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

被引：6
|
作者：
Utsunomiya, Shin [1 ]
Kamiya, Tomohiro [1 ]
Shimizu, Ryuzo [1 ]
机构：
[1] Japan Aerosp Explorat Agcy, Tsukuba, Ibaraki 3058505, Japan
来源：
MODERN TECHNOLOGIES IN SPACE- AND GROUND-BASED TELESCOPES AND INSTRUMENTATION | 2010年 / 7739卷
关键词：
CFRP; mirror; space telescope; moisture absorption; surface preciseness; dimensional stability; CTE;
D O I：
10.1117/12.856637
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 1x10(-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.
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页数：7
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