Accuracy analysis and testing for secondary mirror adjusting mechanism in large space telescope

Hai-bo ZHAO; Wei-guo ZHAO; Ji-hong DONG; Wei-fan YANG; Feng-chang LIU; Ping-wei ZHOU; Ping JIANG

doi:10.3788/OPE.20192711.2374

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Accuracy analysis and testing for secondary mirror adjusting mechanism in large space telescope

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- Accuracy analysis and testing for secondary mirror adjusting mechanism in large space telescope
- Optics and Precision Engineering Vol. 27, Issue 11, Pages: 2374-2383(2019)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所，吉林长春 130033
  2.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192711.2374
  CLC： TH743
- Received：21 June 2019，
  
  Accepted：15 July 2019，
  
  Published：15 November 2019
- 稿件说明：
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Hai-bo ZHAO, Wei-guo ZHAO, Ji-hong DONG, et al. Accuracy analysis and testing for secondary mirror adjusting mechanism in large space telescope[J]. Optics and precision engineering, 2019, 27(11): 2374-2383.
DOI：

Hai-bo ZHAO, Wei-guo ZHAO, Ji-hong DONG, et al. Accuracy analysis and testing for secondary mirror adjusting mechanism in large space telescope[J]. Optics and precision engineering, 2019, 27(11): 2374-2383. DOI： 10.3788/OPE.20192711.2374.

摘要

为满足大口径离轴三反空间望远镜在轨成像质量需求，设计了一种基于6-PSS并联机构的次镜调整机构，并针对其精度进行了分析与实测。首先，分析了次镜调整机构的组成和光学系统对它的精度需求。随后，以逆运动学分析为基础建立了次镜调整机构的误差模型，并对结构参数、动平台位置、动平台姿态对整机精度的影响进行了理论分析，根据分析结果结合实际空间包络及重量等约束确定结构参数，并采用Monte Carlo模型分析了该结构参数下的次镜调整机构的随机误差和系统误差。最后，搭建了精度测试系统，对次镜六维调整机构的主要技术指标进行了实测。测试结果显示，次镜六维调整机构的位移分辨率优于0.1 μm，角度分辨率优于0.5″，双向重复定位精度达到亚微米/亚角秒量级(±0.4 μm/±0.3″)，其绝对定位精度可以达到微米/角秒量级，满足大型空间望远镜在轨成像要求。

Abstract

To obtain images of high quality from a large space telescope in orbit

an adjustment mechanism for a secondary mirror was developed based on the 6-Prismatic-Spherical-Spherical (6-PSS) parallel mechanism

and the accuracy of the adjustment mechanism was tested. First

the composition and precision requirements for the optical system of the adjustment mechanism for a secondary mirror was analyzed. Next

the error model of the mechanism was established based on its inverse kinematics analysis. Finally

the influences of the structural parameters and position and posture of the dynamic platform on the accuracy of the mechanism were analyzed theoretically. While some structural parameters were selected based on the results of the analysis

others that posed constraints

such as space envelope

weight of the mirror

and random and systematic errors of the mechanism

were analyzed using the Monte Carlo model. Furthermore

a system was developed to test the accuracy of the key technical indicators of the six degrees of freedom (6-DOF) adjustment mechanism for a secondary mirror. The results showed that the displacement resolution

angle resolution

and bidirectional repeatability of the adjustment mechanism were relatively better by 0.1 μm

0.5″

and sub-micron and sub-arc-seconds order (±0.4 μm/±0.3″)

respectively. The absolute positioning accuracy of the adjustment mechanism can be of the order of micron/arc-seconds. It was concluded that the accuracy of the adjustment mechanism for a secondary mirror could meet the needs of large space telescopes in orbit.

关键词

Keywords

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