CFRP composite mirrors for space telescopes and their micro-dimensional stability

Shin Utsunomiya; Tomohiro Kamiya; Ryuzo Shimizu

doi:10.1117/12.856637

22 July 2010 CFRP composite mirrors for space telescopes and their micro-dimensional stability

Shin Utsunomiya, Tomohiro Kamiya, Ryuzo Shimizu

Proceedings Volume 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation; 77392M (2010) https://doi.org/10.1117/12.856637
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Ultra-lightweight and high-accuracy CFRP (carbon fiber reinforced plastics) mirrors for space telescopes were fabricated to demonstrate their feasibility for light wavelength applications. The CTE (coefficient of thermal expansion) of the all- CFRP sandwich panels was tailored to be smaller than 1×10^-7/K. The surface accuracy of mirrors of 150 mm in diameter was 1.8 um RMS as fabricated and the surface smoothness was improved to 20 nm RMS by using a replica technique. Moisture expansion was considered the largest in un-predictable surface preciseness errors. The moisture expansion affected not only homologous shape change but also out-of-plane distortion especially in unsymmetrical compositions. Dimensional stability due to the moisture expansion was compared with a structural mathematical model.

Citation Download Citation

Shin Utsunomiya, Tomohiro Kamiya, and Ryuzo Shimizu "CFRP composite mirrors for space telescopes and their micro-dimensional stability", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77392M (22 July 2010); https://doi.org/10.1117/12.856637

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