Flexible passive support system for 2 m SiC reflective mirror

Fu-guo WANG; Bing QIAO; Jing-xu ZHANG

doi:10.3788/OPE.20172510.2591

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Flexible passive support system for 2 m SiC reflective mirror

Ground-based Large-aperture Optical Engineering | 更新时间：2020-08-13

- Flexible passive support system for 2 m SiC reflective mirror
- Optics and Precision Engineering Vol. 25, Issue 10, Pages: 2591-2598(2017)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172510.2591
  CLC： TH743;TH703
- Received：28 April 2017，
  
  Accepted：06 June 2017，
  
  Published：25 October 2017
- 稿件说明：
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Fu-guo WANG, Bing QIAO, Jing-xu ZHANG. Flexible passive support system for 2 m SiC reflective mirror[J]. Optics and precision engineering, 2017, 25(10): 2591-2598.
DOI：

Fu-guo WANG, Bing QIAO, Jing-xu ZHANG. Flexible passive support system for 2 m SiC reflective mirror[J]. Optics and precision engineering, 2017, 25(10): 2591-2598. DOI： 10.3788/OPE.20172510.2591.

摘要

针对2 m SiC反射镜在地基望远镜中的应用，结合SiC反射镜热膨胀系数大、重量轻的特点，设计了柔性被动支撑系统。该系统底支撑whiffletree结构中的支撑杆采用柔性细杆，侧支撑杆采用柔性铰链结构，从而使底支撑系统和侧支撑系统分别起支撑作用，不但保证了主镜良好的位置误差和形状误差还很好地消除了装配应力和热应力。对在支撑系统作用下反射镜进行了静力学分析、热力学分析和模态分析，并通过面形检测和主镜倾斜与平移检测验证了分析结果。检测显示：反射镜面形（RMS）达到λ/40（光轴竖直）和λ/16（光轴水平），主镜指向不同俯仰角时最大倾斜变化量为8"，偏心为0.070 7 mm，基本与分析结果吻合，达到了设计要求，表明这种柔性支撑系统具有很好的工程应用能力。

Abstract

To apply SiC mirror in a ground-based telescope

a flexible passive support system was designed on its high thermal expansion coefficient and high rigidity. In this system

a thin and long flexible rod was used in the axial support whiffletree structure and a flexure joint rod wad used in the lateral support structure. By which

the axial support structure and the lateral support structure could support the system respectively. This structure not only allows the primary mirror to be a good position and a shape but also easily eliminate assemble stress and thermal stress. The static analysis

thermal analysis and modal analysis for the mirror were performed under the support system

and then the analytical results were verified by a surface test

mirror inclination test and a displacement test. The test result of the primary mirror shows that the surface error(RMS) is λ/40(the optical axis is vertical) and that (RMS) is λ/16 (the optical axis is horizontal)

the maximum inclination change of the primary mirror at different pitch angles is 8 "and the displacement is 0.070 7 mm.The test results are basically consistent with the analysis results

meeting the design requirements. It shows that this flexible passive support system has good engineering feasibility.

关键词

Keywords

references

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Related Institution

Changchun Institute of Optics, Fine Mechanics and Physics, the Chinese Academy of Sciences

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