Thirty Meter Telescope tertiary mirror system prototype cell assembly analysis

Peng Guo; Jingxu Zhang; Fei Yang; Hongchao Zhao; Yifei Yang

doi:10.1117/12.2511253

11 January 2019 Thirty Meter Telescope tertiary mirror system prototype cell assembly analysis

Peng Guo, Jingxu Zhang, Fei Yang, Hongchao Zhao, Yifei Yang

Proceedings Volume 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 108370S (2019) https://doi.org/10.1117/12.2511253
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

The Thirty Meter Telescope (TMT) is one of the largest ground-based telescopes currently under construction in the world. Changchun Institute of Optics, Fine Mechanics and Physics(CIOMP) took the task of design and manufacture Tertiary Mirror System (M3S), which is also named Giant Steerable Science Mirror(GSSM). CIOMP decided to design and manufacture a 1/4 scaled prototype of M3S(M3SP) to verify the technical feasibility of M3S design. The tertiary mirror was support by 18 points whiffletree structure along axial direction and 12 points whiffletree structure along lateral direction. Finite Element Model was built to evaluate the system performance. Based on the Finite Element Analysis, the SlopeRMS of tertiary mirror surface figure would be 1.9 μrad when the mirror was pointed vertical under gravity, and was 0.46μrad when the mirror was pointed horizontally. By applying adjust moment on the pivot of axial whiffletree system, the surface figure SlopeRMS when mirror was pointed vertically could be improve to 0.95μrad. The support system’s resonance frequency was 53.7Hz, which indicated that the system stiffness was high enough. Mirror and structure stress level and meet the requirement of system safety.

Citation Download Citation

Peng Guo, Jingxu Zhang, Fei Yang, Hongchao Zhao, and Yifei Yang "Thirty Meter Telescope tertiary mirror system prototype cell assembly analysis", Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 108370S (11 January 2019); https://doi.org/10.1117/12.2511253

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KEYWORDS

Mirrors

Safety

Prototyping

Thirty Meter Telescope

Finite element methods

Telescopes

Temperature metrology

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