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Liquid helium Dewar for one meter mirror testingThe 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, and (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.
Document ID
19920040238
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sarver, George L., III
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Ground Support Systems And Facilities (Space)
Meeting Information
Meeting: Cryogenic Optical Systems and Instruments IV
Location: San Diego, CA
Country: United States
Start Date: July 10, 1990
End Date: July 12, 1990
Sponsors: SPIE
Accession Number
92A22862
Distribution Limits
Public
Copyright
Other

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