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5th International Conference on Computer Vision, Image and Deep Learning, CVIDL 2024

作者： Lin, Dayong Zhao, Chunhui Yan, Sichang Wang, Anran Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab Beijing China

ISBN: (纸本)9798350373820

Research related to current spatial targets commonly faces difficulties in obtaining real spatial data and high costs. A simulation platform for three-dimensional reconstruction of spatial targets based on Blender and Blensor was built to address this issue. A multi-angle acquisition process was designed to control the camera and LiDAR to surround the target with material information at set distances and angles for data collection. Additionally, light sources and a black background were added to simulate sunlight and the space environment. Visualized experimental results demonstrate high quality images and point clouds generated by the platform simulation. Quantitative experimental results further indicate that rendered images accurately depict the specular reflection characteristics present on the surface of spatial targets, showing it an efficient simulation of actual data collection. © 2024 IEEE.

关键词： Simulation platform

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Electrically tunable liquid-crystal Fabry-Pérot filter with high-birefringence nematic mixture for spectral imaging 12

Electrically tunable liquid-crystal Fabry-Pérot filter with...

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SPIE 12th International Symposium on Multispectral Image Processing and Pattern Recognition, MIPPR 2023

作者： Chen, Mingce Wang, Li Deng, Loulou Wang, Zihan Tu, Zhijun Li, Lin Xiong, Yan Zhao, Yu Xu, Qing Space Optoelectronic Measurement and Perception Lab Beijing Institute of Control Engineering Beijing100190 China

ISBN: (数字)9781510674929

ISBN: (纸本)9781510674912

Spectral imaging is an imaging technique that introduces spectral filters in the imaging link to simultaneously obtain target spectral and spatial information. Among the spectral filters, liquid-crystal (LC) filters exhibit technical advantages of fast response speed, low power consumption, and large aperture. As a highly efficient electrically tunable microcavity interference filter structure, the miniaturized liquid-crystal Fabry-Pérot (LC-FP) is generally composed of a LC layer sandwiched by two highly reflective mirrors. By adjusting the applied voltage signals, the high spectral resolution spectrum selection and adjustment of transmitted beam is implemented. Generally, the birefringence difference of the LC material used determines the phase modulation capability, which in turn affects the device performance. In this paper, an electrically tunable LC-FP filter (ET LC-FP) with high-birefringence nematic LC mixture is proposed. The deviced ET LC-FP is constructed using a kind of high-birefringence nematic LC mixture (HB-45800) for achieving the typical electrically selecting and adjusting and jumping of spectral lightbeam outfrom the ET LC-FP filter. The electro-optical parameters of HB-45800 are: "n = 0.385 at 589.3nm, the clear point is 95.1 ., . The transmission spectral characteristics (1.5∼15μm) of the ET LC-FP device were analyzed using a Fourier transform infrared spectrometer. Experiments demonstrate that an electrically tunable spectral resolution of better than 5nm is reached in the infrared domain of 1.5∼3μm. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Crystal structure

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Accuracy Analysis and Verification Method on Vision Position-pose measurement System 8

Accuracy Analysis and Verification Method on Vision Position...

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8th optoelectronics Global Conference, OGC 2023

作者： Bao, Jie Zhang, Chenglong Wei, Xinpeng Liu, Xingtan Zhao, Chunhui Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab Beijing China

ISBN: (纸本)9798350325324

In order to realize position-pose measurement system of monocular camera, a measurement accuracy test system was established. First, we introduce the system principle, theoretical accuracy analysis, computational experiments and computational results. In order to solve the problem of obtaining the true value of high precision pose measurement and the poor accuracy evaluation results caused by accuracy of the simulated motion platform, we proposed single laser tracker with higher accuracy as the method to verify the system accuracy. By establishing the relevant coordinate system and coordinate system conversion, the absolute accuracy of the camera position-pose measurement can be accurately obtained. The result of the 16m measurement accuracy verification experiment shows that, the position measurement accuracy x and y can reach the sub millimeter level. Due to the weak distance perception of monocular camera, the orientation error of z-axis is large, on the order of tens of millimeters. The minimum accuracy of the angle measurement result is 0.2°. Using a single laser tracker for relative measurement to evaluate the accuracy of the measurement system can effectively evaluate the measurement accuracy of the high-precision relative position and attitude measurement system under the limited laboratory conditions. © 2023 IEEE.

关键词： Cameras

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Design and in-orbit application of multi-head star sensor 2

Design and in-orbit application of multi-head star sensor

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2nd International Conference on Image Processing and Media Computing, ICIPMC 2023

作者： Huiyan, Cheng Ran, Zheng Jie, Sui Tengfei, Zhang Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab Beijing China

ISBN: (纸本)9798350326611

Star sensor is a widely used astrometric sensor, which is one of the important attitude sensors in spacecraft control systems. The multi-head star senor is the first sub-arc-second star sensor in-orbit. The key design and distinct characteristic are proposed, the consistency between orbit result and ground test is analyzed based on orbit and ground data. The result in orbit show that single head precision is higher than 1'' (30), and the fusion accuracy based on multi-head is better than 0.6 ''(3σ) the optical-axis angle error is lower than 2'', the SEA(sun excluded angle) is better than 26°. The star sensor can be used to military remote sensing satellite, astro observation with high precision and space science platform. © 2023 IEEE.

关键词： Orbits

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Review of space Dim Target Detection Methods 2

Review of Space Dim Target Detection Methods

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2nd International Conference on Image Processing and Media Computing, ICIPMC 2023

作者： Deyang, Zhang Ran, Zheng Huiyan, Cheng Xiaodi, Meng Lin, Li Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab Beijing China

ISBN: (纸本)9798350326611

At present, space dim target detection is easy to be disturbed by background noise and stars, difficult detection and long capture period. How to realize accurate detection of space dim target in low SNR condition, improve target sensitivity and obtain high-precision target position information, and meet the qualification of high detection rate and low false alarm rate is the key problem of space dim target detection technology. This paper introduces the current situation of image preprocessing, single-frame and multi-frame detection methods of space target, analyzes and evaluates its advantages and disadvantages, summarizes the development direction and trend of detection technology, and provides reference and suggestions for the research of space dim target detection technology. © 2023 IEEE.

关键词： Errors

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Gap Phase-Shifted Fiber Bragg Grating and Its Application 22

Gap Phase-Shifted Fiber Bragg Grating and Its Application

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Yang, Yuanhong Du, Liangya Lu, Lin Xiong, Yan Liu, Siyuan Fu, Weichun Zhao, Qin Yuan, Li Wu, Yanpeng School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab Beijing100190 China

ISBN: (纸本)9798350367652

A gap phase-shifted fiber Bragg grating (g-FBG) formed by cutting off a conventional FBG and re-coupling is proposed and demonstrated. Furthermore, a reflection g-FBG is put forward and investigated. The g- FBG can be implemented easily and used in optical spectrum filtering, tuning, and multiparameter sensing with better sensitivity and resolution. © 2024 IEEE.

关键词： Fiber Bragg gratings

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Research on High Dynamic Strain measurement Methods for Deployable Sunshades of Star Sensors

Research on High Dynamic Strain Measurement Methods for Depl...

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2024 Conference on Spectral Technology and Applications, CSTA 2024

作者： Yan, Xiong Siyuan, Liu Weichun, Fu Yanpeng, Wu Xiaoyan, Wang Yuming, Li Hao, Zhou Yuhang, Li Jin, Nan Space Optoelectronic Measurement and Perception Lab Beijing Institute of Control Engineering Beijing100190 China Beihang University Beijing100083 China

ISBN: (纸本)9781510683082

In the application of star sensors, there is a requirement to further expand the size of the sunshade to improve stray light suppression. However, traditional rigid sunshades are limited by the overall size and size constraints of the fairing, making it impossible to meet the demand. Therefore, deployable sunshades have emerged, which have advantages such as smaller compressed size, larger deployed size, strong ability to suppress stray light, and flexibility. This study focuses on the stress-strain characteristics of a key component of deployable sunshades for star sensors - leaf springs, and proposes a method for high-speed camera measurement of dynamic strain during the sunshade deployment process. First, through a literature review and investigation of relevant application cases, a design scheme using beryllium bronze leaf springs as the driving force for the sunshade was determined. Next, the plasticity parameters of beryllium bronze were obtained through tensile experiments to provide data support for subsequent simulation modeling. Based on experimental data and material parameters, the stress-strain behavior during compression and deployment of the leaf springs was simulated, and their fatigue life was analyzed. The accuracy of the model was verified through experiments, further exploring the relationship between stress-strain and fatigue life of the leaf springs. In conclusion, this study thoroughly investigates the stress-strain characteristics of leaf springs in deployable sunshades for star sensors, evaluates the impact of shocks on leaf springs through the proposed high dynamic strain measurement method, and the results indicate a reasonable design, sufficient margin, and low fatigue probability. This provides theoretical and experimental basis for the design and optimization of deployable sunshades for star sensors. © 2024 SPIE.

关键词： Strain measurement

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Spatial separation of azimuthally and radially polarized beams via patterned liquid-crystal alignment induced by sparse polymer ribbons 14

Spatial separation of azimuthally and radially polarized bea...

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14th International Conference on Information Optics and Photonics, CIOP 2023

作者： Chen, Mingce Zhang, Hengkang Yan, Sichang Wang, Li Deng, Loulou Li, Lin Wang, Zihan Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing100190 China

ISBN: (纸本)9781510671744

With the principle of electrically controlled birefringence (ECB), we propose a new method to spatially separate the azimuthally and radially polarized beams. The method is premised on a regularized arrangement of liquid-crystal (LC) induced by sparse polymer *** ECB effect was achieved by a hole-patterned LC device with an initial radial alignment, which is induced by polymer ribbons pre-fabricated on the substrate. The polymer ribbons were formed on the substrate via the ultraviolet (UV) mask exposure method, which has the advantages of low cost, simple fabrication process and can be used for mass production. When the voltage signals are applied to the fabricated LC device, a gradient refractive index distribution will form inside the device. Restricted by the inherent polarization-sensitive properties of the nematic phase, it corresponds to the extraordinary optical component, which is exactly the radially polarized beam. According to the above principle, the extraordinary and ordinary polarized components can be separated. Experiments demonstrated that the spatial separation was effectively achieved by the proposed LC device. The proposed method has provided an approach for the light field manipulation based on patterned liquid crystal alignment. © 2023 SPIE.

关键词： Liquid crystal displays

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Microwave photonic signal processing based on parameter-to-time mapping 14

Microwave photonic signal processing based on parameter-to-t...

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Semiconductor Lasers and Applications XIV 2024

作者： Wang, Lu Hao, Tengfei Li, Lin Guo, Shaogang Wang, Li Li, Wei Space Optoelectronic Measurement and Perception Lab Beijing Institute of Control Engineering Beijing100190 China Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

ISBN: (数字)9781510681958

ISBN: (纸本)9781510681941

Microwave photonic signal processing such as microwave frequency measurement and temperature sensing has been widely studied due to its advantages such as large instantaneous bandwidth, high resolution, flexible reconfigurability as well as immunity to electromagnetic interference. In this paper, we review our recent works about microwave photonic signal processing based on parameter-to-time mapping, where the parameters under test, such as the frequency or temperature, are mapped to the time interval of the output pulses. Parameter-to-time mapping relationship is therefore established and the parameter can be measured by using a low-speed time-domain acquisition equipment. The microwave photonic signal processing schemes based on parameter-to-time mapping feature low-cost and high resolution, which have great potential in applications such as radar, electronic warfare and metrology systems. © 2024 SPIE.

关键词： Microwave measurement

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Calibration of the Solar X-ray Detector on-board the Macao Science Satellite-1B for Soft X-ray Detection

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Science China Earth Sciences 2025年第1期68卷 11-26页

作者： Man-Hei NG Xiaoping ZHANG Jianwu CHEN Yongqiang SHI Fuchang ZUO Wenxi PENG Weichun FU Liansheng LI Pengwei LUO Chi-Long TANG Guozheng ZHANG Zhiwu MEI Li WANG Cunhui LI Jiaming OU Yanyan Xu State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao999078China Space Optoelectronic Measurement and Perception Laboratory Beijing Institute of Control EngineeringBeijing100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou730000China China National Space Administration(CNSA) Macao Center for Space Exploration and ScienceMacao999078China

The Solar X-ray Detector(SXD)on-board the Macao Science Satellite-1B(MSS-1B)was successfully launched via the Chinese Long March-2C rocket on 21 May 2023,and commenced operations in early June of the same *** MSS-1B/Soft X-ray Detection Units(SXDUs)employ two silicon drift detectors(SDDs),providing a wide range of energy spectra spanning from 0.7 to 24 ***,the SXDUs deliver a high-resolution capability of 0.14 keV@5.9 keV and operate with a time cadence of 1 ***,we perform thorough calibrations of the MSS-1B/SXDUs,employing a combination of ground experiments and *** addition,quantitative analysis comparing the flux measurements obtained by the MSS-1B/SXDUs to the data collected by the Geostationary Operational Environmental Satellite(GOES),provides compelling evidence of their ***,the preliminary spectral analysis results showcase the robustness and expected performance of the MSS-1B/SXDUs,unlocking their potential for facilitating the study of dynamic evolution of solar ***,the innovative MSS-1B/Solar X-ray Detector facilitates concurrent observations of solar soft and hard X-rays,thereby making valuable contributions to the advancements in solar research.

关键词： Macao Science Satellite-1B(MSS-1B) Calibration Solar X-Ray Detector Spectrometer Soft X-rays Solar flares Solar abundances

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