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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 8 — Mar. 10, 2008
  • pp: 1122–1128

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

Hidehiro Kaneda, Takao Nakagawa, Takashi Onaka, Keigo Enya, Sin’itirou Makiuti, Junji Takaki, Masaki Haruna, Masami Kume, and Tsuyoshi Ozaki  »View Author Affiliations


Applied Optics, Vol. 47, Issue 8, pp. 1122-1128 (2008)
http://dx.doi.org/10.1364/AO.47.001122


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Abstract

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.

© 2008 Optical Society of America

OCIS Codes
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(220.4840) Optical design and fabrication : Testing
(230.4040) Optical devices : Mirrors
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: October 9, 2007
Manuscript Accepted: January 6, 2008
Published: March 10, 2008

Citation
Hidehiro Kaneda, Takao Nakagawa, Takashi Onaka, Keigo Enya, Sin'itirou Makiuti, Junji Takaki, Masaki Haruna, Masami Kume, and Tsuyoshi Ozaki, "Cryogenic optical measurements of 12-segment-bonded carbon-fiber-reinforced silicon carbide composite mirror with support mechanism," Appl. Opt. 47, 1122-1128 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-8-1122

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