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Improving the Measurement Accuracy of Water Partial Pressure Using the Major Constituent Analyzer

Journal Article
2009-01-2432
ISSN: 1946-3855, e-ISSN: 1946-3901
Published July 12, 2009 by SAE International in United States
Improving the Measurement Accuracy of Water Partial Pressure Using the Major Constituent Analyzer
Sector:
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, https://doi.org/10.4271/2009-01-2432.
Language: English

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.