Sep. 2022

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Chinese Optics> 2022> 15(5): 1079-1091.

LI Zong-xuan, ZHANG Chang-hao, ZHANG De-fu, MA Bin, LI Yun-feng. Flexural mounting technology of a 1.8 m space-borne rectangular mirror[J]. Chinese Optics, 2022, 15(5): 1079-1091. doi: 10.37188/CO.2022-0131

Citation:

LI Zong-xuan, ZHANG Chang-hao, ZHANG De-fu, MA Bin, LI Yun-feng. Flexural mounting technology of a 1.8 m space-borne rectangular mirror[J].Chinese Optics, 2022, 15(5): 1079-1091.doi:10.37188/CO.2022-0131

Citation:

LI Zong-xuan, ZHANG Chang-hao, ZHANG De-fu, MA Bin, LI Yun-feng. Flexural mounting technology of a 1.8 m space-borne rectangular mirror[J].Chinese Optics, 2022, 15(5): 1079-1091.doi:10.37188/CO.2022-0131

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Flexural mounting technology of a 1.8 m space-borne rectangular mirror

doi:10.37188/CO.2022-0131

LI Zong-xuan^{1, 3,,},
ZHANG Chang-hao^{1, 2, 3},
ZHANG De-fu^{1, 3},
MA Bin^{1, 2, 3},
LI Yun-feng^{1, 2, 3}

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Space-Based Dynamic Fast Optical Imaging Technology, Chinese Academy of Sciences, Changchun 130033, China

Funds:Supported by Science and Technology Development Program of Jilin Province (No. 20200201294JC)

More Information

Corresponding author:lizongxuan@ciomp.ac.cn
Received Date:13 Jun 2022
Rev Recd Date:26 Jul 2022

Available Online:15 Sep 2022

Abstract

Abstract

The rectangular primary mirror with aperture of 1.8 m×0.5 m is the crucial component of an off-axis Three Mirror Anastigmat (TMA) space optical system. In order to guaranty the structural stability and reliability of the Primary Mirror Assembly (PMA) and the surface ﬁgure error (RMS value) of the mirror, a bi-axial ﬂexural support has been proposed for the large-size rectangular mirror. First, based on the principle of kinematic equivalent, the initial structure of the bi-axial ﬂexural support was designed and the analytical formula for stiffness and its characteristic was studied as well. Then the mounting position and the key dimensions of the ﬂexural supports were studied and optimized. Finally, the ﬁnal optimization design scheme of the PMA was determined. Experimental results indicate that the surface figure error (RMS value) of the PMA under 1 G gravity in X and Y directions are 4.81 nm and 6.09 nm respectively when the optical axis is placed horizontally, which are less than λ /50 ( λ =632.8 nm). The first-order natural frequency is 104 Hz, which can satisfy the design requirements. The dynamic tests have shown that the dynamic characteristics of the mirror assembly are good, and the flexural support system is stable and reliable. Now the mirror has been polished to have a surface figure better than λ/30 RMS. Zero Gravity optical testing has been performed under ±1 G respectively, which shows good coincidence with the analytical results.
- space optics,
- off-axis TMA optical system,
- rectangular mirror,
- flexural support,
- finite element method,
- dynamitic test

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References (14)

References

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