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Proceedings Paper

Ames Research Center Cryogenic Mirror Testing Program. A Comparison Of The Cryogenic Performance Of Metal And Glass Mirrors With Different Types Of Mounts.
Author(s): Jacob H. Miller; Ramsey K Melugin; Gordon C. Augason; Steven D. Howard; G.Mark Pryor
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Paper Abstract

A summary of the cryogenic testing of glass and metal mirrors performed at NASA Ames Research Center (ARC) and two other places is presented. Recent improvements to the ARC Cryogenic Optics Test Facility are described. The purposes of the tests were to determine: (1) how glass mirrors would perform at cryogenic temperatures compared with metal mirrors and (2) how various mirror mounts would affect the cryogenic performance of mirrors. Details of a cryogenic test of a 50 cm "double arch," fused-silica mirror with a three-point mount and with a radially-compliant, flexured mount are given. Within the accuracy of the measurements, it was determined that the flexured mount did not induce appreciable distortion in the double arch mirror. Results of the cryogenic tests of a number of glass mirrors and two beryllium mirrors are included. The cryogenic distortion of the glass mirrors was found to be less than that for the beryllium mirrors. Within the accuracy of the measurements, no hysteresis was found in the glass mirrors. It was possible to measure hysteresis in one of the beryllium mirrors.

Paper Details

Date Published: 27 April 1988
PDF: 9 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988);
Show Author Affiliations
Jacob H. Miller, NASA/Ames Research Center (United States)
Ramsey K Melugin, NASA/Ames Research Center (United States)
Gordon C. Augason, NASA/Ames Research Center (United States)
Steven D. Howard, Information Management International, Inc (United States)
G.Mark Pryor, Information Management International, Inc (United States)

Published in SPIE Proceedings Vol. 0973:
Cryogenic Optical Systems and Instruments III
Ramsey K. Melugin; Warren G. Pierce, Editor(s)

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