1 November 1990 Liquid helium dewar for 1-m mirror testing
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
George L. Sarver, "Liquid helium dewar for 1-m mirror testing", Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); doi: 10.1117/12.23041; https://doi.org/10.1117/12.23041
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KEYWORDS
Mirrors

Metrology

Cryogenics

Helium

Liquids

Nitrogen

Interferometers

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