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Liu H W, Wu Z Y, Wu J B, et al. Research on centering algorithm of array detector with large field of view[J]. Opto-Electron Eng, 2021, 48(6): 210039. doi: 10.12086/oee.2021.210039
Citation: Liu H W, Wu Z Y, Wu J B, et al. Research on centering algorithm of array detector with large field of view[J]. Opto-Electron Eng, 2021, 48(6): 210039. doi: 10.12086/oee.2021.210039
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Research on centering algorithm of array detector with large field of view

  • 1.

    Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

    • Fund Project: National Natural Science Foundation of China (52075520)
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Received Date 27 January 2021
Revised Date 08 April 2021
Published Date 01 June 2021
    Abstract
  • In order to realize the miniaturization and integration design of space optical communication system, an integrated tracking system based on the array detector and the fast deflection mirror is established. By analyzing the principle of spot position detection of array detector, a centering algorithm is proposed. Firstly, the coarse centering strategy is designed by setting the threshold value. Then, the fine centering is completed by using the database query method. Thirdly, the infinite integral method is used to make the spot return to the origin. Finally, the correctness and feasibility of the algorithm are verified by building an experimental platform. The experimental results show that the tracking field of view can reach 70.3 mrad, which is about 3 times larger than that of the original algorithm, and the maximum tracking error is better than 1.8 μrad, which lays a foundation for further engineering application of the space optical communication system.
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    • Overview

  • Overview: Free space optical communication (FSO) system refers to a communication system that uses laser light wave as an information carrier and free space as an information transmission medium. In recent years, FSO systems are developing towards miniaturization and integration. Acquisition, pointing, and tracking (APT) system is an important part of the FSO system, in order to meet the development of the miniaturization and integration of FSO systems, a photodetector is used in the APT system to replace the original coarse tracking and fine tracking detectors. The coarse tracking system and the fine tracking system are combined into one which simplify the system structure. The array detector has the advantages of high position resolution, small junction capacitance, short response time, and simple processing circuit. It is an ideal photodetector integrating coarse and fine tracking of the APT system. In this paper, the array detector is used as the core component, and the fast steering mirror is used as the auxiliary component to build a laser spot position detection system. In order to improve the field of view and tracking accuracy of spot position detection, by analyzing the principle of spot position detection of the array detector, a homing algorithm for the large field of view array detector is proposed. First, by setting the threshold, a rough centering strategy is designed in which the light spot is not completely on the detector, and the center of the light spot is moved to the 2×2 detection unit in the center of the array detector. Then the database query method is used to complete the fine centering, and the center of the light spot is moved to the detection center within ±0.1 mm. Finally, the infinite integration method is used to calculate the position of the spot centroid, and the spot is moved to the center of the detector. In order to verify the correctness and feasibility of the algorithm, experiments are carried out on the laser spot position detection platform. The experimental results show that the tracking field of view can reach 70.3 mrad, which is about 3 times larger than the original algorithm field of view, and the maximum tracking position error is better than 1.8 μrad, reaching the tracking accuracy index. It has theoretical guiding significance for the miniaturization of FSO system, and lays the foundation for the further engineering application of FSO system.

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