, Qi (1); Shi, Guokai (3); Wang, Zhao (3); Zhang, Yang (3); Zhang, Suoqi (3); He, Junhua (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Laboratory of Intense Dynamic Loading and Effect, Xi'an; 710024, China
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:7
Issue date:July 25, 2021
Publication year:2021
Article number:0712002
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

In order to simultaneously measure the multi-point velocity of a plane target in the range of 5 mm in material dynamics experiments or structural response research, a laser transmitting and receiving probe with spatial resolution for photonic Doppler velocimetry is developed based on the dense fiber array and double telecentric lens. The optical design and structural design are described, and the installation and testing of the probe are performed. The test results of output spot characteristics show that the vertical axis magnification of the probe is consistent with the design value. The minimum diameter of the spot at the focusing position is 109 μm and the maximum is 202 μm. The test results of the receiving efficiency of the probe to the diffuse reflection target show that each fiber in the probe is not crosstalk, and the receiving efficiency of the fiber near the center is large, while that of the two sides is small.
© 2021, Science Press. All right reserved.
Number of references:20
Main heading:Probes
Controlled terms:Efficiency - Image resolution - Optical design
Uncontrolled terms:Design value - Diffuse reflection targets - Minimum diameters - Multi-point velocity - Photonic doppler velocimetry - Spatial resolution - Structural response - Vertical axis
Classification code:741.1 Light/Optics - 913.1 Production Engineering
Numerical data indexing:Size 1.09e-04m, Size 2.02e-04m, Size 5.00e-03m
DOI:10.3788/gzxb20215007.0712002
Funding details: Number: 2017YFA0403300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:National Key Research and Development Program of China (No. 2017YFA0403300)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211010037996
Title:Fabrication and experimental characterization of precise high-efficiency 2D multi-mode fiber array coupler
Authors:Zhou, Xiaojun (1); Song, Aiguo (1); Kong, Depeng (2); Yu, Weixing (2)
Author affiliation:(1) School of Instrument Science and Engineering, Southeast University, Nanjing; 210000, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shanxi Province; 710119, China
Corresponding author:Song, Aiguo(a.g.song@seu.edu.cn)
Source title:Optical Fiber Technology
Abbreviated source title:Opt. Fiber Technol.
Volume:63
Issue date:May 2021
Publication year:2021
Article number:102488
Language:English
ISSN:10685200
CODEN:OFTEFV
Document type:Journal article (JA)
Publisher:Academic Press Inc.
Abstract:In this paper a method for fabricating precise high-efficiency 2D multi-mode fiber array coupler is proposed, and the coupler's performance is experimentally characterized. By improving the design of 2D fiber array coupler, the average concentricity error of the fiber array is down to 0.9 μm. After coupling with microlens array, the average coupling efficiency of the coupler is up to 57.51%. It is demonstrated that the precise microhole position and fiber cladding diameter, supported by microlens array, can provide an excellent coupling performance. This 2D fiber array coupler can be widely applied in LIDAR, optical communication systems and microwave photonics systems, provide the functions of high-speed image capture, interconnection and optical signals time-space transformation.
© 2021 Elsevier Inc.
Number of references:14
Main heading:Optical fiber communication
Controlled terms:Efficiency - Fabrication - Fibers - Image communication systems - Microlenses - Optical instrument lenses - Optical radar
Uncontrolled terms:Coupling efficiency - Coupling performance - Experimental characterization - Fiber claddings - High speed image - High-efficiency - Micro-lens arrays - Microwave Photonics
Classification code:717.1 Optical Communication Systems - 741.3 Optical Devices and Systems - 913.1 Production Engineering
Numerical data indexing:Percentage 5.75e+01%, Size 9.00e-07m
DOI:10.1016/j.yofte.2021.102488
Funding details: Number: 2018YFB0504503, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:This research has been supported by the China National Key Research and Development Project (Grant No. 2018YFB0504503 ).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910318384
Title:Modeling of high-speed laser photography system for field projectile testing
Authors:Sun, Ce (1); Jia, Yangyu (2); Wang, Danni (3)
Author affiliation:(1) Laboratory of Precision Physical Quantity Measurement, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Xi'an Modern Control Technology Research Institute, Xi'an; Shaanxi; 710065, China; (3) Changchun University of Science and Technology, China
Corresponding author:Sun, Ce(sunce@opt.ac.cn)
Source title:Optik
Abbreviated source title:Optik
Volume:241
Issue date:September 2021
Publication year:2021
Article number:166980
Language:English
ISSN:00304026
Document type:Journal article (JA)
Publisher:Elsevier GmbH
Abstract:

Field projectile testing plays a crucial role in national defense. Laser high-speed photography records transient processes with high temporal and spatial resolution and is an effective diagnostic method for range testing. In this study, a laser high-speed photography model is established from detailed aspects, including laser pulse energy for reflective imaging, accurate synchronization of pulse train and shutter signal, minimum exposure time and shooting frequency for targets with different velocities, and magnification correction used in the image measurement. Shooting experiments conducted in Nanshan Test center verify the correctness of the theoretical analysis and parameter selection. The models and methods described in this article can be a guidance for field testing.
© 2021 Elsevier GmbH
Number of references:17
Main heading:High speed photography
Controlled terms:High speed cameras - Lasers - Projectiles - Speed
Uncontrolled terms:Field testing - High spatial resolution - High speed laser - High temporal resolution - Highspeed photography - Illumination energy - Laser high-speed photography - Magnification correction - National defence - Transient process
Classification code:742.1 Photography - 742.2 Photographic Equipment - 744.1 Lasers, General
DOI:10.1016/j.ijleo.2021.166980
Funding details: Number: 2020JQ-438, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:This wok was supported by the Natural Science Basic Research Program of Shaanxi Province (No. 2020JQ-438 ).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110716058
Title:High-accuracy twist measurement based on the spherical wave Talbot effect for a bi-grid modulation collimator
Authors:Liu, Shengrun (1, 2); Xue, Bin (1); Cheng, Ying (1); Yang, Jianfeng (1)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xinxi Road, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Yuquan Road, Beijing; 100049, China
Corresponding author:Liu, Shengrun(liushengrun2015@opt.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:22
Issue date:August 1, 2021
Publication year:2021
Pages:6547-6553
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

The bi-grid modulation collimator is a significant way for imaging solar flares in hard x rays. It implements many subcollimators that consist of separated grid pairs (so-called front grid and rear grid) whose line orientations are parallel. However, when the twist of the front grid with respect to the other will be induced during testing of the bi-grid modulation collimator in the ground verification phase, the line orientation of the grid pairs are no longer parallel. Knowledge of the relative twist between the rear grid and the front grid is very helpful in improving the imaging quality of the bi-grid collimator. However, because of the wide spacing between grid pairs and the requirement of high measurement accuracy, it is a challenge to measure the relative twist. To meet this demand, a method based on the spherical wave Talbot effect is proposed. The Talbot images of the front grid and the rear grid are imaged on the same plane, respectively, through two proper spherical waves. The relative twist can be figured out through the angle between the stripes in the Talbot images of the front grid and the rear grid. In experiments, the measurement accuracy of the relative twist angle can reach 9 arcsec in the range of 370 arcsec. It demonstrates that this method can effectively measure the relative twist between the grid pairs with very high accuracy.
© 2021 Optical Society of America
Number of references:28
Main heading:Spheres
Controlled terms:Contour measurement - Diffraction gratings - Modulation - X rays
Uncontrolled terms:High-accuracy - Imaging quality - Measurement accuracy - Measurement-based - Modulation collimator - Spherical waves - Talbot effects - Twist angles
Classification code:741.3 Optical Devices and Systems - 932.1 High Energy Physics
DOI:10.1364/AO.429980

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:6288229
Title:Synthesized soliton crystals
Authors:Lu, Zhizhou (1); Chen, Hao-Jing (2); Wang, Weiqiang (1, 3); Yao, Lu (2); Wang, Yang (1, 3); Yu, Yan (2); Little, B.E. (1, 3); Chu, S.T. (4); Gong, Qihuang (2, 5, 6); Zhao, Wei (1, 3); Yi, Xu (7, 8); Xiao, Yun-Feng (2, 5, 6); Zhang, Wenfu (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China; (2) State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, China; (3) University of Chinese Academy of Sciences, Beijing, China; (4) Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong; (5) Collaborative Innovation Center of Quantum Matter, Beijing, China; (6) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, China; (7) Department of Electrical and Computer Engineering, University of Virginia, Charlottesville; VA, United States; (8) Department of Physics, University of Virginia, Charlottesville; VA, United States
Corresponding author:Zhang, Wenfu(wfuzhang@opt.ac.cnemailyfxiao@pku.edu.cn)Xiao, Yun-Feng(yfxiao@pku.edu.cn)
Source title:Nature Communications
Abbreviated source title:Nat. Commun.
Volume:12
Issue:1
Issue date:December 2021
Publication year:2021
Article number:3179
Language:English
E-ISSN:20411723
Document type:Journal article (JA)
Publisher:Nature Research
Abstract:

Dissipative Kerr soliton (DKS) featuring broadband coherent frequency comb with compact size and low power consumption, provides an unparalleled tool for nonlinear physics investigation and precise measurement applications. However, the complex nonlinear dynamics generally leads to stochastic soliton formation process and makes it highly challenging to manipulate soliton number and temporal distribution in the microcavity. Here, synthesized and reconfigurable soliton crystals (SCs) are demonstrated by constructing a periodic intra-cavity potential field, which allows deterministic SCs synthesis with soliton numbers from 1 to 32 in a monolithic integrated microcavity. The ordered temporal distribution coherently enhanced the soliton crystal comb lines power up to 3 orders of magnitude in comparison to the single-soliton state. The interaction between the traveling potential field and the soliton crystals creates periodic forces on soliton and results in forced soliton oscillation. Our work paves the way to effectively manipulate cavity solitons. The demonstrated synthesized SCs offer reconfigurable temporal and spectral profiles, which provide compelling advantages for practical applications such as photonic radar, satellite communication and radio-frequency filter.
© 2021, The Author(s).
Number of references:57
Controlled terms:communication - crystal structure - detection method - filter - potential field - radar - temporal distribution - wavelength
Classification code:901 Geobase: Related Topics
DOI:10.1038/s41467-021-23172-2
Funding details: Number: 11654003, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 11825402, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 12041602, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 61435001, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 61635013, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 62075238, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: and 61675231, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;

 

Database:GEOBASE
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213410799009
Title:Broad-band phase retrieval method for transient radial shearing interference using chirp Z transform technique
Authors:Xue, Fang (1, 2); Duan, Ya-Xuan (1); Chen, Xiao-Yi (1, 2); Li, Ming (1, 2); Yuan, Suo-Chao (1, 2); Da, Zheng-Shang (1)
Author affiliation:(1) Advanced Optical Instrument Research Department, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Duan, Ya-Xuan(duanyaxuan@opt.ac.cn)
Source title:Chinese Physics B
Abbreviated source title:Chin. Phys.
Volume:30
Issue:8
Issue date:July 2021
Publication year:2021
Article number:084209
Language:English
ISSN:16741056
E-ISSN:20583834
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

The transient radial shearing interferometry technique based on fast Fourier transform (FFT) provides a means for the measurement of the wavefront phase of transient light field. However, which factors affect the spatial bandwidth of the wavefront phase measurement of this technology and how to achieve high-precision measurement of the broad-band transient wavefront phase are problems that need to be studied further. To this end, a theoretical model of phase-retrieved bandwidth of radial shearing interferometry is established in this paper. The influence of the spatial carrier frequency and the calculation window on phase-retrieved bandwidth is analyzed, and the optimal carrier frequency and calculation window are obtained. On this basis, a broad-band transient radial shearing interference phase-retrieval method based on chirp Z transform (CZT) is proposed, and the corresponding algorithm is given. Through theoretical simulation, a known phase is used to generate the interferogram and it is retrieved by the traditional method and the proposed method respectively. The residual wavefront RMS of the traditional method is 0.146λ, and it is 0.037λ for the proposed method, which manifests an improvement of accuracy by an order of magnitude. At the same time, different levels of signal-to-noise ratios (SNRs) from 50 dB to 10 dB of the interferogram are simulated, and the RMS of the residual wavefront is from 0.040λ to 0.066λ. In terms of experiments, an experimental verification device based on a phase-only spatial light modulator is built, and the known phase on the modulator is retrieved from the actual interferogram. The RMS of the residual wavefront retrieved through FFT is 0.112λ, and it decreases to 0.035λ through CZT. The experimental results verify the effectiveness of the method proposed in this paper. Furthermore, the method can be used in other types of spatial carrier frequency interference, such as lateral shearing interference, rotational shearing interference, flipping shearing interference, and four-wave shearing interference.
© 2021 Chinese Physical Society and IOP Publishing Ltd.
Number of references:22
Main heading:Interferometry
Controlled terms:Bandwidth - Fast Fourier transforms - Information retrieval - Light modulators - Phase measurement - Shearing - Signal to noise ratio - Underwater acoustic communication - Wavefronts - Z transforms
Uncontrolled terms:Chirp Z transform - Experimental verification - High-precision measurement - Lateral shearings - Shearing interference - Spatial light modulators - Theoretical modeling - Theoretical simulation
Classification code:604.1 Metal Cutting - 716.1 Information Theory and Signal Processing - 751.1 Acoustic Waves - 903.3 Information Retrieval and Use - 921.3 Mathematical Transformations - 941.4 Optical Variables Measurements - 942.2 Electric Variables Measurements
Numerical data indexing:Decibel 5.00e+01dB to 1.00e+01dB
DOI:10.1088/1674-1056/abff2f

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212710587204
Title:Digital micromirror device based ptychographic phase microscopy
Authors:Zheng, Juanjuan (1, 2, 3); Wen, Kai (1); Gao, Zhaolin (1); Zalevsky, Zeev (4); Gao, Peng (1)
Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an; 710071, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (4) Bar-Ilan University, Faculty of Engineering and Nano Technology Center, Ramat-Gan, Israel
Corresponding author:Gao, Peng(peng.gao@xidian.edu.cn)
Source title:Optics Communications
Abbreviated source title:Opt Commun
Volume:498
Issue date:November 1, 2021
Publication year:2021
Article number:127218
Language:English
ISSN:00304018
CODEN:OPCOB8
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

In this paper, ptychographic phase microscopy (PPM) with digital illumination addressing via a digital micromirror device (DMD) was demonstrated. A moving circular pattern is sequentially lighted up by a DMD and projected on the sample for illumination stepping, and a CCD camera records the generated diffraction patterns. Then, the quantitative phase distribution of the sample can be reconstructed from the diffraction patterns by using an iterative algorithm. Compared with conventional PPM approaches, this method has a fundamentally enhanced imaging speed due to the usage of the digital scan to replace the conventional mechanical scan. Furthermore, parallelized illumination strategy, which loads multiple pupils to DMD simultaneously, is used to further improve the imaging speed to 0.8 s per phase image. We envisage that this method will contribute to high-contrast, quantitative phase imaging of transparent samples without labeling.
© 2021 Elsevier B.V.
Number of references:35
Main heading:Interferometry
Controlled terms:CCD cameras - Diffraction patterns - Image enhancement - Iterative methods
Uncontrolled terms:Circular pattern - Digital micromirror device - Digital scans - Imaging speed - Iterative algorithm - Phase distribution - Ptychographic phase microscopy - Ptychography - Quantitative phase microscopy
Classification code:714.2 Semiconductor Devices and Integrated Circuits - 742.2 Photographic Equipment - 921.6 Numerical Methods - 941.4 Optical Variables Measurements
Numerical data indexing:Time 8.00E-01s
DOI:10.1016/j.optcom.2021.127218
Funding details: Number: -, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: 2020JK-193, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2020JQ-324, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: JB210513, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: JC2112, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: NSFC 62075177, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XJS210504, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: XJS210504, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:National Natural Science Foundation of China (NSFC 62075177); Shaanxi Natural Science Foundation of Shaanxi Province, China (2020JK-193, 2020JQ-324); the Fundamental Research Funds for the Central Universities (JB210513, JC2112, XJS210504 and XJS210504); Key Laboratory of Image Processing and Pattern Recognition, China, Jiangxi Province (ET202080417); Research Fund of State Key Laboratory of Transient Optics and Photonics, China.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609884046
Title:Panoramic video motion small target detection algorithm in complex background
Title of translation:复杂背景下全景视频运动小目标检测算法
Authors:Wang, Dian-Wei (1); Yang, Xu (1); Han, Peng-Fei (2); Liu, Ying (1); Xie, Yong-Jun (3); Song, Hai-Jun (3)
Author affiliation:(1) School of Telecommunication and Information Engineering, Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (2) Center for AI Research and Innovation, Westlake University, Hangzhou; 310024, China; (3) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China
Corresponding author:Yang, Xu(735583415@qq.com)
Source title:Kongzhi yu Juece/Control and Decision
Abbreviated source title:Kongzhi yu Juece Control Decis
Volume:36
Issue:1
Issue date:January 2021
Publication year:2021
Pages:249-256
Language:Chinese
ISSN:10010920
CODEN:KYJUEF
Document type:Journal article (JA)
Publisher:Northeast University
Abstract:In order to solve the problem of low detection accuracy of moving small targets in the panoramic video in complex background, a small target detection algorithm based on complex background motion is proposed. Firstly, to reduce the interference of complex background information and improve the accuracy of target detection, the fast robust principal component analysis (Fast RPCA) algorithm is used to separate the foreground background information of the panoramic video image, and the foreground information is extracted as an effective image feature. Then, the candidate frame size of the region proposal network (RPN) in the faster region-convolutional neural networks (Faster R-CNN) is improved to adapt to the target size in the panoramic image, and then the foreground feature map is trained. Finally, the convolutional layer output detection model is shared by the RPN network and the Fast R-CNN network to achieve accurate detection of small targets in the panoramic video image. Experiments show that the proposed algorithm can effectively suppress the influence of complex background information on target detection accuracy, and has high detection accuracy for small moving targets in panoramic video images.
Copyright ©2021 Control and Decision.
Number of references:19
Main heading:Convolutional neural networks
Controlled terms:Complex networks - Convolution - Image enhancement - Image segmentation - Motion analysis - Signal detection
Uncontrolled terms:Background information - Complex background - Detection accuracy - Foreground features - Foreground information - Robust principal component analysis - Small moving target - Small target detection
Classification code:716.1 Information Theory and Signal Processing - 722 Computer Systems and Equipment - 723.2 Data Processing and Image Processing
DOI:10.13195/j.kzyjc.2019.0686

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20202108688424
Title:Fine-Grained Visual Categorization by Localizing Object Parts with Single Image
Authors:Zheng, Xiangtao (1); Qi, Lei (1); Ren, Yutao (2); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Wuhan University of Technology, Wuhan; 430070, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Multimedia
Abbreviated source title:IEEE Trans Multimedia
Volume:23
Issue date:2021
Publication year:2021
Pages:1187-1199
Article number:9091241
Language:English
ISSN:15209210
E-ISSN:19410077
CODEN:ITMUF8
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Fine-grained visual categorization (FGVC) refers to assigning fine-grained labels to images which belong to the same base category. Due to the high inter-class similarity, it is challenging to distinguish fine-grained images under different subcategories. Recently, researchers have proposed to firstly localize key object parts within images and then find discriminative clues on object parts. To localize object parts, existing methods train detectors for different kinds of object parts. However, due to the fact that the same kind of object part in different images often changes intensely in appearance, the existing methods face two shortages: 1) Training part detector for object parts with diverse appearance is laborious; 2) Discriminative parts with unusual appearance may be neglected by the trained part detectors. To localize the key object parts efficiently and accurately, a novel FGVC method is proposed in the paper. The main novelty is that the proposed method localizes the key object parts within each image only depending on a single image and hence avoid the influence of diversity between parts in different images. The proposed FGVC method consists of two key steps. Firstly, the proposed method localizes the key parts in each image independently. To this end, potential object parts in each image are identified and then these potential parts are merged to generate the final representative object parts. Secondly, two kinds of features are extracted for simultaneously describing the discriminative clues within each part and the relationship between object parts. In addition, a part based dropout learning technique is adopted to boost the classification performance further in the paper. The proposed method is evaluated in comparison experiments and the experiment results show that the proposed method can achieve comparable or better performance than state-of-the-art methods.
© 1999-2012 IEEE.
Number of references:56
Main heading:Object detection
Controlled terms:Multimedia systems - Signal processing
Uncontrolled terms:Classification performance - Fine grained - Inter class - Learning techniques - Representative object - Single images - State-of-the-art methods - Visual categorization
Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 723.5 Computer Applications
DOI:10.1109/TMM.2020.2993960
Funding details: Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: QYZDY-SSW-JSC044, Acronym: -, Sponsor: -;Number: XAB2017B26,XAB2017B15,QYZDB-SSW-JSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61702498,61806193,61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Manuscript received September 12, 2019; revised February 18, 2020 and April 21, 2020; accepted April 30, 2020. Date of publication May 11, 2020; date of current version April 23, 2021. This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grants 61806193, 61702498, and 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grants XAB2017B26 and XAB2017B15, and in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Sebastian Knorr. (Corresponding author: Xiaoqiang Lu.) Xiangtao Zheng, Lei Qi, and Xiaoqiang Lu are with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China (e-mail: xiangtaoz@gmail.com; 553054612@qq.com; luxq666666@gmail.com).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212610557854
Title:Multichannel left-subtract-right feature vector piston error detection method based on a convolutional neural network????(Open Access)
Authors:WANG, PENG-FEI (1, 2); ZHAO, HUI (1); XIE, XIAO-PENG (1); ZHANG, YA-TING (1, 2); LI, CHUANG (1); FAN, XUE-WU (1)
Author affiliation:(1) Space Optical Technology Research Department, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:ZHAO, HUI(zhaohui@opt.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:14
Issue date:July 5, 2021
Publication year:2021
Pages:21320-21335
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

To realize the large-scale and high-precision co-phasing adjustment of syntheticaperture telescopes, we propose a multichannel left-subtract-right feature vector piston error detection method based on a convolutional neural network, which inherits the high precision and strong noise resistance of the DFA-LSR method while achieving a detection range of (-139λ, 139λ) (λ = 720 nm). In addition, a scheme to build large training datasets was proposed to solve the difficulty in collecting datasets using traditional neural network methods. Finally, simulations verified that this method can guarantee at least 94.96% accuracy with large samples, obtaining a root mean square error of 10.2 nm when the signal-to-noise ratio is 15.
© 2021 Optical Society of America.
Number of references:25
Main heading:Convolutional neural networks
Controlled terms:Convolution - Error detection - Feature extraction - Large dataset - Least squares approximations - Mean square error - Pistons - Signal to noise ratio
Uncontrolled terms:Detection methods - Detection range - Feature vectors - High-precision - Neural network method - Noise resistance - Root mean square errors - Training data sets
Classification code:612.1.1 Internal Combustion Engine Components - 716.1 Information Theory and Signal Processing - 921.6 Numerical Methods - 922.2 Mathematical Statistics
Numerical data indexing:Percentage 9.50e+01%, Size 1.02e-08m, Size 7.20e-07m
DOI:10.1364/OE.428690

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20213310764473
Title:Research on Deep Learning Denoising Method in an Ultra-Fast All-Optical Solid-State Framing Camera
Authors:Zhou, Jian (1); Wang, Zhuping (2); Wang, Tao (3); Yang, Qing (4); Wen, Keyao (3); Yan, Xin (3); He, Kai (3); Gao, Guilong (3); Yao, Dong (3); Yin, Fei (3, 4)
Author affiliation:(1) Xi’an Modern Control Technology Research Institute, Xi’an; 710065, China; (2) Xi’an Institute of Electromechanical Information Technology, Xi’an; 710065, China; (3) Key Laboratory of Ultra-Fast Photoelectric Diagnostics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (4) School of Mechanical Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an; 710049, China
Corresponding author:Yin, Fei(yinfei@opt.ac.cn)
Source title:Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Abbreviated source title:Lect. Notes Comput. Sci.
Volume:12736 LNCS
Part number:1 of 2
Issue title:Artificial Intelligence and Security - 7th International Conference, ICAIS 2021, Proceedings
Issue date:2021
Publication year:2021
Pages:78-85
Language:English
ISSN:03029743
E-ISSN:16113349
ISBN-13:9783030786083
Document type:Conference article (CA)
Conference name:7th International Conference on Artificial Intelligence and Security, ICAIS 2021
Conference date:July 19, 2021 - July 23, 2021
Conference location:Dublin, Ireland
Conference code:262659
Publisher:Springer Science and Business Media Deutschland GmbH
Abstract:

The ultra-fast all-optical solid-state framing camera (UASFC) is a new type of X-ray ultra-fast diagnostic technology. It uses X-ray excitation to change the refractive index distribution of the ultra-fast detection chip, and time-tuned multi-wavelength probe light for ultra-fast detection on the order of picoseconds or less. Due to the uneven intensity of the probe light wavelength and spatial diffraction, the noise of the detection image is too high, which directly affects the spatial and temporal resolution of the system. To improve the detection performance of the UASFC system, we adopted NLM image optimization technology based on a convolutional neural network, using 50 shots of the reticle image as the learning set and iterating the weight of the NLM image optimization filter. The CCD image obtained by the four-channel wavelength spectroscopy system is noise-reduced and optimized, which greatly improves the image contrast and edge definition, reduces image noise, and further improves the time and space resolution of the UASFC system.
© 2021, Springer Nature Switzerland AG.
Number of references:17
Main heading:Deep learning
Controlled terms:Cameras - Convolutional neural networks - Image denoising - Image enhancement - Learning systems - Probes - Refractive index - X rays
Uncontrolled terms:Detection performance - Diagnostic technologies - Image optimization - Multi-wavelengths - Refractive-index distribution - Space resolutions - Spatial and temporal resolutions - Spatial diffraction
Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 742.2 Photographic Equipment - 932.1 High Energy Physics
DOI:10.1007/978-3-030-78609-0_7

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213610853430
Title:Optical design and analysis of compact visible and medium-wave infrared whisking broom imaging system
Title of translation:紧凑中波/可见摆扫成像装置光学设计与分析
Authors:Liu, Bo (1); Liu, Aimin (2); Li, Qiaoling (2); Xie, Laiyun (2)
Author affiliation:(1) College of Aerospace Science and Engineering, National University of Defense Technology, Changsha; 410003, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Liu, Aimin(liuaimin1232003@163.com)
Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.
Volume:50
Issue:8
Issue date:August 25, 2021
Publication year:2021
Article number:20200517
Language:Chinese
ISSN:10072276
Document type:Journal article (JA)
Publisher:Chinese Society of Astronautics
Abstract:

To accomplish long-range visible and medium-wave infrared whisking broom imaging detection under strict space limitation, dual-band catadioptric shrink-beam system, double fast steering mirrors, and subsequet compact single-wave lenses was used to build a compact dual-band whisking broom imaging system through lens system design optimization. Among them, dual-band catadioptric shrink-beam system was composed of two-mirror Ritchey Chretien system, CaF2 dichroic prism and subsequet single-wave lenses. The image quality of the shrink-beam system was closed to diffraction limit in the 0.6-0.9 μm and 3.6-4.9 μm wave bands. Image motion of the dual-band shrink-beam system were controlled within halves of the respective pixels during broom imaging process. The effective focal length of the dual-band catadioptric system in the visible band was 1752 mm, there was no lens in between the RC, the three dimensional size of the optical system was 380 mm (axial)×Φ360, the telephoto ratio was 0.22, the line obscuration ratio was 0.34. Based on simulation and analysis, when the incident angles were larger than 30°, the point source transmittance (PST) of the dual-band system was less than 1×10−4 without additional front baffles. And this system was designed with mature optical cold working, installation and adjustment process and low cost.
© 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
Number of references:34
Main heading:Fluorine compounds
Controlled terms:Calcium fluoride - Cold working - Diffraction - Fluorspar - Imaging systems - Lenses - Mirrors - Optical design - Optical systems
Uncontrolled terms:Design and analysis - Diffraction limits - Effective focal lengths - Fast steering mirror - Imaging detections - Lens system designs - Simulation and analysis - Space limitations
Classification code:482.2 Minerals - 535.2 Metal Forming - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 804.2 Inorganic Compounds
Numerical data indexing:Size 1.75e+00m, Size 3.60e-06m to 4.90e-06m, Size 3.80e-01m, Size 6.00e-07m to 9.00e-07m
DOI:10.3788/IRLA20200517
Funding details: Number: 11404387, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:The National Natural Science Foundation of China (No. 11404387)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410162263
Title:Stray light test facility for multispectral spaced-based optical system with large field of view
Authors:Zhao, Qice (1); Xu, Xiping (1); Qiao, Yang (1); Pan, Yue (1); Lu, Yi (1); Xu, Liang (2); Liu, Feng (2)
Author affiliation:(1) College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun; Jilin; 130022, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shanxi; 710119, China
Corresponding author:Xu, Xiping(xxp@cust.edu.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11763
Part number:1 of 1
Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications
Issue date:2021
Publication year:2021
Article number:117639V
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643611
Document type:Conference article (CA)
Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications
Conference date:November 5, 2020 - November 7, 2020
Conference location:Kunming, China
Conference code:167886
Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory
Publisher:SPIE
Abstract:In order to evaluate the ability of a space-based optical system to suppress off-axis stray light, a large-field, multispectrum space-based stray light test method based on point source transmittance (PST) is proposed in this paper. A stray light test facility is constructed using multiple laser sources, large aperture off-axis reflective parallel light tubes and a high-precision positioning mechanism to evaluate the PST index of stray light in the visible and near infrared bands for a space-based optical system. Based on theoretical analysis, experimental measurements of standard lenses in various wavelength bands have proven that the dynamic range of the facility in the visible light band is 10-6 and in the infrared band is 10-3. The facility has the advantages of wide range of detectable wavelengths, high automation, and large dynamic range. The test results can be used for correction of the hood, which provides a reliable traceability basis for the stray light suppression of a space-based optical system.
© 2021 SPIE
Number of references:14
Main heading:Optical systems
Controlled terms:Infrared devices - Stray light - Test facilities
Uncontrolled terms:High precision positioning - Large field of views - Measurements of - Multiple lasers - Space based optical systems - Stray light suppression - Visible and near infrared - Visible light bands
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems
DOI:10.1117/12.2588249
Funding details: Number: 61605016, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Science Foundation for Young Scientists of China (Grant No. 61605016);

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211610236305
Title:Corrective method for spectral offset error caused by radial distortion in the large aperture static imaging spectrometer
Title of translation:大孔径静态干涉成像光谱仪径向畸变导致的谱线偏移误差的校正
Authors:An, Ling-Ping (1, 2); Wang, Shuang (1); Zhang, Geng (1); Li, Juan (1); Liu, Xue-Bin (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Wang, Shuang(wangshuang@opt.ac.cn)
Source title:Chinese Optics
Abbreviated source title:Chin. Opt.
Volume:14
Issue:2
Issue date:March 2021
Publication year:2021
Pages:382-389
Language:Chinese
ISSN:20951531
Document type:Journal article (JA)
Publisher:Editorial Office of Chinese Optics
Abstract:

In order to improve the spectral calibration accuracy of the large aperture static imaging spectrometer when its field of view is increased, and to reduce the influence of radial distortion on its spectral accuracy, we propose a corrective method for spectral calibration coefficients based on a spectral distortion correlation model. To begin the process, the wave number and wavelength correction formulas are given. Using 594.1 nm and 632.8 nm gas lasers, a spectroscopic imaging experiment was performed on the imaging spectrometer, and the data was processed and analyzed. The results show that when there is a barrel distortion of 0.3%, the inversion spectrum at the edge of the field of view shifts approximately 2 nm. After implementing the corrective method of this paper, the line shift is reduced to approximately 0.1 nm. This method only needs to be corrected according to the lens distortion parameters, which simplifies the laboratory spectral calibration process and improves work efficiency. It can also be applied to the orbit parameter correction of spaceborne interference spectral data.
Copyright ©2021 Chinese Optics. All rights reserved.
Number of references:20
Main heading:Spectrometers
Controlled terms:Calibration - Gas lasers
Uncontrolled terms:Correction formulas - Correlation modeling - Imaging spectrometers - Lens distortion parameters - Radial distortions - Spectral calibration - Spectral distortions - Spectroscopic imaging
Classification code:741.3 Optical Devices and Systems - 744.2 Gas Lasers
Numerical data indexing:Percentage 3.00e-01%, Size 1.00e-10m, Size 2.00e-09m, Size 5.94e-07m, Size 6.33e-07m
DOI:10.37188/CO.2020-0084
Funding details: Number: 2018YFB0504900,2018YFB0504901, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:收稿日期：2020-05-08；修订日期：2020-06-15 基金项目：国家重点研发计划项目（No. 2018YFB0504900，No. 2018YFB0504901） Supported by National Key R&D Program of China (No. 2018YFB0504900, No. 2018YFB0504901)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310140065
Title:Person Reidentification via Unsupervised Cross-View Metric Learning
Authors:Feng, Yachuang (1); Yuan, Yuan (2); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi'an; 710072, China
Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)
Source title:IEEE Transactions on Cybernetics
Abbreviated source title:IEEE Trans. Cybern.
Volume:51
Issue:4
Issue date:April 2021
Publication year:2021
Pages:1849-1859
Article number:8694838
Language:English
ISSN:21682267
E-ISSN:21682275
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Person reidentification (Re-ID) aims to match observations of individuals across multiple nonoverlapping camera views. Recently, metric learning-based methods have played important roles in addressing this task. However, metrics are mostly learned in supervised manners, of which the performance relies heavily on the quantity and quality of manual annotations. Meanwhile, metric learning-based algorithms generally project person features into a common subspace, in which the extracted features are shared by all views. However, it may result in information loss since these algorithms neglect the view-specific features. Besides, they assume person samples of different views are taken from the same distribution. Conversely, these samples are more likely to obey different distributions due to view condition changes. To this end, this paper proposes an unsupervised cross-view metric learning method based on the properties of data distributions. Specifically, person samples in each view are taken from a mixture of two distributions: one models common prosperities among camera views and the other focuses on view-specific properties. Based on this, we introduce a shared mapping to explore the shared features. Meanwhile, we construct view-specific mappings to extract and project view-related features into a common subspace. As a result, samples in the transformed subspace follow the same distribution and are equipped with comprehensive representations. In this paper, these mappings are learned in an unsupervised manner by clustering samples in the projected space. Experimental results on five cross-view datasets validate the effectiveness of the proposed method.
© 2013 IEEE.
Number of references:66
Main heading:Learning algorithms
Controlled terms:Cameras - Learning systems - Mapping
Uncontrolled terms:Data distribution - Different distributions - Information loss - Manual annotation - Metric learning - Multiple nonoverlapping cameras - Person re identifications - Specific properties
Classification code:405.3 Surveying - 742.2 Photographic Equipment
DOI:10.1109/TCYB.2019.2909480
Funding details: Number: 2017YFB0502900, Acronym: -, Sponsor: National Key Research and Development Program of China;
Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 61702498, Grant 61761130079, and Grant 61772510, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the CAS "Light of West China" Program under Grant XAB2017B15, in part by the Key Research Program of Frontier Sciences, CAS under Grant QYZDY-SSWJSC044, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, and in part by the State Key Program of National Natural Science of China under Grant 61632018. This paper was recommended by Associate Editor H. Lu. (Corresponding author: Xiaoqiang Lu.)

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213410810537
Title:High Precision Centroid Location Algorithm Based on Cubic Spline Fitting and Interpolation
Title of translation:基于三次样条拟合插值的高精度质心定位方法
Authors:Liu, Jie (1, 2); Zhang, Geng (1); Feng, Xiangpeng (1); Zhang, Zhinan (1); Li, Siyuan (1); Hu, Bingliang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Guangxue Xuebao/Acta Optica Sinica
Abbreviated source title:Guangxue Xuebao
Volume:41
Issue:12
Issue date:June 25, 2021
Publication year:2021
Article number:1212004
Language:Chinese
ISSN:02532239
CODEN:GUXUDC
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

In this paper, we proposed a high-precision centroid location algorithm based on cubic spline fitting and interpolation combining the advantages of centroid algorithms and surface fitting algorithms. Besides, the principle behind its double error suppression was given. The simulation showed that the location error of the proposed algorithm at different SNRs was significantly smaller than that of traditional centroid algorithms. When the SNR was 20 dB, the root-mean-square error of the proposed algorithm was only 0.003 pixel. Furthermore, the star images from real instruments verified the effectiveness of this algorithm once again. In summary, this algorithm can effectively suppress the location error and has strong noise resistance, which can be widely applied without requiring specific star models.
© 2021, Chinese Lasers Press. All right reserved.
Number of references:18
Main heading:Surface fitting
Controlled terms:Errors - Interpolation - Location - Mean square error - Signal to noise ratio
Uncontrolled terms:Centroid algorithm - Error suppression - Fitting algorithms - High-precision - Location algorithms - Location errors - Noise resistance - Root mean square errors
Classification code:716.1 Information Theory and Signal Processing - 921.6 Numerical Methods - 922.2 Mathematical Statistics
Numerical data indexing:Decibel 2.00e+01dB
DOI:10.3788/AOS202141.1212004

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310447580
Title:Non-iterative complex wave-field reconstruction based on Kramers-Kronig relations????(Open Access)
Authors:Shen, Cheng (1); Liang, Mingshu (1); Pan, An (2); Yang, Changhuei (1)
Author affiliation:(1) Department of Electrical Engineering, California Institute of Technology, Pasadena; CA; 91125, United States; (2) Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China
Corresponding author:Shen, Cheng(cshen3@caltech.edu)
Source title:Photonics Research
Abbreviated source title:Photon. Res.
Volume:9
Issue:6
Issue date:June 1, 2021
Publication year:2021
Pages:1003-1012
Language:English
ISSN:23279125
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

A non-iterative and non-interferometric computational imaging method to reconstruct a complex wave field called synthetic aperture imaging based on Kramers-Kronig relations (KKSAI) is reported. By collecting images through a modified microscope system with pupil modulation capability, we show that the phase and amplitude profile of the sample at pupil limited resolution can be extracted from as few as two intensity images by using Kramers-Kronig (KK) relations. It is established that as long as each subaperture's edge crosses the pupil center, the collected raw images are mathematically analogous to off-axis holograms. This in turn allows us to adapt a recently reported KK-relations-based phase recovery framework in off-axis holography for use in KKSAI. KKSAI is non-iterative, free of parameter tuning, and applicable to a wider range of samples. Simulation and experiment results have proved that it has much lower computational burden and achieves the best reconstruction quality when compared with two existing phase imaging methods.
© 2021 Chinese Laser Press
Number of references:40
Main heading:Kramers-Kronig relations
Controlled terms:Holograms - Iterative methods
Uncontrolled terms:Computational burden - Computational imaging - Limited resolution - Microscope systems - Modulation capability - Off-axis holography - Reconstruction quality - Synthetic aperture imaging
Classification code:743 Holography - 921.1 Algebra - 921.6 Numerical Methods
DOI:10.1364/PRJ.419886

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20210809947554
Title:A Supervised Segmentation Network for Hyperspectral Image Classification
Authors:Sun, Hao (1, 2); Zheng, Xiangtao (3); Lu, Xiaoqiang (3)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) The University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)
Source title:IEEE Transactions on Image Processing
Abbreviated source title:IEEE Trans Image Process
Volume:30
Issue date:2021
Publication year:2021
Pages:2810-2825
Article number:9347809
Language:English
ISSN:10577149
E-ISSN:19410042
CODEN:IIPRE4
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:Recently, deep learning has drawn broad attention in the hyperspectral image (HSI) classification task. Many works have focused on elaborately designing various spectral-spatial networks, where convolutional neural network (CNN) is one of the most popular structures. To explore the spatial information for HSI classification, pixels with its adjacent pixels are usually directly cropped from hyperspectral data to form HSI cubes in CNN-based methods. However, the spatial land-cover distributions of cropped HSI cubes are usually complicated. The land-cover label of a cropped HSI cube cannot simply be determined by its center pixel. In addition, the spatial land-cover distribution of a cropped HSI cube is fixed and has less diversity. For CNN-based methods, training with cropped HSI cubes will result in poor generalization to the changes of spatial land-cover distributions. In this paper, an end-to-end fully convolutional segmentation network (FCSN) is proposed to simultaneously identify land-cover labels of all pixels in a HSI cube. First, several experiments are conducted to demonstrate that recent CNN-based methods show the weak generalization capabilities. Second, a fine label style is proposed to label all pixels of HSI cubes to provide detailed spatial land-cover distributions of HSI cubes. Third, a HSI cube generation method is proposed to generate plentiful HSI cubes with fine labels to improve the diversity of spatial land-cover distributions. Finally, a FCSN is proposed to explore spectral-spatial features from finely labeled HSI cubes for HSI classification. Experimental results show that FCSN has the superior generalization capability to the changes of spatial land-cover distributions.
© 1992-2012 IEEE.
Number of references:52
Main heading:Spatial distribution
Controlled terms:Classification (of information) - Convolution - Convolutional neural networks - Deep learning - Geometry - Image classification - Image segmentation - Pixels - Spectroscopy
Uncontrolled terms:Adjacent pixels - Classification tasks - Generalization capability - Generation method - Hyperspectral Data - Spatial features - Spatial informations - Supervised segmentation
Classification code:716.1 Information Theory and Signal Processing - 921 Mathematics
DOI:10.1109/TIP.2021.3055613
Funding details: Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: 61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JC-23,2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:Manuscript received May 7, 2020; revised October 3, 2020; accepted January 22, 2021. Date of publication February 4, 2021; date of current version February 12, 2021. This work was supported in part by the National Science Fund for Distinguished Young Scholars under Grant 61925112, in part by the National Natural Science Foundation of China under Grant 61806193 and Grant 61772510, in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340 and 2019JC-23, and in part by CAAI-Huawei MindSpore Open Fund. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Jocelyn Chanussot. (Corresponding author: Xiangtao Zheng.) Hao Sun is with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410162068
Title:Research on geometric error correction of pushbroom hyperspectral camera carried by UAV
Authors:Yihao, Wang (1, 3); Qiang, Cong (2); Shun, Yao (2); Xinyin, Jia (1); Jianyu, Chen (3); Siyuan, Li (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Xi'an; Shanxi; 710119, China; (2) China Spacesat Co. Ltd, Beijing; 100094, China; (3) State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou; Zhejiang; 310012, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11763
Part number:1 of 1
Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications
Issue date:2021
Publication year:2021
Article number:117634G
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643611
Document type:Conference article (CA)
Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications
Conference date:November 5, 2020 - November 7, 2020
Conference location:Kunming, China
Conference code:167886
Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory
Publisher:SPIE
Abstract:In recent years, the commercialized low-cost rotor UAV equipped with small hyperspectral camera has become an emerging way to acquire hyperspectral remote sensing data due to its advantages of convenient data acquisition and low cost, and has been widely used in environmental monitoring, precision agriculture, ocean development and other fields. Due to its light weight, the flight process of the rotor UAV is vulnerable to the influence of air flow, which leads to the poor stability of the platform and resulting in the geometric distortion of the imaging. This situation is particularly prominent in the obvious air flow areas such as the lake and the sea, which restricts the application in related fields. In this paper, the geometric processing of UAV-borne hyperspectral measured data collected at a wharf in Qiandao Lake is studied. There are two major factors lead to geometric error. One is the longitude and latitude step error, the other is the frame frequency of the navigation data is lower than the image exposure frame frequency. In this situation, this paper proposes a step fitting method to perform geometric correction and error correction for the hyperspectral airstrip data. Compared with the traditional Kalman filtering method and the global linear fitting method, the proposed method can better correct the geometric distortion of hyperspectral image caused by the low-precision GPS/INS system, which provides a foundation for the subsequent quantitative application of lightweight UAV hyperspectral camera in various fields.
© 2021 SPIE
Number of references:11
Main heading:Unmanned aerial vehicles (UAV)
Controlled terms:Agricultural robots - Air - Cameras - Costs - Data acquisition - Error correction - Geometry - Lakes - Remote sensing - Spectroscopy
Uncontrolled terms:Environmental Monitoring - Geometric correction - Geometric distortion - Geometric processing - Hyper-spectral cameras - Hyperspectral remote sensing data - Kalman filtering method - Ocean development
Classification code:652.1 Aircraft, General - 723.2 Data Processing and Image Processing - 742.2 Photographic Equipment - 804 Chemical Products Generally - 911 Cost and Value Engineering; Industrial Economics - 921 Mathematics
DOI:10.1117/12.2586957

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410165526
Title:Hyperspectral image super-resolution with self-supervised spectral-spatial residual network????(Open Access)
Authors:Chen, Wenjing (1, 2); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Zheng, Xiangtao(zhengxiangtao@opt.cn)
Source title:Remote Sensing
Abbreviated source title:Remote Sens.
Volume:13
Issue:7
Issue date:April 1, 2021
Publication year:2021
Article number:1260
Language:English
E-ISSN:20724292
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

Recently, many convolutional networks have been built to fuse a low spatial resolution (LR) hyperspectral image (HSI) and a high spatial resolution (HR) multispectral image (MSI) to obtain HR HSIs. However, most deep learning-based methods are supervised methods, which require sufficient HR HSIs for supervised training. Collecting plenty of HR HSIs is laborious and time-consuming. In this paper, a self-supervised spectral-spatial residual network (SSRN) is proposed to alleviate dependence on a mass of HR HSIs. In SSRN, the fusion of HR MSIs and LR HSIs is considered a pixel-wise spectral mapping problem. Firstly, this paper assumes that the spectral mapping between HR MSIs and HR HSIs can be approximated by the spectral mapping between LR MSIs (derived from HR MSIs) and LR HSIs. Secondly, the spectral mapping between LR MSIs and LR HSIs is explored by SSRN. Finally, a self-supervised fine-tuning strategy is proposed to transfer the learned spectral mapping to generate HR HSIs. SSRN does not require HR HSIs as the supervised information in training. Simulated and real hyperspectral databases are utilized to verify the performance of SSRN.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:56
Main heading:Photomapping
Controlled terms:Convolutional neural networks - Deep learning - Image resolution - Spectroscopy
Uncontrolled terms:Convolutional networks - High spatial resolution - Image super resolutions - Learning-based methods - Multispectral images - Spatial resolution - Supervised methods - Supervised trainings
Classification code:405.3 Surveying
DOI:10.3390/rs13071260
Funding details: Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: 61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JC-23,2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:Funding: This work was funded in part by the National Science Fund for Distinguished Young Scholars under grant 61925112, in part by the National Natural Science Foundation of China under grant 61806193 and grant 61772510, in part by the Innovation Capability Support Program of Shaanxi under grant 2020KJXX-091 and grant 2020TD-015, and in part by the Natural Science Basic Research Program of Shaanxi under grants 2019JQ-340 and 2019JC-23.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211710243143
Title:Sparse constrained low tensor rank representation framework for hyperspectral unmixing????(Open Access)
Authors:Dong, Le (1, 2); Yuan, Yuan (3)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi’an; 710072, China
Corresponding author:Yuan, Yuan(y.yuan@nwpu.edu.cn)
Source title:Remote Sensing
Abbreviated source title:Remote Sens.
Volume:13
Issue:8
Issue date:April 2, 2021
Publication year:2021
Article number:1473
Language:English
E-ISSN:20724292
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

Recently, non-negative tensor factorization (NTF) as a very powerful tool has attracted the attention of researchers. It is used in the unmixing of hyperspectral images (HSI) due to its excellent expression ability without any information loss when describing data. However, most of the existing unmixing methods based on NTF fail to fully explore the unique properties of data, for example, low rank, that exists in both the spectral and spatial domains. To explore this low-rank structure, in this paper we learn the different low-rank representations of HSI in the spectral, spatial and non-local similarity modes. Firstly, HSI is divided into many patches, and these patches are clustered multiple groups according to the similarity. Each similarity group can constitute a 4-D tensor, including two spatial modes, a spectral mode and a non-local similarity mode, which has strong low-rank properties. Secondly, a low-rank regularization with logarithmic function is designed and embedded in the NTF framework, which simulates the spatial, spectral and non-local similarity modes of these 4-D tensors. In addition, the sparsity of the abundance tensor is also integrated into the unmixing framework to improve the unmixing performance through the L2,1 norm. Experiments on three real data sets illustrate the stability and effectiveness of our algorithm compared with five state-of-the-art methods.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:46
Main heading:Tensors
Controlled terms:Spectroscopy
Uncontrolled terms:Hyperspectral unmixing - Information loss - Logarithmic functions - Low-rank properties - Low-rank representations - Non-local similarities - Spatial domains - Tensor factorization
Classification code:921.1 Algebra
DOI:10.3390/rs13081473
Funding details: Number: 61632018, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61825603, Acronym: BNSF, Sponsor: Bulgarian National Science Fund;Number: 2020YFB2103902, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:This research was funded by National Key R&D Program of China 2020YFB2103902, The National Science Fund for Distinguished Young Scholars 61825603 and Key Program of National Natural Science Foundation of China 61632018.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211610223004
Title:Infrared and visible image fusion based on edge-preserving guided filter and infrared feature decomposition
Authors:Ren, Long (1, 2, 3); Pan, Zhibin (2); Cao, Jianzhong (1); Zhang, Hui (1, 3); Wang, Hao (1)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Faculty of electronics and communications of Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing; 100049, China
Corresponding author:Ren, Long(renlong513@126.com)
Source title:Signal Processing
Abbreviated source title:Signal Process
Volume:186
Issue date:September 2021
Publication year:2021
Article number:108108
Language:English
ISSN:01651684
CODEN:SPRODR
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Infrared (IR) images can distinguish salient targets from their backgrounds based on the radiation difference in all-weather conditions. By contrast, visible (VIS) images can contain high-resolution texture and details information, which is more suitable for human observation. Therefore, it is quite necessary to combine both imaging advantages of these two kinds of images. Compared with the existing methods, we believe that scale decomposition based methods are the most active and efficient image fusion methods, which also have the best fusion effects. Inspired by the present scale decomposition methods, we propose a new feature decomposition method. Firstly, we propose an improved guided filter called edge-preserving guided filter (EPGF), which adopts the image gradient map for further improving the filtering effect. Subsequently, by using the EPGF, we decompose the IR and VIS images into three kinds of layers, including salient feature layers, luminance layers and detail layers. At the same time, we combine all the layers together to get an initial fusion result. Finally, we optimize the initial fusion image according to a new image fusion optimization model and ADMM, and the final fusion result will be obtained after several iterations. Compared with other scale decomposition methods, our proposed feature decomposition based method takes the IR salient targets, IR and VIS background illumination, as well as VIS details into consideration which is more in line with human visual observation, besides the computational efficiency is also superior. Experimental results indicate that this method has better subjective and objective evaluation results compared with other state-of-the-art methods.
© 2021 Elsevier B.V.
Number of references:55
Main heading:Image fusion
Controlled terms:Computational efficiency - Image enhancement - Textures
Uncontrolled terms:ADMM image optimization - Condition - Decomposition methods - Edge preserving - Edge-preserving guided filter - Feature decomposition - Guided filters - Infrared and visible image - Infrared features - Visible image
Classification code:723.2 Data Processing and Image Processing
DOI:10.1016/j.sigpro.2021.108108
Funding details: Number: XAB2017B22, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;
Funding text:This work was supported by West Light Foundation of The Chinese Academy of Sciences (XAB2017B22).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213710879678
Title:Ultra-broadband Bragg concave diffraction grating designs on 220-nm SOI for wavelength demultiplexing????(Open Access)
Authors:Li, Ke (1); Zhu, Jingping (1); Duan, Qihang (2, 3); Sun, Yuzhou (1); Hou, Xun (1, 2)
Author affiliation:(1) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Xi'An Jiaotong University, Xi'an; 710049, China; (2) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Xi'An Sino Huaxin Measurement & Control Co., Ltd., Xi'an; 710304, China
Corresponding author:Zhu, Jingping(jpzhu@xjtu.edu.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:19
Issue date:September 13, 2021
Publication year:2021
Pages:30259-30271
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

The appropriate broadband design of a de/multiplexer can significantly increase the channel number and consequently the transmission capacity of a wavelength division multiplexing system. Herein, we present the first ultra-broadband Bragg concave diffraction grating (CDG) on a 220-nm silicon-on-insulator, covering most of the E, S, C, L, and U telecommunication wavebands spanning from 1.425 to 1.675 μm. A wide-band-gap Bragg mirror is employed to facilitate broadband reflection, with a low diffraction order of grating for a sufficient free spectral range. Numerical simulations show that the proposed approaching blazed concave diffraction grating (AB-CDG) for the two-material case exhibits a high integration, simple fabrication process, and promising spectral performance. We fabricate the grating for design verification with a low transmission loss of -0.6 dB and a crosstalk below -33.7 dB for the eight measured wavelength channels covering the spectral range from 1.5 to 1.61 μm that is limited by the bandwidth of the grating coupler. This design can be used for broadband wavelength demultiplexing, frontier astronomical observation, and spectroscopic imaging.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Number of references:32
Main heading:Diffraction gratings
Controlled terms:Demultiplexing - Diffraction - Energy gap - Multiplexing equipment - Silicon on insulator technology - Transmissions - Ultra-wideband (UWB) - Wave transmission
Uncontrolled terms:Astronomical observation - Concave diffraction grating - Spectral performance - Spectroscopic imaging - Telecommunication wavebands - Transmission capacities - Wavelength demultiplexing - Wavelength-division multiplexing system
Classification code:602.2 Mechanical Transmissions - 714.2 Semiconductor Devices and Integrated Circuits - 716.3 Radio Systems and Equipment - 741.3 Optical Devices and Systems
Numerical data indexing:Decibel -3.37e+01dB, Decibel -6.00e-01dB, Size 1.42e-06m to 1.68e-06m, Size 1.50e-06m to 1.61e-06m, Size 2.20e-07m
DOI:10.1364/OE.431133
Funding details: Number: 61890961, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2018JM6008, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:Funding. National Natural Science Foundation of China (61890961); Natural Science Basic Research Program of Shaanxi Province (2018JM6008).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20210609891557
Title:Quantitative atmospheric rendering for real-time infrared scene simulation
Authors:Wu, Xin (1); Zhang, Chi (1); Huang, Melin (1, 2); Yang, Chen (3); Ding, Guopeng (1)
Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; Shaanxi; 710071, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (3) School of Automation and Information Engineering, Xi'an University of Technology, Xi'an; Shaanxi; 710048, China
Corresponding author:Huang, Melin(phmelin@snolab.ca)
Source title:Infrared Physics and Technology
Abbreviated source title:Infrared Phys Technol
Volume:114
Issue date:May 2021
Publication year:2021
Article number:103610
Language:English
ISSN:13504495
CODEN:IPTEEY
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:The radiation transfer of the Earth's atmosphere is a complex progress, which involves electromagnetic propagation, thermodynamics, and molecular spectroscopy. Atmospheric effects on an infrared scene were presented as transmission, absorption, and scattering. Atmospheric rendering thus aims to visually display these effects of the radiation through the Earth's atmosphere. In this paper, a quantitative atmospheric rendering method was proposed for real-time infrared scene simulation. By counting the selective absorption of water, carbon dioxide, and ozone on an infrared spectrum, transmittance was calculated using Lambert–Beer's law, the steady-state path radiation was precomputed according to Kirchhoff's law, and the Rayleigh and Mie scattering effects were calculated with GPU when an infrared scene was rendered in real-time. Simulations were conducted to verify the performance of the proposed method by comparing our results with those obtained from the MODTRAN program.
© 2021 Elsevier B.V.
Number of references:35
Main heading:Rendering (computer graphics)
Controlled terms:Absorption spectroscopy - Carbon dioxide - Earth atmosphere - Molecular spectroscopy - Radiation effects - Thermodynamics - Water absorption
Uncontrolled terms:Atmospheric effects - Electromagnetic propagation - Infrared spectrum - Radiation transfer - Rayleigh and Mie scattering - Rendering methods - Scene simulations - Selective absorption
Classification code:443.1 Atmospheric Properties - 641.1 Thermodynamics - 723.2 Data Processing and Image Processing - 802.3 Chemical Operations - 804.2 Inorganic Compounds
DOI:10.1016/j.infrared.2020.103610
Funding details: Number: 17JK0536, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Provincial Department of Education;Number: 2019010810063, Acronym: -, Sponsor: Aeronautical Science Foundation of China;Number: B17035, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;Number: JB180510, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work is supported by the National Science Foundation for Distinguished Young Scholars of China (61904138, 61705179), and partial funding is provided by the Fundamental Research Funds for the Central Universities (JB180510), Aeronautical Science Foundation of China (2019010810063), the 111 Project (B17035), Natural Science Foundation of Shaanxi Provincial Department of Education (17JK0536), and Natural Science Basic Research Program of Shaanxi (2019JQ-235).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213210748432
Title:Infrared and visible image fusion based on variational auto-encoder and infrared feature compensation
Authors:Ren, Long (1, 2, 3); Pan, Zhibin (2); Cao, Jianzhong (1); Liao, Jiawen (1, 2, 3)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Faculty of Electronics and Communications of Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing; 100049, China
Corresponding author:Ren, Long(renlong@opt.ac.cn)
Source title:Infrared Physics and Technology
Abbreviated source title:Infrared Phys Technol
Volume:117
Issue date:September 2021
Publication year:2021
Article number:103839
Language:English
ISSN:13504495
CODEN:IPTEEY
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

With high sensitivity to capture rich details, visible imaging equipment can take images containing more textures and contours which are important to visual perception. Unlike visible cameras, infrared imaging devices can detect targets invisible in visible images, because the imaging principle of infrared sensors derives from differences of thermal radiation. Thus, the purpose of image fusion is to merge as much meaningful feature information from the infrared and visible images into the fused image as possible, such as contours as well as textures of the visible image and thermal targets of the infrared image. In this paper, we propose an image fusion network based on variational auto-encoder (VAE), which performs the image fusion process in deep hidden layers. We divide the proposed network into image fusion network and infrared feature compensation network. Firstly, in the image fusion network, the encoder of the image fusion network is created to generate the latent vectors in hidden layers from the input visible image and infrared image. Secondly, two different latent vectors merge into one based on the product of Gaussian probability density; accordingly, the decoder begins to reconstruct the fused image with the descent of the loss function value. Meanwhile, Residual block and symmetric skip connection methods are added to the network to enhance the efficiency of network training. Finally, due to the defect of the loss function setting in the fusion network, an infrared feature compensation network is designed to compensate critical radiation features of the infrared image. Experimental results on public available datasets demonstrate that the proposed method is superior to other traditional and deep learning methods in both objective metrics and subjective visual perception.
© 2021
Number of references:46
Main heading:Image fusion
Controlled terms:Deep learning - Infrared detectors - Neural networks - Probability density function - Signal encoding - Textures - Thermography (imaging) - Vision
Uncontrolled terms:Autoencoders - Convolutional neural network - Feature compensation - Fused images - Infrared and visible image - Infrared features - Thermal - Variational auto-encoder - Visible image - Visual perception
Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 742.1 Photography - 922.1 Probability Theory - 944.7 Radiation Measuring Instruments
DOI:10.1016/j.infrared.2021.103839
Funding details: Number: 2019JQ-295, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by National Natural Science Foundation of China (NSFC) (51905529); Natural Science Basic Research Program of Shaanxi Province (2019JQ-295).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211010037844
Title:Correction of the error induced by obscurations of Ritchey-Chretien collimators for high-resolution space camera MTF measured with the ISO 12233 slanted-edge method
Authors:Liu, Shangkuo (1, 2); Liu, Kai (1); E, Kewei (1); Wang, Tao (1); Li, Zhaohui (1); Yao, Baoli (1)
Author affiliation:(1) Chinese Academy of Science, Xi'an Institute of Optics and Precision Mechanics, No.17 Xinxi Road, Xi'an; 710119, China; (2) University of Chinese Academy of Science, No.19(A) Yuquan Road, Beijing; 100049, China
Corresponding author:Liu, Shangkuo(liushangkuo@opt.ac.cn)
Source title:Optik
Abbreviated source title:Optik
Volume:235
Issue date:June 2021
Publication year:2021
Article number:166653
Language:English
ISSN:00304026
Document type:Journal article (JA)
Publisher:Elsevier GmbH
Abstract:We propose a method to correct the error induced by the obscurations of Ritchey-Chretien (R-C) collimators, when measuring modulation transfer function (MTF) of high-resolution space cameras by the ISO 12,233 slanted-edge method. The obscurations of an R-C collimator include the secondary mirror (SM) and its supporting bars. Mathematical models are derived to simulate possible obscurations by virtual surfaces of Zemax, with which we get the correction function (CF) of the obscuration induced error (OIE). Simulated results manifest that the proposed method can correct the OIE. Furthermore, an experiment setup is established with the same system parameters of the previous Zemax modeled system. The experiment results verify the effectiveness of the proposed method again. Our method can guarantee the precision of the ISO 12,233 slanted-edge method when an R-C collimator is chosen.
© 2021 Elsevier GmbH
Number of references:23
Main heading:Optical transfer function
Controlled terms:Cameras - Errors
Uncontrolled terms:Correction function - Experiment set-up - High resolution - ISO 12233 - Secondary mirror - Simulated results - Slanted-edge method - Space cameras
Classification code:741.1 Light/Optics - 742.2 Photographic Equipment
DOI:10.1016/j.ijleo.2021.166653

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210709913971
Title:Optimization of the focusing characteristics of Fresnel zone plates fabricated with a femtosecond laser
Authors:Zhou, Fang (1); Sun, Xiaoyan (1); Zhong, Hongmin (1); Duan, Lian (1); Hu, Youwang (1); Duan, Ji’an (1); Li, Ming (2)
Author affiliation:(1) State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electronic Engineering, Central South University, Changsha, China; (2) Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an, China
Corresponding author:Sun, Xiaoyan(sunxy@csu.edu.cn)
Source title:Journal of Modern Optics
Abbreviated source title:J. Mod. Opt.
Volume:68
Issue:2
Issue date:2021
Publication year:2021
Pages:100-107
Language:English
ISSN:09500340
E-ISSN:13623044
CODEN:JMOPEW
Document type:Journal article (JA)
Publisher:Taylor and Francis Ltd.
Abstract:In this research, amplitude Fresnel zone plates (FZPs) were fabricated on fused silica glass with femtosecond laser. The focusing characteristics including focal length, diffraction efficiency, geometric concentrator ratio, spot energy uniformity, depth of focus and resolution were studied by simulations and experiments. To optimize the focusing characteristics of FZP, we proposed an optimized machining process, an extended FZP and an fractal FZP. The optimized machining process increased the diffraction efficiency of the amplitude FZP from 6.96% to 8.14%, the extended FZP broke through the limit of minimum line width in processing and improved the resolution, and the fractal FZP increased the focus depth from 4 mm to 10 mm. In addition, we wrote a FZP on the end face of multi mode fiber, the divergent annular beam converged and formed an focus ring at the focal plane. This research will provide broad applications in fiber tweezers, beam coupling and optical communication.
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
Number of references:33
Main heading:Femtosecond lasers
Controlled terms:Diffraction efficiency - Fabrication - Focusing - Fractals - Fused silica - Machining - Machining centers - Optical fiber communication - Optical fiber coupling - Optical tweezers
Uncontrolled terms:Annular beams - Beam coupling - Broad application - Depth of focus - Focal lengths - Focal Plane - Fresnel zone plate - Machining Process
Classification code:603.1 Machine Tools, General - 604.2 Machining Operations - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics - 744.9 Laser Applications - 812.3 Glass - 921 Mathematics
Numerical data indexing:Percentage 6.96e+00% to 8.14e+00%, Size 4.00e-03m to 1.00e-02m
DOI:10.1080/09500340.2021.1879300

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210409830330
Title:Multisource Remote Sensing Data Classification With Graph Fusion Network
Authors:Du, Xingqian (1); Zheng, Xiangtao (2); Lu, Xiaoqiang (3); Doudkin, Alexander A. (4)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China (e-mail: xiangtaoz@gmail.com); (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.; (4) Laboratory of System Identification, United Institute of Informatics Problems of the National Academy of Sciences of Belarus, 220012 Minsk, Belarus, and also with the Department of Computers, Belarusian State University of Informatics and Radioelectronics (BSUIR), 220012 Minsk, Belarus.
Source title:IEEE Transactions on Geoscience and Remote Sensing
Abbreviated source title:IEEE Trans Geosci Remote Sens
Issue date:2021
Publication year:2021
Language:English
ISSN:01962892
E-ISSN:15580644
CODEN:IGRSD2
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:The land cover classification has been an important task in remote sensing. With the development of various sensors technologies, carrying out classification work with multisource remote sensing (MSRS) data has shown an advantage over using a single type of data. Hyperspectral images (HSIs) are able to represent the spectral properties of land cover, which is quite common for land cover understanding. Light detection and ranging (LiDAR) images contain altitude information of the ground, which is greatly helpful with urban scene analysis. Current HSI and LiDAR fusion methods perform feature extraction and feature fusion separately, which cannot well exploit the correlation of data sources. In order to make full use of the correlation of multisource data, an unsupervised feature extraction-fusion network for HSI and LiDAR, which utilizes feature fusion to guide the feature extraction procedure, is proposed in this article. More specifically, the network takes multisource data as input and directly output the unified fused feature. A multimodal graph is constructed for feature fusion, and graph-based loss functions including Laplacian loss and t-distributed stochastic neighbor embedding (t-SNE) loss are utilized to constrain the feature extraction network. Experimental results on several data sets demonstrate the proposed network can achieve more excellent classification performance than some state-of-the-art methods.
IEEE
Main heading:Data mining
Controlled terms:Classification (of information) - Extraction - Feature extraction - Graphic methods - Lithium compounds - Optical radar - Remote sensing - Spectroscopy - Stochastic systems
Uncontrolled terms:Classification performance - Extraction procedure - Land cover classification - Light detection and ranging - Multisource remote sensing data - Spectral properties - State-of-the-art methods - Stochastic neighbor embedding
Classification code:716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 723.2 Data Processing and Image Processing - 802.3 Chemical Operations - 961 Systems Science
DOI:10.1109/TGRS.2020.3047130

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210109715973
Title:An uncoupled theory of FG nanobeams with the small size effects and its exact solutions
Authors:Pei, Y.L. (1, 2); Li, L.X. (1)
Author affiliation:(1) State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an; Shaanxi; 710049, China; (2) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; Shaanxi; 710119, China
Corresponding author:Li, L.X.(luxianli@mail.xjtu.edu.cn)
Source title:Archive of Applied Mechanics
Abbreviated source title:Arch Appl Mech
Volume:91
Issue:4
Issue date:April 2021
Publication year:2021
Pages:1713-1728
Language:English
ISSN:09391533
E-ISSN:14320681
CODEN:AAMEEA
Document type:Journal article (JA)
Publisher:Springer Science and Business Media Deutschland GmbH
Abstract:

Due to unphysical coupling induced by the material inhomogeneity, FG (functionally graded) nanobeam problems were formulated in a very complex way so that they cannot be analytically solved. In this paper, an uncoupled theory is proposed for FG nanobeams considering their small size effects. First, with the aid of the neutral axis, the axial displacement is expressed in terms of generalized displacements for FG nanobeams. Based on the nonlocal strain gradient theory, the generalized stresses and strains are accordingly defined and uncoupled constitutive relations are derived. Based on the principle of virtual work, an uncoupled theory is eventually established, including governing equations and boundary conditions. Within the present framework, analytical solutions to FG nanobeams are obtained for the first time for general boundary conditions. These solutions not only re-evaluate the previous results but shed light on the small size effects of FG nanobeams.
© 2021, Springer-Verlag GmbH Germany, part of Springer Nature.
Number of references:54
Main heading:Nanowires
Controlled terms:Boundary conditions - Elasticity - Size determination - Strain - Structural design
Uncontrolled terms:Axial displacements - Constitutive relations - Functionally graded - General boundary conditions - Generalized displacements - Material inhomogeneity - Principle of virtual work - Strain gradient theory
Classification code:408.1 Structural Design, General - 761 Nanotechnology - 933 Solid State Physics - 951 Materials Science
DOI:10.1007/s00419-020-01849-2
Funding details: Number: 11672221,U20B2013, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by the National Natural Science Foundations of China (Grant Nos: U20B2013 and?11672221).This work was supported by the National Natural Science Foundations of China (Grant Nos: U20B2013 and 11672221).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210209741076
Title:Theoretical and Experimental Analysis of the Directional RI Sensing Property of Tilted Fiber Grating????(Open Access)
Authors:Sun, Yuezhen (1); Lu, Tean (1); Moreno, Yarien (1); Li, Liangye (1); Wang, Hushan (2); Zhou, Kaiming (3); Sun, Qizhen (1); Liu, Deming (1); Yan, Zhijun (1); Zhang, Lin (3)
Author affiliation:(1) School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'An Institute of Optics and Precision Mechanics, Xi'an, China; (3) Aston Institute of Photonic Technologies, Aston University, Birmingham, United Kingdom
Corresponding author:Yan, Zhijun(yanzhijun@hust.edu.cn)
Source title:Journal of Lightwave Technology
Abbreviated source title:J Lightwave Technol
Volume:39
Issue:2
Issue date:January 15, 2021
Publication year:2021
Pages:674-681
Article number:9210176
Language:English
ISSN:07338724
E-ISSN:15582213
CODEN:JLTEDG
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:In this article, we have theoretically and experimentally investigated the unique vector refractive index (RI) sensing property of tilted fiber grating (TFG). Due to the orthogonal symmetric grating structure, TFGs would mainly achieve the coupling between the fiber core mode and the two orthogonal polarization LP1m of cladding mode. And the numerical simulation results showed that the coupling coefficient between fundamental core mode to the LP1m cladding mode is higher than the others. In the experiment, we have furthermore observed the cladding mode field distribution of excessively TFG (Ex-TFG) and long period fiber grating (LPFG), which indicated that the evanescent field distribution of cladding mode of TFG shows an asymmetric near field distribution with two lobes oriented along the fast axis of TFG, and the one of LPFG has a circularly symmetric cladding mode field distribution. In addition, by employing side-immersion method, we have measured the azimuth RI sensitivities of Ex-TFG, tilted fiber Bragg grating (TFBG) and LPFG, which exhibited that both Ex-TFG and TFBG have shown a direction-dependency RI sensitivity, and the RI sensitivity with side-immersion along fast axis is almost half of the one along slow axis, and the RI sensitivity of LPFG is azimuth independent. Overall, the experiment results show that the TFGs inherently show unique directional RI sensing property, which could be potentially applied in vector sensing area.
© 1983-2012 IEEE.
Number of references:38
Main heading:Evanescent fields
Controlled terms:Cladding (coating) - Fiber Bragg gratings - Fibers - Refractive index
Uncontrolled terms:Coupling coefficient - Experimental analysis - Fundamental core mode - Long period fiber grating - Near-field distribution - Orthogonal polarizations - Tilted fiber Bragg grating - Tilted fiber gratings
Classification code:701 Electricity and Magnetism - 741.1 Light/Optics
DOI:10.1109/JLT.2020.3027947
Funding details: Number: 2019AAA053,2019AAA059, Acronym: -, Sponsor: -;Number: 61922033, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 2018CFA004, Acronym: -, Sponsor: Natural Science Foundation of Hubei Province;Number: 2018YFB2100902, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Manuscript received July 20, 2020; revised September 17, 2020; accepted September 28, 2020. Date of publication September 30, 2020; date of current version January 15, 2021. This work was supported in part by the National Science Fund for Excellent Young Scholars under Grant 61922033; in part by the National Key Research and Development Program of China under Grant 2018YFB2100902; in part by the Major Projects of Technical Innovation of Hubei under Grant 2019AAA053 and Grant 2019AAA059, and in part by the Creative Research Groups of the Nature Science Foundation of Hubei Province under Grant 2018CFA004. (Corresponding author: Zhijun Yan.) Yuezhen Sun, Tean Lu, Yarien Moreno, and Liangye Li are with the School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China (e-mail: yz_sun@hust.edu.cn; 547109009@qq.com; 3337198553@qq.com; liangyeli@hust.edu.cn).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20213310759591
Title:Semi-supervised LDA Based Method for Similarity Distance Metric Learning
Authors:Deng, Ren (1); Chen, Yaxuan (2); Han, Ruilin (1); Xiao, Han (1); Li, Xijie (3)
Author affiliation:(1) Amazingx Academy, China; (2) School of Computer Science, Wuhan Donghu University, Wuhan, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China
Source title:ACM International Conference Proceeding Series
Abbreviated source title:ACM Int. Conf. Proc. Ser.
Part number:1 of 1
Issue title:Proceedings of the 4th International Conference on Information Science and Systems, ICISS 2021
Issue date:March 17, 2021
Publication year:2021
Pages:97-101
Language:English
ISBN-13:9781450389136
Document type:Conference article (CA)
Conference name:4th International Conference on Information Science and Systems, ICISS 2021
Conference date:March 17, 2021 - March 19, 2021
Conference location:Virtual, Online, United kingdom
Conference code:170693
Publisher:Association for Computing Machinery
Abstract:

In recent years, computer vision technology has drawn much attention of people and been applied into many fields of human's living. Data classification/identification is a key task in computer vision. The similarity distance metric learning based method is wildly used to compare the similar positive pairs from dissimilar negative pairs. However, there are more and more challenging computer vision task have been proposed. Traditional similarity distance metric learning methods are fail to metric the similarity of these task due to the drastic variation of feature caused by illumination, view angle, pose and background changes. Thus, the existing methods are unable to learn effective and complete patterns to describe the appearance change of individuals. To overcome this problem, we proposed a novel semi-supervised (Linear Discriminant Analysis) LDA based method for similarity distance metric learning. The proposed method first learn a metric projection with traditional LDA method. The then test data are identified with the potential positive pairs to fine-turning the metric model by forcing the identified data to be close to the center of positive training data pairs. Finally, the proposed method are compared to some classic metric learning algorithms to demonstrate its effectiveness and accuracy.
© 2021 ACM.
Number of references:25
Main heading:Semi-supervised learning
Controlled terms:Computer vision - Discriminant analysis - Learning algorithms - Learning systems
Uncontrolled terms:Computer vision technology - Data classification - Fine turning - Linear discriminant analysis - Metric projection - Semi-supervised - Similarity distance - Training data
Classification code:723.5 Computer Applications - 922 Statistical Methods
DOI:10.1145/3459955.3460606

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211810306677
Title:Effect of melting atmospheres on the optical property of radiation-hard fluorophosphate glass
Authors:Y., Ma; H., Su; Z., Zhang; R., Wan; S., Li; B., Peng; P., Wang
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Physics & Information Technology, Shaanxi Normal University, Xi'an; 710000, China
Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)
Source title:Ceramics International
Abbreviated source title:Ceram Int
Volume:47
Issue:16
Issue date:August 15, 2021
Publication year:2021
Pages:22468-22477
Language:English
ISSN:02728842
CODEN:CINNDH
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

High-energy radiation in space and nuclear irradiation environment induces colour centres in optical glass, causing solarisation, and a serious condition can render optical systems and optical loads unusable. To develop space radiation-resistant optical glass, CeO2-stabilised radiation-hard fluorophosphate glass was prepared under three different atmospheres (nitrogen, oxygen, and ambient air). The glass-melting atmospheres' effects on the glass's transmission, defect formation, and structural changes before and after exposure to gamma radiation were investigated by a comprehensive study on their transmittance, absorption, and electron paramagnetic resonance spectra. Introducing a small amount of CeO2 (～0.34 wt%) into the fluorophosphate base glass converted NBO and BO into ABO in the glass network, red-shifted the UV absorption edge, and decreased the optical density increment by almost half after radiation. As the total dose of gamma radiation increased, the transmittance of the irradiated glass at a wavelength of 385 nm significantly increased due to absorption of POHC2 defects. After exposure to 250 k of rad gamma irradiation, the corresponding optical density increment per centimeter thickness at 385 nm of the radiation-hard fluorophosphate glass that melted in the nitrogen, oxygen, and air atmospheres decreased from 1.839 to 1.388 and 1.215. As it melted in air, the NBO ratio of the fluorophosphate glass reached the lowest level and the Ce4+ ratio in the glass was 92.49%, which helped suppress the generation of POHC, Fe3+, PO4-EC, and PO3-EC defects during the gamma irradiation process, improving the glass's radiation resistance.
© 2021 Elsevier Ltd and Techna Group S.r.l.
Number of references:61
Main heading:Defects
Controlled terms:Cerium oxide - Density (optical) - Gamma rays - Glass - Iron compounds - Irradiation - Melting - Nitrogen - Oxygen - Paramagnetic resonance - Radiation effects
Uncontrolled terms:$gamma@-radiation - CeO$-2$ - Fluorophosphate glass - Gamma irradiation - Glass melting atmosphere - Melting atmosphere - Optical- - Property - Radiation hard - Radiation resistance
Classification code:701.2 Magnetism: Basic Concepts and Phenomena - 741.1 Light/Optics - 802.3 Chemical Operations - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 812.3 Glass - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics - 951 Materials Science
Numerical data indexing:Percentage 9.249E+01%, Size 3.85E-07m
DOI:10.1016/j.ceramint.2021.04.256
Funding details: Number: XAB2016A08, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2021GY-251, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;Number: 11972313,61775235, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017446, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;
Funding text:This work is financially supported by the National Natural Science Foundation of China (NSFC No. 61775235 , 11972313 ), West Young Scholars Program of the Chinese Academy of Sciences ( XAB2016A08 ), Shaanxi Provincial Key Research and Development Program ( 2021GY-251 ), and Youth Innovation Promotion Association, CAS ( 2017446 ).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212210436960
Title:Remote Sensing Image Generation from Audio
Authors:Zheng, Zhiyuan (1, 2); Chen, Jun (1); Zheng, Xiangtao (2); Lu, Xiaoqiang (2)
Author affiliation:(1) National Engineering Research Center for Multimedia Software, School of Computer Science, Wuhan University, Wuhan; 430072, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)
Source title:IEEE Geoscience and Remote Sensing Letters
Abbreviated source title:IEEE Geosci. Remote Sens. Lett.
Volume:18
Issue:6
Issue date:June 2021
Publication year:2021
Pages:994-998
Article number:9094059
Language:English
ISSN:1545598X
E-ISSN:15580571
Document type:Journal article (JA)
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Generating image from other modal data has attracted much attention in cross-modal studies, since the generated image offers intuitive vision information. Unlike the previous works which generate an image from text, a novel task is introduced, generating an image from audio. However, semantic gap intrinsically exists in cross-modal data, which disturbs the generative results. In order to explore the relevance between the audio and image, a novel reranking audio-image translation method is proposed. The proposed method: 1) maps the audio and image into a uniform feature space; 2) designs an audio-audio matching network to match the related audio; and 3) adopts an audio-image matching network for every matched audio to generate a related image, and the most frequent image is voted as the final result. Extensive experiments on two remote sensing cross-modal data sets demonstrate that the proposed method can visualize the content of audio.
© 2004-2012 IEEE.
Number of references:16
Main heading:Remote sensing
Controlled terms:Modal analysis - Semantics - Space optics
Uncontrolled terms:Audio images - Audio matching - Cross-modal - Feature space - Matching networks - Remote sensing images - Semantic gap - Vision information
Classification code:656.1 Space Flight - 921 Mathematics
DOI:10.1109/LGRS.2020.2992324
Funding details: Number: 2017YFB0502900, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 61772510, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 61806193, Acronym: -, Sponsor: National Natural Science Foundation of China;Number: 61876135, Acronym: -, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61772510, and Grant 61876135, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, and in part by the CAS "Light of West China" Program under Grant XAB2017B26.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410174068
Title:A wide-band collimator with large field of view and low distortion
Authors:Zhang, Xuemin (1); Dai, Yidan (2); Song, Xing (1); Li, Hua (1)
Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics of CAS, New Industrial Park, Xi'an Hi-Tech Industrial Development Zone, NO.17 Xinxi Road, Xi'an,Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing; 100049, China
Corresponding author:Zhang, Xuemin
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11780
Part number:1 of 1
Issue title:Global Intelligent Industry Conference 2020
Issue date:2021
Publication year:2021
Article number:1178008
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643949
Document type:Conference article (CA)
Conference name:Global Intelligent Industry Conference 2020
Conference date:November 20, 2020 - November 21, 2020
Conference location:Guangzhou, China
Conference code:167976
Sponsor:Chinese Society for Optical Engineering
Publisher:SPIE
Abstract:

With the continuous development of aerospace and aviation, the field of view of the interferometric spectrometer is getting larger and larger, and the field of view of the interferometer also increases. In order to realize the precise adjustment of the interferometer, it is necessary to input the interferometer through a large field of view target to form a large array of interference fringes. In order to improve the measurement accuracy of interference fringes, the large field of view target with small distortion and small chromatic aberration is required to produce interference fringes with a large field of view, so it is necessary to design wide-band collimator with a large field of view to provide an object that meets the above characteristics. In this paper, we designed a collimator whose focal length of the system is 307mm, the field of view is ±12°, the working wavelength is 450nm~900nm,the effective aperture is F50mm. The diameter of the diffusion spot in each field of view is smaller than the diameter of the Ellie disk, reaching the diffraction limit, and the distortion correction is better than 2%. The transfer function is almost close to the diffraction limit, meeting the design requirements of the wide-band collimator with large field of view and low distortion.
© 2021 SPIE.
Number of references:5
Main heading:Aberrations
Controlled terms:Diffraction - Interferometers
Uncontrolled terms:Chromatic aberration - Continuous development - Diffraction limits - Distortion correction - Effective aperture - Interference fringe - Large field of views - Measurement accuracy
Classification code:941.3 Optical Instruments
Numerical data indexing:Percentage 2.00e+00%, Size 3.07e-01m
DOI:10.1117/12.2588832

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609892037
Title:Research on the Quantitative Analysis Method of Nitrate in Complex Water by Full Scale Spectrum With GS-SVR
Title of translation:精细全光谱结合GS-SVR的复杂水体硝酸盐分析方法研究
Authors:Lei, Hui-Ping (1, 2); Hu, Bing-Liang (1); Yu, Tao (1); Liu, Jia-Cheng (1); Li, Wei (1, 2); Wang, Xue-Ji (1); Zou, Yan (3); Shi, Qian (3)
Author affiliation:(1) Xi'an Institute of Optics and Precision Machanics, Chinese Academy Sciences, Xi'an; 710119, China; (2) Photoelectical Engineering Institute, University of Chinese Academy Sciences, Beijing; 100049, China; (3) Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao; 266000, China
Corresponding author:Yu, Tao(yutao@opt.ac.cn)
Source title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Abbreviated source title:Guang Pu Xue Yu Guang Pu Fen Xi
Volume:41
Issue:2
Issue date:February 2021
Publication year:2021
Pages:372-378
Language:Chinese
ISSN:10000593
CODEN:GYGFED
Document type:Journal article (JA)
Publisher:Science Press
Abstract:Nitrate is an important index of water quality monitoring. The high concentration of nitrate in water results in the decrease of biodiversity and the degradation of the ecosystem. Meanwhile, it will cause irreversible harm to human health. Water quality monitoring technology based on the spectrum is the trend of modern water environment monitoring. Compared with the traditional method, nitrate field sampling and laboratory analysis, it has the advantages of simple operation, no pretreatment, fast detection, good repeatability and no pollution. Due to the complexity and diversity of water components, there is a high degree of nonlinearity between water parameters and absorbance. Traditional linear regression prediction models are not applicable, such as single wavelength method, dual wavelength method and partial least square method. Therefore, this paper proposes a new method for the determination of nitrate in water by fine full spectrum combined with the improved variable step grid search algorithm optimized support vector regression (GS-SVR). In cooperation with the college of chemistry and chemical engineering of Shaanxi University of Science and Technology, 94 groups of solution samples with different concentrations were prepared according to different concentration gradients and the experimental requirements by using standard nitrate solution, platinum cobalt standard solution and formazine standard suspension. Firstly, the transmittance spectrum was converted to absorbance, and 94 solution samples were divided into 80 training sets and 14 test sets by Kennard stone algorithm. Secondly, the improved GS algorithm combined with 5-fold cross validation is used to optimize the parameters of SVR by reducing the search range and changing the search step for many times, and the optimal penalty parameters and kernel function width are used to build model, which is used to predict the test set. Meanwhile, the prediction results are compared with those of BPNN, SVR, GS-SVR, PSO-SVR and GA-SVR. The results show that the coefficient of determination R2=0.993 5, root means square of prediction RMSEP=0.043 5. The optimal parameters are (512, 0.044 2), and the average training time is 13 s. Compared with the above five prediction models, R2 increased by 1.22%, 11.66%, 0.78%, 0.74%, 0.77%, training efficiency increased by 4.15 times (BPNN), 8.30 times (GS-SVR), 21.38 times (PSO-SVR), 10.23 times (GA-SVR). The prediction accuracy and training efficiency of the model has been greatly improved, which provides a novel approach basis for rapid and real-time online monitoring of nitrate concentration in the complex water body. This method is also suitable for the establishment prediction models of other water quality parameters.
© 2021, Peking University Press. All right reserved.
Number of references:11
Main heading:Water pollution
Controlled terms:Biodiversity - Efficiency - Forecasting - Genetic algorithms - Least squares approximations - Nitrates - Predictive analytics - Spectrum analysis - Support vector regression - Suspensions (fluids) - Water quality
Uncontrolled terms:Coefficient of determination - Concentration gradients - Degree of non-linearity - Experimental requirements - Kennard-Stone algorithm - Partial least square methods - Water quality monitoring - Water quality parameters
Classification code:445.2 Water Analysis - 453 Water Pollution - 454 Environmental Engineering - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 913.1 Production Engineering - 921.6 Numerical Methods
Numerical data indexing:Percentage 1.17e+01%, Percentage 1.22e+00%, Percentage 7.40e-01%, Percentage 7.70e-01%, Percentage 7.80e-01%, Time 1.30e+01s
DOI:10.3964/j.issn.1000-0593(2021)02-0372-07

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210809943896
Title:Infrared and visible image fusion based on weighted variance guided filter and image contrast enhancement
Authors:Ren, Long (1, 2, 3); Pan, Zhibin (2, 5, 6); Cao, Jianzhong (1); Liao, Jiawen (1, 2, 3); Wang, Yang (4, 5)
Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Faculty of Electronics and Communications, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Information Science, Xi'an University of Technology, Xi'an; 710048, China; (5) Research Institute of Xi'an Jiaotong University, Zhejiang; 311215, China; (6) State Key Laboratory of Novel Software Technology, Nanjing University, Nanjing, China
Corresponding author:Ren, Long(renlong513@stu.xjtu.edu.cn)
Source title:Infrared Physics and Technology
Abbreviated source title:Infrared Phys Technol
Volume:114
Issue date:May 2021
Publication year:2021
Article number:103662
Language:English
ISSN:13504495
CODEN:IPTEEY
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:With extraordinary advances in sensor technology, infrared and visible image fusion has been widely used in both military and civilian applications. In this paper, we propose a novel image fusion method based on decomposition and division based strategy. The proposed method improves the guided filter to better decompose images and restrict artifacts around image boundaries. Furthermore, because the quality of visible images is easily affected by low light conditions and noises, it is necessary to enhance the contrast of visible images to improve the visual quality before applying image fusion. Subsequently, we divide the infrared and visible image into several sub-images in vertical direction, because there is more similar image content in this direction such as the sky and land. Additionally, each sub-image is decomposed into a base layer and a detail layer. Different from previous methods, the fusion in our proposed method is executed by two different strategies, one takes the sub infrared base layer as the main image to get the fusion result, while the other one takes the sub visible base layer as the main image, and two different sub-fusion results are obtained. We also propose a new fusion strategy called gradient-brightness criterion to adaptively output the final fused image. As a result, the fused image preserves more details of visible image and clearer infrared objects at the same time, which is well suited for human visual perception. Experimental results indicate that our proposed method achieves a superior performance compared with previous fusion methods in both subjective and objective assessments.
© 2021 Elsevier B.V.
Number of references:47
Main heading:Image enhancement
Controlled terms:Image fusion - Military applications - Military photography
Uncontrolled terms:Human visual perception - Image contrast enhancement - Image fusion methods - Infrared and visible image - Low light conditions - Objective assessment - Sensor technologies - Vertical direction
Classification code:404.1 Military Engineering - 723.2 Data Processing and Image Processing
DOI:10.1016/j.infrared.2021.103662
Funding details: Number: -, Acronym: XJTU, Sponsor: Xi’an Jiaotong University;Number: 2020GY-005, Acronym: -, Sponsor: Key Science and Technology Program of Shaanxi Province;Number: KFKT2019B26, Acronym: NJU, Sponsor: Nanjing University;Number: -, Acronym: -, Sponsor: State Key Laboratory of Novel Software Technology;Number: 2018225, Acronym: -, Sponsor: -;
Funding text:This work was supported by the major Science Program of Research Institute of Xi’an Jiaotong University from Xiaoshan District, Hangzhou, Zhejiang under Grand No.2018225, the Open Project Program of State Key Laboratory of Novel Software Technology (Nanjing University) (Grant No. KFKT2019B26) and the Key Science and Technology Program of Shaanxi Province (Grant No. 2020GY-005).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211110075432
Title:Investigation on secondary electron emission characteristics of double-layer structures????(Open Access)
Authors:Wang, Dan (1); He, Yongning (1); Guo, Junjiang (2, 3, 4); Cai, Yahui (1); Mao, Zhangsong (1); Ye, Ming (1)
Author affiliation:(1) School of Microelectronics, Xian Jiaotong University, Xian; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China; (3) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, School of Electronics and Information Engineering, Xian Jiaotong University, Xian; 710049, China; (4) University of Chinese Academy of Sciences (UCAS), Beijing; 100049, China
Corresponding author:He, Yongning(yongning@mail.xjtu.edu.cn)
Source title:Journal of Applied Physics
Abbreviated source title:J Appl Phys
Volume:129
Issue:9
Issue date:March 7, 2021
Publication year:2021
Article number:093304
Language:English
ISSN:00218979
E-ISSN:10897550
CODEN:JAPIAU
Document type:Journal article (JA)
Publisher:American Institute of Physics Inc.
Abstract:Secondary electron (SE) emission (SEE) from material surfaces is a frequent phenomenon in space and vacuum environments. SEE modulation is important since it governs the performance of some devices such as electronic multipliers or induces some detrimental effects such as multipactors. Surface coating has been reported to modulate SEE effectively, whereas SEE behaviors of coating structures are not clearly understood yet, and the appropriate theory to describe SEE characteristics quantitatively for coating structures is less developed so far. Here, we have prepared four alumina coatings possessing various thicknesses to research the SEE characteristics of coating structures and have shown how the coating thickness affects the SEE behaviors. Besides, by considering coating/substrate as an ideal double-layer structure, we have derived several equations to describe the producing, transmitting, and escaping processes of excited inner SEs and finally constructed a unidimensional SEE model for double-layer structures. The model is applicable to reveal the dependence of trueSE yield (TSEY) on the top and bottom layers' physical properties and estimate TSEY proportions contributed by the top and bottom layers at random energy points. By employing the concept, SEE characteristics of Al2O3/Si, MgO/Si, and TiO2/Si double-layer structureshave been quantitatively interpreted. Moreover, the abnormal SEY curve with a double-hump shape, which is induced by the peak position distinction of SiO2/Si structures, can also be explained. This work is of great significance to comprehend TSEY modulating regularities of various double-layer structures applied in surface engineering.
© 2021 Author(s).
Number of references:31
Main heading:Coatings
Controlled terms:Alumina - Aluminum oxide - Magnesia - Oxide minerals - Secondary emission - Silica - Silicon - Thickness measurement - Titanium dioxide
Uncontrolled terms:Coating structures - Coating thickness - Double layer structure - Secondary electron emissions - Secondary electrons - Surface coatings - Surface engineering - Vacuum environment
Classification code:482.2 Minerals - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 804.2 Inorganic Compounds - 813.2 Coating Materials - 943.2 Mechanical Variables Measurements
DOI:10.1063/5.0023325

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Bronze

Accession number:20210509874631
Title:Optical system design of polarization imaging spectrometer based on aperture division
Authors:Chang, Lingying (1); Pan, Qian (1); Qiu, Yuehong (2); Zhao, Baochang (2)
Author affiliation:(1) Xi'an University of Post and Telecommunications, Xian; 710121, China; (2) Xian Institute Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China
Corresponding author:Chang, Lingying(sophia_chang@126.com)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:117611K
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:Based on the principle of acousto-optic tunable filter and aperture division, the new method that can obtain a high spectral full polarization and image information was proposed. It was improved the accuracy of target detection and object recognition by this method. The Optical system of polarization imaging spectrometer based on aperture divisionandacousto-optic tunable filter was designed in this paper, which was used in the 2.16-meter telescope and spectral range is 450-900 nm.First,the working principle of polarization imaging spectrometer based on aperture division was introduced.Then, the design scheme of optical system and the principle of information acquisition were studied.Finally, the design parameters were assigned and theoptical systems were designed.The whole system MTF reach 0.6 in 32lp/mm.The olarization imaging spectrometer based on aperture division can improve the observation capacity.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:12
Main heading:Optical systems
Controlled terms:Object detection - Object recognition - Photonics - Polarization - Spectrometers
Uncontrolled terms:Acousto-optic tunable filters - Design parameters - Full polarization - Image information - Imaging spectrometers - Information acquisitions - Polarization imaging - Tunable filters
Classification code:723.2 Data Processing and Image Processing - 741.3 Optical Devices and Systems
Numerical data indexing:Size 2.16e+00m
DOI:10.1117/12.2586810

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204409417426
Title:Analysis of corrected Cerenkov emission during electron radiotherapy by Monte Carlo method
Authors:Li, Yi (1, 2, 4); Liu, Hongjun (1, 3); Huang, Nan (1); Wang, Zhaolu (1); Zhang, Chunmin (2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Physics, Xi'an Jiaotong University, Xi'an; 710049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (4) University of Chinese Academy of Science, Beijing; 100084, China
Corresponding author:Liu, Hongjun(liuhongjun@opt.ac.cnemailzcm@xjtu.edu.cn)Zhang, Chunmin(zcm@xjtu.edu.cn)
Source title:Applied Radiation and Isotopes
Abbreviated source title:Appl. Radiat. Isot.
Volume:168
Issue date:February 2021
Publication year:2021
Article number:109481
Language:English
ISSN:09698043
E-ISSN:18729800
CODEN:ARISEF
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:Cerenkov emission during electron radiotherapy had been emerging as a new dose assessment approach for clinical radiotherapy and could be imaged through a standard commercial camera. The purpose of this work aimed to study the accuracy of corrected Cerenkov emission method during electron radiotherapy by Monte Carlo (MC) method. GAMOS MC software was used to model the physics of electron therapy and calculated dose and Cerenkov photon distribution in water phantom. Compared to ionization chamber and diode measurement, MC simulated dose discrepancy was less than 1% in percentage depth dose (PDD) curves and less than. 2% in crossline profile curves, which was acceptable for clinical criterion. Compared to ionization chamber dose measurement, MC simulated Cerenkov discrepancy was less than 2% in crossline profile distribution, which was acceptable for clinical criterion. However, the Cerenkov PDD curves tended to overestimate the dose at the build-up region and underestimate the dose at the remaining attenuation region. After increasing the Cerenkov distribution depth to 2–3 mm, the discrepancy became well within 1% at the remaining attenuation region, which was acceptable for clinical criterion. Therefore, corrected Cerenkov emission could be used to assess PDD accuracy and crossline profile accuracy during electron radiotherapy.
© 2020 Elsevier Ltd
Number of references:27
Main heading:Monte Carlo methods
Controlled terms:Electron emission - Electrons - Ionization - Ionization chambers - Radiotherapy
Uncontrolled terms:Cerenkov photons - Clinical radiotherapy - Diode measurements - Dose assessments - Dose measurement - Emission method - Profile accuracies - Profile distributions
Classification code:461.6 Medicine and Pharmacology - 802.2 Chemical Reactions - 922.2 Mathematical Statistics
Numerical data indexing:Percentage 1.00e+00%, Percentage 2.00e+00%
DOI:10.1016/j.apradiso.2020.109481
Funding details: Number: 41530422,QNLM2016ORP0111, Acronym: -, Sponsor: -;Number: 2012AA121101, Acronym: -, Sponsor: -;Number: 11604377,61775234,61975232, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by following financial programs. The National Natural Science Foundation of China ( 61975232 , 61775234 , 11604377 ), Qingdao National Laboratory supported this work for Marine Science and Technology of China ( QNLM2016ORP0111 ), The Key Program of National Natural Science Foundation of China ( 41530422 ), National High Technology Research and Development Program of China (Program 863) ( 2012AA121101 ). We thank Varian Company for providing machine information.This work was supported by following financial programs. The National Natural Science Foundation of China (61975232, 61775234, 11604377), Qingdao National Laboratory supported this work for Marine Science and Technology of China (QNLM2016ORP0111), The Key Program of National Natural Science Foundation of China (41530422), National High Technology Research and Development Program of China (Program 863) (2012AA121101). We thank Varian Company for providing machine information. All authors in this study and many colleagues helped to collect and analyze data. Their support and helps should be appreciated.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20204709521265
Title:The mutual influence between rare earth element doping and femtosecond laser-induced effects in Ga-As-Sb-S chalcogenide glass
Authors:Liu, Lutao (1, 2); Chen, Fengyi (3); Cui, Jian (1, 2); Xiao, Xusheng (1); Xu, Yantao (1, 2); Hou, Chaoqi (1, 2); Cui, Xiaoxia (1, 2); Guo, Haitao (1, 2, 4)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Centre for Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences (UCAS), Beijing; 100049, China; (3) School of Physics, Northwest University, Xi'an; Shaanxi; 710069, China; (4) Collaborative Innovation Centre of Extreme Optics, Shanxi University, Taiyuan; Shanxi; 030006, China
Corresponding author:Guo, Haitao(guoht_001@opt.ac.cn)
Source title:Ceramics International
Abbreviated source title:Ceram Int
Volume:47
Issue:5
Issue date:March 1, 2021
Publication year:2021
Pages:6388-6396
Language:English
ISSN:02728842
CODEN:CINNDH
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:Femtosecond laser-induced damage thresholds (LIDTs) of Ga0.8As29.2Sb10S60 glasses doped with gradient Tm3+ concentrations and the effects of laser-induced damage on the glass' luminescence properties were studied in this work. Tm3+ doping in the glass considerably decreased the LIDT, from 3394.8 to 1881.8 mJ/cm2, when the Tm3+ concentration increased from 0 to 5000 ppmw. This was related to the absorption of Tm3+ around the femtosecond laser's wavelength and microstructural changes caused by the Tm3+ doping. On the other hand, the femtosecond laser changed the glass matrix's elemental distribution and microstructure. Although the laser damaged the glass, the luminescence properties were barely affected. Based on the changes, femtosecond laser damage mechanism of chalcogenide glass doped with rare earth element was firstly proposed.
© 2020
Number of references:51
Main heading:Femtosecond lasers
Controlled terms:Antimony compounds - Chalcogenides - Gallium compounds - Glass - Laser damage - Luminescence of inorganic solids - Rare earth elements - Rare earths - Thulium compounds
Uncontrolled terms:Chalcogenide glass - Elemental distribution - Femtoseconds - Glass matrices - Laser induced damage thresholds - Luminescence properties - Microstructural changes - Rare-earth element doping
Classification code:547.2 Rare Earth Metals - 744.8 Laser Beam Interactions - 804.2 Inorganic Compounds - 812.3 Glass
DOI:10.1016/j.ceramint.2020.10.219
Funding details: Number: 2019JQ-236,2019JM-113, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;Number: JCTD-2018-19, Acronym: -, Sponsor: -;Number: IOSKL2020KF11, Acronym: SKLIOE, Sponsor: State Key Laboratory on Integrated Optoelectronics;Number: 61935006,62005312, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This study was financially supported by the National Natural Science Foundation of China (No. 61935006 , 62005312 ), CAS Interdisciplinary Innovation Team Project ( JCTD-2018-19 ), and the Natural Science Basic Research Project in Shaanxi Province ( 2019JM-113 , 2019JQ-236 ), Open Fund of the State Key Laboratory of Integrated Optoelectronics ( IOSKL2020KF11 ). The authors thank Mr. Junjiang Guo for assistance with the experiments.

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310151897
Title:Indium selenide saturable absorber for high-energy nanosecond Q-switched pulse generation
Authors:Li, Lu (1); Wang, Yao (1); Jin, Wei (1); Zhao, Qiyi (1); Su, Yulong (2)
Author affiliation:(1) School of Science, Xi’an University of Posts and Telecommunications, Xi’an; 710121, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi’an; 710119, China
Corresponding author:Li, Lu(liluyoudian@163.com)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:2
Issue date:January 10, 2021
Publication year:2021
Pages:427-432
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:As a kind of III/VI group compound 2D layered material, indium selenide (In2Se3) has attracted tremendous interest because of its favorable optoelectronic characteristics. Here, magnetron sputtering deposition (MSD) technology was employed to prepare an In2Se3-based saturable absorber (SA). The nonlinear optical properties of this SA, whose modulation depth (1T) is 6.18%, were studied. With the aid of its saturable absorption, a stable two-wavelength Q-switching Er-doped fiber (EDF) laser was established. When pump power was adjusted to 900 mW, the output power was increased to 63.84 mW. The shortest pulse duration and maximum pulse energy were estimated to be 556 ns and 376 nJ, respectively. The signal-to-noise ratio of 70 dB proves this fiber laser has high stability. In comparison with previous works, the laser performance in this study is improved significantly. These results indicate that the In2Se3 holds promise as an outstanding candidate for high-energy pulse generation and will advance the development of In2Se3-based nonlinear photonics devices.
© 2021 Optical Society of America
Number of references:49
Main heading:Ultrafast lasers
Controlled terms:Fiber lasers - Indium compounds - Nonlinear optics - Optical properties - Q switching - Saturable absorbers - Selenium compounds - Semiconductor quantum wells - Signal to noise ratio
Uncontrolled terms:High energy pulse - Laser performance - Magnetron-sputtering deposition - Non-linear optical properties - Nonlinear photonics - Optoelectronic characteristics - Q-switched pulse - Saturable absorption
Classification code:714.2 Semiconductor Devices and Integrated Circuits - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 744 Lasers
Numerical data indexing:Decibel 7.00e+01dB, Energy 3.76e-07J, Magnetic_Flux_Density 1.00e+00T, Percentage 6.18e+00%, Power 6.38e-02W, Power 9.00e-01W, Time 5.56e-07s
DOI:10.1364/AO.414750
Funding text:Science Research Foundation of the Education Department of Shaanxi Province, China (19JK0811); Young Talent fund of University Association for Science and Technology in Shaanxi, China (20190113); Natural Science Foundation of Shaanxi Province (2019JM-131, 2019JQ-446); National Natural Science Foundation of China (12075190).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010346866
Title:Effective strategy to achieve a metal surface with ultralow reflectivity by femtosecond laser fabrication
Authors:Li, Xun (1, 2); Li, Ming (1); Liu, Hongjun (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Li, Ming(liming@opt.ac.cnemailliuhongjun@opt.ac.cn)Liu, Hongjun(liuhongjun@opt.ac.cn)
Source title:Chinese Optics Letters
Abbreviated source title:Chin. Opt. Lett.
Volume:9
Issue:5
Issue date:April 10, 2021
Publication year:2021
Article number:051401
Language:English
ISSN:16717694
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

An effective and simple method is proposed for fabricating the micro/nano hybrid structures on metal surfaces by adjusting femtosecond laser fluence, scanning interval, and polarization. The evolution of surface morphology with the micro/nano structures is discussed in detail. Also, the mechanism of light absorption by the micro/nano hybrid structures is revealed. Compared with the typical periodic light-absorbing structures, this type of micro/nano hybrid structures has an ultralow average reflectivity of 2% in the 250–2300 nm spectral band and the minimum 1.5% reflectivity in UV band. By employing this method, large areas of the micro/nano hybrid structures with high consistency could be achieved.
© 2021 Chinese Optics Letters
Number of references:38
Main heading:Femtosecond lasers
Controlled terms:Fabrication - Light absorption - Morphology - Reflection - Surface morphology
Uncontrolled terms:Absorbing structure - Hybrid structure - Metal surfaces - Micro/nano - Micro/nanostructures - Scanning intervals - SIMPLE method - Spectral band
Classification code:741.1 Light/Optics - 951 Materials Science
Numerical data indexing:Percentage 1.50e+00%, Percentage 2.00e+00%
DOI:10.3788/COL202119.051401
Funding details: Number: 2018YFB1107404, Acronym: -, Sponsor: Key Technologies Research and Development Program;Number: 2018zdzx01-03-01, Acronym: -, Sponsor: National Major Science and Technology Projects of China;Number: S2019-YF-ZDCXL-ZDLGY-0253, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;Number: S2020-YFZDCXL-ZDLGY-0021, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;
Funding text:This work was supported by the National Key R&D Program (No. 2018YFB1107404), the Major Scientific and Technological Projects in Shaanxi Province (No. 2018zdzx01-03-01), and the Key Research and Development Program of Shaanxi Province (Nos. S2019-YF-ZDCXL-ZDLGY-0253 and S2020-YFZDCXL-ZDLGY-0021).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010355746
Title:Application and Research of NaYF4:Yb3+/Eu3+ Upconverting Luminescent Micro-Nano Particles in Anti-Counterfeiting Identification
Title of translation:NaYF4:Yb3+/Eu3+上转换发光微纳粒子在防伪识别中的应用研究
Authors:Wang, Chong (1); Mo, Jian-Ye (1, 2); Li, Dong-Dong (1); She, Jiang-Bo (2); Liu, Zhen (2)
Author affiliation:(1) School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Source title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Abbreviated source title:Guang Pu Xue Yu Guang Pu Fen Xi
Volume:41
Issue:5
Issue date:May 2021
Publication year:2021
Pages:1525-1529
Language:Chinese
ISSN:10000593
CODEN:GYGFED
Document type:Journal article (JA)
Publisher:Science Press
Abstract:

Rare earth doped upconversion luminescent micro-nano particles have great application prospects in anti-counterfeit identification. First of all, in the article NaYF4:Yb3+/Eu3+ micro-nano particles prepared by hydrothermal synthesis method, The size, morphology and crystallinity of NaYF4:Yb3+/Eu3+ micro-nano particles were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope, and the luminescence properties of NaYF4:Yb3+/Eu3+ micro-nano particles were analyzed using a 980 nm pump source; Secondly, NaYF4:Yb3+/Eu3+ micro-nano particles and alcohol were mixed in a certain proportion to make a screen printing agent and combined with a network-customized screen template, different anti-counterfeit patterns were printed on the paper. After air drying, the words were exposed to a 980 nm laser and camera were used to study it. Finally, the printed words were divided into two parts, one was stored indoors at a constant temperature of 25℃, and the other was stored in the outdoor natural environment in January in winter. The storage locations are all Xi'an. After one week, in different environments the words were again tested with the same experimental instruments for imaging. The experiment and test results show that the diffraction peak of NaYF4:Yb3+/Eu3+ micro-nano particles is a completely consistent standard card of NaYF4, and no other impurities are generated. In this experiment, The synthesized micro-nano particles are all hexagonal in shape, and the average length and cross-sectional width are 209 and 175 nm respectively. The surface of the nanocrystal is smooth, defect-free, unbent, with high crystallinity and good dispersion. The electron diffraction ring corresponds to the 312, 300, and 302 crystal planes of NaYF4:Yb3+/Eu3+ micro-nano particles. NaYF4:Yb3+/Eu3+ micro-nano particles are affected by doped ions, it produces four visible lights of blue, green, yellow and red by different energy level transitions. Through fluorescence spectrum analysis of NaYF4:Yb3+/Eu3+ micro-nano particles. The asymmetry ratio of Eu3+ ion is about 1. This result shows that the magnetic dipole transition is equivalent to the electric dipole transition. Screen printing agent of NaYF4:Yb3+/Eu3+ micro-nano particles are good in different environments, the results are clear and easy to identify. However, affected by the storage environment, The results of indoor imaging have not changed much from the original imaging results. All characters of outdoor imaging are affected by moisture in the natural environment, the brightness is slightly reduced, but they can still be recognized. The imaging results show that the prepared NaYF4:Yb3+/Eu3+ micro-nano particles have the characteristics of stability and reliability in anti-counterfeiting identification, but they are still affected by natural environmental factors with a controllable degree. On the whole, it has great application prospects in anti-counterfeiting identification.
© 2021, Peking University Press. All right reserved.
Number of references:16
Main heading:Nanoparticles
Controlled terms:Crime - Crystal impurities - Crystallinity - Hydrothermal synthesis - Luminescence - Morphology - Particle size analysis - Rare earths - Scanning electron microscopy - Screen printing - Spectrum analysis - Transmission electron microscopy
Uncontrolled terms:Cross sectional width - Electric dipole transition - Energy level transitions - Fluorescence spectrum analysis - Luminescence properties - Magnetic dipole transition - Natural environmental factors - Stability and reliabilities
Classification code:741.1 Light/Optics - 745.1 Printing - 761 Nanotechnology - 802.2 Chemical Reactions - 804.2 Inorganic Compounds - 933 Solid State Physics - 933.1.1 Crystal Lattice - 951 Materials Science - 971 Social Sciences
Numerical data indexing:Size 1.75e-07m, Size 2.09e-07m, Size 9.80e-07m
DOI:10.3964/j.issn.1000-0593(2021)05-1525-05

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213810904182
Title:Near-infrared image recovery based on modulation instability in CdZnTe:V
Authors:Liao, Yuan (1, 2); Wang, Zhaolu (1); Huang, Nan (1); Liu, Hongjun (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100084, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Liu, Hongjun(liuhongjun@opt.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:20
Issue date:September 27, 2021
Publication year:2021
Pages:31145-31155
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We propose a near-infrared image recovery method based on modulation instability in the photorefractive semiconductor CdZnTe:V. The formation mechanism of modulation instability in CdZnTe:V is discussed, and the theoretical gain model is derived. Theoretical results of optical image recovery at 1 µm and 1.5 µm wavelengths demonstrate that the maximum cross-correlation gain is 2.6 with a signal to noise intensity ratio of 0.1. These results suggest that our method could be one of potential aids for near-infrared imaging.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Number of references:41
Main heading:Infrared devices
Controlled terms:Geometrical optics - II-VI semiconductors - Modulation - Optical correlation - Signal to noise ratio - Thermography (imaging)
Uncontrolled terms:Formation mechanism - Maximum cross correlations - Modulation instabilities - Near- infrared images - Near-infrared imaging - Optical image - Photo-refractive - Signal to noise
Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 742.1 Photography
DOI:10.1364/OE.438061

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212210422607
Title:Magneto-optically reorientation-induced image reconstruction in bulk nematic liquid crystals????(Open Access)
Authors:ZHANG, YONGBIN (1, 2); WANG, ZHAOLU (1); HUANG, NAN (1); LIU, HONGJUN (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (3) University of Chinese Academy of Sciences, Beijing; 100084, China
Corresponding author:LIU, HONGJUN(liuhongjun@opt.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:11
Issue date:May 24, 2021
Publication year:2021
Pages:17581-17590
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We theoretically propose the magneto-optically reorientation-induced image reconstruction in bulk nematic liquid crystals (NLCs). The underlying signals are reinforced and recovered at the expense of scattering noise under reorientation-induced self-focusing nonlinearity. The intensity perturbation gain is derived and the numerical results are presented to show the response of NLC molecules to the diffusive images. The nonlinear image recovery is influenced by the input light intensity, the magnetic field direction, and the correlation length. The results suggest an alternative approach to detect noisy images and promote the application of NLCs in image processing.
© 2021 Optical Society of America.
Number of references:34
Main heading:Image reconstruction
Controlled terms:Nematic liquid crystals
Uncontrolled terms:Bulk nematic - Correlation lengths - Image recovery - Input light - Magnetic field direction - Numerical results - Scattering noise - Self-focusing
DOI:10.1364/OE.425642
Funding details: Number: 61775234,61975232, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (61775234, 61975232).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20213610874252
Title:Terahertz photoconductive antenna based on antireflection dielectric metasurfaces with embedded plasmonic nanodisks
Authors:Jiang, Xiao-Qiang (1, 2); Fan, Wen-Hui (1, 2, 3); Song, Chao (1); Chen, Xu (1); Wu, Qi (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Fan, Wen-Hui(fanwh@opt.ac.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:26
Issue date:September 10, 2021
Publication year:2021
Pages:7921-7928
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

By taking advantage of dielectric metasurfaces and plasmonic nanostructures, a terahertz photoconductive antenna (THz-PCA) is proposed and investigated in detail. The designed dielectric metasurfaces can reduce the optical reflection down to 1.4% and accelerate the switching process (electric conductive to resistive) that broadens the THz spectrum emitted from THz-PCA. Simultaneously, the embedded plasmonic nanostructures can realize 11.2 times enhancement in local electric field without affecting the switching process and the damage threshold of the THz-PCA. Simulated results indicate that the proposed THz-PCA is 70.56 times stronger in THz radiation power than that of the traditional THz-PCA. The significant enhancement ensures the proposed THz-PCA has great prospects in promoting THz technology based on the THz-PCA.
© 2021 Optical Society of America
Number of references:41
Main heading:Terahertz waves
Controlled terms:Antennas - Electric fields - Nanostructures - Photoconductivity - Plasmonics
Uncontrolled terms:Anti-reflection - Damage threshold - Local electric field - Optical reflection - Photoconductive antennas - Plasmonic nanostructures - Simulated results - Switching process
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 711 Electromagnetic Waves - 761 Nanotechnology - 933 Solid State Physics
Numerical data indexing:Percentage 1.40e+00%
DOI:10.1364/AO.431678
Funding details: Number: 61675230, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61905276, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (61675230, 61905276); Natural Science Foundation of Shaanxi Province (2020JQ-437).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310450853
Title:Accuracy-enhanced coherent Ising machine using the quantum adiabatic theorem????(Open Access)
Authors:Li, Lin (1, 2); Liu, Hongjun (1, 3); Huang, Nan (1); Wang, Zhaolu (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100084, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Liu, Hongjun(liuhongjun@opt.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:12
Issue date:June 7, 2021
Publication year:2021
Pages:18530-18539
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

The coherent Ising machine (CIM) implemented by degenerate optical parametric oscillator (DOPO) networks is a novel optical platform to accelerate computation of hard combinatorial optimization problems. Nevertheless, with the increase of the problem size, the probability of the machine being trapped by local minima increases exponentially. According to the quantum adiabatic theorem, a physical system will remain in its instantaneous ground state if the time-dependent Hamiltonian varies slowly enough. Here, we propose a method to help the machine partially avoid getting stuck in local minima by introducing quantum adiabatic evolution to the ground-state-search process of the CIM, which we call A-CIM. Numerical simulation results demonstrate that A-CIM can obtain improved solution accuracy in solving MAXCUT problems of vertices ranging from 10 to 2000 than CIM. The proposed machine that is based on quantum adiabatic theorem is expected to solve optimization problems more correctly.
© 2021 Optical Society of America.
Number of references:49
Main heading:Quantum theory
Controlled terms:Combinatorial optimization - Computation theory - Ground state - Hamiltonians - Optical parametric oscillators - Optimization
Uncontrolled terms:Adiabatic evolution - Combinatorial optimization problems - Degenerate optical parametric oscillators - Optical platforms - Optimization problems - Quantum adiabatic theorem - Solution accuracy - Time-dependent Hamiltonians
Classification code:721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 921.5 Optimization Techniques - 931.4 Quantum Theory; Quantum Mechanics
DOI:10.1364/OE.426476
Funding details: Number: 61775234,61975232, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (61775234, 61975232).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20212410479921
Title:Enhanced optical absorption surface of titanium fabricated by a femtosecond laser assisted with airflow pressure
Authors:Li, Xun (1, 3); Li, Ming (1); Liu, Hongjun (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Li, Ming(liming@opt.ac.cnemailliuhongjun@opt.ac.cn)Liu, Hongjun(liuhongjun@opt.ac.cn)
Source title:Chinese Optics Letters
Abbreviated source title:Chin. Opt. Lett.
Volume:19
Issue:9
Issue date:September 2021
Publication year:2021
Article number:091404
Language:English
ISSN:16717694
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We propose an effective way to achieve an enhanced optical absorption surface of titanium alloy 7 (Ti7) fabricated by a femtosecond (fs) laser assisted with airflow pressure. The effect of laser scanning speed and laser power on the surfaces' morphology and average reflectivity was studied. In order to further reduce the surface's reflectivity, different airflow pressure was introduced during the fabrication of Ti7 by a fs laser. Furthermore, the average reflectivity of samples fabricated under different laser parameters assisted with airflow was presented. In addition, the high and low temperature tests of all samples were performed to test the stability performance of the hybrid micro/nanostructures in extreme environments. It is demonstrated that the airflow pressure has an important influence on the micro/nanostructures for light trapping, the average reflectivity of which could be as low as 2.31% over a broad band of 250-2300 nm before high and low temperature tests, and the reflection for specific wavelengths can go below 1.5%.
© 2021 OSA - The Optical Society. All rights reserved.
Number of references:45
Main heading:Femtosecond lasers
Controlled terms:Fabrication - Light absorption - Morphology - Reflection - Temperature - Titanium alloys
Uncontrolled terms:Broad bands - Extreme environment - Femtosecond (fs) laser - Laser parameters - Laser scanning speed - Light-trapping - Micro/nanostructures - Stability performance
Classification code:542.3 Titanium and Alloys - 641.1 Thermodynamics - 741.1 Light/Optics - 951 Materials Science
Numerical data indexing:Percentage 1.50e+00%, Percentage 2.31e+00%, Size 2.50e-07m to 2.30e-06m
DOI:10.3788/COL202119.091404

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110707030
Title:A Comprehensive Review on Parallel Phase-shifting Digital Holography(Invited)
Title of translation:同步相移数字全息综述(特邀)
Authors:Zhang, Meiling (1); Gao, Peng (1); Wen, Kai (1); Zhuo, Kequn (1); Wang, Yang (1); Liu, Lixin (1); Min, Junwei (2); Yao, Baoli (2)
Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Yao, Baoli(yaobl@opt.ac.c.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:7
Issue date:July 25, 2021
Publication year:2021
Article number:0709001
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

Phase-shifting Digital Holography(PSDH), which combines phase-shifting technology with digital holography, provides a fast, non-invasive, and high-precision approach for the three-dimensional morphology or refractive index distribution of microscopic objects. Compared with the off-axis digital holography, the phase-shifting on-axis digital holography makes full utilization of Spatial-bandwidth Product (SBP) of the CCD camera. The conventional phase-shifting digital holography needs to records multiple phase-shifting holograms in a step-by-step manner, from which the artifact-free phase and amplitude images of a sample can be reconstructed. To enhance the imaging speed of PSDH, parallel phase-shifting technique (or simultaneous phase-shifting technique) was proposed, with which multiple phase-shifting holograms can be obtained at the same time. In this paper, the concept and implementation of phase-shifting technologies are introduced firstly. Then, three different approaches of parallel phase-shifting, which are based on multiple CCDs, pixelated phase-mask, and parallel beam-splitting, are reviewed. Eventually, the applications of parallel PSDH in the biomedical field, air/liquid flow visualization, surface topography, micro-/nano-scale device inspection are introduced.
© 2021, Science Press. All right reserved.
Number of references:122
Main heading:Holograms
Controlled terms:CCD cameras - Refractive index - Topography
Uncontrolled terms:Digital holography - Microscopic objects - Off-axis digital holographies - Phase-shifting digital holography - Phase-shifting technique - Phase-shifting technology - Refractive-index distribution - Three dimensional morphology
Classification code:714.2 Semiconductor Devices and Integrated Circuits - 741.1 Light/Optics - 743 Holography - 951 Materials Science
DOI:10.3788/gzxb20215007.0709001
Funding text:National Natural Science Foundation of China (Nos. 62075177, 61975233), Natural Science Foundation of Shaanxi Province (Nos.2020JM-193, 2020JQ-324), Fundamental Research Funds for the Central Universities (No.JB210513), State Key Laboratory of Transient Optics and Photonics (No.SKLST201804), State Key Laboratory of Jiangxi Province for Image Processing and Pattern Recognition (No.ET202080417)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910310695
Title:Molybdenum Carbide Buried in D-Shaped Fibers as a Novel Saturable Absorber Device for Ultrafast Photonics Applications
Authors:Liu, Sicong (1); Shang, Shiguang (2); Lv, Ruidong (3); Wang, Yonggang (1, 4); Wang, Jiang (1); Ren, Wei (2); Wang, Yishan (4)
Author affiliation:(1) School of Physics and Information Technology, Shaanxi Normal University, Xi'an; 710119, China; (2) School of Science, Xi'An Institute of Posts and Telecommunications, Xi'an; 710121, China; (3) School of Electronic Science and Engineering, Xi'An Jiaotong University, Xi'an; 710049, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:Wang, Yonggang(chinawygxjw@snnu.edu.cn)
Source title:ACS Applied Materials and Interfaces
Abbreviated source title:ACS Appl. Mater. Interfaces
Volume:13
Issue:16
Issue date:April 28, 2021
Publication year:2021
Pages:19128-19137
Language:English
ISSN:19448244
E-ISSN:19448252
Document type:Journal article (JA)
Publisher:American Chemical Society
Abstract:

Study of nonlinear laser-matter interactions in 2D materials has promoted development of photonics applications. As a typical MXene material, molybdenum carbide (Mo2C) has attracted much attention because of its graphene-like structure. Here, a type of D-shaped fiber (DF)-buried Mo2C saturable absorber (SA) fabricated by magnetron-sputtering deposition (MSD) and sol-gel technique is reported. The Mo2C material was buried between the bottom DF and the upper amorphous silica fabricated by sol-gel technology. Therefore, the DF-based SA effectively solves the problem of material shedding and aging, thus improving the stability and damage threshold of the fiber laser. Application of the SA in erbium-doped fiber laser and stable passive Q-switched operation with a maximum pulse energy of 430.47 nJ is realized. By adjusting the polarization state and pump power, high-power mode-locked pulses are generated with a pulse duration and output power of 199 fs and 54.13 mW, respectively. Further, bound-state soliton pulses are obtained with a pulse width of 312 fs and soliton interval of 1.26 ps for the first time based on MXene materials. Moreover, by application of the SA in ytterbium-doped fiber lasers, a stable dissipative soliton mode-locked pulse is obtained with a pulse width of 23 ps. These results indicate that the DF-based buried Mo2C as a novel SA provides a reliable method for all-fiber and multifunctional high-power ultrafast laser.
© 2021 American Chemical Society.
Number of references:45
Main heading:Ultrafast lasers
Controlled terms:Carbides - Fiber lasers - Fibers - Molybdenum compounds - Optical pumping - Saturable absorbers - Silica - Sol-gel process - Sol-gels - Solitons
Uncontrolled terms:Dissipative solitons - Erbium doped fiber laser - Magnetron-sputtering deposition - Photonics applications - Polarization state - Sol-gel technology - Ultra-fast photonics - Ytterbium-doped fiber lasers
Classification code:744.1 Lasers, General - 744.4 Solid State Lasers - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 812.1 Ceramics - 812.3 Glass
Numerical data indexing:Energy 4.30e-07J, Power 5.41e-02W, Time 1.26e-12s, Time 1.99e-13s, Time 2.30e-11s, Time 3.12e-13s
DOI:10.1021/acsami.1c01345
Funding details: Number: GK201702005, Acronym: -, Sponsor: -;Number: 61690222, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019TS117, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;
Funding text:This work is supported by the Central University Special Fund Basic Research and Operating Expense (GK201702005), Fundamental Research Funds for the Central Universities (2019TS117), and National Natural Science Foundation of China (61690222).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211610236249
Title:Research progress of 0.9 ~ 1.0 μm near-infrared continuous-wave fiber lasers
Title of translation:0.9~1.0 μm近红外连续光纤激光器的研究进展
Authors:Dang, Wen-Jia (1); Li, Zhe (2, 3); Lu, Na (1); Li, Yu-Ting (1); Zhang, Lei (1); Tian, Xiao (1)
Author affiliation:(1) School of Science, Xi'an Aeronautical University, Xi'an; 710077, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Dang, Wen-Jia(wenjia_dang@126.com)
Source title:Chinese Optics
Abbreviated source title:Chin. Opt.
Volume:14
Issue:2
Issue date:March 2021
Publication year:2021
Pages:264-274
Language:Chinese
ISSN:20951531
Document type:Journal article (JA)
Publisher:Editorial Office of Chinese Optics
Abstract:

Near-infrared continuous-wave fiber lasers with wavelengths of 0.9~1.0 μm have important application prospects in the fields of high-power blue and ultraviolet laser generation, high-power single-mode pump sources, biomedicine and lidars. They have thus become a heavily researched topic in recent years. At present, their gain mechanisms mainly include a rare earth ion gain or a nonlinear effect gain. In this paper, the research progress of 0.9~1.0 μm fiber lasers based on these two kinds of gain mechanisms are reviewed in detail, and the technical bottlenecks and solutions of these lasers are analyzed. Furthermore, the potential directions for the future of their research are proposed.
Copyright ©2021 Chinese Optics. All rights reserved.
Number of references:64
Main heading:Continuous wave lasers
Controlled terms:Fiber lasers - Infrared devices - Metal ions - Pumping (laser) - Rare earths - Ultraviolet lasers
Uncontrolled terms:Application prospect - Continuous Wave - High power - Near Infrared - Nonlinear effect - Pump sources - Rare earth ions - Single mode
Classification code:531.1 Metallurgy - 744.1 Lasers, General - 744.4 Solid State Lasers - 804.2 Inorganic Compounds
Numerical data indexing:Size 9.00e-07m to 1.00e-06m
DOI:10.37188/CO.2020-0193
Funding details: Number: 2019KRM093, Acronym: -, Sponsor: -;Number: 17JK0394,19JK0429, Acronym: -, Sponsor: Education Department of Shaanxi Province;Number: 2019JQ-914, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;Number: 2018ZDXM-GY-051, Acronym: -, Sponsor: -;
Funding text:基金项目：陕 西 省 自 然 科 学 基 础 研 究 计 划 资 助 项 目 （ No. 2019JQ-914） ； 陕 西 省 创 新 能 力 支 撑 计 划 项 目 （No. 2019KRM093）；陕西省教育厅专项科研计划项目（No. 17JK0394，No. 19JK0429）；陕西省科技厅重点研发 计划项目（No. 2018ZDXM-GY-051） Supported by the Natural Science Basic Research Program of Shaanxi (No. 2019JQ-914); Innovation Capabil-ity Support Program of Shaanxi (No. 2019KRM093); Scientific Research Program Funded by Shaanxi Provin-cial Education Department (No. 17JK0394, No. 19JK0429); Key Research and Development Program Fund of Shaanxi Science and Technology Department (No. 2018ZDXM-GY-051)Supported by the Natural Science Basic Research Program of Shaanxi (No. 2019JQ-914); Innovation Capability Support Program of Shaanxi (No. 2019KRM093); Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 17JK0394, No. 19JK0429); Key Research and Development Program Fund of Shaanxi Science and Technology Department (No. 2018ZDXM-GY-051)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510525586
Title:Advances in G-stack diode laser using macro-channel water cooling and high thermal conductivity material packaging
Authors:Han, Yang (1); Sun, Lichen (1); Fu, Tuanwei (1); Gao, Lijun (1); Zheng, Yanfang (1); Chen, Yunzhu (1); Zhang, Xiaojuan (1); Yan, Minna (1); Zhao, Sicheng (1); Yang, Kai (1); Gao, Lei (1); Zah, Chungen (1); Liu, Xingsheng (1, 2)
Author affiliation:(1) Focuslight Technologies Inc., 56 Zhangba 6th Road, Xi'an High-Tech Zone, Xi'an, Shaanxi; 710077, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an Hi-Tech Industrial Development Zone, No. 17 Xinxi Road, New Industrial Park, Xi'an, Shaanxi; 710119, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11668
Part number:1 of 1
Issue title:High-Power Diode Laser Technology XIX
Issue date:2021
Publication year:2021
Article number:116680W
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510641716
Document type:Conference article (CA)
Conference name:High-Power Diode Laser Technology XIX 2021
Conference date:March 6, 2021 - March 11, 2021
Conference location:Virtual, Online, United states
Conference code:169165
Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:

There are strong demands at the market to increase power and reliability for high power diode laser. In parallel to this the requirements for cooler and package for the high power diode laser increase. Superior heat dissipation capability and low thermal resistance are some of the key attributes for the diode laser package design in the near future. The most common method of removing the large amounts of waste heat in a diode laser is using a micro-channel cooler. However, a microchannel cooler requires water to meet demanding specifications to avoid failures due to corrosion, which increases the overall cost to operate and maintain the laser. We demonstrate advances in a new macro-channel water cooling diode laser which are designed to eliminate the failure mechanisms associated with micro-channel coolers, and enhance the laser heat dissipation and the long-term reliability. For the package adopting the high thermal conductivity material, the maximum output power is 100 W per bar in CW mode. Due to the advantage of compact design, high power, high reliability and fast axis collimation, the new diode laser has the potential to be widely used in many fields, such as pumping solid state laser, hair removal, industry and research. © 2021 SPIE.
© 2021 SPIE. All rights reserved.
Number of references:8
Main heading:Semiconductor lasers
Controlled terms:Cooling systems - Cooling water - Corrosion - Diodes - Failure (mechanical) - Heat resistance - Laser beam welding - Power semiconductor diodes - Pumping (laser) - Reliability - Solid state lasers - Thermal conductivity - Waste heat
Uncontrolled terms:Failure mechanism - Fast axis collimations - Heat dissipation capability - High power diode laser - High thermal conductivity - Material packaging - Maximum output power - Microchannel coolers
Classification code:525.4 Energy Losses (industrial and residential) - 641.1 Thermodynamics - 744 Lasers
Numerical data indexing:Power 1.00e+02W
DOI:10.1117/12.2582695

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509874615
Title:GaAs material photorefractive response time measurement based on spectral probe
Authors:Yang, Qing (1); Yin, Fei (1, 2); Wang, Tao (2); Gao, Guilong (2); He, Kai (2); Yan, Xin (2)
Author affiliation:(1) School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi; 710049, China; (2) Key Laboratory of Ultrafast Photoelectric Diagnostics Technology, Xian Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xian, Shaanxi; 710119, China
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11761
Part number:1 of 1
Issue title:Fourth International Conference on Photonics and Optical Engineering
Issue date:2021
Publication year:2021
Article number:117610U
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643574
Document type:Conference article (CA)
Conference name:4th International Conference on Photonics and Optical Engineering
Conference date:October 15, 2020 - October 16, 2020
Conference location:Xi'an, China
Conference code:166676
Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher:SPIE
Abstract:The ultrafast all-optical solid-state framing camera(UASFC) technique is a new diagnostic method based on the semiconductor photorefractive effect. The ultra-fast response characteristics of this method are mainly determined by the response time of the semiconductor material's photorefractive index change. How to quickly and accurately measure the photorefractive index response time of semiconductor materials is an important step in the development of all-optical solid ultra-fast diagnostic chip. In this paper, the 100fs pulsed laser is divided into two beams. One of which is used as excitation light to generate pulsed X-ray source; the other beam is measured as a spectral probe light. Through the test of GaAs material, the response time of the refractive index change of GaAs material was less than 5ps, which laid a foundation for further optimization experiment and accurate measurement.
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Number of references:13
Main heading:Photoreactivity
Controlled terms:Gallium arsenide - III-V semiconductors - Photonics - Photorefractive materials - Probes - Refractive index - Semiconducting gallium
Uncontrolled terms:Accurate measurement - Diagnostic methods - Excitation light - Photorefractive effects - Photorefractive index - Photorefractive response - Pulsed x-ray sources - Refractive index changes
Classification code:712.1.1 Single Element Semiconducting Materials - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 804 Chemical Products Generally
Numerical data indexing:Time 1.00e-13s, Time 5.00e-12s
DOI:10.1117/12.2586950

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212110414100
Title:Testing Characterization and Simulating Optimization of High-power Laser Diode Array Chips
Title of translation:高功率半导体激光列阵芯片测试表征与仿真优化
Authors:Du, Yu-Qi (1, 2); Wang, Zhen-Fu (1); Zhang, Xiao-Ying (3); Yang, Guo-Wen (1); Li, Te (1); Liu, Yu-Xian (1, 2); Li, Bo (1, 2); Chang, Yi-Dong (1, 2); Zhao, Yu-Liang (1, 2); Lan, Yu (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Shaanxi Institute of Metrology Science, Xi'an; 710100, China
Corresponding author:Wang, Zhen-Fu(wzf2718@opt.ac.cn)
Source title:Faguang Xuebao/Chinese Journal of Luminescence
Abbreviated source title:Faguang Xuebao
Volume:42
Issue:5
Issue date:May 2021
Publication year:2021
Pages:674-681
Language:Chinese
ISSN:10007032
CODEN:FAXUEW
Document type:Journal article (JA)
Publisher:Editorial Office of Chinese Optics
Abstract:

Due to small size, light weight, high efficiency and long operation life, high power semiconductor laser array chips have gradually entered into mass-markets and emerged applications, such as laser pumping, materials processing, medical therapy and lidar. However, limited by high-temperature working environments such as material processing, the development of high power semiconductor laser is hindered. Since laser diode arrays work in high-temperature working environments and generate great quantity during operating, the output power and reliability of high power semiconductor laser is decreased, which is caused by reducing in slope efficiency, increasing in threshold current, and wavelength redshift. Hence, it is vital to research the optoelectronic performance and laser diode array optimization of semiconductor laser under high temperature. To improve the high temperature performance of high-power semiconductor laser chips, firstly, the influence mechanism of environment temperature on internal quantum efficiency is analyzed theoretically. Secondly, in order to quantify the main factors affecting the stability of the chip, the high-power semiconductor laser array chips test system was built to study the characteristics of the laser diode array chips at 15-60℃, and analyze energy loss distribution at various temperatures. The experimental results show that when the temperature rises from 15℃ to 60℃, the percentage of carrier leakage loss increases sharply from 2.30% to 11.36%, which is the main factor affecting the high temperature operation of semiconductor laser array chips. Finally, the chip structure simulation shows that increasing the Al composition of the waveguide layer to 20% can effectively limit carrier leakage, balance the increase in series resistance caused by the increase of Al composition, and obtain high electro-optical conversion efficiency. This research can provide a reference for the design of high-temperature laser diode array chips.
© 2021, Science Press. All right reserved.
Number of references:22
Main heading:Laser materials processing
Controlled terms:Diodes - Electric resistance - Energy dissipation - High power lasers - High temperature operations - Optical radar - Power semiconductor diodes - Pumping (laser) - Semiconductor lasers
Uncontrolled terms:Energy loss distributions - Environment temperature - High power laser diode arrays - High power semiconductor laser - High temperature performance - Internal quantum efficiency - Materials processing - Semiconductor laser arrays
Classification code:525.4 Energy Losses (industrial and residential) - 701.1 Electricity: Basic Concepts and Phenomena - 716.2 Radar Systems and Equipment - 744 Lasers
Numerical data indexing:Percentage 2.00e+01%, Percentage 2.30e+00% to 1.14e+01%
DOI:10.37188/CJL.20210014
Funding details: Number: 2015JQ6263, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2018JM6010, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2019ZY-CXPT-03-05, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 61504167, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Supported by National Natural Science Foundation of China(61504167); Natural Science Foundation of Shaanxi Province(2019ZY-CXPT-03-05, 2018JM6010, 2015JQ6263); Talent Project of Science and Technology Department of Shaanxi Province(2017KJXX-72).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609900370
Title:Research on the X-ray wavelength division multiplexing technology for blackout region communication
Authors:LI, YAO (1); SU, TONG (2); SHENG, LIZHI (2); XU, NENG (2); ZHAO, BAOSHENG (2)
Author affiliation:(1) Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test, College of Optoelectronic Engineering, Xi'an Technological University, Xi'an; 710021, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China
Corresponding author:LI, YAO(liyao_xatu@163.com)
Source title:Optica Applicata
Abbreviated source title:Opt Appl
Volume:50
Issue:4
Issue date:2021
Publication year:2021
Pages:619-632
Language:English
ISSN:00785466
E-ISSN:18997015
CODEN:OPAPBZ
Document type:Journal article (JA)
Publisher:Wroc&lstrok;aw University of Science and Technology
Abstract:After the concept of X-ray communication was proposed, its application in complex electromagnetic environment has received more attention, such as data transmission in re-enter special electromagnetic condition. In this article, a new type of X-ray source was introduced firstly, which was expected to generate multiple characteristic lines and achieve wavelength division multiplexing technology in X-ray band. Then an experimental platform was built for analyzing transmission characteristics of X-ray photon in various plasma media. Finally, the calculation model for a link power equation was given. Experiment results show that transmittance of 8-18 keV X-ray signal is relatively stable, atomic numbers from 29 to 42 are the most suitable materials for wavelength division multiplexing, the X-ray communication system is expected to realize about 200 kbps data transmission rate in adjacent space.
© 2020 WrocÅ‚aw University of Science and Technology. All rights reserved.
Number of references:28
Main heading:X rays
Controlled terms:Atoms - Data transfer - Outages
Uncontrolled terms:Calculation models - Data transmission rates - Electromagnetic environments - Experimental platform - Multiple characteristics - Transmission characteristics - Wavelength division multiplexing technology - X-ray wavelengths
Classification code:706.1 Electric Power Systems - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics
Numerical data indexing:Bit_Rate 2.00e+05bit/s
DOI:10.37190/OA200409
Funding details: Number: 20JY031, Acronym: -, Sponsor: -;Number: 11805150,61901470,62001364, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20JK0665, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Provincial Department of Education;Number: 2020JQ-818, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:Acknowledgements – This article was supported by NSFC of China (No. 61901470, No. 62001364 and No. 11805150) and the Basic Research Program of Shaanxi Province Natural Science Foundation (No. 2020JQ-818), the Natural Science Foundation of Shaanxi Provincial Department of Education (No. 20JK0665), and the Collaborative Innovation Center Project of Shaanxi Provincial Department of Education (20JY031). The quasi-static and dynamic-dusty experiments were carried out in the College of Aerospace Science and Technology, XIDIAN University and XIOPM, respectively.

Database:Compendex
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Accession number:20210909995006
Title:Free-carrier-assisted mid-infrared microcavity soliton generation????(Open Access)
Authors:Fan, Weichen (1, 2); Sun, Qibing (1, 2); Lu, Zhizhou (1, 2); Wang, Leiran (1, 2); Zhao, Wei (1, 2); Zhang, Wenfu (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Journal of Applied Physics
Abbreviated source title:J Appl Phys
Volume:129
Issue:8
Issue date:February 28, 2021
Publication year:2021
Article number:083106
Language:English
ISSN:00218979
E-ISSN:10897550
CODEN:JAPIAU
Document type:Journal article (JA)
Publisher:American Institute of Physics Inc.
Abstract:Multi-photon absorption (MPA) and free-carrier (FC) effects, usually considered to be detrimental to microcomb generation by introducing strong nonlinear loss, also offer opportunities to overwhelm the thermal-optic effect by modifying the refractive index. Here, we derive the theoretical expression of solitons expanded with MPA and FC effects, accompanied by numerical simulations to reveal the dynamics and mechanism for capturing steady mid-infrared solitons in both Si and Ge microcavities. It is found that with increased FC lifetime, the intensity-dependent MPA underlies non-monotonous variation of nonlinear detuning which enables soliton generation. More interestingly, proper control on the FC lifetime admits bidirectional switching of soliton states (i.e., both decreasing and increasing the number of solitons) as well as self-starting solitons, yielding different technique routes toward microcavity solitons. This research could contribute to a better understanding of nonlinear behaviors influenced by FC effects and find practical applications by releasing the demand on precise control of laser sources, which is especially meaningful for the mid-infrared region.
© 2021 Author(s).
Number of references:36
Main heading:Solitons
Controlled terms:Infrared devices - Microcavities - Multiphoton processes - Refractive index
Uncontrolled terms:Intensity-dependent - Mid-infrared regions - Multi-photon absorption - Nonlinear behavior - Nonlinear loss - Precise control - Soliton generation - Theoretical expression
Classification code:714 Electronic Components and Tubes - 741.1 Light/Optics
DOI:10.1063/5.0037921
Funding details: Number: 61635013,61675231,61705257,61805277, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2016353, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;
Funding text:The authors thank Hairun Guo and Xiaohong Hu for valuable discussions. The authors acknowledge the support from the National Natural Science Foundation of China (NNSFC) (Grant Nos. 61635013, 61675231, 61705257, and 61805277), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB24030600), and the Youth Innovation Promotion Association of CAS (No. 2016353).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Green

Accession number:20210809975867
Title:Research Progress of Attosecond Pulse Generation and Characterization (Invited)
Title of translation:阿秒脉冲产生和测量技术研究进展(特邀)
Authors:Wang, Hushan (1); Cao, Huabao (1); Pi, Liangwen (1); Huang, Pei (1); Wang, Xianglin (1); Xu, Peng (1); Yuan, Hao (1, 2); Liu, Xin (1, 2); Wang, Yishan (1); Zhao, Wei (1); Fu, Yuxi (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Wang, Yishan(yshwang@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:1
Issue date:January 25, 2021
Publication year:2021
Article number:0132001
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:Attosecond pulse light source, born at the turn of 21st centruy, is a fully coherent light source with attosecond-temporal and nano-spatial resolution, leading to the remarkable progress and breakthroughs in attosecond science in the past two decades. New research methods and important innovation opportunities in physics, chemistry, biology, materials, information and other fields have emerged with the advent of attoseond pulse. This review surveys the important efforts aimed at developing attosecond pulses, mainly summarizes the key technologies and status of high-order harmonics, attosecond pulse generation and attosecond pulse measurement, and presents the development prospects of attosecond pulse research in the end.
© 2021, Science Press. All right reserved.
Number of references:164
Main heading:Light sources
Controlled terms:Optics - Photonics
Uncontrolled terms:Attosecond pulse - Attosecond pulse generation - Attosecond science - Attoseconds - Development prospects - High order harmonics - Key technologies - Spatial resolution
Classification code:741.1 Light/Optics
DOI:10.3788/gzxb20215001.0132001
Funding details: Number: S19-020, Acronym: -, Sponsor: -;Number: 202005YK01, Acronym: -, Sponsor: -;Number: 61690222,92050107,XAB2019B25, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:Foundation item：Natural Science Basic Research Program of Shaanxi（No. 2019JCW-03），Major Science and Technology Infrastructure Pre-research Program of the CAS（No. J20-021-Ⅲ），National Natural Science Foundation of China（No. 92050107），National Natural Science Foundation of China（No. 61690222），CAS"Light of West China"Program（No. XAB2019B25），Science and Technology Program of Xi'an（No. 202005YK01），Key Deployment Research Program of XIOPM（No. S19-020-Ⅲ）

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410162170
Title:The effect of oceanic turbulence on optical receiving systems
Authors:Sun, Shu-Wei (1, 2); Kang, Fu-Zeng (1); Wang, Hao (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Kang, Fu-Zeng
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11763
Part number:1 of 1
Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications
Issue date:2021
Publication year:2021
Article number:1176354
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643611
Document type:Conference article (CA)
Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications
Conference date:November 5, 2020 - November 7, 2020
Conference location:Kunming, China
Conference code:167886
Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory
Publisher:SPIE
Abstract:With the development of underwater optical communication, imaging and sensing, studies of the effect of oceanic turbulence on optical receiving systems have received increasing attention and become a research focus. Until now, the effect of atmosphere turbulence on optical receiving systems have studied widely and in depth, but those in oceanic turbulence have been researched seldom. It is known that the atmosphere turbulence is induced by the temperature fluctuation, while the oceanic turbulence is induced by both the temperature fluctuation and the salinity fluctuation. Thus, the behavior of laser propagation through oceanic turbulence is very different from that in atmosphere turbulence.The paper focuses on the influence of phase disturbance of optical signal caused by oceanic turbulence on optical receiving, including the theoretical modeling of couple efficiency of space optical signal into single-mode fiber received by annular aperture and the variance of angle-of-arrival (AOA) fluctuation received by finite aperture. The research shows that the couple efficiency of single-mode fiber and the variance of angle-of-arrival fluctuation in oceanic turbulence depend on propagation distance, receiving aperture and oceanic turbulence parameter. The results obtained in this paper will be useful for optical receiving systems involving oceanic turbulence channels.
© 2021 SPIE
Number of references:12
Main heading:Atmospheric turbulence
Controlled terms:Direction of arrival - Efficiency - Marine communication - Optical communication - Single mode fibers - Temperature distribution - Underwater imaging
Uncontrolled terms:Angle of arrival fluctuations - Atmosphere turbulence - Propagation distances - Receiving aperture - Salinity fluctuation - Temperature fluctuation - Theoretical modeling - Underwater optical communications
Classification code:443.1 Atmospheric Properties - 641.1 Thermodynamics - 716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics - 746 Imaging Techniques - 913.1 Production Engineering
DOI:10.1117/12.2587149

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213310780852
Title:Compact 2D serpentine optical phased array
Authors:Ren, Yangming (1, 2); Zhang, Lingxuan (1, 2); Zhao, Wei (1, 2); Wang, Guoxi (1, 2); Feng, NingNing (1, 2); Wu, Wei (1, 2); Sun, Xiaochen (1, 2); Zhang, Wenfu (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:24
Issue date:August 20, 2021
Publication year:2021
Pages:7158-7163
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We present a two-dimensional (2D) Si photonics optical phased array (OPA) using a serpentine design which eliminates the long directional couplers used in many 2D OPA designs. It significantly reduces the distance between the antenna benefitting far-field sidelobe reduction while maintaining high optical power use efficiency.
© 2021 Optical Society of America
Number of references:25
Main heading:Serpentine
Controlled terms:Antennas - Photonics
Uncontrolled terms:Far field - High optical power - Optical phased arrays - Si photonics - Side-lobe reduction - Two Dimensional (2 D) - Use efficiency
Classification code:482.2 Minerals - 741.1 Light/Optics
DOI:10.1364/AO.431942
Funding details: Number: 12004421, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2016535, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;Number: 61635013, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (12004421, 61635013, 61675231); Youth Innovation Promotion Association (2016535); West Light Foundation of the Chinese Academy of Sciences (XAB2017A09); Natural Science Foundation of Shaanxi Province (2019JQ-447); Research Project of Xi'an Postdoctoral Innovation Base (201903).

 

Database:Compendex
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Accession number:20210209763503
Title:Controlled asymmetric bidirectional quantum teleportation of two- and three-qubit states
Authors:Huo, Guangwen (1); Zhang, Tongyi (2); Zha, Xinwei (3); Zhang, Xiuxing (1); Zhang, Meizhi (3)
Author affiliation:(1) School of Mathematics and Physics, Weinan Normal University, Weinan; 714099, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) School of Electronics Engineering, Xi’an University of Posts and Telecommunications, Xi’an; 710121, China
Corresponding author:Huo, Guangwen(guangwenhuo@126.com)
Source title:Quantum Information Processing
Abbreviated source title:Quantum Inf. Process.
Volume:20
Issue:1
Issue date:January 2021
Publication year:2021
Article number:24
Language:English
ISSN:15700755
E-ISSN:15731332
Document type:Journal article (JA)
Publisher:Springer
Abstract:We propose a protocol of asymmetric controlled bidirectional quantum teleportation of two- and three-qubit states. That is to say, Alice wants to teleport an arbitrary two-qubit state to Bob, and Bob wants to teleport an arbitrary three-qubit state for Alice via the control of supervisor Charlie. By using the eleven-qubit entangled state as the quantum channel, Alice can teleport an arbitrary two-qubit state for Bob and Bob can teleport an arbitrary three-qubit state for Alice simultaneously.
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.
Number of references:20
Main heading:Quantum entanglement
Controlled terms:Qubits
Uncontrolled terms:Quantum teleportation - Qubit entangled state - Qubit state - Two-qubit state
Classification code:931.4 Quantum Theory; Quantum Mechanics
DOI:10.1007/s11128-020-02956-3
Funding details: Number: 2017ZDJC-27, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 20RC04, Acronym: WNU, Sponsor: Weinan Normal University;Number: 61475191, Acronym: NSFC, NNSF, NNSFC, Sponsor: National Natural Science Foundation of China;Number: 61875228, Acronym: NSFC, NNSF, NNSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by National Natural Science Foundation of China (Grant Nos. 61875228, 61475191), Natural Science Basic Research Plan in Shaanxi Province of China (2017ZDJC-27), and Weinan Normal University Research Foundation for Talented Scholars (2019RC3).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213010677900
Title:Waveguide Optimization and Efficiency Characteristic Analysis of 808 nm Laser Diodes
Title of translation:808 nm半导体激光芯片波导优化与效率特性分析
Authors:Chang, Yi-Dong (1, 2); Wang, Zhen-Fu (2); Zhang, Xiao-Ying (3); Yang, Guo-Wen (2); Li, Te (2); Du, Yu-Qi (1, 2); Zhao, Yu-Liang (1, 2); Liu, Yu-Xian (1, 2); Lan, Yu (1, 2)
Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Shaanxi Institute of Metrology Science, Xi'an; 710100, China
Corresponding author:Wang, Zhen-Fu(wzf2718@opt.ac.cn)
Source title:Faguang Xuebao/Chinese Journal of Luminescence
Abbreviated source title:Faguang Xuebao
Volume:42
Issue:7
Issue date:July 2021
Publication year:2021
Pages:1040-1048
Language:Chinese
ISSN:10007032
CODEN:FAXUEW
Document type:Journal article (JA)
Publisher:Editorial Office of Chinese Optics
Abstract:

The waveguide thickness of 808 nm InAlGaAs/AlGaAs laser diode chip was optimized in this paper. The study found that when the thickness ratio of the N-waveguide to the P-waveguide was 1.8, the chip had the highest power conversion efficiency. Chip-on-submount(COS) packaged single emitters and fiber-coupled modules@core diameter 62.5 μm, numerical aperture(NA) 0.22 were presented based on this conclusion, and the efficiency characteristic of the devices in the range of -10-90℃ was analyzed. The results showed that when the temperature increased from -10 to 90℃, the carrier leakage ratio of COS single emitter increased from 1.18% to 16.67%, and the carrier leakage ratio of fiber-coupled module increased from 1.99% to 17.73%, indicating that the increase of carrier leakage caused by temperature rise was the main factor leading to the decrease of power conversion efficiency. Moreover, the effects of high-temperature aging, thermal vacuum conditions and space radiation on the power conversion efficiency of fiber-coupled module were studied and the internal factors that lead to the reduction of the device's power conversion efficiency were revealed.
© 2021, Science Press. All right reserved.
Number of references:21
Main heading:Conversion efficiency
Controlled terms:Efficiency - Radiation effects - Semiconductor lasers - Waveguides
Uncontrolled terms:Efficiency characteristic - Fiber coupled modules - High temperature aging - Numerical aperture - Power conversion efficiencies - Thermal vacuum condition - Waveguide optimization - Waveguide thickness
Classification code:525.5 Energy Conversion Issues - 714.3 Waveguides - 744.4.1 Semiconductor Lasers - 913.1 Production Engineering
Numerical data indexing:Percentage 1.18e+00% to 1.67e+01%, Percentage 1.99e+00% to 1.77e+01%, Size 6.25e-05m, Size 8.08e-07m
DOI:10.37188/CJL.20210108
Funding details: Number: 2015JQ6263, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2018JM6010, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2019ZY-CXPT-03-05, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 61504167, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Supported by National Natural Science Foundation of China(61504167); Natural Science Foundation of Shaanxi Province(2019ZY-CXPT-03-05, 2018JM6010, 2015JQ6263); Talent Project of Science and Technology Department of Shaanxi Province(2017KJXX-72).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710263888
Title:Direct axial plane imaging of particle manipulation with nondiffracting Bessel beams
Authors:An, Sha (1, 2); Peng, Tong (1, 2); Yan, Shaohui (1); Zhang, Peng (1); Li, Manman (1); Yao, Baoli (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:11
Issue date:April 10, 2021
Publication year:2021
Pages:2974-2980
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

Optical manipulation with nondiffracting beams has been attracting great interest and finding widespread applications in many fields such as chemistry, physics, and biomedicine. Generally, optical manipulation is conducted in an optical microscopy system, which, in general, only allows for imaging motions of particles in the transverse plane, rendering the observation of dynamics processes occurring in the axial plane impractical.We propose and demonstrate an optical manipulation system that incorporates an axial plane imaging module. With this system, the trapping behavior in the transverse plane and the transportation process in the axial plane of a particle immersed in a Bessel beamwere acquired simultaneously in real time.
© 2021 Optical Society of America.
Number of references:40
Main heading:Molecular physics
Controlled terms:Optics
Uncontrolled terms:Axial planes - Bessel beam - Nondiffracting - Nondiffracting beam - Optical manipulation - Particle manipulation - Transportation process - Transverse planes
Classification code:741.1 Light/Optics - 931.3 Atomic and Molecular Physics
DOI:10.1364/AO.417854
Funding details: Number: 11904395,61705256,11974417, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Funding. National Natural Science Foundation of China (11904395, 11974417, 61705256).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510544803
Title:Intensity Demodulation Technology of FBG Time Division Multiplexing Based on Sagnac Ring
Title of translation:基于Sagnac环的FBG时分复用强度解调技术
Authors:Wang, Xiaoli (1, 2); Dong, Bo (1); Chen, Enqing (1, 2); Li, Yang (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Dong, Bo(bdong@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:5
Issue date:May 25, 2021
Publication year:2021
Article number:0506003
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

A method of fiber Bragg grating time-division multiplexing intensity demodulation based on Sagnac fiber ring is presented. The time-multiplexing sensing system, consisted of the several FBG gratings with the same central-wavelength, can demodulate the signals by observing the intensity changes of the output spectrum of the FBG gratings. In the signal processing module, the wavelet analysis and Gaussian simulation algorithm are combined to demodulate the system signal together. The experimental results show that the signal-to-noise ratio of the system signal is increased by about 36% from 8.06 dB to 11.7 dB, which effectively improves the anti-interference ability of the system and the detection accuracy for the external parameters. The proposed method effectively increases the number of fiber Bragg grating sensors in the demodulation system with less cost and can be widely applied to various sensor systems or parameter detection systems.
© 2021, Science Press. All right reserved.
Number of references:23
Main heading:Fiber Bragg gratings
Controlled terms:Demodulation - Fiber optic sensors - Optical variables measurement - Signal to noise ratio - Time division multiplexing
Uncontrolled terms:Anti-interference - Central wavelength - Demodulation system - Detection accuracy - Fiber Bragg Grating Sensors - Gaussian simulations - Intensity demodulation - Parameter detection
Classification code:716.1 Information Theory and Signal Processing - 741.1.2 Fiber Optics - 941.4 Optical Variables Measurements
Numerical data indexing:Decibel 8.06e+00dB to 1.17e+01dB, Percentage 3.60e+01%
DOI:10.3788/gzxb20215005.0506003
Funding text:Hundred Talents Program of Chinese Academy of Sciences (No. Y829321213).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213410819650
Title:Femtosecond Chirped Pulse Amplification System with Liquid Crystal Spatial Light Modulator for Spectral Modulation
Title of translation:基于液晶空间光调制器进行光谱调制的飞秒啁啾脉冲放大系统
Authors:Duan, Yufei (1, 2); Li, Feng (1); Yang, Zhi (1); Li, Qianglong (1); Yang, Yang (1); Wu, Tianhao (1, 2); Wang, Yishan (1); Yang, Xiaojun (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Li, Feng(lifeng@opt.ac.cnemailyxj@opt.ac.cn)Yang, Xiaojun(yxj@opt.ac.cn)
Source title:Zhongguo Jiguang/Chinese Journal of Lasers
Abbreviated source title:Zhongguo Jiguang
Volume:48
Issue:11
Issue date:June 10, 2021
Publication year:2021
Article number:1101001
Language:Chinese
ISSN:02587025
CODEN:ZHJIDO
Document type:Journal article (JA)
Publisher:Science Press
Abstract:

Objective: Compared with traditional solid-state lasers, such as slats and wafers, femtosecond fiber lasers have many advantages, including compact structures, good beam quality, stable systems, and good heat dissipation. They are widely used in various application fields, particularly in the field of fine material processing. The current femtosecond fiber laser is mainly used to reduce the problems of nonlinearity and device damage in the amplification process using the chirped pulse amplification technology to obtain a femtosecond laser with its peak power and narrow pulse width meeting processing requirements. Owing to the increase in the energy demand of an industrial fiber laser, the amplification classes also gradually increase, rendering the narrowing effect due to an uneven gain medium increasingly severe and influencing the final spectral width. Thus, its occurrence increases the compressed pulse width limit, reduces the pulse peak power, and severely impacts the thermal diffusion in processing. Currently, the gain narrowing problem of a femtosecond fiber laser can be solved using self-phase modulation, a new amplifying stage system, or dielectric layer filters. However, these approaches can only form fixed spectral modulation, which cannot solve the gain narrowing problem in different amplification or laser systems with different power requirements of the same amplification system. Therefore, programmable devices are proposed to achieve the controllability of spectral modulation. Among them, the liquid crystal spatial light modulator, a common element for beam shaping and pulse shaping, exhibits higher regulating precision than the general acousto-optic filter. For a fiber laser seed source, its spectral width is only a few nanometers or tens of nanometers; the liquid crystal spatial light modulator is more suitable for fiber laser spectral modulation. This study focuses on the characteristics of the spatial light modulator and the requirement of a chirp pulse amplification system for spectral modulation. The solutions of a spectral shaping system are proposed based on the two-dimensional (2D) intensity-type liquid crystal spatial light modulator for spectral modulation. The chirped pulse amplification system eliminates the gain narrowing problem and achieves a narrower output pulse duration. Methods: Herein, the 2D intensity-type liquid crystal spatial light modulator was used for spectral modulation. First, the seed source is amplified using the single-mode amplification system and enters the spectral shaping system, which comprises the polarization-splitting prism, grating, and the intensity of reflection-type liquid crystal spatial light modulator to perform various spectral modulation shapes and verify the programmability and high precision of the spectral shaping system. Then, the subsequent multi-mode amplification and main amplification systems with an optical fiber aperture of 25 μm were established. The shape required for spectral shaping, which can be compared with the initial spectrum function to achieve a 2D grayscale map, was obtained using the step-by-step Fourier transform method combined with reverse operation. Next, the grayscale image was loaded into the spatial light modulator, and the spectral widths before and after the addition of the grayscale image were compared to investigate the influence of the shaping system on the spectra and the reasons for the spectral shape formation. Finally, the near-limited output pulse duration of the femtosecond laser was obtained by compressing an appropriate distance by the 1450 line/mm grating, and the pulse duration was measured using an autocorrelation instrument to determine the optimization results of pulse duration. Results and Discussions: The spectrum can be reshaped into flat-top, central-depression, triangle, continuous- depression, and other shapes using the spectral shaping system (Fig.4). Generally, as the spectral shaping becomes more complex and its shaping effect becomes worse, the modulation of the liquid crystal void generated using the liquid crystal spatial light modulator becomes increasingly obvious. After adding the main amplification system, the spectral width before entering the amplification system is reduced by approximately 1.5 nm (Fig.5) and the gain narrowing effect is evident. The grayscale map obtained using reverse operation was loaded on the 2D liquid crystal spatial light modulator to obtain the super-Gaussian spectral shape (Fig.6) after spectral shaping and amplification. The full width at half maximum of this spectrum is approximately 9.5 nm. The spectral width is approximately 2.5 nm, and the corresponding limited pulse duration is reduced from 222 fs to approximately 164 fs. Finally, the pulse duration of 170 fs, close to the limit, can be obtained after the laser with spectral shaping is compressed through the grating. Compared with that of direct compression, the pulse duration is decreased by 86 fs. Moreover, the pulse shape has a side lobe owing to the liquid crystal spacing problem of the liquid crystal spatial light modulator (Fig.7). Conclusions: Results show that the spectral shaping system can realize the arbitrary spectral modulation using the liquid crystal spatial light modulator. It can also set the spectral bandpass characteristics by regulating the function of different spectral component gains and realize dynamic matching using the subsequent amplification spectrum. Thus, this system is suitable for different conditions of gain spectrum modulation demand and can achieve a pulse duration close to the limit to meet the narrow output pulse duration and peak power of a femtosecond laser. Moreover, it achieves the purpose of efficient material cold working and satisfies the high requirements of the thermal effect for femtosecond laser applications. However, the improved results can be obtained using a modulator with a higher filling rate and smaller clearance for spectral shaping.
© 2021, Chinese Lasers Press. All right reserved.
Number of references:20
Main heading:Light modulators
Controlled terms:Chirp modulation - Cold working - Femtosecond lasers - Fiber lasers - Gaussian beams - Laser applications - Light modulation - Liquid crystals - Optical fibers - Optical pulse shaping - Spectroscopy - Ultrashort pulses
Uncontrolled terms:Bandpass characteristics - Chirp pulse amplification system - Chirped pulse amplification systems - Chirped pulse amplifications - Femtosecond fiber lasers - Fourier transform method - Liquid crystal spatial light modulators - Spatial light modulators
Classification code:535.2 Metal Forming - 711 Electromagnetic Waves - 713.4 Pulse Circuits - 716 Telecommunication; Radar, Radio and Television - 741.1 Light/Optics - 741.1.2 Fiber Optics - 744.4 Solid State Lasers - 744.9 Laser Applications
Numerical data indexing:Size 1.50e-09m, Size 2.50e-05m, Size 2.50e-09m, Size 9.50e-09m, Time 1.64e-13s, Time 1.70e-13s, Time 8.60e-14s
DOI:10.3788/CJL202148.1101001

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211410162136
Title:X-ray communication experiment using photocathode X-ray tube
Authors:Liu, Yong-An (1, 2); Xuan, Hao (1, 2); Sheng, Li-Zhi (1); Qiang, Peng-Fei (1); Su, Tong (1); Tian, Jin-Shou (1); Zhao, Bao-Sheng (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Liu, Yong-An(liuya@opt.ac.cn)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:11763
Part number:1 of 1
Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications
Issue date:2021
Publication year:2021
Article number:117638U
Language:English
ISSN:0277786X
E-ISSN:1996756X
CODEN:PSISDG
ISBN-13:9781510643611
Document type:Conference article (CA)
Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications
Conference date:November 5, 2020 - November 7, 2020
Conference location:Kunming, China
Conference code:167886
Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory
Publisher:SPIE
Abstract:In this paper, a novel X-ray tube, which uses a photocathode as an electron emission source, is first introduced. The X-ray tube with photocathode can use an external light source to control the output of photoelectrons, thereby controlling the characteristics of the emitted X-rays. Compared with the traditional X-ray tube with hot cathode, the X-ray emitted by the photocathode X-ray tube is completely modulated by the external light source. Therefore, X-rays can achieve instant on-off and arbitrary pulse waveform emission, and have extremely high time resolution. The basic characteristics of the photocathode X-ray tube was tested. By using the developed X-ray tube and LED light source, preliminary X-ray communication experiments have been carried out. The results show that the digital signal restoration with a frequency of up to 1MHz can be achieved. Except for X-ray communication, the developed photocathode X-ray tube can also have important applications in many fields such as radiation calibration and scintillator afterglow measurement.
© 2021 SPIE
Number of references:11
Main heading:X rays
Controlled terms:Electron emission - Light sources - Photocathodes - Signal reconstruction - Tubes (components) - X ray tubes
Uncontrolled terms:Arbitrary pulse - Basic characteristics - Digital signals - Electron emission sources - High-time resolution - Hot cathodes - LED light source - Radiation calibration
Classification code:619.1 Pipe, Piping and Pipelines - 714.1 Electron Tubes - 716.1 Information Theory and Signal Processing - 932.1 High Energy Physics
Numerical data indexing:Frequency 1.00e+06Hz
DOI:10.1117/12.2587619
Funding details: Number: 2018438, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;
Funding text:This work was supported by the CAS "Light of West China" Program (No. XAB2018A07) and the Youth Innovation Promotion Association CAS (No.2018438).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212510535091
Title:Preparation and Electromagnetic Wave Absorbing Mechanism of Helical Amorphous Carbon Nanotube/Bismaleimide (HACNT/BMI) Resin Composites
Title of translation:螺旋型非晶态碳纳米管/双马来酰亚胺树脂(HACNT/BMI)复合材料的制备及吸波机理
Authors:Zhu, Ruoxing (1, 2); Zhao, Tingkai (2); She, Shengfei (3); Li, Tiehu (2)
Author affiliation:(1) Library of Northwestern Polytechnical University, Xi'an; 710072, China; (2) School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an; 710072, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China
Source title:Cailiao Daobao/Materials Reports
Abbreviated source title:Cailiao Daobao/Mater. Rep.
Volume:35
Issue:10
Issue date:May 25, 2021
Publication year:2021
Pages:10216-10220
Language:Chinese
ISSN:1005023X
Document type:Journal article (JA)
Publisher:Cailiao Daobaoshe/ Materials Review
Abstract:

New electromagnetic wave absorbing materials are the hotspot and focus of research in national defense science and technology. Carbonmaterials, as light absorbing materials, have been widely valued by researchers. In this study, we prepared helical amorphous carbon nanotube/bismaleimide (HACNT/BMI) resin composites and investigated their electromagnetic wave absorbing properties. We used helical amorphous carbon nanotubes as adsorbing agents, bismaleimide as matrix to prepare HACNT/BMI resin composites. Helical amorphous carbon nanotubes were prepared by floating catalytic chemical vapor deposition method. Scanning electron microscope (SEM), transmission electron microscope(TEM), X-ray diffractometer (XRD) and Raman spectroscopy were used to characterize the morphology and structure of samples. The electromagnetic parameters of HACNT/BMI composites were measured by vector network analyzer. The results showed that the increasing in the content of absorbing agent enhanced the electromagnetic wave absorbing properties of HACNT/BMI composites. The maximum absorption peak reached -18.35 dB, the widest absorbing bandwidth reached 2.56 GHz(9.52~12.08 GHz) when the RL belows -10 dB, and the reflection loss exceeded 97%. Moreover, the absorption peak of HACNT/BMI composites with higher content of HACNTs shifted towards lower frequency compared to that of the sample with lower content of HACNTs. Our results indicate that the helical structures of HACNTs plays an important role in enhancing the electromagnetic wave absorbing performance of HACNT/BMI composites. The HACNTs could increase the possibility of multiple reflection of electromagnetic wave and the path length of scattered waves. As a result, the energy loss of incident electromagnetic wave was increased.
© 2021, Materials Review Magazine. All right reserved.
Number of references:21
Main heading:Electromagnetic wave reflection
Controlled terms:Amorphous carbon - Carbon nanotubes - Chemical vapor deposition - Circular waveguides - Composite structures - Electric network analyzers - Energy dissipation - Resins - Scanning electron microscopy - Transmission electron microscopy
Uncontrolled terms:Catalytic chemical vapor deposition - Electromagnetic parameters - Morphology and structures - Science and Technology - Vector network analyzers - Wave absorbing materials - Wave absorbing performance - Wave-absorbing property
Classification code:408.2 Structural Members and Shapes - 525.4 Energy Losses (industrial and residential) - 711 Electromagnetic Waves - 714.3 Waveguides - 761 Nanotechnology - 802.2 Chemical Reactions - 815.1.1 Organic Polymers - 933.2 Amorphous Solids
Numerical data indexing:Decibel -1.00e+01dB, Decibel -1.84e+01dB, Frequency 9.52e+09Hz to 1.21e+10Hz, Percentage 9.70e+01%
DOI:10.11896/cldb.20030156

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310447556
Title:Genetic-algorithm-based deep neural networks for highly efficient photonic device design
Authors:Ren, Yangming (1, 2); Zhang, Linxuan (1, 2); Wang, Weiqiang (1, 2); Wang, Xinyu (1, 2); Lei, Yufang (1, 2); Xue, Yulong (1, 2); Sun, Xiaochen (1, 2); Zhang, Wenfu (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Sun, Xiaochen(sunxiaochen@opt.ac.cnemailwfuzhang@opt.ac.cn)Zhang, Wenfu(wfuzhang@opt.ac.cn)
Source title:Photonics Research
Abbreviated source title:Photon. Res.
Volume:9
Issue:6
Issue date:June 1, 2021
Publication year:2021
Pages:B247-B252
Language:English
ISSN:23279125
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

While deep learning has demonstrated tremendous potential for photonic device design, it often demands a large amount of labeled data to train these deep neural network models. Preparing these data requires high-resolution numerical simulations or experimental measurements and cost significant, if not prohibitive, time and resources. In this work, we present a highly efficient inverse design method that combines deep neural networks with a genetic algorithm to optimize the geometry of photonic devices in the polar coordinate system. The method requires significantly less training data compared with previous inverse design methods. We implement this method to design several ultra-compact silicon photonics devices with challenging properties including power splitters with uncommon splitting ratios, a TE mode converter, and a broadband power splitter. These devices are free of the features beyond the capability of photolithography and generally in compliance with silicon photonics fabrication design rules.
© 2021 Chinese Laser Press
Number of references:34
Main heading:Neural networks
Controlled terms:Deep learning - Deep neural networks - Design - Genetic algorithms - Inverse problems - Photonic devices - Silicon photonics
Uncontrolled terms:Fabrication designs - High-resolution numerical simulation - Inverse design methods - Large amounts - Neural network model - Polar coordinate systems - Power splitters - Splitting ratio
Classification code:741.1 Light/Optics
DOI:10.1364/PRJ.416294
Funding details: Number: 12004421, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61635013, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;
Funding text:Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (12004421, 61635013, 61675231); Youth Innovation Promotion Association of Chinese Academy of Sciences (2016535); West Light Foundation of the Chinese Academy of Sciences (XAB2017A09); Natural Science Basic Research Program of Shaanxi (2019JQ-447); Research Project of Xi'an Postdoctoral Innovation Base (201903).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210809951158
Title:Extended field of view of light-sheet fluorescence microscopy by scanning multiple focus-shifted Gaussian beam arrays????(Open Access)
Authors:Liu, Chao (1, 2); Bai, Chen (1); Yu, Xianghua (1); Yan, Shaohui (1); Zhou, Yuan (1, 2); Li, Xing (1, 2); Min, Junwei (1); Yang, Yanlong (1); Dan, Dan (1); Yao, Baoli (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and PrecisionMechanics, Chinese Academy of Sciences, Xi’an, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:4
Issue date:February 15, 2021
Publication year:2021
Pages:6158-6168
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:OSA - The Optical Society
Abstract:Light-sheet fluorescence microscopy (LSFM) facilitates high temporal-spatial resolution, low photobleaching and phototoxicity for long-term volumetric imaging. However, when a high axial resolution or optical sectioning capability is required, the field of view (FOV) is limited. Here, we propose to generate a large FOV of light-sheet by scanning multiple focus-shifted Gaussian beam arrays (MGBA) while keeping the high axial resolution. The positions of the beam waists of the multiple Gaussian beam arrays are shifted in both axial and lateral directions in an optimized arranged pattern, and then scanned along the direction perpendicular to the propagation axis to form an extended FOV of light-sheet. Complementary beam subtraction method is also adopted to further improve axial resolution. Compared with the single Gaussian light-sheet method, the proposed method extends the FOV from 12 µm to 200 µm while sustaining the axial resolution of 0.73 µm. Both numerical simulation and experiment on samples are performed to verify the effectiveness of the method.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Number of references:31
Main heading:Gaussian beams
Controlled terms:Fluorescence - Fluorescence microscopy - Gaussian distribution - Numerical methods - Photobleaching
Uncontrolled terms:Axial resolutions - Extended field of views - Lateral directions - Optical sectioning - Propagation axis - Spatial resolution - Subtraction method - Volumetric Imaging
Classification code:711 Electromagnetic Waves - 741.1 Light/Optics - 921.6 Numerical Methods - 922.1 Probability Theory - 931.4 Quantum Theory; Quantum Mechanics
DOI:10.1364/OE.418707
Funding details: Number: 11704405,61905277,61975233,81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020GY-008,2020SF-193, Acronym: -, Sponsor: Key Research and Development Projects of Shaanxi Province;
Funding text:Funding. National Natural Science Foundation of China (11704405, 61905277, 61975233, 81427802); Key Research and Development Projects of Shaanxi Province (2020GY-008, 2020SF-193).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20211910311300
Title:Force and Torque Analysis of Micro-sized Particles in Perfect Optical Vortex Beams
Title of translation:完美涡旋光中微米级粒子的受力与力矩特性分析
Authors:Zhang, Yanan (1, 2); Li, Manman (1); Yan, Shaohui (1); Zhou, Yuan (1, 2); Li, Xing (1, 2); Yao, Baoli (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:3
Issue date:March 25, 2021
Publication year:2021
Article number:0308002
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

Based on the tightly focusing approach, the perfect optical vortex beams are generated at the geometric focal plane. The optical forces and torques exerted on the micro-sized particle in the perfect optical vortex beams are calculated. Numerical results show that the micro-sized particle is trapped on the ring of perfect optical vortex beams and is driven to rotate around the optical axis. The orbital torque will firstly increases and then tends to be stable with the increase of the topological charge value. In addition, the influence of circular polarization state, radial polarization state and azimuthal polarization state on the force and orbital torque of micro-sized particles are investigated in perfect optical vortex beams. The results show that the state of polarization of perfect optical vortex beams will affect the optically induced orbital motion to some extent. The circular polarization state of perfect optical vortex beams is superior to drive the orbital motion of the particle.
© 2021, Science Press. All right reserved.
Number of references:30
Main heading:Vortex flow
Controlled terms:Circular polarization - Torque
Uncontrolled terms:Azimuthal polarization - Circular polarization state - Force and torques - Micro-sized particles - Optical vortex beam - Radial polarization - State of polarization - Topological charges
Classification code:631.1 Fluid Flow, General - 711 Electromagnetic Waves - 931.2 Physical Properties of Gases, Liquids and Solids
DOI:10.3788/gzxb20215003.0308002
Funding details: Number: 11904395,11974417, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:item：National Natural Science Foundation of China（Nos. 11974417，11904395）

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211810295262
Title:Unobtrusive vital signs and activity monitoring based on dual mode fiber
Authors:Xu, Wei (1, 2); Bian, Shihang (3); Dong, Bo (1, 2, 4); Shen, Ying (3); Han, Shuying (3); Yu, Changyuan (5); Zhao, Wei (1, 2, 4); Wang, Yishan (1, 2, 4)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Electronic & Information Engineering, Soochow University, 215006, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; Shanxi; 030006, China; (5) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon; Hong Kong, China
Corresponding author:Dong, Bo(dbo1978@163.com)
Source title:Optical Fiber Technology
Abbreviated source title:Opt. Fiber Technol.
Volume:64
Issue date:July 2021
Publication year:2021
Article number:102530
Language:English
ISSN:10685200
CODEN:OFTEFV
Document type:Journal article (JA)
Publisher:Academic Press Inc.
Abstract:

A solid unobtrusive fiber-optic sensor based on modal interference in dual mode fiber (DMF) embedded in a thin mat is proposed and investigated theoretically and experimentally, realizing real-time vital signs and activity monitoring. The whole sensing setup only consists of one laser diode, one section of DMF, one photo-detector and few standard single mode fibers (SMFs). The DMF fiber is sandwiched into the SMFs using core-offset splicing, i.e., SMF-DMF-SMF structure. The optimal value of the core offset is numerically simulated and experimentally validated. It has to be noted that all the fibers used in the experiment are with 900-μm protection jacket, which can effectively avoid fiber breaking. The proposed sensor is both investigated in different postures and different subjects. And the results of vital signs monitoring performance show great consistency compared with commercial monitors. Besides, the activity monitoring is also addressed with one-second discrimination resolution, identifying three basic states, i.e., on bed, body movement and off bed. It is easy to fabricate and shows great potential in future non-invasive vital signs and activity monitoring applications.
© 2021 Elsevier Inc.
Number of references:29
Main heading:Single mode fibers
Controlled terms:Fiber optic sensors - Fibers - Patient monitoring - Structural optimization
Uncontrolled terms:Activity monitoring - Body movements - Dual-mode fibers - Modal interference - Optimal values - Standard single mode fibers - Vital sign - Vital signs monitoring
Classification code:461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics - 921.5 Optimization Techniques
Numerical data indexing:Size 9.00e-04m
DOI:10.1016/j.yofte.2021.102530
Funding details: Number: Y829321213, Acronym: -, Sponsor: -;Number: 61971372, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:The work is partially financially supported by the CAS Pioneer Hundred Talents Program (Y829321213) and National Natural Science Foundation of China (61971372).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20205009610622
Title:High-performance solid-state photon-enhanced thermionic emission solar energy converters with graded bandgap window-layer
Authors:Yang, Yang (1, 4); Xu, Peng (1, 2); Cao, Weiwei (1, 2, 3); Zhu, Bingli (1, 5); Wang, Bo (1); Bai, Yonglin (1, 4); Qin, Junjun (2, 5); Bai, Xiaohong (4); Chen, Zhen (1)
Author affiliation:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100091, China; (3) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Laboratory of Information Photonic Technique, Xi'an Jiaotong University, Xi'an; 710049, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Yang, Yang(yangyang@opt.cn)
Source title:Journal of Physics D: Applied Physics
Abbreviated source title:J Phys D
Volume:54
Issue:5
Issue date:February 4, 2021
Publication year:2021
Article number:055502
Language:English
ISSN:00223727
E-ISSN:13616463
CODEN:JPAPBE
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:To realize a high-performance solid-state photon-enhanced thermionic emission (SPETE) solar energy converter, in this study, a graded bandgap window layer is therefore adopted, throughout which the bandgap gradation is generated via the variation of Al composition in the layer in the SPETE converter with a GaAs absorber. Based on one-dimension steady-state equation, an analytical model is formed in analyzing performance of the proposed device in our study. Theoretical simulation results indicate that not only are the losses of contact surface recombination being decreased via the bandgap-gradation-induced build-in electric field of the window layer, but also the photon-generated electrons are effectively collected, thereby improving the conversion efficiency. Moreover, the effect of bandgap energy of the contact surface and the width of the window layer on device performance is discussed. A trade-off of high-efficient SPETE converters is therefore realized between large contact surface bandgap and thin window layer width, to which the rationale lies in the improved process of electron collection facilitated by the enhanced build-in electric field rather than reducing the photon absorption in the window layer. Threshold values for barrier height at the emitting interface are presented to guarantee the ideal voltage-current characteristic. It is found that the threshold values of barrier increase with the increase in temperatures.
© 2020 IOP Publishing Ltd.
Number of references:29
Main heading:Solar energy
Controlled terms:Economic and social effects - Electric fields - Electric losses - Energy gap - Equations of state - Gallium arsenide - III-V semiconductors - Photons - Thermionic emission
Uncontrolled terms:Device performance - Electron collections - Energy converters - Improved process - Photon absorptions - Steady state equation - Theoretical simulation - Voltage-current characteristics
Classification code:657.1 Solar Energy and Phenomena - 701.1 Electricity: Basic Concepts and Phenomena - 804 Chemical Products Generally - 931.3 Atomic and Molecular Physics - 971 Social Sciences
DOI:10.1088/1361-6463/abbb04

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212610567802
Title:Dark matter-wave gap solitons of Bose-Einstein condensates trapped in optical lattices with competing cubic-quintic nonlinearities
Authors:Chen, Junbo (1, 2); Zeng, Jianhua (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)
Source title:Chaos, Solitons and Fractals
Abbreviated source title:Chaos Solitons Fractals
Volume:150
Issue date:September 2021
Publication year:2021
Article number:111149
Language:English
ISSN:09600779
CODEN:CSFOEH
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:

Solitons are nonlinear self-sustained wave excitations and probably among the most interesting and exciting emergent nonlinear phenomenon in the corresponding theoretical settings. Bright solitons with sharp peak and dark solitons with central notch have been well known and observed in various nonlinear systems. The interplay of periodic potentials, like photonic crystals and lattices in optics and optical lattices in ultracold atoms, with the dispersion has brought about gap solitons within the finite band gaps of the underlying linear Bloch-wave spectrum and, particularly, the bright gap solitons have been experimentally observed in these nonlinear periodic systems, while little is known about the underlying physics of dark gap solitons. Here, we theoretically and numerically investigate the existence, property and stability of one-dimensional matter-wave gap solitons and soliton clusters of Bose-Einstein condensates trapped in optical lattices with competing cubic-quintic nonlinearity, the higher-order of which is self-defocusing and the lower-order (cubic) one is chosen as self-defocusing or focusing nonlinearities. By means of the conventional linear-stability analysis and direct numerical calculations with initial perturbations, we identify the stability and instability areas of the corresponding dark gap solitons and clusters ones.
© 2021 Elsevier Ltd
Number of references:78
Main heading:Optical lattices
Controlled terms:Bose-Einstein condensation - Control nonlinearities - Crystal lattices - Energy gap - Linear stability analysis - Nonlinear equations - Nonlinear optics - Optical materials - Solitons - Statistical mechanics
Uncontrolled terms:Bose-Einstein condensates - Cubic-quintic nonlinearity - Dark gap soliton - Dark matter - Gap soliton - Matter waves - Nonlinear schrödinge equation - Optical- - Self-defocusing - Wave excitation
Classification code:731.1 Control Systems - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 931.3 Atomic and Molecular Physics - 933.1.1 Crystal Lattice
DOI:10.1016/j.chaos.2021.111149
Funding details: Number: 12074423, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61690222, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61690224, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (NSFC) (Nos. 61690224, 61690222, 12074423).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210109710602
Title:Secondary electron emission characteristics of the Al2O3/MgO double-layer structure prepared by atomic layer deposition
Authors:Cao, Weiwei (1, 2, 3); Wang, Bo (1); Yang, Yang (1); Zhu, Bingli (1, 5); Guo, Junjiang (3, 4, 5); Xu, Peng (1, 3, 6); Bai, Xiaohong (1, 6); Qin, Junjun (1, 5); Wang, Chao (1, 5); Zhu, Jingping (2); Bai, Yonglin (1, 5)
Author affiliation:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100091, China; (4) Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronics & Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (5) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (6) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; Shanxi; 030006, China
Corresponding author:Bai, Yonglin(baiyonglin@opt.ac.cn)
Source title:Ceramics International
Abbreviated source title:Ceram Int
Volume:47
Issue:7
Issue date:April 1, 2021
Publication year:2021
Pages:9866-9872
Language:English
ISSN:02728842
CODEN:CINNDH
Document type:Journal article (JA)
Publisher:Elsevier Ltd
Abstract:As a secondary electron emission layer, an Al2O3/MgO double-layer structure is fabricated by atomic layer deposition (ALD) technology. The thickness range from 1 nm to 4 nm of the top Al2O3 layer deposited on 20 nm MgO creates a double-layer. The morphology of the cross section, element distribution, surface roughness, X-ray diffraction, and secondary electron yield (SEY) values were measured by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), atomic force microscopy (AFM) and secondary electron emission (SEE) measurement systems. The SEE characteristics of the MgO single layer, Al2O3 single layer and MgO/Al2O3 double-layer were measured. The maximum SEY of a single MgO layer reached 6.2@600 eV, and the maximum SEY of a single Al2O3 layer reached 3.92@400 eV. The SEY of the Al2O3/MgO double-layer decreased when the Al2O3 thickness ranged from 1 nm to 4 nm, and the SEY reduction value of the double-layer decreased as the Al2O3 thickness increased. Finally, Dionne's semiempirical SEE model was employed to explain the SEE yield of the prepared composite film structures. These results are useful for depositing a secondary electron emission layer in the channel of microchannel plates.
© 2020
Number of references:29
Main heading:Atomic layer deposition
Controlled terms:Alumina - Aluminum oxide - Atomic force microscopy - Composite films - Composite structures - Electrons - Energy dispersive spectroscopy - Magnesia - Morphology - Oxide minerals - Scanning electron microscopy - Secondary emission - Surface roughness
Uncontrolled terms:Double layer structure - Element distribution - Energy dispersive spectroscopies (EDS) - Measurement system - Micro channel plate - Reduction values - Secondary electron emissions - Secondary electron yield
Classification code:408.2 Structural Members and Shapes - 482.2 Minerals - 741.3 Optical Devices and Systems - 804.2 Inorganic Compounds - 813.1 Coating Techniques - 931.2 Physical Properties of Gases, Liquids and Solids
Numerical data indexing:Size 1.00e-09m to 4.00e-09m, Size 2.00e-08m
DOI:10.1016/j.ceramint.2020.12.128
Funding details: Number: 6140721010203, Acronym: -, Sponsor: -;Number: 11675258,11803074,61904202, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDA17010203, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018JM6059, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;
Funding text:This work was financially supported by the National Natural Science Foundation of China (Grant No. 61904202, Grant No. 11803074, Grant No. 11675258), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17010203), the Shaanxi Natural Science Basic Research Project (Grant No. 2018JM6059) and the Equipment Pre-research Field Fund (Grant No. 6140721010203).This work was financially supported by the National Natural Science Foundation of China (Grant No. 61904202 , Grant No. 11803074 , Grant No. 11675258 ), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17010203 ), the Shaanxi Natural Science Basic Research Project (Grant No. 2018JM6059 ) and the Equipment Pre-research Field Fund (Grant No. 6140721010203 ).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211910328976
Title:A sealed X-ray microchannel plate imager with CsI photocathode to improve quantitative precision of framing camera
Authors:Yang, Yang (1, 2); Zhu, Bingli (1, 2); Gou, Yongsheng (1); Chen, Zhen (1, 2); Bai, Xiaohong (1, 5); Qin, Junjun (1, 5); Bai, Yonglin (1, 2); Liu, Baiyu (1); Cao, Weiwei (1, 4); Wang, Bo (1, 2); Xu, Peng (1, 3)
Author affiliation:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100091, China; (4) Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, Xi'an Jiaotong University, Xi'an; 710049, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Bai, Yonglin(baiyonglin@opt.ac.cn)
Source title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Abbreviated source title:Nucl Instrum Methods Phys Res Sect A
Volume:1005
Issue date:July 21, 2021
Publication year:2021
Article number:165404
Language:English
ISSN:01689002
CODEN:NIMAER
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

In this paper, we propose a hermetically sealed X-ray microchannel plate imager as a more effective and stable alternative to the traditional open-structured imager. With two microstrip photocathodes of 100 nm Au and 100 nm CsI, respectively, the proposed imager has a measured exposure time of 65 ps when applied with a 200 ps width gate pulse. The static response test shows that the image intensity of the CsI microstrip photocathode is 3.4 times that of the Au microstrip photocathode when illuminated by a non-monochromatic portable X-ray source with high energy photons. The sealed imager not only enhances the sensitivity and stability of the framing camera, but also has the potential to reduce crosstalks and artifacts, thus further improves the precision of measurement in practice.
© 2021
Number of references:24
Main heading:Cameras
Controlled terms:Cesium iodide - Field emission cathodes - Image enhancement - Image storage tubes - Microchannels - Photocathodes - X ray detectors
Uncontrolled terms:CsI photocathodes - Exposure-time - Framing Camera - Fusion diagnosis - Hermetically sealed - Micro channel plate - Micro-channel plate - Micro-strips - Ultra-fast diagnostic - X-ray detector
Classification code:714.1 Electron Tubes - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 804 Chemical Products Generally
Numerical data indexing:Size 1.00E-07m, Time 2.00E-10s, Time 6.50E-11s
DOI:10.1016/j.nima.2021.165404
Funding details: Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;Number: XAB2016B25, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 6140721010203, Acronym: -, Sponsor: -;
Funding text:This research was funded by the Equipment Pre-research Field Fund, China (Grant No. 6140721010203 ) and by the West Light Foundation of the Chinese Academy of Sciences (Grant No. XAB2016B25 ).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010360135
Title:Development Current Status and Trend Analysis of Satellite Laser Communication(Invited)
Title of translation:卫星激光通信发展现状与趋势分析(特邀)
Authors:Gao, Duorui (1, 2, 3); Xie, Zhuang (1, 2, 3); Ma, Rong (1, 2, 3); Wang, Wei (1, 2); Bai, Zhaofeng (1, 2); Jia, Shuaiwei (1, 2, 3); Shao, Wen (1, 2, 3); Xie, Xiaoping (1, 2, 3)
Author affiliation:(1) Laboratory of Photonics and Network, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Wang, Wei(wangwei2012@opt.ac.cnemailxxp@opt.ac.cn)Xie, Xiaoping(xxp@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:4
Issue date:April 25, 2021
Publication year:2021
Article number:0406001
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

Satellite laser communication, with its wide bandwidth and no electromagnetic spectrum constraints, has become an effective means to solve the bandwidth bottleneck of satellite microwave communication, alleviate the shortage of satellite spectrum resources and realize high-speed satellite communication. This paper introduces the system composition and characteristics of satellite laser communication, and analyzes the development context, latest progress and future development plans of satellite laser communication technology at international and domestic. Combined with the requirements of future space network and deep-space exploration, this paper summarizes from five aspects of high-speed, deep-space, integration, networking and all-optical, and discusses the key technologies involved in the future, which can provide reference for the research of satellite laser communication technology in China.
© 2021, Science Press. All right reserved.
Number of references:99
Main heading:Optical communication
Controlled terms:Bandwidth - Interplanetary flight - Satellite communication systems - Satellites - Space research
Uncontrolled terms:Bandwidth bottlenecks - Deep-space exploration - Development plans - Electromagnetic spectra - Microwave communications - Satellite communications - Satellite laser communication - System composition
Classification code:655.2 Satellites - 655.2.1 Communication Satellites - 656.1 Space Flight - 656.2 Space Research - 716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems
DOI:10.3788/gzxb20215004.0406001
Funding details: Number: 61231012, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 91638101, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China(Nos.61231012, 91638101).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212310453809
Title:All-optical tunable fiber filter based on a few-mode optical fiber mode interferometer coated with graphene epoxy resin composite material
Authors:Chen, Enqing (1, 2); Dong, Bo (3); Li, Yang (1, 2); Li, Ziwan (1, 2); Wang, Xiaoli (1, 2); Zhao, Yudi (1); Xu, Wei (1, 2); Zhao, Wei (1, 2, 4); Wang, Yishan (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) College of new materials and new energy, Shenzhen Technology University, Shenzhen; 518118, China; (4) Collaborative Innovation Center of Extreme Optics Shanxi University, Taiyuan; 030006, China
Corresponding author:Dong, Bo(dongbo@sztu.edu.cn)
Source title:Optics Communications
Abbreviated source title:Opt Commun
Volume:497
Issue date:October 15, 2021
Publication year:2021
Article number:127140
Language:English
ISSN:00304018
CODEN:OPCOB8
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

A compact all-optical tunable fiber filter based on a few-mode optical fiber modal interferometer coated with graphene epoxy resin composite material is proposed and experimentally demonstrated. The interferometer is constructed with a 2-cm FMF connected to two single mode fibers. After coating the graphene epoxy resin composite material on the outside of the interferometer, it shows the all-optical wavelength tunability, and experimental results show that the wavelength shift changes quasilinearly with the pump power changing. The wavelength tunable range reaches 5.062 nm with a step of 0.016 nm/mw. It is expected to have practical application in optical communication, fiber sensing, fiber laser and optical spectrum analysis.
© 2021 Elsevier B.V.
Number of references:18
Main heading:Graphene
Controlled terms:Composite materials - Epoxy resins - Fiber lasers - Interferometers - Optical communication - Single mode fibers - Spectrum analysis
Uncontrolled terms:All optical - Composites material - Epoxy resin composites - Few-mode optical fiber - Fiber mode - Filter-based - Modal interferometers - Optical- - Tunable fiber filter - Tunable modal interferometer filter
Classification code:717.1 Optical Communication Systems - 741.1.2 Fiber Optics - 744.4 Solid State Lasers - 761 Nanotechnology - 804 Chemical Products Generally - 815.1.1 Organic Polymers - 941.3 Optical Instruments - 951 Materials Science
Numerical data indexing:Size 1.60E-11m, Size 2.00E-02m, Size 5.062E-09m
DOI:10.1016/j.optcom.2021.127140
Funding text:This work is supported by the CAS Pioneer Hundred Talents Program, ChinaY829321213.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211310138894
Title:Prediction of milling forces in high-speed milling optical grade SiCp/Al composites
Title of translation:高速铣削光学级SiCp/Al复合材料的铣削力预测
Authors:Guo, Lin (1); Huang, Shu-Tao (1); Yang, Hai-Cheng (2); Xu, Li-Fu (3); Zhang, Yu-Pu (3)
Author affiliation:(1) Shenyang Ligong University, Shenyang; 110159, China; (2) Xian Institute of Applied Optics and Precision Mechanics of CAS, Xi'an; 710068, China; (3) Shenyang Ligong University, School of Mechanical Engineering, Shenyang; 110159, China
Corresponding author:Huang, Shu-Tao(syithst@sylu.edu.cnemailyyhhcc62@163.com)Yang, Hai-Cheng(yyhhcc62@163.com)
Source title:Guangxue Jingmi Gongcheng/Optics and Precision Engineering
Abbreviated source title:Guangxue Jingmi Gongcheng
Volume:29
Issue:1
Issue date:January 2021
Publication year:2021
Pages:117-129
Language:Chinese
ISSN:1004924X
CODEN:GJGOF4
Document type:Journal article (JA)
Publisher:Chinese Academy of Sciences
Abstract:Under the conditions of down and up milling, to compare the variation characteristics of milling forces of a polycrystalline-diamond single-tooth end mill with a diamond grain size of 32 μm when milling optical-grade SiCp/Al composites at high speed, the effects of the milling method and milling amounts on milling forces characteristics were studied. The empirical formulae of milling forces were also established based on a multiple linear regression analysis method. An L9(34) orthogonal cutting experiment was conducted to study the influence of milling amounts on the cutting force under the two conditions. A rotary dynamometer was then used to collect the signals of each milling force, and an empirical formula of tangential force Ft, radial force Fr, axial force Fz, and total milling force Ftotal was then established using the multiple linear regression analysis method. Experimental results demonstrated that the milling force calculated using the established regression formula was significantly high, and the average error of the model was within 10%. Under the two milling conditions, the highest level of influence on each milling force was the axial cutting depth, followed by the feed per tooth and cutting speed. To obtain smaller cutting forces, a smaller axial cutting depth should first be selected, followed by a smaller feed per tooth and a higher cutting speed.
© 2021, Science Press. All right reserved.
Number of references:28
Main heading:Milling (machining)
Controlled terms:Cutting - Linear regression
Uncontrolled terms:High speed milling - Milling conditions - Multiple linear regression analysis - Orthogonal cutting - Polycrystalline diamonds - Regression formulas - SiCp/Al composites - Variation characteristics
Classification code:604.2 Machining Operations - 922.2 Mathematical Statistics
Numerical data indexing:Percentage 1.00e+01%, Size 3.20e-05m
DOI:10.37188/OPE.20212901.0117

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20205109635226
Title:Super-resolution and optical sectioning integrated structured illumination microscopy
Authors:Dan, Dan (1); Gao, Peng (2); Zhao, Tianyu (1, 3); Dang, Shipei (1, 3); Qian, Jia (1, 3); Lei, Ming (1); Min, Junwei (1); Yu, Xianghua (1); Yao, Baoli (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Journal of Physics D: Applied Physics
Abbreviated source title:J Phys D
Volume:54
Issue:7
Issue date:February 4, 2021
Publication year:2021
Article number:074004
Language:English
ISSN:00223727
E-ISSN:13616463
CODEN:JPAPBE
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:Super-resolution structured illumination microscopy (SR-SIM) has attracted a great deal of attention in the past few decades. As a wide-field imaging technique, SR-SIM usually suffers from issues relating to out-of-focus background, particularly when imaging thick samples. In this study, we develop an integrated SIM with simultaneous SR and optical sectioning (OS) capabilities, facilitating SR imaging of stacked optical sections, with the out-of-focus background suppressed. The combination of the merits of SR and OS is realized by means of a new image reconstruction algorithm. We confirm the validity of the integrated SIM, both experimentally and in simulation. We anticipate that this integrated SIM will assist biologists in obtaining much clearer SR images in relation to thick specimens.
© 2020 IOP Publishing Ltd.
Number of references:30
Main heading:Image reconstruction
Controlled terms:Imaging techniques - Optical resolving power
Uncontrolled terms:Image reconstruction algorithm - Optical sectioning - Optical sections - Out-of-focus - Structured illumination microscopy - Super resolution - Thick samples - Wide field imaging
Classification code:741.1 Light/Optics - 746 Imaging Techniques
DOI:10.1088/1361-6463/abc4a8

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211210104091
Title:Antireflective and superhydrophilic structure on graphite written by femtosecond laser????(Open Access)
Authors:Lou, Rui (1, 2); Li, Guangying (1, 2); Wang, Xu (1); Zhang, Wenfu (1); Wang, Yishan (1); Zhang, Guodong (3); Wang, Jiang (3); Cheng, Guanghua (3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Electronic Information College, Northwestern Polytechnical University, Xi’an; 710072, China
Corresponding author:Cheng, Guanghua(guanghuacheng@nwpu.edu.cn)
Source title:Micromachines
Abbreviated source title:Micromachines
Volume:12
Issue:3
Issue date:March 2021
Publication year:2021
Pages:1-11
Article number:236
Language:English
E-ISSN:2072666X
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:Antireflection and superhydrophilicity performance are desirable for improving the properties of electronic devices. Here, we experimentally provide a strategy of femtosecond laser preparation to create micro-nanostructures on the graphite surface in an air environment. The modified graphite surface is covered with abundant micro-nano structures, and its average reflectance is measured to be 2.7% in the ultraviolet, visible and near-infrared regions (250 to 2250 nm). The wettability transformation of the surface from hydrophilicity to superhydrophilicity is realized. Besides, graphene oxide (GO) and graphene are proved to be formed on the sample surface. This micro-nanostructuring method, which demonstrates features of high efficiency, high controllability, and hazardous substances zero discharge, exhibits the application for functional surface.
© MDPI AG. All rights reserved.
Number of references:50
Main heading:Femtosecond lasers
Controlled terms:Graphene - Graphite - Infrared devices - Nanostructures - Superhydrophilicity
Uncontrolled terms:Electronic device - Functional surfaces - Graphite surfaces - Hazardous substances - Micro-nano structures - Modified graphites - Superhydrophilic structures - Visible and near infrared
Classification code:761 Nanotechnology - 804 Chemical Products Generally - 933 Solid State Physics
Numerical data indexing:Percentage 2.70e+00%, Size 2.50e-07m to 2.25e-06m
DOI:10.3390/mi12030236
Funding details: Number: 61775236, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018YFB1107401, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;
Funding text:Funding: This research was funded by the National Key Research and Development Program (2018YFB1107401) and Natural National Science Foundation of China (NSFC) (61775236).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20210409817755
Title:High-side mode suppression ratio with a high-stability external-cavity diode laser array at 976 nm in a wide temperature and current range
Authors:Liu, Bin (1, 2, 3); Liu, Hui (1); Zhu, Pengfei (3); Liu, Xingsheng (3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi; Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Focuslight Technologies Inc, Shaanxi; Xi'an; 710077, China
Corresponding author:Liu, Hui(huiliu@xpu.edu.cn)
Source title:Optics Communications
Abbreviated source title:Opt Commun
Volume:486
Issue date:May 1, 2021
Publication year:2021
Article number:126792
Language:English
ISSN:00304018
CODEN:OPCOB8
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:A high-side mode suppression ratio (SMSR) and high-stability external-cavity diode laser array employing optical feedback from a volume Bragg grating (VBG) with 15% diffraction efficiency at 976 nm was investigated. Based on the transfer matrix method and on the multimode rate equation, the theoretical model for an external-cavity diode laser at 976 nm was built for different temperature and current values. Both the simulated and the experimental results show that the temperature and the current range of such laser array with a front end reflectivity (Rf) of 0.5% are 10 °C and 15 A broader than that for an external cavity with Rf = 2%. As a result, the external-cavity diode laser array at 976 nm with a Rf value of 0.5% exhibits a high stability in the temperature range of 15–35 °C and from 15 to 50 A. Moreover, it shows an SMSR higher than 30 dB and a power larger than 33.9 W at 50A.
© 2021 Elsevier B.V.
Number of references:21
Main heading:Transfer matrix method
Controlled terms:Diodes - Laser resonators - Semiconductor lasers
Uncontrolled terms:Current range - Current values - External cavity - External-cavity diode laser - Multimode rate equations - Temperature range - Theoretical modeling - Volume bragg grating (VBG)
Classification code:744.4.1 Semiconductor Lasers - 744.7 Laser Components - 921 Mathematics
Numerical data indexing:Decibel 3.00e+01dB, Electric_Current 1.50e+01A, Electric_Current 1.50e+01A to 5.00e+01A, Electric_Current 5.00e+01A, Percentage 1.50e+01%, Percentage 2.00e+00%, Percentage 5.00e-01%, Power 3.39e+01W, Size 9.76e-07m, Temperature 2.83e+02K
DOI:10.1016/j.optcom.2021.126792
Funding details: Number: 2018YFB1107302, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 2018YFB1107303, Acronym: -, Sponsor: National Key Research and Development Program of China;
Funding text:We wish to acknowledge the support of National Key R&D Program of China (2018YFB1107302 and 2018YFB1107303).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213110707042
Title:Design and Modulation Performance of Ultrafast Light-controlled Pulsed X-ray Tube with Photocathode
Title of translation:基于光电阴极的超快X射线源设计及调制性能研究
Authors:Xuan, Hao (1, 2); Liu, Yongan (1); Qiang, Pengfei (1); Su, Tong (1); Yang, Xianghui (1); Sheng, Lizhi (1); Zhao, Baosheng (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:7
Issue date:July 25, 2021
Publication year:2021
Article number:0725001
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

In order to solve the easy-broken structure, low energy efficiency and heat dissipation of the traditional X-ray tube with filament based on thermionic cathode, a novel light-controlled pulsed X-ray tube device is deostrated in this paper. By matching the parameters of photocathode and light source, S20 cathode with high quantum efficiency and LED with 460 nm wavelength were selected. At the same time, the overall structure design of the X-ray tube is determined by the simulation. Finally, the maximum tube current of 2.37 mA is realized, the electron emission efficiency of photocathode is 0.288 mA/lm, and the output X-ray energy is adjustable from 0 to 25 keV. In addition, based on the characteristics of easy-access to be modulated of the light-controlled pulsed X-ray tube, different frequencies input signal restoration experiment and arbitrary contor X-ray restoration experiment was carried out.
© 2021, Science Press. All right reserved.
Number of references:16
Main heading:X rays
Controlled terms:Electron emission - Energy efficiency - Photocathodes - Restoration - Signal reconstruction - Thermionic cathodes - Tubes (components) - Ultrafast lasers - X ray tubes
Uncontrolled terms:Different frequency - Electron emission efficiency - High quantum efficiency - Pulsed X-rays - Signal restoration - Structure design - Tube currents - X-ray energies
Classification code:525.2 Energy Conservation - 619.1 Pipe, Piping and Pipelines - 714.1 Electron Tubes - 716.1 Information Theory and Signal Processing - 744.1 Lasers, General - 932.1 High Energy Physics
Numerical data indexing:Electric_Current 2.37e-03A, Electron_Volt 0.00e+00eV to 2.50e+04eV, Size 4.60e-07m
DOI:10.3788/gzxb20215007.0725001
Funding details: Number: 61901470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: U1931138, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (Nos.61901470, U1931138), the Strategic Pioneer Program on Space Science, Chinese Academy of Science ( No.XDA15020501-04), CAS "Light of West China" Program (No.XAB2018A07), the Foundation of State Key Laboratory of China (No.SKLIPR2021)

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212210433912
Title:Solving, analyzing, manufacturing, and experimental testing of thickness distribution for a cycloid-like variable curvature mirror????(Open Access)
Authors:Xie, Xiaopeng (1); Xu, Liang (2); Wang, Yongjie (2); Shen, Le (2); Fan, Xuewu (1); Fan, Wenhui (3); Li, Chuang (1); Zhao, Hui (1)
Author affiliation:(1) Space Optical Technology Research Department, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi’an; 710119, China; (2) Advanced Optics Manufacturing Center, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi’an; 710119, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi’an; 710119, China
Corresponding author:Zhao, Hui(zhaohui@opt.ac.cn)
Source title:Optics Express
Abbreviated source title:Opt. Express
Volume:29
Issue:12
Issue date:June 7, 2021
Publication year:2021
Pages:18010-18025
Language:English
E-ISSN:10944087
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

A cycloid-like variable curvature mirror (VCM) for zoom-imaging systems was investigated. An analytical-deformation solution to a thin-elastic plate with a cycloid-like thickness distribution and simply supported boundary condition under uniform pressure was found using a small parameter method. The finite-element analysis of the thin-elastic plate and designed VCM showed a good correlation with the analytical solution. The VCM was manufactured and polished to the initial shape with a root mean square (RMS) of 1/80λ. Finally, with air-pressure-based actuation testing under 0.07 MPa, the VCM deforms approximately 36.89 µm and maintains the RMS surface performance of 1/10λ, 1/40λ with and without spherical aberrations, respectively.
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Number of references:29
Main heading:Optical testing
Controlled terms:Aberrations - Mirrors - Thickness control
Uncontrolled terms:Experimental testing - Good correlations - Small parameter method - Spherical aberrations - Surface performance - Thickness distributions - Thin elastic plates - Variable curvature mirror
Classification code:731.3 Specific Variables Control - 741.3 Optical Devices and Systems
Numerical data indexing:Pressure 7.00e+04Pa
DOI:10.1364/OE.426989
Funding details: Number: 2016KJXX-08, Acronym: -, Sponsor: Research Fund for Young Star of Science and Technology in Shaanxi Province;Number: XAB2015A09, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;
Funding text:Funding. West Light Foundation of the Chinese Academy of Sciences (XAB2015A09); Research Fund for Young Star of Science and Technology in Shaanxi Province (2016KJXX-08); China Scholarship Council.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold

Accession number:20213810900937
Title:Collective multipartite Einstein-Podolsky-Rosen steering via cascaded four-wave mixing of rubidium atoms
Authors:Liu, Yang (1, 2, 3); Cai, Yin (1); Luo, Binshuo (1); Yan, Jin (1); Niu, Mengqi (1); Li, Feng (1); Zhang, Yanpeng (1)
Author affiliation:(1) Key Laboratory for Physical Electronics and Devices, Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, Xi'An Jiaotong University, Xi'an; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Cai, Yin(caiyin@xjtu.edu.cn)
Source title:Physical Review A
Abbreviated source title:Phys. Rev. A
Volume:104
Issue:3
Issue date:September 2021
Publication year:2021
Article number:033704
Language:English
ISSN:24699926
E-ISSN:24699934
Document type:Journal article (JA)
Publisher:American Physical Society
Abstract:

Collective multipartite Einstein-Podolsky-Rosen (EPR) steering is a type of quantum correlation shared among n parties, where the EPR paradox of one party can be realized only by performing local measurements on all the remaining n-1 parties. Here, we propose an efficient method to produce collective multipartite EPR steering via symmetrically and asymmetrically cascading parametric amplification processes, i.e., four-wave mixing (FWM) of rubidium atoms. The simplified collective-steering criterion is introduced using the Coffman-Kundu-Wootters monogamy relation. Moreover, by actively adjusting the parametric gains, the collective EPR steerability is optimized in our schemes. We find that the scale of collective steering can be extended by cascading more FWMs; in particular, introducing optical loss is useful for generating collective steering with more parties only in the asymmetry structure. Our results pave the way for the construction of quantum networks and provide a promising candidate for one-sided device-independent quantum cryptography among multiple users.
© 2021 American Physical Society.
Number of references:64
Main heading:Four wave mixing
Controlled terms:Optical parametric amplifiers - Quantum cryptography - Quantum theory - Rubidium
Uncontrolled terms:Cascaded four-wave mixing - Einstein-Podolsky-rosen - Local measurement - Parametric amplification - Parametric gain - Quantum correlations - Quantum network - Rubidium atoms
Classification code:549.1 Alkali Metals - 714 Electronic Components and Tubes - 931.4 Quantum Theory; Quantum Mechanics
DOI:10.1103/PhysRevA.104.033704

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213410811243
Title:Lensless multimode fiber imaging based on wavefront shaping
Authors:Zhang, Zaikun (1, 2, 3, 4); Kong, Depeng (3); Geng, Yi (1, 2, 3); Chen, Hui (1, 2, 3); Wang, Ruiduo (1, 2, 3); Da, Zhengshang (4); He, Zhengquan (3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Laboratory of Information Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) The Advanced Optical Instrument Research Department, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China
Corresponding author:He, Zhengquan(zhqhe@opt.ac.cn)
Source title:Applied Physics Express
Abbreviated source title:Appl. Phys. Express
Volume:14
Issue:9
Issue date:September 2021
Publication year:2021
Article number:092002
Language:English
ISSN:18820778
E-ISSN:18820786
Document type:Journal article (JA)
Publisher:IOP Publishing Ltd
Abstract:

In this letter, we proposed a compact multimode fiber (MMF)-based laser scanning endoscope (LSE) using wavefront shaping with a liquid crystal spatial light modulator. Experimentally, we demonstrated the lensless imaging capability of the LSE using a negative USAF-1951 test target placed near the distal MMF facet, obtaining ~7000-pixel images with micro-level spatial resolution and high contrast across a 105 μm field of view. This study proves the feasibility of a single MMF imaging without mechanical scanning, and also paves the way for ultra-thin micro-endoscopic imaging.
© 2021 The Japan Society of Applied Physics.
Number of references:30
Main heading:Multimode fibers
Controlled terms:Endoscopy - Light modulators - Liquid crystals - Wavefronts
Uncontrolled terms:Endoscopic imaging - Laser scanning - Lens-less imaging - Liquid crystal spatial light modulators - Mechanical scanning - Multi-mode fibers (MMF) - Spatial resolution - Wave front shaping
Classification code:461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics
Numerical data indexing:Size 1.05e-04m
DOI:10.35848/1882-0786/ac19d4
Funding details: Number: 61535015, Acronym: -, Sponsor: National Natural Science Foundation of China;
Funding text:National Natural Science Foundation of China (61535015).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211610231609
Title:Disentangled Representation Learning for Cross-modal Biometric Matching
Authors:Ning, Hailong (1); Zheng, Xiangtao (2); Lu, Xiaoqiang (3); Yuan, Yuan (4)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi'An, ShannXi, China, 710119 (e-mail: ninghailong93@gmail.com); (2) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China, 710119 (e-mail: xiangtaoz@gmail.com); (3) OPTical IMagery Analysis and Learning, Chinese Academy of Sciences, Xi'an, China, 710119 (e-mail: luxq666666@gmail.com); (4) OPTical IMagery Analysis and Learning, Chinese Academy of Sciences, Xi'an, China, (e-mail: y.yuan1.ieee@gmail.com)
Source title:IEEE Transactions on Multimedia
Abbreviated source title:IEEE Trans Multimedia
Issue date:2021
Publication year:2021
Language:English
ISSN:15209210
E-ISSN:19410077
CODEN:ITMUF8
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Cross-modal biometric matching (CMBM) aims to determine the corresponding voice from a face, or identify the corresponding face from a voice. Recently, many CMBM methods have been proposed by forcing the distance between two modal features to be narrowed. However, these methods ignore the alignability between the two modal features. Because the feature is extracted under the supervision of identity information from single modal data, it can only reflect the identity information of single modal data. In order to address this problem, a disentangled representation learning method is proposed to disentangle the alignable latent identity factors and nonalignable the modality-dependent factors for CMBM. The proposed method consists of two main steps: 1) feature extraction and 2) disentangled representation learning. Firstly, an image feature extraction network is adopted to obtain face features, and a voice feature extraction network is applied to learn voice features. Secondly, a disentangled latent variable is explored to disentangle the latent identity factors that are shared across the modalities from the modality-dependent factors. The modality-dependent factors are filtered out, while the latent identity factors from the two modalities are enforced to be narrowed to align the same identity information. Then, the disentangled latent identity factors are considered as pure identity information to bridge the two modalities for cross-modal verification, 1:N matching, and retrieval. Note that the proposed method learns the identity information from the input face images and voice segments with only identity label as supervised information. Extensive experiments on the challenging VoxCeleb dataset demonstrate the proposed method outperforms the state-of-the-art methods.
IEEE
Main heading:Information filtering
Controlled terms:Biometrics - Extraction - Feature extraction - Learning systems - Modal analysis
Uncontrolled terms:Biometric matching - Dependent factors - Identity information - Identity labels - Image feature extractions - Latent variable - Learning methods - State-of-the-art methods
Classification code:461 Bioengineering and Biology - 802.3 Chemical Operations - 903.1 Information Sources and Analysis - 921 Mathematics
DOI:10.1109/TMM.2021.3071243

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210609889094
Title:Dark matter-wave gap solitons in dense ultracold atoms trapped by a one-dimensional optical lattice
Authors:Li, Jiawei (1, 2, 3); Zeng, Jianhua (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, Xi'An Jiaotong University, Xi'an; 710049, China; (3) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)
Source title:Physical Review A
Abbreviated source title:Phys. Rev. A
Volume:103
Issue:1
Issue date:January 2021
Publication year:2021
Article number:A17
Language:English
ISSN:24699926
E-ISSN:24699934
Document type:Journal article (JA)
Publisher:American Physical Society
Abstract:Optical lattices have been used as a versatile toolbox to control Bose-Einstein condensates (BECs) in recent years, and a wealth of emergent nonlinear phenomena have been found, including bright gap solitons and dark ones, among which the former has been realized in experiments. The latter, however, has only theoretical results and its fundamental properties are still not well understood. Here we theoretically and numerically explore an open issue of creating stable matter-wave dark gap solitons in a one-dimensional optical lattice, onto which the BECs with self-defocusing quintic nonlinearity are loaded. Using linear-stability analysis and direct simulations, the formation, structures, and properties of dark gap solitons in quintic nonlinearity have been compared to those upheld by cubic Kerr nonlinearity. In particular, we uncover that the dark gap solitons and soliton clusters are robustly stable in the first finite band gap of the underlying linear spectrum, and are hard to be stabilized in the second gap. The predicted dark gap solitons are observable in current experiments on dense ultracold atoms, using an optical lattice technique, and in the optics domain for nonlinear light propagation in periodic optical media with quintic nonlinearity.
© 2021 American Physical Society.
Number of references:74
Main heading:Optical lattices
Controlled terms:Bose-Einstein condensation - Crystal lattices - Dark Matter - Energy gap - Linear stability analysis - Nonlinear optics - Optical materials - Solitons - Statistical mechanics
Uncontrolled terms:Bose-Einstein condensates - Direct simulation - Fundamental properties - Kerr nonlinearity - Non-linear phenomena - One dimensional optical lattice - Quintic nonlinearity - Soliton clusters
Classification code:741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 922.2 Mathematical Statistics - 931.2 Physical Properties of Gases, Liquids and Solids - 933.1.1 Crystal Lattice
DOI:10.1103/PhysRevA.103.013320
Funding text:This work was supported by the National Natural Science Foundation of China (NSFC) (Grants No. 61690224, No. 61690222, No. 12074423), the Major Science and Technology Infrastructure Pre-research Program of the CAS (Grant No. J20-021-III), the Natural Science Basic Research Program of Shaanxi (Grant No. 2019JCW-03), and the Key Deployment Research Program of XIOPM (Grant No. S19-020-III).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211710255916
Title:Terahertz signatures and quantitative analysis of glucose anhydrate and monohydrate mixture
Authors:Yan, Hui (1, 2, 3); Fan, Wenhui (1, 3, 4); Chen, Xu (1); Liu, Lutao (1, 3); Wang, Hanqi (1, 3); Jiang, Xiaoqiang (1, 3)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) College of Science, Zhongyuan University of Technology, Zhengzhou 450007, China; Zhengzhou Key Laboratory of Low-dimensional Quantum Materials and Devices; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China
Corresponding author:Fan, Wenhui(fanwh@opt.ac.cn)
Source title:Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Abbreviated source title:Spectrochim. Acta Part A Mol. Biomol. Spectrosc.
Volume:258
Issue date:September 5, 2021
Publication year:2021
Article number:119825
Language:English
ISSN:13861425
CODEN:SAMCAS
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Glucose, as the main energy carrier and significant source of nutrition, generally comes in two available forms of anhydrate and monohydrate in commercial production. Considering their respective application occasions, proper identification of glucose in single composition or binary-mixture and quantification of the mixture are crucial in industry monitoring to guarantee merchandise quality. Simultaneously, public confusions of glucose are rather ubiquitous partly due to anhydrate and monohydrate with identical white crystalline appearance. In this paper, utilizing the molecular fingerprints of terahertz (THz) technology that are corresponding to structural characteristics of anhydrous and hydrated form, THz signatures of glucose anhydrate, monohydrate and their mixture, as well as THz spectral transformation from monohydrate to anhydrate with the dehydrating process are systematically studied. Some visible peaks of monohydrate were noted at 1.82 and 1.99 THz signifying the presence of hydrated structure. However, with the dehydrating process, the peaks related to the hydrated structure are not very apparent when the peaks at 1.44 and 2.08 THz appear due to changes in the molecular structure of anhydrate, which provide clear indication for hydrogen-bond network reconstruction at the micro level. Furthermore, characteristic peaks at 1.44 and 1.82 THz can be specified as the main quantitative indicators for quantitative detection. The linear relationships between the amplitudes of characteristic peaks and the percentage compositions of anhydrate and monohydrate are revealed. Three commercially available brands of edible glucose powder A, B, C were effectively identified by THz signatures. While powder C was recognized as binary-mixture and the proportion of anhydrate and monohydrate was further quantified. THz spectroscopy technology has advantages of direct recognition, simple quantitative model based on THz absorption peaks, and no need for complicated chemical treatment. It may be potentially shed light on industrial monitoring of glucose production and other related mixture in the future.
© 2021 Elsevier B.V.
Number of references:47
Main heading:Chemical analysis
Controlled terms:Binary mixtures - Dehydration - Glucose - Hydration - Hydrogen bonds - Terahertz spectroscopy
Uncontrolled terms:Anhydrate and monohydrate - Anhydrates - Characteristic peaks - Commercial productions - Energy carriers - Molecular fingerprint - Structural characteristics - Tera Hertz - Terahertz signature - Terahertz technology
Classification code:801.4 Physical Chemistry - 802.2 Chemical Reactions - 804 Chemical Products Generally - 804.1 Organic Compounds - 931.1 Mechanics
Numerical data indexing:Frequency 1.44E+12Hz, Frequency 1.82E+12Hz, Frequency 1.99E+12Hz, Frequency 2.08E+12Hz
DOI:10.1016/j.saa.2021.119825
Funding details: Number: LSIT201913N, Acronym: -, Sponsor: -;Number: 61675230,61905276, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This work was supported by the National Natural Science Foundation of China ( 61675230 , 61905276 ); Open Research Fund of Key Laboratory of Spectral Imaging Technology, Chinese Academy of Sciences ( LSIT201913N ).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509853416
Title:High-speed focusing and scanning light through a multimode fiber based on binary phase-only spatial light modulation
Authors:Geng, Yi (1, 2); Chen, Hui (1, 2); Zhang, Zaikun (1, 2); Zhuang, Bin (1, 2); Guo, Haitao (1, 2); He, Zhengquan (1); Kong, Depeng (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Guo, Haitao(guoht_001@opt.ac.cnemailzhqhe@opt.ac.cn)He, Zhengquan(zhqhe@opt.ac.cn)
Source title:Applied Physics B: Lasers and Optics
Abbreviated source title:Appl Phys B
Volume:127
Issue:2
Issue date:February 2021
Publication year:2021
Article number:25
Language:English
ISSN:09462171
CODEN:APBOEM
Document type:Journal article (JA)
Publisher:Springer Science and Business Media Deutschland GmbH
Abstract:A binary phase-only modulation technique was proposed to focus and scan light through a multimode fiber (MMF) based on spatial light modulator (SLM). For the same number of modulation modes, the number of iterations using this method is only 1/256 of that using phase-only iterative optimization or 1/3 of that using phase-only computation optimization, and the modulation time is at least one to two orders of magnitude shorter than previous wavefront shaping systems. Focusing and scanning light through an MMF with a 105 μm core diameter and 5 m length was achieved experimentally. This method can be extended to focus and scan light at multiple planes along the axial direction by modifying the input wavefront accordingly.
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
Number of references:38
Main heading:Light modulators
Controlled terms:Iterative methods - Light modulation - Multimode fibers - Wavefronts
Uncontrolled terms:Computation optimizations - Focusing and scanning - Iterative Optimization - Multi-mode fibers (MMF) - Number of iterations - Orders of magnitude - Spatial light modulation - Spatial light modulators
Classification code:741.1 Light/Optics - 741.1.2 Fiber Optics - 921.6 Numerical Methods
DOI:10.1007/s00340-021-07573-1
Funding details: Number: 61535015, Acronym: NSFC, NNSF, NNSFC, Sponsor: National Natural Science Foundation of China;Number: 61935006l, Acronym: NSFC, NNSF, NNSFC, Sponsor: National Natural Science Foundation of China;
Funding text:This study was funded by the National Natural Science Foundation of China (NSFC) (Nos. 61535015 and 61935006l), the National Key Research and Development Program of China (Grant No. 2016YFB0303804) and CAS Interdisciplinary Innovation Team Project (JCTD-2018-19).

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20210509869988
Title:Flower-Shaped Optical Vortex Array
Authors:Fan, Haihao (1, 2); Zhang, Hao (1); Cai, Chenyuan (3); Tang, Miaomiao (1); Li, Hehe (1); Tang, Jie (2); Li, Xinzhong (1, 2)
Author affiliation:(1) School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) Luoyang First Senior High School, Luoyang; 471023, China
Corresponding author:Li, Xinzhong(xzli@haust.edu.cnemailxzli@haust.edu.cn)Li, Xinzhong(xzli@haust.edu.cn)
Source title:Annalen der Physik
Abbreviated source title:Ann Phys Leipzig
Volume:533
Issue:4
Issue date:April 2021
Publication year:2021
Article number:2000575
Language:English
ISSN:00033804
E-ISSN:15213889
CODEN:ANPYA2
Document type:Journal article (JA)
Publisher:John Wiley and Sons Inc
Abstract:

Herein, the generation of an optical vortex array dubbed the flower-shaped optical vortex array (FOVA) is proposed and experimentally demonstrated using a single optical path interference method. FOVA is generated by the superposition of even and odd Ince–Gaussian (IG) beams, which have the same degree m and different order p. The number of optical vortices (OVs) in the FOVA is determined based on the values of order p and degree m of the even and odd IG beams. Furthermore, the positive sign of the OVs in the array can be transformed to negative by adding a specific initial phase difference. The OVs vanish and then recover as the initial phase difference increases from 0 to 2π. Moreover, the gradient force and energy flow distribution of the FOVA are studied. The OVA with flower-shaped structure generated herein has potential significance in applications, such as microparticle manipulation and optical measurements.
© 2021 Wiley-VCH GmbH
Number of references:52
Main heading:Vortex flow
Controlled terms:Gaussian beams - Optical data processing - Particle optics
Uncontrolled terms:Flower-shaped - Gradient force - Interference methods - Microparticle manipulations - Optical measurement - Optical path - Optical vortices - Phase difference
Classification code:631.1 Fluid Flow, General - 711 Electromagnetic Waves - 723.2 Data Processing and Image Processing - 932.1 High Energy Physics
DOI:10.1002/andp.202000575
Funding details: Number: 21zx002, Acronym: -, Sponsor: -;Number: 11704098,11974101,11974102, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLST201901, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;
Funding text:H.F. and H.Z. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (11974102, 11704098, and 11974101), State Key Laboratory of Transient Optics and Photonics (SKLST201901), and Key Scientific Research Projects of Institutions of Higher Learning of Henan Province Education Department (No. 21zx002).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212810608557
Title:Nanoscale vacuum diode based on thermionic emission for high temperature operation????(Open Access)
Authors:Shen, Zhihua (1); Li, Qiaoning (1); Wang, Xiao (2); Tian, Jinshou (3); Wu, Shengli (4)
Author affiliation:(1) School of Electronics and Information Engineering, Nantong Vocational University, Nantong; 226007, China; (2) School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an; 710049, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (4) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an; 710049, China
Corresponding author:Shen, Zhihua(shenzh@mail.ntvu.edu.cnemailwangxiao@sust.edu.cn)Wang, Xiao(wangxiao@sust.edu.cn)
Source title:Micromachines
Abbreviated source title:Micromachines
Volume:12
Issue:7
Issue date:July 2021
Publication year:2021
Article number:729
Language:English
E-ISSN:2072666X
Document type:Journal article (JA)
Publisher:MDPI AG
Abstract:

Vacuum diodes, based on field emission mechanisms, demonstrate a superior performance in high-temperature operations compared to solid-state devices. However, when considering low operating voltage and continuous miniaturization, the cathode is usually made into a tip structure and the gap between cathode and anode is reduced to a nanoscale. This greatly increases the difficulty of preparation and makes it difficult to ensure fabrication consistency. Here, a metalinsulator-semiconductor (MIS) structural nanoscale vacuum diode, based on thermionic emission, was numerically studied. The results indicate that this device can operate at a stable level in a wide range of temperatures, at around 600 degrees Kelvin above 260 K at 0.2 V voltage bias. Moreover, unlike the conventional vacuum diodes working in field emission regime where the emission current is extremely sensitive to the gap-width between the cathode and the anode, the emission current of the proposed diode shows a weak correlation to the gap-width. These features make this diode a promising alternative to vacuum electronics for large-scale production and harsh environmental applications.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Number of references:21
Main heading:Field emission displays
Controlled terms:Anodes - Electronics industry - Field emission - Field emission cathodes - High temperature operations - Nanotechnology - Semiconductor diodes - Thermionic emission - Vacuum technology
Uncontrolled terms:Cathode and anode - Environmental applications - Field emission mechanism - Large scale productions - Low operating voltage - Metal-insulator-semiconductors - Vacuum electronics - Weak correlation
Classification code:633 Vacuum Technology - 714.1 Electron Tubes - 714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology
Numerical data indexing:Temperature 2.60e+02K, Voltage 2.00e-01V
DOI:10.3390/mi12070729
Funding details: Number: 20KJD510001, Acronym: -, Sponsor: -;Number: 62004108,62004120, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;
Funding text:Funding: This research was funded by National Natural Science Foundation of China, grant number 62004108, 62004120. And this research was also funded by Natural Science Foundation for Universities of Jiangsu Province, China, grant number 20KJD510001.

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Open Access type(s): All Open Access, Gold, Green

Accession number:20213410810256
Title:Stray Light Suppression in Sweep Mirror Field-Widened Space-Borne Fourier Transform Imaging Spectrometer
Title of translation:侧摆扩视场型星载干涉光谱成像仪杂散光抑制研究
Authors:Zhang, Zhinan (1, 2); Li, Libo (1); Zou, Chunbo (1); Hao, Xiongbo (1); Sun, Jian (1, 2); Liu, Xuebin (1); Wang, Pengchong (1); Liu, Jie (1, 2)
Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xian's Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Li, Libo(lilibo@opt.ac.cn)
Source title:Guangxue Xuebao/Acta Optica Sinica
Abbreviated source title:Guangxue Xuebao
Volume:41
Issue:10
Issue date:May 25, 2021
Publication year:2021
Article number:1029001
Language:Chinese
ISSN:02532239
CODEN:GUXUDC
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

The field widening of a sweep mirror field-widened Fourier transform imaging spectrometer is achieved by adding a sweep mirror before its optical system. However, the addition of the sweep mirror causes the cross distribution of rays from different fields and different channels, which presents a difficulty in the suppression of stray light, and thus the traditional stray light suppression design is no longer valid. To solve this problem, a new design of stray light suppression is proposed. Based on the stray light suppression design, the point source transmittance (PST) stimulation and analysis of the visible and near-infrared optical system and the shortwave infrared optical system is presented for the sweep mirror at different field of view locations of 0°, 15°, and -15°. The analysis results show that as for all sweep mirror locations, the PST along the spatial direction and spectral direction at 0.5° off-field angle can be reduced to 10-3. Based on the observation mode, the signal source and stray light source of the on-orbit imaging spectrometer are analyzed. In addition, based on the PST stimulation results, the stray light irradiance at the focal plane is studied and the signal-to-stray ratio is calculated. It shows that the signal-to-stray ratio of the visible and near-infrared optical system is 0.1% and that of the shortwave infrared optical system is 0.6%. The results indicate that the proposed stray light suppression method is effective and can meet the requirement of the space-borne imaging spectrometer.
© 2021, Chinese Lasers Press. All right reserved.
Number of references:14
Main heading:Stray light
Controlled terms:Infrared devices - Light sources - Mirrors - Optical systems - Spectrometers
Uncontrolled terms:Fourier transform imaging spectrometers - Imaging spectrometers - Light irradiances - Short wave infrared - Spatial direction - Spectral directions - Stray light suppression - Visible and near infrared
Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems
Numerical data indexing:Percentage 1.00e-01%, Percentage 6.00e-01%
DOI:10.3788/AOS202141.1029001

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212010360071
Title:Performance Optimization and Experimental Research of Continuous Wave Coherent Wind Lidar
Title of translation:连续模式相干测风激光雷达性能优化分析及实验研究
Authors:Yang, Wuhao (1, 2); Zhang, Pu (1); Yang, Xinfeng (3); Chen, Qimin (1, 4); Zhao, Wei (1)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Songshan Lake Materials Laboratory, Dongguan; 523008, China; (4) Shaanxi Normal University, Xi'an; 710119, China
Corresponding author:Zhang, Pu(zhangpu@opt.ac.cn)
Source title:Guangzi Xuebao/Acta Photonica Sinica
Abbreviated source title:Guangzi Xuebao
Volume:50
Issue:4
Issue date:April 25, 2021
Publication year:2021
Article number:0401004
Language:Chinese
ISSN:10044213
CODEN:GUXUED
Document type:Journal article (JA)
Publisher:Chinese Optical Society
Abstract:

Based on the requirement of wind velocity measurement, an all-fiber doppler coherent wind lidar system is built with continuous wave laser source at band 1 550 nm. It is analyzed theoretically for the Carrier-to-noise ratio function of the continuous wave coherent lidar and the weighing function of the wind velocity at different focusing distance on the basis of the lidar equation. A vari-focusing optical antenna with the focusing distance range from 5 m to 200 m is designed and fabricated according to the requirement of wind detection. The optical beam expanding module adopts the Galilean refractive structure with the beam expanding ratio as 23 and the optical quality is close to the diffraction limit. The calibration test is executed by using a rotating motor disk. The rotation speed range of the disk is from -3 000 r/min to +3 000 r/min. The diameter of the disk is 26 cm. While the doppler frequency shift of the line of sight velocity is positive and negative, the correlation coefficients between the velocity measurement data of the lidar system and the theoretical calculation result are 0.998 and 0.993. At the same time the standard deviations of velocity are 0.151 m/s and 0.229 m/s, respectively. The wind lidar is then used to measure the atmospheric wind speed. It works correctly to apply the wind lidar to measure the atmospheric wind velocity.
© 2021, Science Press. All right reserved.
Number of references:17
Main heading:Optical radar
Controlled terms:Antennas - Continuous wave lasers - Diffraction - Focusing - Velocity - Velocity measurement - Wind
Uncontrolled terms:Carrier to noise ratio - Correlation coefficient - Diffraction limits - Doppler frequency shift - Experimental research - Performance optimizations - Theoretical calculations - Wind velocity measurement
Classification code:443.1 Atmospheric Properties - 716.2 Radar Systems and Equipment - 744.1 Lasers, General - 943.3 Special Purpose Instruments
Numerical data indexing:Size 1.55e-06m, Size 2.60e-01m, Size 5.00e+00m to 2.00e+02m, Velocity 1.51e-01m/s, Velocity 2.29e-01m/s
DOI:10.3788/gzxb20215004.0401004
Funding text:Western Young Scholars Foundation of the Chinese Academy of Sciences (No. Y929471233).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20213310777740
Title:Experimental demonstration of nonlinear scattering processes in a microbottle resonator based on a robust packaged platform
Authors:Wang, Mengyu (1); Yang, Yu (2); Lu, Zhizhou (3); Wang, Weiqiang (4); Zhang, Wenfu (5); Xie, Chengfeng (6); Zhong, Huikai (7); Wu, Lingfeng (8); Wu, Tao (9); Tan, Qinggui (10); Fu, Yanjun (11); Wang, Keyi (12)
Author affiliation:(1) Key Laboratory of Nondestructive Test of Ministry of Education, Nanchang Hangkong University, Nanchang, Jiangxi, China, (e-mail: mengyu@mail.ustc.edu.cn); (2) Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, 12652 Hefei, Anhui, China, (e-mail: yangyu09@mail.ustc.edu.cn); (3) State Key Laboratory of Transient Optics and Photonics, Xian Institute of Optics and Precision Mechanics, Xi'an Institute of Optics and Precision Mechanics, 53046 Xi'an, Shaanxi, China, (e-mail: luzhizhou2015@opt.cn); (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, Shaanxi, China, 710119 (e-mail: wwq@opt.ac.cn); (5) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, 53046 Xi'an, Shaanxi, China, (e-mail: wfuzhang@opt.ac.cn); (6) School of Testing and Optoelectronics Engineering, Nanchang Hangkong University, 139309 Nanchang, Jiangxi, China, (e-mail: xcf@nchu.edu.cn); (7) Key Laboratory of Nondestructive Test of Ministry of Education, Nanchang Hangkong University, Nanchang, Jiangxi, China, (e-mail: huikaiz@nchu.edu.cn); (8) Key Laboratory of Nondestructive Test of Ministry of Education, Nanchang Hangkong University, Nanchang, Jiangxi, China, (e-mail: 70813@nchu.edu.cn); (9) the Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, 139309 Nanchang, Jaingxi, China, 330063 (e-mail: wutccnu@nchu.edu.cn); (10) Key Laboratory of Science and Technology on Space Microwave Technology, China Academy of Space Technology, xi'an, Shanxi, China, (e-mail: uestctqg@163.com); (11) Key Laboratory of Nondestructive Test of Ministry of Education, Nanchang Hangkong University, Nanchang, Jiangxi, China, (e-mail: 23021@nchu.edu.cn); (12) Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, China, (e-mail: kywang@ustc.edu.cn)
Source title:Journal of Lightwave Technology
Abbreviated source title:J Lightwave Technol
Issue date:2021
Publication year:2021
Language:English
ISSN:07338724
E-ISSN:15582213
CODEN:JLTEDG
Document type:Article in Press
Publisher:Institute of Electrical and Electronics Engineers Inc.
Abstract:

Microbottle resonators (MBR) have attracted research interest for studying nonlinear optical interactions in last two decades, due to the ultra-tight optical confinement in spaces of three dimensions. In this paper, silica MBRs exhibiting rich resonant modes with ultra-high quality factor up to 3.7310^8 are demonstrated, based on which a portable and robust packaged platform with a tapered fiber coupling is established. Such a packaged platform effectively avoids external perturbations such as air flow and tiny mechanical vibrations, which supports our experimental demonstration of nonlinear scattering effects including four-wave mixing (FWM), simulated Raman scattering, and simulated Brillouin scattering. As a result, Raman-assisted FWM and Brillouin-assisted FWM are observed due to the strong field enhancement in the MBR. In a further investigation, a Kerr frequency comb with broad bandwidth of ~200 nm and a Raman-assisted comb with a bandwidth up to ~50 nm is achieved, correspondingly. Our works show the versatility of MBR for fundamental research and may open a new route to the development of practical applications in frequency conversion, spectroscopy and communications.
IEEE
Main heading:Four wave mixing
Controlled terms:Bandwidth - Brillouin scattering - Resonators - Silica - Vibrations (mechanical)
Uncontrolled terms:Experimental demonstrations - External perturbations - Fundamental research - Nonlinear optical interactions - Nonlinear scattering - Optical confinement - Simulated Brillouin scattering - Simulated raman scattering
Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 931.1 Mechanics
DOI:10.1109/JLT.2021.3092636

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20211510213134
Title:2.86 μm emission and fluorescence enhancement through controlled precipitation of ZnTe nanocrystals in DyF3 doped multicomponent tellurite oxyfluoride glass
Authors:Wan, Rui (1, 2); Wang, Pengfei (1, 2); Li, Shengwu (1, 2); Ma, Yuan (1, 2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China
Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)
Source title:Journal of Non-Crystalline Solids
Abbreviated source title:J Non Cryst Solids
Volume:564
Issue date:July 15, 2021
Publication year:2021
Article number:120842
Language:English
ISSN:00223093
CODEN:JNCSBJ
Document type:Journal article (JA)
Publisher:Elsevier B.V.
Abstract:

Tellurite oxyfluoride glasses with composition of 71TeO2-10ZnO-10BaF2-4K2O-3Nb2O5-2TiO2 doped with different concentrations of DyF3 (0.3, 0.4, 0.5, 0.7, 1 wt%) were prepared by melt-quenching method under dry O2 atmosphere. Under 808 nm laser pumping, infrared (IR) fluorescence emission with central wavelength of 2.86 μm was detected. Basing on the Judd-Ofelt (J-O) theory, the intensity parameters (Ωλ, λ=2, 4 and 6) and radiative property were calculated and characterized through the transmission and fluorescence spectra. The tellurite oxyfluoride glass had high thermal stability and large emission cross-section at 2.86 μm (7.82 × 10−21 cm2). DyF3 doped tellurite oxyfluoride glass ceramic were prepared via in-situ crystallization of ZnTe nanocrystals through heat treatment to ameliorate the surrounding environment of rare earth (RE) ions. The tellurite oxyfluoride glass ceramic prepared by heat treatment at 390°C had great enhancement in 2.86 μm fluorescence intensity (about 7 times), longer fluorescence lifetime (126 μs), indicating that the in-situ crystallization method may be helpful for exploring tellurite based high gain laser glass.
© 2021
Number of references:53
Main heading:Fluorescence
Controlled terms:Barium compounds - Dysprosium compounds - Erbium compounds - Fluorine compounds - Glass ceramics - II-VI semiconductors - Judd-Ofelt theory - Nanocrystals - Niobium oxide - Pumping (laser) - Rare earths - Tellurium compounds - Titanium dioxide - Zinc compounds
Uncontrolled terms:Controlled precipitation - Emission enhancement - Fluorescence enhancement - Glass-ceramics - In-situ crystallization - Infrared fluorescences - Judd- Ofelt theories - Oxyfluoride glass - Oxyfluoride glass-ceramics - Tellurite oxyfluoride glass
Classification code:712.1 Semiconducting Materials - 741.1 Light/Optics - 744.1 Lasers, General - 761 Nanotechnology - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 931.3 Atomic and Molecular Physics - 933.1 Crystalline Solids
Numerical data indexing:Pressure 2.02E+05Pa, Size 2.10E-01m, Size 2.86E-06m, Size 8.08E-07m, Temperature 2.00E+00K to 4.00E+00K, Temperature 6.63E+02K, Time 1.26E-04s
DOI:10.1016/j.jnoncrysol.2021.120842
Funding details: Number: 61775235, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2016A08, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017446, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2021GY-251, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;
Funding text:This work is financially supported by the National Natural Science Foundation of China (NSFC No. 61775235 ), West Young Scholars Program of the Chinese Academy of Sciences ( XAB2016A08 ), the Youth Innovation Promotion Association, CAS ( 2017446 ) and the Shaanxi Provincial Key Research and Development Program ( 2021GY-251 ).

 

Database:Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.

Accession number:20212110396436
Title:Simple reformulation of the coordinate transformation method for gratings with a vertical facet or overhanging profile
Authors:Ming, Xianshun (1, 2); Sun, Liqun (2)
Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy ofSciences (CAS), Xi’an; 710119, China; (2) State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing; 100084, China
Corresponding author:Sun, Liqun(sunlq@mail.tsinghua.edu.cn)
Source title:Applied Optics
Abbreviated source title:Appl. Opt.
Volume:60
Issue:15
Issue date:May 20, 2021
Publication year:2021
Pages:4305-4314
Language:English
ISSN:1559128X
E-ISSN:21553165
CODEN:APOPAI
Document type:Journal article (JA)
Publisher:The Optical Society
Abstract:

We reformulate the coordinate transformation method (C method) for gratings with a vertical facet or overhanging profile (overhanging gratings), in which no tenso