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Proceedings Paper

CFRP composite mirrors for space telescopes and their micro-dimensional stability
Author(s): Shin Utsunomiya; Tomohiro Kamiya; Ryuzo Shimizu
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Paper 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.

Paper Details

Date Published: 22 July 2010
PDF: 7 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77392M (22 July 2010); doi: 10.1117/12.856637
Show Author Affiliations
Shin Utsunomiya, Japan Aerospace Exploration Agency (Japan)
Tomohiro Kamiya, Japan Aerospace Exploration Agency (Japan)
Ryuzo Shimizu, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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