Active maintenance of a segmented mirror based on edge and tip sensing
Active maintenance of a segmented mirror based on edge and tip sensing
复制标题
基于边缘和尖端传感的分段镜的主动维护
DOI：
10.1364/ao.431763
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发表时间：
2021-08-20
期刊：
影响因子：
1.9
通讯作者：
Xu, Fangyu
中科院分区：
文献类型：
--
作者：
Wang, Bin;Dai, Yichun;Xu, Fangyu
8 m环孔径分段望远镜是中国巨太阳望远镜（CGST）工程的重要组成部分之一。此外，主镜的主动控制也成为8 m环形太阳望远镜（8 m φ）的关键技术。由于环形光阑的特殊性，分段光阑的主动维护面临着边缘检测不能提供足够的信息来实现闭环控制的问题。提出了一种利用边缘和尖端检测来完成8 m光栅主动维护的方案。为了研究边缘检测与针尖检测相结合的可行性和性能，搭建了一个两段式反射镜工作台，并进行了主动维护分析和实验。两个电容传感器被用来检测段之间的边缘高度的变化，和夏克哈特曼传感器被用来检测段的倾翻和倾斜的变化。在100 min内获得了稳定的镜像，并且镜像误差保持在18.94 nm。本文的工作将为分段环望远镜主动控制的实现提供参考，也为CGST主镜的选择提供依据。(C)2021美国光学学会
An 8 m ring aperture segmented telescope is one of the important elements of the Chinese Giant Solar Telescope (CGST) project. In addition, active control of the primary mirror has become a key technology of the 8 m ring solar telescope (8 m RST). Due to the particularity of the ring aperture, the active maintenance of the segmented RST faces the following problem: edge detection cannot provide enough information to fulfil the closed-loop control. A scheme of using edge and tip detection to complete the active maintenance of an 8 m RST has been proposed. To study the feasibility and performance of edge detection combined with tip detection, we built a workbench of a two-segmented mirror and carried out an active maintenance analysis and experiment. Two capacitive sensors were used to detect the edge height change between the segments, and a Shack-Hartmann sensor was used to detect the tip and tilt change of the segment. A stable mirror figure was achieved during 100 min, and the mirror figure error was maintained at 18.94 nm. This work will provide reference for the implementation of the active control for a segmented ring telescope and also give evidence for the choice of the primary mirror of the CGST. (C) 2021 Optical Society of America