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.
Improving the Measurement Accuracy of Water Partial Pressure Using the Major Constituent Analyzer
Sae Int. J. Aerosp
International Conference On Environmental Systems ; 2009
Sae International Journal of Aerospace ; 4 , 1 ; 285-290
2009-07-12
6 pages
Conference paper
English
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