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Thermal modeling of the NASA-Ames Research Center Cryogenic Optical Test Facility and a single-arch, fused-natural-quartz mirrorA thermal model of the dewar and optical system of the Cryogenic Optical Test Facility at NASA-Ames Research Center was developed using the computer codes SINDA and MONTE CARLO. The model was based on the geometry, boundary conditions, and physical properties of the test facility and was developed to investigate heat transfer mechanisms and temperatures in the facility and in test mirrors during cryogenic optical tests. A single-arch, fused-natural-quartz mirror was the first mirror whose thermal loads and temperature distributions were modeled. From the temperature distribution, the thermal gradients in the mirror were obtained. The model predicted that a small gradient should exist for the single arch mirror. This was later verified by the measurement of mirror temperatures. The temperatures, predicted by the model at various locations within the dewar, were in relatively good agreement with the measured temperatures. The model is applicable to both steady-state and transient cooldown operations.
Document ID
19920040237
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ng, Y. S.
(Sterling Federal Systems, Inc. Palo Alto, CA, United States)
Augason, Gordon C.
(NASA Ames Research Center Moffett Field, CA, United States)
Young, Jeffrey A.
(Sterling Federal Systems, Inc. Palo Alto, CA, United States)
Howard, Steven D.
(Synernet Corp. Fremont, CA, United States)
Melugin, Ramsey K.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Engineering (General)
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
92A22861
Distribution Limits
Public
Copyright
Other

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