12 October 2004 Development of ultra-light-weight mirror with carbon/carbon composites for optical-IR astronomy
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Abstract
Future large aperture telescope projects will require very lightweight mirrors that can be produced at significantly lower cost and faster production times than currently possible. Tailorable, low thermal expansion composite materials offer an attractive path to achieve these goals. Application of carbon/carbon composites is particularly attractive as these materials do not exhibit the moisture-absorption-related expansion problems observed in typical resin matrix composites. The National Astronomical Observatory of Japan and Mitsubishi Electric Corporation are collaborating to develop materials and surface finishing technologies to enable future carbon/carbon composite mirror applications. Material processing techniques for improved substrate surface finish have been developed. An innovative surface finish approach involving high precision machining of a metal layer applied to the mirror surface has also been developed. As a result, 150mm diameter C/C spherical mirror with honeycomb sandwich structure was successfully demonstrated.
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Hajime Takeya, Hajime Takeya, Masami Kume, Masami Kume, Steven Hahn, Steven Hahn, Tsuyoshi Ozaki, Tsuyoshi Ozaki, Naoki Kohara, Naoki Kohara, Masashi Otsubo, Masashi Otsubo, Saku Tsuneta, Saku Tsuneta, } "Development of ultra-light-weight mirror with carbon/carbon composites for optical-IR astronomy", Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); doi: 10.1117/12.552304; https://doi.org/10.1117/12.552304
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