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Proceedings Paper

Thermally induced changes in the focal distance of composite mirrors: composites with a zero coefficient of thermal expansion of the radius of curvature
Author(s): Benjamin P. Dolgin
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Paper Abstract

Calculations are presented of the coefficient of thermal expansion (CTE) of the radius of curvature of the reflector face sheets made of a quasi-isotropic composite. It is shown that, upon cooling, the change of the CTE of the focal distance of the mirror is equal to that of the radius of the curvature of the reflector face sheet. The CTE of the radius of the curvature of a quasi-isotropic composite face sheet depends on both the in-plane and the out-of-plane CTEs. The zero in-plane CTE of a face sheet does not guarantee mirrors with no focal length changes.

Paper Details

Date Published: 16 September 1992
PDF: 6 pages
Proc. SPIE 1690, Design of Optical Instruments, (16 September 1992); doi: 10.1117/12.137999
Show Author Affiliations
Benjamin P. Dolgin, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 1690:
Design of Optical Instruments
David M. Aikens; Victor L. Genberg; Gary C. Krumweide; Michael J. Thomas, Editor(s)

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