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Ice/frost detection using millimeter wave radiometryA series of ice detection tests was performed on the shuttle external tank (ET) and on ET target samples using a 35/95 GHz instrumentation radiometer. Ice was formed using liquid nitrogen and water spray inside a test enclosure containing ET spray on foam insulation samples. During cryogenic fueling operations prior to the shuttle orbiter engine firing tests, ice was formed with freon and water over a one meter square section of the ET LOX tank. Data analysis was performed on the ice signatures, collected by the radiometer, using Georgia Tech computing facilities. Data analysis technique developed include: ice signature images of scanned ET target; pixel temperature contour plots; time correlation of target data with ice present versus no ice formation; and ice signature radiometric temperature statistical data, i.e., mean, variance, and standard deviation.
Document ID
19810023633
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gagliano, J. A. (Georgia Inst. of Tech. Atlanta, GA, United States)
Newton, J. M. (Georgia Inst. of Tech. Atlanta, GA, United States)
Davis, A. R. (Georgia Inst. of Tech. Atlanta, GA, United States)
Foster, M. L. (Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 4, 2013
Publication Date
August 31, 1981
Subject Category
Space Transportation
Report/Patent Number
NASA-CR-161868
A-2668
Accession Number
81N32176
Funding Number(s)
CONTRACT_GRANT: NAS8-33800
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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