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Ames Research Center cryogenic mirror testing program - A comparison of the cryogenic performance of metal and glass mirrors with different types of mountsA 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.
Document ID
19900024202
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miller, Jacob H.
(NASA Ames Research Center Moffett Field, CA, United States)
Melugin, Ramsey K.
(NASA Ames Research Center Moffett Field, CA, United States)
Augason, Gordon C.
(NASA Ames Research Center Moffett Field, CA, United States)
Howard, Steven D.
(NASA Ames Research Center Moffett Field, CA, United States)
Pryor, G. Mark
(Information Management International, Inc. Palo Alto, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Engineering (General)
Meeting Information
Meeting: Cryogenic Optical Systems and Instruments III
Location: San Diego, CA
Country: United States
Start Date: August 17, 1988
End Date: August 19, 1988
Sponsors: SPIE
Accession Number
90A11257
Distribution Limits
Public
Copyright
Other

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