2022

• Record 109 of
  
  Title:Research on optimization of alignment algorithm for off-axis telescopes wavefront active correction
  
  Author(s):Lei, Yu(1,2); Ma, Caiwen(1,2); Li, Hua(1); Kang, Shifa(1); Fu, Xing(1); Cao, Mingqiang(1); Yin, Yamei(1)
  Source: Optical Engineering  Volume: 61  Issue: 11  DOI: 10.1117/1.OE.61.11.115105  Published: November 1, 2022  
  Abstract:In the field of the active wavefront correction for off-axis telescopes, the sensitivity matrix and damped least squares method are widely employed to calculate the misalignment. Improper selection of the damping coefficient will lead to bad wavefront correction results. Moreover, the calculated misalignment is referenced on the optical coordinate system, which cannot be directly applied as the control quantity. The article has two innovative points to solve these problems. First, an adaptive damping least squares method is proposed. The method considers the mirror surface error, uses Python + Zemax cosimulation to perform closed-loop reverse verification, and selects the optimal damping coefficient. Simulation is carried out for verification. Second, the article deduces the mathematical relationship between the calculated misalignment and the mechanism control quantity. Based on the above research, the wavefront active correction experiment has been completed. The optical component is actively adjusted with the wavefront quickly converging to RMS = 0. 055λ @ 632. 8 nm. The results verify the correctness of the proposed method. © 2022 Society of Photo-Optical Instrumentation Engineers (SPIE).
  Accession Number: 20230313396223
• Record 110 of
  
  Title:Fully connected aperture array design of the segmented planar imaging system
  
  Author(s):Liu, Gang(1,2); Wen, Desheng(1,2); Fan, Wenhui(1,2,3); Song, Zongxi(1,2); Sun, Zhonghan(1)
  Source: Optics Letters  Volume: 47  Issue: 18  DOI: 10.1364/OL.465133  Published: September 15, 2022  
  Abstract:Compared with the traditional imaging systems, segmented planar imaging technology has the advantages of low mess, small size, and low power in the same resolution situation. To obtain relatively complete frequency domain coverage, the lenslet array requires a large number of lenslets, and the photonic integrated circuit board requires a large number of optical devices, which limits the application and development of the segmented planar imaging technology. In this paper, we introduce a novel, to the best of our knowledge, design of the photonic integrated circuit to ensure that each lenslet in the lenslet array can form a baseline with any other lenslets. This breaks the barrier between segmented planar imaging technology and the traditional synthetic aperture, giving segmented planar imaging technology a sufficient number of frequency domain samples and a concise photonic integrated circuit structure. © 2022 Optica Publishing Group.
  Accession Number: 20224112865478
• Record 111 of
  
  Title:Research and development of the physical system for horizontal counter-propagating atom interferometric gyroscope
  
  Author(s):Wang, Xianhua(1); Jia, Sen(1); Wang, Yiding(1)
  Source: Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument  Volume: 43  Issue: 12  DOI: 10.19650/j.cnki.cjsi.J2210108  Published: December 2022  
  Abstract:Based on matter wave and Sagnac effect, the angular velocity and acceleration in horizontal direction of the carrier can be measured by the horizontal atom interferometric gyroscope. The physical system is the key subsystem of a gyroscope, which provides the circumstances of ultrahigh vacuum with special magnetic distributions and optical paths for control and detection of atom states by lasers. To realize of atom interferometry and satisfy the requirements of high-precision measurement, the principles of atom interferometric gyroscope operation are analyzed, and the functional requirements and basic mechanical components are clarified. Based on the theoretical analysis, the key specifications including vacuum degrees and magnetic distributions of each functional area are proposed. Therefore, a physical system of atom interferometric gyroscope is constructed, the measurement results reveal that the vacuum held steady at 10-8 Pa, and the diameter of cold atom cloud generating from this system is 6 mm, with the quantity of 8×109 and temperature of 12.8 μK, which satisfies the requirement of the subsequent experiments. © 2022 Science Press. All rights reserved.
  Accession Number: 20231613890654
• Record 112 of
  
  Title:Quantitative atmospheric phase jitter simulating research of optic field imaging
  
  Author(s):Cheng, Zhiyuan(1); Li, Zhiguo(1); Ji, Zhou(2); Yan, Peipei(1); Xia, Aili(3)
  Source: ACM International Conference Proceeding Series  Volume:   Issue:   DOI: 10.1145/3548608.3559198  Published: June 24, 2022  
  Abstract:The laser field imaging telescope emits laser coherent field to detect space targets. When laser passes through the atmospheric transmission path, the laser is inevitably affected by the phase jitter of atmosphere. Atmospheric phase jitter varies randomly and it is difficult to be quantitatively simulated. In order to quantitatively research the influence of atmospheric phase jitter on imaging quality, a quantitative simulation method of atmospheric phase jitter based on the change of beam frequency difference was proposed. A set of atmospheric turbulence phase jitter quantitative numerical simulation experimental platform was constructed. The effect of different phase jitter on the imaging quality of laser field imaging was quantitatively studied. The results show that the larger the atmospheric phase jitter is, the more degraded the image quality is. We suggest that the atmospheric phase jitter should be suppressed in the signal reconstruction. The quantitative simulation method of atmospheric phase jitter provides an effective technique for studying the image quality of light field imaging. © 2022 ACM.
  Accession Number: 20224413023815
• Record 113 of
  
  Title:Influence of exposure time on image reconstruction by lensless imaging technology
  
  Author(s):Yao, Xiaopeng(1,2); Liu, Muyuan(1,2); Su, Xiuqin(1,3); Zhu, Wenhua(1,2,3)
  Source: 2022 7th International Conference on Intelligent Computing and Signal Processing, ICSP 2022  Volume:   Issue:   DOI: 10.1109/ICSP54964.2022.9778316  Published: 2022  
  Abstract:The quality of the reconstructed image from lensless imaging is affected by the exposure time. This paper explores the influence of exposure time on imaging technology. Based on the lensless imaging system established by us, we compare and analyze the objective evaluation indexes of reconstructed images under different exposure times, which proves that our lensless imaging system is suitable for all-weather application fields. © 2022 IEEE.
  Accession Number: 20222412229938
• Record 114 of
  
  Title:Spatial weighted kernel spectral angle constraint method for hyperspectral change detection
  
  Author(s):Liu, Song(1,2); Song, Liyao(3); Li, Haiwei(1); Chen, Junyu(1,2); Zhang, Geng(1); Hu, Bingliang(1); Wang, Shuang(1); Li, Siyuan(1)
  Source: Journal of Applied Remote Sensing  Volume: 16  Issue: 1  DOI: 10.1117/1.JRS.16.016503  Published: January 1, 2022  
  Abstract:Change detection is an important research direction in the field of remote sensing technology. However, for hyperspectral images, the nonlinear relationship between the two temporal images will increase the difficulty of judging whether the pixel is changed or not. To solve this problem, a hyperspectral change detection method is proposed in which the transformation matrices are obtained by using the constraint formula based on the minimum spectral angle, which uses both spectral and spatial information. Further, a kernel function is used to handle the nonlinear points. There are three main steps in the proposed method: First, the two temporal hyperspectral images are transformed into new dimensional space by a nonlinear function; second, in the dimension of observation, all the observations are combined into a vector, and then the two transformation matrices are obtained by using the formula of spectral angle constraint; and third, each pixel is given weight with a spatial weight map, which combined the spectral information and spatial information. Study results on three data sets indicate that the proposed method performs better than most unsupervised methods. © 2022 Society of Photo-Optical Instrumentation Engineers (SPIE).
  Accession Number: 20221611975638
• Record 115 of
  
  Title:Symmetric thinned coprime array with reduced mutual coupling for mixed near-field and far-field sources localization
  
  Author(s):Wang, Yinsheng(1); Cui, WeiJia(1); Yang, Bingqing(2); Ba, Bin(1); Mei, Fengtong(1)
  Source: IET Radar, Sonar and Navigation  Volume: 16  Issue: 8  DOI: 10.1049/rsn2.12261  Published: August 2022  
  Abstract:As we all know, the non-uniform array is widely used in the mixed near-field (NF) and far-field sources localization. The nested array contains a uniform linear array, it is easy to be affected by mutual coupling, so we propose a symmetric thinned coprime array (STCA) to reduce the mutual coupling effect of mixed source localization. In this paper, the STCA configuration consists of two sparse uniform linear arrays, the first subarray is composed of 2N − 1 sensors, and the sensor element spacing is Md. The second subarray is composed of (Formula presented.) sensors, and the sensor element spacing are Nd and Md respectively. The two subarrays form the symmetric coprime array, which shares a reference sensor. Under the same number of physical array sensors, compared with the latest symmetric nested array, although STCA has lower consecutive lags, the array sensors have larger inter-sensor spacing and larger physical array aperture, which can significantly reduce the mutual coupling effect between physical sensors, and better estimation performance of direction-of-arrival (DOA) estimation can be achieved. Finally, simulation results show that STCA can achieve better performance than other symmetric nested arrays under the same array sensors and mutual coupling effects. © 2022 The Authors. IET Radar, Sonar & Navigation published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.
  Accession Number: 20221511941424
• Record 116 of
  
  Title:Path optimization for uniform removal pre-polishing of optical glass with industrial robots
  
  Author(s):Zhao, Liangxiao(1,2); Zhang, Jian(1,3); Gao, Limin(1)
  Source: Optical Engineering  Volume: 61  Issue: 4  DOI: 10.1117/1.OE.61.4.045104  Published: April 1, 2022  
  Abstract:In the field of precision optical manufacturing, the manufacturing method using industrial robots as the carrier has highlighted its advantages of being more economical and efficient than existing methods. The application of different end-effectors has expanded the scenarios and processing limits of optical polishing. However, concise and simplified polishing technologies remain challenging. To improve the versatility of industrial robots in different processes and reduce the number of polishing iterations, pre-polishing with uniform removal is introduced and optimized, providing an excellent basic surface for polishing and finishing. Combined with the performance of an industrial robot, we adopt a swing composite path, to which the motion parameters are adjusted and optimized to minimize the fluctuation of the overall overlap rate (within 5%). The optimal path is based on the uniform B-spline curve characterization, which improves the consistency of the dwelling time and reduces the complexity of pre-polishing, laying a theoretical foundation for efficient and high-quality optical manufacturing. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
  Accession Number: 20222012107755
• Record 117 of
  
  Title:Observation of high-order imaginary Poynting momentum optomechanics in structured light
  
  Author(s):Zhou, Yuan(1,2); Xu, Xiaohao(3); Zhang, Yanan(1,2); Li, Manman(1); Yan, Shaohui(1); Nieto-Vesperinas, Manuel(4); Li, Baojun(3); Qiu, Cheng-Wei(5); Yao, Baoli(1,2)
  Source: arXiv  Volume:   Issue:   DOI: 10.48550/arXiv.2206.03153  Published: June 7, 2022  
  Abstract:The imaginary Poynting momentum (IPM) of light has been captivated an unusual origin of optomechanical effects on dipolar magnetoelectric particles, but yet observed in experiments. Here, we report, for the very first time, a whole family of high-order IPM forces for not only magnetoelectric but also generic Mie particles, assisted with their excited higher multipoles within. Such optomechanical phenomena derive from a nonlinear contribution of the IPM to the optical force, and can be remarkable even when the incident IPM is small. We observe the high-order optomechanics in a structured light beam with vortex-like IPM streamlines, which allows the low-order dipolar contribution to be suppressed. Our results provide the first unambiguous evidence of the ponderomotive nature of the IPM, expand the classification of optical forces and open new possibilities for optical forces and micromanipulations. © 2022, CC BY.
  Accession Number: 20220157093
• Record 118 of
  
  Title:Study on multi-beam laser coherent imaging system
  
  Author(s):Liu, Hui(1,2,3); Gao, Xin(4); Luo, Xiu-Juan(1,3); Zhang, Yu(1,2,3); Chen, Ming-Lai(1,2,3); Yue, Ze-Lin(2,3)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12307  Issue:   DOI: 10.1117/12.2644089  Published: 2022  
  Abstract:Coherent imaging with multi-beam laser is considered as a key technique in ground based imaging. In the paper, the composition of multi-beam laser coherent imaging system is demonstrated in detail, the constraints between subsystem parameters are analyzed, and the array layout of multi-beam laser imaging transmitter is proposed. In the system, the laser aiming accuracy has an important impact on the imaging. The theoretical simulation indicates that the aiming error of the emitter array should be controlled within 5%. Finally, Design equivalent aperture as φ1.5m experimental system and Imaging target successfully, verifying the correctness and feasibility of the system, and promoting the implementation of multi-beams coherent imaging technology. © 2022 SPIE.
  Accession Number: 20223712717629
• Record 119 of
  
  Title:Shack-Hartmann wavefront reconstruction speed up with embedded GPU
  
  Author(s):Fan, Yao(1,2); Duan, Yaxuan(1,2); Kou, Jingwei(1,2); Zhang, Weigang(1,2); Liu, Qing(1,2); Da, Zhengshang(1,2)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12478  Issue:   DOI: 10.1117/12.2648160  Published: 2022  
  Abstract:Shack-Hartmann sensor is widely used in adaptive optics systems, and laser beam quality measurements. The traditional method separates measures and calculations, and the wavefront reconstruction algorithm is slow to implement on the host computer. In this paper, the embedded GPU is introduced to Shack-Hartmann sensors' wavefront phase reconstruction. A parallel calculation method is proposed to speed up the wavefront phase reconstruction process. The experiment result shows the algorithm speed improves 50×with the image size of 2592×2048 pixels. © 2022 SPIE.
  Accession Number: 20230413446509
• Record 120 of
  
  Title:Research on Micro-vibration Suppression Algorithm Based on RBF Neural Network
  
  Author(s):Wang, Yuanyuan(1,2); Wang, Chen(1); Han, Junfeng(1); Tian, Hua(1,2)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12343  Issue:   DOI: 10.1117/12.2648243  Published: 2022  
  Abstract:In the inter-satellite laser communication, a reliable communication link requires the boresight tracking accuracy between the optical transceivers to be sub-micro radians, and the control error caused by the vibration of the satellite platform is the most important factor affecting the optical communication link. The vibration and the effect of the adopted suppression scheme largely determine the tracking accuracy of the PAT system. Therefore, the impact of reducing the vibration on the optical communication link is a prerequisite for establishing stable satellite optical communication links. This paper uses the active compensation of the satellite platform vibration as the research direction, and proposes a composite control micro-vibration suppression algorithm based on the RBF neural network. On the basis of traditional PID control, adaptive RBF neural network feedforward control and PID control combination constitute composite control, design and establishing satellite platform vibration suppression system, simulation verifies the performance of traditional PID control and RBF composite control algorithm, result indicates that the RBF composite control algorithm has increased by 80% compared to traditional PID control. © 2022 SPIE.
  Accession Number: 20224613118982