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Proceedings Paper

Liquid helium dewar for 1-m mirror testing
Author(s): George L. Sarver III
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Paper Abstract

The NASA Ames Research Center has developed a baseline design for a One Meter Cryogenic Optical Test Facility (OMF) incorporating a liquid helium Dewar for cryogenic optical testing of one-meter-class mirrors, principally the Space Infrared Telescope Facility (SIRTF) primary mirror. The primary requirements for the test facility are as follows: 1) The facility must be capable of interferometrically testing any mirror, positioned face-up or face-down, with a diameter less than 1.5 meters and a radius of curvature from 1.5 to 5.5 meters. 2) The facility must achieve and maintain, for 24 hours, a mirror temperature of 4 K with a maximum radiative heat load of less than 500 mW to the mirror, using stored liquid helium and liquid nitrogen. 3) The facility must include a vibration-isolated metrology structure between the test mirror and an external interferometer. 4) The facility must be operated by two persons and a test, starting from the mounting of a mirror to the removal of a mirror, must be conducted within one week.

Paper Details

Date Published: 1 November 1990
PDF: 8 pages
Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); doi: 10.1117/12.23041
Show Author Affiliations
George L. Sarver III, NASA/Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1340:
Cryogenic Optical Systems and Instruments IV
Ramsey K. Melugin; Gerald R. Pruitt, Editor(s)

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