2022

• Record 181 of
  
  Title:Fusion of Infrared and Visible Sensor Images Based on Anisotropic Diffusion and Fast Guided Filter
  
  Author(s):Nan, Jingwen(1,2); Song, Zongxi(1); Lei, Hao(1); Li, Wei(1)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12342  Issue:   DOI: 10.1117/12.2644537  Published: 2022  
  Abstract:Infrared images and visible images can obtain different image information in the same scene, especially in low-light scenes, infrared images can obtain image information that cannot be obtained by visible images. In order to obtain more useful information in the environment such as glimmer, infrared and visible images can be fused. In this paper, an image fusion method based on anisotropic diffusion and fast guided filter is proposed. Firstly, the source images are decomposed into base layers and detail layers by anisotropic dispersion. Secondly, the visible images and the infrared images are passed through the side window Gaussian filter to obtain the saliency map, and then the saliency map is passed through fast guided filter to obtain the fusion weight. Thirdly, the fused base layers and the fused detail layers are reconstructed to obtain the final fusion image. The application of the side window Gaussian filter helps to reduce the artifact information of the fused image. The results of the proposed algorithm are compared with similar algorithms. The fusion results reveal that the proposed method are outstanding in subjective evaluation and objective evaluation, and are better than other algorithms in standard deviation(STD) and entropy(EN), and other quality metrics are close to the optimal comparison algorithm. © 2022 SPIE.
  Accession Number: 20224613131302
• Record 182 of
  
  Title:Research on selection of high intensity laser beam expanding system
  
  Author(s):Gao, Na(1,2); Zhang, XiangHui(1); Liu, Jie(1); Shen, ZeYi(1); Xin, Wei(1); Wang, Hu(1,2)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12169  Issue:   DOI: 10.1117/12.2625044  Published: 2022  
  Abstract:Since the advent of laser in communication, remote sensing and space observation and so on many fields obtained the rapid development,and the laser emission system is the core composition of various laser applications. This paper briefly introduces the principle of the laser beam expander system. Laser beam expander system through the study of the expanded beam of laser light source transformation, compress the divergent angle, the light source can reduce the energy loss in long distance transmission. This paper compares the optical structure of various common laser beam expanding systems, analyzes the advantages and disadvantages of refraction and reflection, coaxial and off-axis, designs an off-axis three-reaction system, and briefly describes the selection of lens in high-power laser beam expanding system. © 2022 SPIE
  Accession Number: 20221611967721
• Record 183 of
  
  Title:Effect of adding CsI on properties of Ge20Sb10Se65Te5 glass
  
  Author(s):Xu, Junfeng(1); Zhang, Baodong(1); Cao, Jitao(1); Fan, Wenwen(1); Yao, Zhirui(1); Li, Xuyang(2)
  Source: Infrared Physics and Technology  Volume: 126  Issue:   DOI: 10.1016/j.infrared.2022.104370  Published: November 2022  
  Abstract:The mechanical and thermal properties of (100-x)Ge20Sb10Se65Te5-xCsI(x = 0, 1, 2, 3, 4) glass was studied. It is found that with increase of CsI, the short-wave cut-off wavelength of infrared transmittance moves from 1000 nm to 900 nm, and the long-wave cut-off wavelength reaches 20 μm. The glass transition temperature decreases from 531 K to 521 K. The crystallization peak temperature Tp decreases from 709 K to 670 K. The Vicker′s hardness decreases from 142HV to 134HV. The fracture toughness increases from o.48 to 0.57. The specific heat capacities were measured by the isothermal step method and it shows that the specific heat for the sample with CsI is larger than that without CsI. For 96Ge20Sb10Se65Te5-4CsI glass, the transmittance changes from 70 % to 53 % if the treatment temperature is between 280 °C and 310 °C. When it is kept at 310 °C for 40 h, the Vicker′s hardness and fracture toughness of the glass can reach 160.56 kgf⋅mm−2 and 0.82 kgf⋅mm−1/2, respectively. © 2022 Elsevier B.V.
  Accession Number: 20224012830211
• Record 184 of
  
  Title:Modeling and Analysis of Vertical Angle Fine-tuning Mechanism Based on Bridge-type Mechanism
  
  Author(s):Jiang, Bo(1); Zhang, Zijie(1,2); Zhou, Shun(2); Chu, Yuanbo(2); Guo, Yifan(2)
  Source: Journal of Physics: Conference Series  Volume: 2437  Issue: 1  DOI: 10.1088/1742-6596/2437/1/012083  Published: 2022  
  Abstract:To solve the problem of Angle fine-tuning in the vertical direction of optical devices, we propose an Angle fine-tuning mechanism based on Bridge-type Mechanism. In this paper, we use the method of compliance matrix to establish the statics model of the mechanism and calculate the influence of each parameter on the magnification of the model, then verify it by finite element simulation. Meanwhile, we deduce the calculation formula of compensation value by simulation value and theoretical value to establish Theoretical equations of motion for this mechanism. The results indicate that the simulation results agree well with the theoretical calculation results, after introducing the compensation value, the error caused by the amplification loss of the mechanism can be compensated well to ensure the accuracy of the derived formula. © Published under licence by IOP Publishing Ltd.
  Accession Number: 20230713597352
• Record 185 of
  
  Title:Research on Intelligent Health Management Technology of Opto-electronic Equipment
  
  Author(s):Zhang, Chuming(1,2); Wei, Guojun(2); Xie, Meilin(3); Liu, Peng(3); Cao, Yu(3); Lian, Xuezheng(3); Huang, Wei(3); Liu, Kai(3)
  Source: IEEE 6th Information Technology and Mechatronics Engineering Conference, ITOEC 2022  Volume:   Issue:   DOI: 10.1109/ITOEC53115.2022.9734543  Published: 2022  
  Abstract:With the development of China's weapon equipments and the continuous progress of information technology, the demand for the mobility, reliability, unmanned and flexible networking ability of opto-electronic measurement equipment is increasing. Breakthrough in the intelligent health management technology of opto-electronic equipment has become a major requirement for unmanned intelligent shooting range construction. Focusing on the opto-electronic measuring equipment in the shooting range, this paper detailed analyzes the development status of health management technology at home and abroad. Then it introduces the health diagnosis and decision-making strategy of opto-electronic equipment. According to a certain type of opto-electronic equipment, three health state early warning models are established and compared: health state early warning model based on statistical analysis, health state early warning model based on machine learning and health state early warning model based on neural network, subsystem simulation is given. Finally, the development direction of intelligent health management technology of opto-electronic equipment is predicted, the next work to be carried out is pointed out. © 2022 IEEE.
  Accession Number: 20221511946653
• Record 186 of
  
  Title:Research on the influence of forward scattering on the resolution of underwater imaging
  
  Author(s):DIng, Zhe(1,2)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12166  Issue:   DOI: 10.1117/12.2617759  Published: 2022  
  Abstract:When light is transmitted in an underwater environment, the scattering phenomenon caused by water molecules and suspended particles in the water will reduce the resolution of underwater imaging. Therefore, studying the scattering law of light traveling underwater can predict the degradation degree of underwater imaging resolution, thereby providing prior knowledge for underwater image processing. In order to study the effect of forward scattering on the resolution of underwater imaging, this paper use a modulation transfer function (MTF) model of the changing law of underwater imaging resolution, and then used Monte Carlo for simulation verification. The theoretical value and the simulation value are in good agreement, so this paper provides an effective solution for studying the influence of underwater forward scattering on the resolution of underwater imaging. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
  Accession Number: 20220911734972
• Record 187 of
  
  Title:Atmospheric Correction for Polarimetric Images Based on Spectral Segregation
  
  Author(s):Xia, Pu(1); Chen, Xiaolai(1); Tang, Zhaohuan(2)
  Source: ACM International Conference Proceeding Series  Volume:   Issue:   DOI: 10.1145/3529466.3529479  Published: March 4, 2022  
  Abstract:In hazy weather, light's penetration power is wavelength related, the longer wavelength, the less attenuation. Although traditional polarimetric image-dehazing algorithms have demonstrated their ability in enhancing grayscale images, but their ignorance of the spectral difference will lead to serious color distortion when utilizing these algorithms for color images. To conquer that problem, we propose a new method base on spectral segregation. 15 spectral bands are selected and dehazed with the polarimetric dehazing algorithm separately to obtain the best dehazing effects. The blue, green and red channels of the dehazed image, which are acquired through image fusion of the spectral bands, are adjusted with different coefficients to correct the color distortion. 10 infrared bands are added to the short-wavelength channels to enhance the details of the objects especially the trees. Experiment and data analysis demonstrate the effectiveness of our method in increasing visibility and preserving color information. The amount of color distortion can be reduced by 89.6% compared with the polarimetric image-dehazing algorithm without spectral segregation. © 2022 ACM.
  Accession Number: 20222412234689
• Record 188 of
  
  Title:CSTGAN: Cycle Swin Transformer GAN for Unpaired Infrared Image Colorization
  
  Author(s):Zhao, Mingfan(1,2); Feng, Guirong(3); Tan, Jiahai(4,5); Zhang, Ning(1); Lu, Xiaoqiang(1)
  Source: ACM International Conference Proceeding Series  Volume:   Issue:   DOI: 10.1145/3562007.3562053  Published: August 26, 2022  
  Abstract:Infrared images can be captured in harsh conditions such as low light and foggy weather, which provides an effective solution for image capture throughout the day. However, the low contrast and blurred object boundaries of infrared images hinder human interpretation and the application of computer vision algorithms. Colorizing infrared images is a significant and effective method to promote infrared image understanding. Image-to-image translation methods based on generative adversarial networks are currently the main methods for colorizing infrared images. The generative adversarial network designed by Transformer overcomes the disadvantage of weak global information capture ability caused by the convolutional generative adversarial network product focusing on local features. This paper proposed a new method called Cycle Swin Transformer Generative Adversarial Networks (CSTGAN) based on Cycle-Consistent Generative Adversarial Networks. The proposed method redesigns the generator with Swin Transformer and convolution layers, and modified the discriminator and loss function. The proposed method combines the advantages of convolution and Transformer to obtain accurate mapping between infrared image domain and visible light image domain, which reduces the artifacts and distortions caused by the existing infrared image colorization methods. In addition, we collected and produced a near-infrared image colorization dataset named NIR2RGB. Extensive experimental results show that the proposed method outperforms the previous methods on the FID and KID metrics on the public datasets RGB-NIR Scene and MFNet as well as produced NIR2RGB. © 2022 ACM.
  Accession Number: 20224312992538
• Record 189 of
  
  Title:Numerical Simulation on Magnetic Field Tolerance of MCP-PMTs
  
  Author(s):Li, Lili(1); Tian, Jinshou(1); Chen, Ping(1); Guo, Lehui(1); Wang, Xing(1); Liu, Hulin(1); Xue, Yanhua(1); Xin, Liwei(1); Gao, Guilong(1); He, Kai(1); Gou, Yongsheng(1); Zhang, Mingrui(1); Li, Shaohui(1); Sai, Xiaofeng(1); Liu, Baiyu(1); Xu, Xiangyan(1); Qu, Youshan(1); Zhao, Wei(1)
  Source: IEEE Transactions on Nuclear Science  Volume: 69  Issue: 4  DOI: 10.1109/TNS.2022.3150890  Published: April 1, 2022  
  Abstract:Microchannel plate photomultiplier tubes (MCP-PMTs) with high temporal resolution and low dark count rates will be used as single-photon detectors for the Super Tau-Charm Facility (STCF) proposed in China. Similar to other RICH or DIRC detectors, MCP-PMTs in the STCF need to operate properly in an axial magnetic field of about 1.5 T. We study the magnetic field tolerance of MCP-PMTs with the simulation methods based on the Furman model as a secondary electron emission model and the particle-in-cell method for tracking electrons. The effects of MCP structural parameters (aperture D , length-to-diameter ratio L/D , bias angle theta , and applied voltage U ) on the magnetic field tolerance are simulated. The results show that the smaller the D and the smaller the L/D of the MCP, the better its magnetic field tolerance. By increasing the MCP bias angle, its magnetic field tolerance increases first and then weakens. The applied voltage does not affect its magnetic field tolerance. Changing the angle between the magnetic field and the normal direction to the microchannel plate (MCP), the gain decays fastest when the magnetic field direction is parallel to the axial direction of the MCP channels; at a magnetic field direction of 60°, the MCP gain decays the slowest. For MCP-PMTs, the change in the magnetic field direction causes the alteration of the motion direction of the electron cloud in the gaps (cathode-MCP1, MCP1-MCP2, and MCP2-anode), which is the principal reason for the difference in its gain in different magnetic field directions with the same magnetic field strength. The magnetic field tolerance of different assembly methods of two MCPs (i.e., two, three, or four electrodes for applying high voltage) is simulated. The results show that two MCPs' multiplication structure with the four-electrode assembly method is an appropriate choice. © 1963-2012 IEEE.
  Accession Number: 20220811679431
• Record 190 of
  
  Title:High-power and high-efficiency 4.3 μm ZGP-OPO
  
  Author(s):Wang, Feifei(1); Li, Jiatong(1); Sun, Xiaohui(1); Yan, Bingzheng(1); Nie, Hongkun(1); Li, Xun(4); Yang, Kejian(1,2); Zhang, Baitao(1,2); He, Jingliang(1,2,3)
  Source: Chinese Optics Letters  Volume: 20  Issue: 1  DOI: 10.3788/COL202220.011403  Published: January 10, 2022  
  Abstract:In this paper, a high-power and high-efficiency 4.3 μm mid-infrared (MIR) optical parametric oscillator (OPO) based on ZnGeP2 (ZGP) crystal is demonstrated. An acousto-optically Q-switched Ho: Y3Al5O12 laser operating at 2.1 μm with amaximum average output power of 35Wand pulse width of 38 ns at a repetition rate of 15 kHz is established and employed as the pump source. A doubly resonant OPO is designed and realized with the total MIR output power of 13.27 W, including the signal and idler output power of 2.65 W at 4.07 μm and 10.62 W at 4.3 μm. The corresponding total optical-to-optical and slope efficiencies are 37.9% and 67.1%, respectively. The shortest pulse width, beam quality factor, and output power instability are measured to be 36 ns, M2x = 1.8, M2y = 2.0, and RMS © 2022 Chinese Optics Letters.
  Accession Number: 20214010982963
• Record 191 of
  
  Title:Direct Writing of Channel Optical Waveguides in Er3+-Doped Aluminosilicate Glass by Low Repetition Rate Femtosecond Laser
  
  Author(s):Bai, Jing(1,3); Long, Xue-Wen(2); Wang, Wei-Qiang(4); Xie, Peng(5); Zhao, Wei(4)
  Source: ACS Applied Electronic Materials  Volume: 4  Issue: 6  DOI: 10.1021/acsaelm.2c00520  Published: June 28, 2022  
  Abstract:The symmetrical optical waveguide structures are fabricated in Er3+-doped aluminosilicate glass using 800 nm femtosecond laser writing in kHz repetition frequency regime. The impact of writing parameters on the waveguide preparation with a 10× microscope objective in the longitudinal writing scheme was studied in detail. The experimental results show that, under a fixed pulse energy value of 20 μJ, the waveguides can be realized with the scan speed from 20 to 160 μm/s, and with a fixed scan speed value of 160 μm/s, the waveguide can be prepared under an inscription energy range of 5-30 μJ, indicating that the waveguide can be realized in a wide range of writing parameters. The near-field mode intensity image shows that the waveguide region possesses excellent light guiding properties. Based on the refractive index profile reconstruction method, the maximum refractive index increase in the waveguide region is estimated to be about 5.5 × 10-4. The lowest propagation loss of the waveguide was measured to be about 1.51 dB/cm by the waveguide side scattering method. The microfluorescence spectra show that the gain characteristics of the waveguide region are well maintained after laser processing. This work shows that the fabrication of embedded optical waveguides using ultrashort pulse laser in Er3+-doped aluminosilicate glass has strong feasibility and great potential to create active gain devices in the field of integrated photonics and all-optical communication. © 2022 American Chemical Society.
  Accession Number: 20222712324891
• Record 192 of
  
  Title:Super-resolution multicolor fluorescence microscopy enabled by an apochromatic super-oscillatory lens with extended depth-of-focus
  
  Author(s):Li, Wenli(1,2,3); He, Pei(1,2,3); Fan, Yulong(4); Du, Yangtao(5); Gao, Bo(6); Chu, Zhiqin(7); An, Chengxu(1,2,3); Lei, Dangyuan(4); Yuan, Weizheng(1,2,3); Yu, Yiting(1,2,3)
  Source: arXiv  Volume:   Issue:   DOI: 10.48550/arXiv.2206.02335  Published: June 5, 2022  
  Abstract:Multicolor super-resolution imaging remains an intractable challenge for both far-field and near-field based super-resolution techniques. Planar super-oscillatory lens (SOL), a far-field subwavelength-focusing diffractive lens device, holds great potential for achieving sub-diffraction-limit imaging at multiple wavelengths. However, conventional SOL devices suffer from a numerical aperture (NA) related intrinsic tradeoff among the depth of focus (DoF), chromatic dispersion and focus spot size, being an essential characteristics of common diffractive optical elements. Typically, the limited DoF and significant chromatism associated with high NA can lead to unfavorable degradation of image quality although increasing NA imporves the resolution. Here, we apply a multi-objective genetic algorithm (GA) optimization approach to design an apochromatic binary-phase SOL that generates axially jointed multifoci concurrently having prolonged DoF, customized working distance (WD) and suppressed side-lobes yet minimized main-lobe size, optimizing the aforementioned NA-dependent tradeoff. Experimental implementation of this GA-optimized SOL demonstrates simultaneous focusing of blue, green and red light beams into an optical needle of ∼0.5λ in diameter and >10λ in length (DoF) at 428 μm WD, resulting in an ultimate resolution better than λ/3 in the lateral dimension. By integrating this apochromatic SOL device with a commercial fluorescence microscope, we employ the optical needle to perform, for the first time, three-dimensional super-resolution multicolor fluorescence imaging of the "unseen" fine structure of neurons at one go. The present study provides not only a practical route to far-field multicolor super-resolution imaging but also a viable approach for constructing imaging systems avoiding complex sample positioning and unfavorable photobleaching. Copyright © 2022, The Authors. All rights reserved.
  Accession Number: 20220153951