Improving the Measurement Accuracy of Water Partial Pressure Using the Major Constituent Analyzer
Date Published: 2009-07-12
Paper Number:2009-01-2432
DOI: 10.4271/2009-01-2432
Citation:
Gardner, B., Erwin, P., Lee, W., Tissandier, A. et al., "Improving the Measurement Accuracy of Water Partial Pressure Using the Major Constituent Analyzer," SAE Int. J. Aerosp. 4(1):285-290, 2011, doi:10.4271/2009-01-2432.
Author(s):
Ben D. Gardner - Hamilton Sundstrand Space Systems International
Phillip M. Erwin - Hamilton Sundstrand Space Systems International
Wai Tak Lee - Hamilton Sundstrand Space Systems International
Amber M. Tissandier - Hamilton Sundstrand Space Systems International
Souzan M. Thoresen - Hamilton Sundstrand Space Systems International
Abstract:
The Major Constituent Analyzer (MCA) is a mass spectrometer based system that measures the major components of the International Space Station (ISS) atmosphere, including water. The measurement of water vapor has been difficult due to adsorption on various surfaces in the sample path, and has thus far been discounted in MCA atmosphere monitoring. This paper summarizes the results in identifying the primary source of the problem, the modeling being used to further elucidate the water surface adsorption/desorption process, and the proposed means available to provide a stable calibration and accurate measure of the water abundance.
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