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Proceedings Paper

Detection of cryogenic water ice contaminants and the IR AI&T environment
Author(s): David K. Lynch; Ray W. Russell
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Paper Abstract

Several remote sensing/infrared space surveillance programs in the midst of assembly, integration and test have recently experienced delays when water vapor was deposited as ice on cold surfaces in a sensor under test or calibration. When these surfaces were at critical locations, the sensitivity or response of the sensor decreased significantly because the ice absorbed the incoming signal. The source of water vapor could be from a chamber leak or outgassing from the sensor system or the vacuum chamber itself. In order to quantify the effects of ice deposits on signals in various spectral bands, published optical constants for amorphous and crystalline water ice have been used to calculate the transmission of water ice films as a function of wavelength from 1 to 20 microns. The results are presented in two ways: spectra of the physical thickness of a layer of ice whose absorption optical depth is unity, and transmission spectra for several characteristic layer thicknesses. These tools can be used in estimating the amount of ice - and by inference water vapor - present in the system. Related calculations can also be used to assess the probability that a given hardware setup or resulting data set is showing signs of degradation of response due to ice absorption, and the implications for those trying to interpret the results.

Paper Details

Date Published: 15 December 2000
PDF: 11 pages
Proc. SPIE 4130, Infrared Technology and Applications XXVI, (15 December 2000); doi: 10.1117/12.409852
Show Author Affiliations
David K. Lynch, The Aerospace Corp. (United States)
Ray W. Russell, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 4130:
Infrared Technology and Applications XXVI
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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