Design of SiC mirror subsystem of a space-based astronomy telescope

Liang-jie Feng; Jiao-teng Ding; Gang-yi Zou

doi:10.1117/12.2504931

11 January 2019 Design of SiC mirror subsystem of a space-based astronomy telescope

Liang-jie Feng, Jiao-teng Ding, Gang-yi Zou

Proceedings Volume 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 108370A (2019) https://doi.org/10.1117/12.2504931
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

A Φ450mm primary mirror subsystem of a space-based astronomy telescope was designed with mass, optical surface distortion and reflectivity requirement. The open-back primary mirror was made of pressure-less sintering silicon carbide, light-weighted at a ratio of approximately 70%. Three side supporting invar flexure bipods were designed to minimize the assembling stress and the thermal stress. The high reflection was obtained from the optical surface cementite. The mirror weighted 7kg and the reflectivity was 97% after optical polishing. The mirror subsystem was precisely assembled under the strict technical condition. The optical test with interferometer showed that the optical surface distortion is less than 1/40λ rms, which met the critical optical requirements for the primary mirror of the space-based astronomy telescope.

Citation Download Citation

Liang-jie Feng, Jiao-teng Ding, and Gang-yi Zou "Design of SiC mirror subsystem of a space-based astronomy telescope", Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 108370A (11 January 2019); https://doi.org/10.1117/12.2504931

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