Co-focus error detection of segmented mirrors

Bin ZHENG; Yong-he CHEN; Yu-tian FU

doi:10.3788/OPE.20192701.0026

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Co-focus error detection of segmented mirrors

Modern Applied Optics | 更新时间：2020-08-13

- Co-focus error detection of segmented mirrors
- Optics and Precision Engineering Vol. 27, Issue 1, Pages: 26-33(2019)
- 作者机构：
  
  1.中国科学院上海技术物理研究所红外探测与成像技术重点实验室，上海 200083
  2.中国科学院上海技术物理研究所，上海 200083
  3.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192701.0026
  CLC： TH751;TP391.41
- Received：08 September 2018，
  
  Accepted：08 October 2018，
  
  Published：15 January 2019
- 稿件说明：
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Bin ZHENG, Yong-he CHEN, Yu-tian FU. Co-focus error detection of segmented mirrors[J]. Optics and precision engineering, 2019, 27(1): 26-33.
DOI：

Bin ZHENG, Yong-he CHEN, Yu-tian FU. Co-focus error detection of segmented mirrors[J]. Optics and precision engineering, 2019, 27(1): 26-33. DOI： 10.3788/OPE.20192701.0026.

摘要

基于传统的夏克-哈特曼波前传感技术，针对实验室现阶段所拥有的合成孔径望远镜系统设计了一套共焦检测系统，用于对合成孔径系统的拼接主镜进行倾斜量误差检测。由于受实验平台振动和实验环境气流扰动等因素的影响，导致检测系统的夏克-哈特曼光斑质心阵列做无规则的抖动，检测系统难以实现高精度共焦。针对该问题提出采用连续帧频数据采样叠加滤波处理的方法来克服实验环境因素的影响；将采集的连续帧频数据逐帧处理，相互叠加，分析光斑质心分布规律，通过构建光斑分布图样最小外接矩形获取光斑质心位置，从而有效的提高了共焦检测系统的准确度。实验表明中心镜沿

与

方向的倾斜量误差数据的标准差分别从0.029 7与0.009 2降到了6.0×10

-5

与5.1614×10

-4

。最终光斑质心数据的稳定性得到了不止一个量级的提升，良好的克服了因实验环境因素导致检测系统精度损失的问题，同时也验证了共焦检测系统方案的可行性。

Abstract

Based on the traditional Shack-Hartmann wavefront sensing technology

a co-focus error detection system has been designed for the synthetic aperture system

which is used to detect the tilt error of the segmented primary mirror of the synthetic aperture system. Because of the vibration of the experimental platform and the disturbance of the air flow in the experimental environment

the centroid of mass of the Shack-Hartmann spots array makes irregular jitter which results in the co-focus error detection system not meeting the high-accuracy requirement. In order to solve this problem

a method of continuous frame rate data sampling and image processing is proposed to overcome the influence of environment. The collected video data is processed frame by frame and superimposed on each other to analyze the distribution law of the centroid of mass of the spots array. The minimum circumscribed rectangle of the spots map is constructed to obtain the position of the centroid of the spots

which greatly improves the detection accuracy of the co-focus error detection system. Experiments show that the standard deviations of the tilt error data along the

and

directions of the central mirror were reduced from 0.029 7 and 0.009 2 to 6.0×10

-5

and 5.1614×10

-4

respectively. Finally

the stability of the data of the spot centroid has been increased more than one magnitude

which greatly overcomes the problem of loss of precision of the detection system that is caused by environmental factors. In the meantime

the feasibility of the co-focus error detection system is verified.

关键词

Keywords

references

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