Development of CFRP mirrors for low-temperature application of satellite telescopes

Shin Utsunomiya; Tomohiro Kamiya; Ryuzo Shimizu

doi:10.1117/12.926133

13 September 2012 Development of CFRP mirrors for low-temperature application of satellite telescopes

Shin Utsunomiya, Tomohiro Kamiya, Ryuzo Shimizu

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 84502R (2012) https://doi.org/10.1117/12.926133
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Ultra-lightweight and high-accuracy CFRP (carbon fiber reinforced plastics) mirrors for space telescopes were fabricated and their feasibility for low temperature applications was demonstrated. The CFRP mirrors were composed of sandwich panels with CFRP skins and CFRP honeycomb cores. Surface was deposited with epoxy thin layers by using a replica technique. The surface accuracy of the demonstrate mirrors of 150 mm in diameter was 0.8 μm RMS and the surface smoothness was improved to 5 nm RMS. Surface accuracy degradation was 0.6μm RMS (root mean square) from ambient temperature to liquid nitrogen. Surface asperity was classified with respect of their wave intervals and measurement areas. Surface accuracy and dimensional stability were strictly affected by raw materials and manufacturing conditions. Surface accuracy was measured at each process on the way of mirror forming. Manufacturing conditions to depress asperity were discussed.

Citation Download Citation

Shin Utsunomiya, Tomohiro Kamiya, and Ryuzo Shimizu "Development of CFRP mirrors for low-temperature application of satellite telescopes", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84502R (13 September 2012); https://doi.org/10.1117/12.926133

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