大口径主镜位置的实时检测

李剑锋; 吴小霞; 李玉霞; 刘昌华

doi:10.3788/OPE.20162411.2721

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大口径主镜位置的实时检测

微纳技术与精密机械 | 更新时间：2020-07-07

- 大口径主镜位置的实时检测
- On line measurement of position for large primary mirror
- 光学精密工程 2016年24卷第11期页码：2721-2729
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所光电探测部, 吉林长春 130033
- 作者简介：
  
  李剑锋(1982-),男,河北石家庄人,博士,副研究员,2004年于大连理工大学获得学士学位,2009年于中国科技大学获得博士学位,主要从精密光机结构设计研究。E-mail:ljfengli@126.comE-mail:ljfengli@126.com
  [ "吴小霞(1981-),女,江苏盐城人,博士,副研究员,2003年于吉林大学获得学士学位,2008年于中国科学院长春光学精密机械与物理研究所获得博士学位,主要研究方向为大口径反射镜主动支撑系统设计和系统仿真分析。E-mail:wu-xiaoxia@sohu.com" ]
- 基金信息：
  
  中国科学院长春光学精密机械与物理研究所重大创新项目专项基金资助项目(Y3C122E130)
- DOI：10.3788/OPE.20162411.2721
  中图分类号： TH743
- 收稿日期：2016-02-05，
  
  录用日期：2016-3-17，
  
  纸质出版日期：2016-11-25
- 稿件说明：
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李剑锋, 吴小霞, 李玉霞, 等. 大口径主镜位置的实时检测[J]. 光学精密工程, 2016,24(11):2721-2729.

Jian-feng LI, Xiao-xia WU, Yu-xia LI, et al. On line measurement of position for large primary mirror[J]. Editorial office of optics and precision engineeri, 2016, 24(11): 2721-2729.
李剑锋, 吴小霞, 李玉霞, 等. 大口径主镜位置的实时检测[J]. 光学精密工程, 2016,24(11):2721-2729. DOI： 10.3788/OPE.20162411.2721.

Jian-feng LI, Xiao-xia WU, Yu-xia LI, et al. On line measurement of position for large primary mirror[J]. Editorial office of optics and precision engineeri, 2016, 24(11): 2721-2729. DOI： 10.3788/OPE.20162411.2721.

摘要

由于望远镜主镜位置的调整与主镜位置的实时监测相关，本文设计了基于位移传感器的主镜位置监测系统。重点考虑镜室重力变形的影响，利用解析几何方法得到了解算主镜位置的算法。以实验室的1.2 m SiC主镜作为试验镜进行了主镜位置实时监测试验。在主镜绕支撑架做俯仰转动时，通过布置在主镜背部和侧向的6个位移传感器，实时采集测量数据，并利用有限元方法计算镜室的变形；最后将镜室变形作为系统差和传感器测量值代入解算算法，得到主镜沿

X、Y、Z

三向平移、绕

X、Y

轴转动角度及主镜半径随温度变化值。测试结果显示：该试验主镜的支撑系统中的轴向支撑刚度远大于侧向支撑刚度。当镜室转动45°时，主镜的

向平移变化只有20

m，而

向平移和

向平移分别为146

m和100

m。试验结果验证了提出的实时监测方法和监测系统的准确性，为大口径主镜实时位置校正提供了依据。

Abstract

When the primary mirror position of a telescope is adjusted

its position should be measured in real time. This paper proposes an on line measuring system for the primary mirror position based on position sensors. By taking the deformation of a mirror cell into account

a algorithm to solve the primary mirror position was obtained by using the space analytic geometry method. A 1.23 m SiC mirror in our lab was used to complete the online measuring experiment for the primary mirror position. The measuring data were collected in real time by using 6 position sensors fixed at the back and later of the mirror when the mirror was turning around the rotation axis. The cell deformation was also analyzed by using finite element method. Finally

the measuring values by the sensors and the cell deformation value were taken as the system's difference to introduce the algorithm to obtain the

X\Y\Z

displacements

rotation angles around

X\Y

axis and the extension of mirror radius caused by temperature changing. Experimental results indicate that the stiffness of axial supporting mechanism is much larger than that of the lateral one. When the rotation angle of mirror is 45°

the mirror displacement in

direction is about 20

and that in

and

directions are 146

m and 100

respectively. The accuracy of this method is verified by the test results

which provides a reference for the correction of primary mirror positions in telescopes.

关键词

Keywords

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