Cryogenic optical measurements of 12-segment-bonded carbon-fiber-reinforced silicon carbide composite mirror with support mechanism

Cryogenic optical measurements of 12-segment-bonded carbon-fiber-reinforced silicon carbide composite mirror with support mechanism

A 720 mm diameter 12-segment-bonded carbon-fiber-reinforced silicon carbide (C/SiC) composite mirror has been fabricated and tested at cryogenic temperatures. Interferometric measurements show significant cryogenic deformation of the C/SiC composite mirror, which is well reproduced by a model analys...

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Veröffentlicht in:Applied Optics 2008-03, Vol.47 (8), p.1122-1128
Hauptverfasser: Kaneda, Hidehiro, Nakagawa, Takao, Onaka, Takashi, Enya, Keigo, Makiuti, Sin'itirou, Takaki, Junji, Haruna, Masaki, Kume, Masami, Ozaki, Tsuyoshi
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container_end_page 1128
container_issue 8
container_start_page 1122
container_title Applied Optics
container_volume 47
creator Kaneda, Hidehiro
Nakagawa, Takao
Onaka, Takashi
Enya, Keigo
Makiuti, Sin'itirou
Takaki, Junji
Haruna, Masaki
Kume, Masami
Ozaki, Tsuyoshi
description A 720 mm diameter 12-segment-bonded carbon-fiber-reinforced silicon carbide (C/SiC) composite mirror has been fabricated and tested at cryogenic temperatures. Interferometric measurements show significant cryogenic deformation of the C/SiC composite mirror, which is well reproduced by a model analysis with measured properties of the bonded segments. It is concluded that the deformation is due mostly to variation in coefficients of thermal expansion among segments. In parallel, a 4-degree-of-freedom ball-bearing support mechanism has been developed for cryogenic applications. The C/SiC composite mirror was mounted on an aluminum base plate with the support mechanism and tested again. Cryogenic deformation of the mirror attributed to thermal contraction of the aluminum base plate via the support mechanism is highly reduced by the support, confirming that the newly developed support mechanism is promising for its future application to large-aperture cooled space telescopes.
doi_str_mv 10.1364/AO.47.001122
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title Cryogenic optical measurements of 12-segment-bonded carbon-fiber-reinforced silicon carbide composite mirror with support mechanism
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