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Proceedings Paper

Quality evaluation of spaceborne SiC mirrors: the effects on mirror accuracy by variation in the thermal expansion property of the mirror surface
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Paper Abstract

A large-scale lightweight mirror that is made of silicon carbide-based material is required for the coming astronomical and earth observation missions. The influence of the inhomogeneity of the coefficient of thermal expansion (CTE) on specular surface accuracy was studied as an important technological issue for such a large optical component. At first, a systematic case study for the series of CTE’s main factors was conducted using the finite element method, and consequently a comprehensive equation to calculate the amount of surface deviation was derived. Based on that technology, finite element analysis to simulate the surface accuracy profile that a test mirror sample showed during cryogenic measurement was carried out using experimentally obtained CTE data from cutout test pieces, and the profile was successfully reproduced.

Paper Details

Date Published: 5 September 2017
PDF: 7 pages
Proc. SPIE 10372, Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems III, 103720F (5 September 2017); doi: 10.1117/12.2273703
Show Author Affiliations
Masaki Kotani, Japan Aerospace Exploration Agency (Japan)
Tadashi Imai, Japan Aerospace Exploration Agency (Japan)
Haruyoshi Katayama, Japan Aerospace Exploration Agency (Japan)
Hidehiro Kaneda, Nagoya Univ. (Japan)
Takao Nakagawa, Japan Aerospace Exploration Agency (Japan)
Keigo Enya, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 10372:
Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems III
Matthias Krödel; Joseph L. Robichaud; Bill A. Goodman, Editor(s)

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