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Proceedings Paper

Thermal Stability of Lightweight Graphite Glass Sandwich Reflectors for Far Infrared Astronomy
Author(s): John H. Bluege; Ramon A. Mayor; William F. Hoffman
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Paper Abstract

Graphite fiber reinforced glass matrix composites are being developed for a variety of structural applications requiring excellent thermomechanical stability. These materials are ideally suited for lightweight, high strength, thermally stable infrared mirrors because of their low density, low thermal expansion, high strength and stiffness, and their ability to be machined, replicated and figured using standard polishing techniques. These properties are particularly promising for applications such as a three-meter balloon-borne far-infrared and submillimeter telescope mirror which must be both very lightweight and able to retain its figure accuracy when cycled between room temperature and its operating temperature of -50°C. This paper presents the results of a set of low temperature optical tests conducted to determine the figure stability of a 30 centimeter diameter frit bonded graphite-glass mir-ror in the +20 to -60°C temperature range using a 10.6 micrometer laser interferometer. The results indicate that the residual change in figure was less than 0.3 micrometers rms.

Paper Details

Date Published: 21 February 1986
PDF: 5 pages
Proc. SPIE 0571, Large Optics Technology, (21 February 1986); doi: 10.1117/12.950415
Show Author Affiliations
John H. Bluege, United Technologies Research Center (United States)
Ramon A. Mayor, United Technologies Research Center (United States)
William F. Hoffman, University of Arizona (United States)


Published in SPIE Proceedings Vol. 0571:
Large Optics Technology
Gregory M. Sanger, Editor(s)

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