Accurate measurement of deflection of primary and secondary mirrors of large-aperture telescope

CHEN Baogang; WANG Jianli; ZHANG Yan

doi:10.37188/OPE.20223023.3013

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Accurate measurement of deflection of primary and secondary mirrors of large-aperture telescope

更新时间：2022-12-20

- Accurate measurement of deflection of primary and secondary mirrors of large-aperture telescope
- Optics and Precision Engineering Vol. 30, Issue 23, Pages: 3013-3020(2022)
- 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.合肥工业大学仪器科学与光电工程学院，安徽合肥 230009
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20223023.3013
  CLC： TH703
- Received：27 September 2022，
  
  Revised：24 October 2022，
  
  Published：10 December 2022
- 稿件说明：
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陈宝刚,王建立,张岩.大口径望远镜主次镜弯沉的精确测量[J].光学精密工程,2022,30(23):3013-3020.

CHEN Baogang,WANG Jianli,ZHANG Yan.Accurate measurement of deflection of primary and secondary mirrors of large-aperture telescope[J].Optics and Precision Engineering,2022,30(23):3013-3020.
陈宝刚,王建立,张岩.大口径望远镜主次镜弯沉的精确测量[J].光学精密工程,2022,30(23):3013-3020. DOI： 10.37188/OPE.20223023.3013.

CHEN Baogang,WANG Jianli,ZHANG Yan.Accurate measurement of deflection of primary and secondary mirrors of large-aperture telescope[J].Optics and Precision Engineering,2022,30(23):3013-3020. DOI： 10.37188/OPE.20223023.3013.

摘要

为了精确测量与修正大口径望远镜主次镜弯沉，从而保证成像质量及指向精度，从大口径望远镜自身结构特点出发，分析了主次镜位姿变化的影响因素，提出了一种基于内调焦光管的光学测量方法。对主次镜间距5.5 m的某望远镜进行测量，测得水平方向径向偏移最大为196 μm，垂直方向径向偏移最大为16 μm，水平方向角度偏转最大为2.6″，垂直方向角度偏转最大为12.8″。最后对该方法的测量不确定度进行分析，测量径向偏移的合成标准不确定度为9 μm，测量角度偏转的合成标准不确定度为0.65″，满足大口径望远镜光学系统的对准精度要求。

Abstract

With continuous increases in the apertures of ground-based telescopes， the size and weight of the lens barrel structure is becoming greater and greater， and the spatial position change of the primary and secondary mirrors caused by the finite rigidity of the structure and the change of the gravity field is becoming increasingly obvious. The accurate measurement and correction of the deflection of the primary and secondary mirrors of a large-aperture telescope is a necessary prerequisite to ensure its imaging quality and pointing accuracy. Based on the structural characteristics of a large-aperture telescope， the factors affecting the position and attitude of the primary and secondary mirrors are analyzed， and an optical measurement method based on the internal focusing collimator is proposed. A telescope with a distance of 5.5 m between the primary and secondary mirrors is measured as an example. The maximum radial offset in the horizontal direction is 196 μm， the maximum radial offset in the vertical direction is 16 μm； the maximum angular deflection in the horizontal direction is 2.6″， and the maximum angular deflection in the vertical direction is 12.8″. Finally， the measurement uncertainty involved in this method is analyzed. The combined standard uncertainty of measuring radial offset is 9 μm， and the combined standard uncertainty of measuring angular deflection is 0.65″， meeting the alignment accuracy of large-aperpure telescopes.

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