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Proceedings Paper

Study on the sensitivity of temperature gradient for large aperture SiC lightweight mirror based on active optics
Author(s): Xiangyi Liu; Jingxu Zhang; Xiaoxia Wu; Jianfeng Li; Peng Guo; Qichang An
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Paper Abstract

With the aperture of large ground-based telescopes increasing, thermal issues appear more evidently. As a relatively large thermal expansion coefficient SiC (about 2.5x10-6 /K), it makes large aperture SiC lightweight primary mirror more sensitive to temperature gradient. Firstly, discuss thermal issue of the mirror seeing induced by the temperature difference between the mirror surface and ambient theoretically. Then analyze the mirror surface deformation under seven different steady-state temperature fields with a unit temperature load. A uniform axial gradient can cause a mirror surface deflection RMS which can reach 438.4 nm. According to the simulation results, it shows that the primary is most sensitive to a uniform axial gradient and least to uniform change. Lastly, the parameter of thermal control is determined through the above analysis with the error budget to get a better image quality.

Paper Details

Date Published: 2 September 2014
PDF: 6 pages
Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 92800I (2 September 2014); doi: 10.1117/12.2069485
Show Author Affiliations
Xiangyi Liu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Univ. of Chinese Academy of Sciences (China)
Jingxu Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Xiaoxia Wu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jianfeng Li, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Peng Guo, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Qichang An, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 9280:
7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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