大型空间望远镜次镜调整机构精度分析与测试

赵海波; 赵伟国; 董吉洪; 杨维帆; 刘奉昌; 周平伟; 姜萍

doi:10.3788/OPE.20192711.2374

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大型空间望远镜次镜调整机构精度分析与测试

微纳技术与精密机械 | 更新时间：2020-08-13

- 大型空间望远镜次镜调整机构精度分析与测试
- Accuracy analysis and testing for secondary mirror adjusting mechanism in large space telescope
- 光学精密工程 2019年27卷第11期页码：2374-2383
- 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：
  
  [ "赵海波(1989-)，男，山西大同人，助理研究员，2014年于西安交通大学获得硕士学位，主要从事空间光学遥感器光机结构设计、空间机构设计等方面的研究。E-mail:zhaohaibo07@sina.com" ]
  [ "赵伟国(1985-)，男，黑龙江大庆人，助理研究员，2010年于西安交通大学获得硕士学位，主要从事空间光学遥感器光机结构、空间机构等方面的设计和研究。E-mail:ciompi@126.com" ]
- 基金信息：
  
  国家自然科学基金青年科学基金资助项目(11703027)
- DOI：10.3788/OPE.20192711.2374
  中图分类号： TH743
- 收稿日期：2019-06-21，
  
  录用日期：2019-7-15，
  
  纸质出版日期：2019-11-15
- 稿件说明：
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赵海波, 赵伟国, 董吉洪, 等. 大型空间望远镜次镜调整机构精度分析与测试[J]. 光学精密工程, 2019,27(11):2374-2383.

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.
赵海波, 赵伟国, 董吉洪, 等. 大型空间望远镜次镜调整机构精度分析与测试[J]. 光学精密工程, 2019,27(11):2374-2383. DOI： 10.3788/OPE.20192711.2374.

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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