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Proceedings Paper

The design research of the test support structure for a large-diameter main mirror
Author(s): Jiao-hong Shi; Shi-kui Luo; Hai-pei Ren; Lu Tang; Ting-yun Luo; Yi-feng Mao
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Paper Abstract

The accuracy of the main mirror surface shape measurement on ground is vital because of the importance of the main mirror in a optical remote sensor. Generally speaking, the main effects of the mirror surface shape measurement accuracy are due to the optical measurement system and support structure. The aim of this thesis is researching the design of the mirror shape measurement support structure. The main mirror discussed in this paper equipped with 650mm diameter. The requirements of PV and RMS for surface shape are no more than 0.136λ and 0.017λ respectively while λ is determined as 632.8nm. At present, the on ground adjustment methods of camera lens are optical axis horizontal and gravity discharging. In order to make the same condition between camera lens adjustment and main mirror operating, the surface shape measurement of main mirror should keep optical axis horizontal condition for mirror either.

The support structure of the mirror introduced in this paper is able to extremely reduce the surface shape distortion caused by the effects of support structure mostly. According to the simulating calculation, the variation of main mirror surface shape is no more than 0.001λ. The result is acceptable for camera adjustment. Based on the measurement support structure mentioned before, the main mirror could rotate 360-degree under the condition of optical axis horizontal; the four-direction measurement for mirror is achieved. Eliminate the effects of ground gravity for surface shape measurement data, the four-direction mirror shape error is controlled no more than 0.001λ on this support structure which calculated by simulation.

Paper Details

Date Published: 10 January 2018
PDF: 6 pages
Proc. SPIE 10616, 2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 106160E (10 January 2018); doi: 10.1117/12.2296848
Show Author Affiliations
Jiao-hong Shi, Beijing Institute of Space Mechanics and Electricity (China)
Shi-kui Luo, Beijing Institute of Space Mechanics and Electricity (China)
Hai-pei Ren, Beijing Institute of Space Mechanics and Electricity (China)
Lu Tang, Beijing Institute of Space Mechanics and Electricity (China)
Ting-yun Luo, Beijing Institute of Space Mechanics and Electricity (China)
Yi-feng Mao, Beijing Institute of Space Mechanics and Electricity (China)


Published in SPIE Proceedings Vol. 10616:
2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Baohua Jia; Kimio Tatsuno; Liquan Dong, Editor(s)

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