Optical measurement of the MSX local H2O density

Details Optical measurement of the MSX local H2O density Optical measurement of the MSX local H2O density

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2864..181g&link_type=abstract

Proc. SPIE Vol. 2864, p. 181-186, Optical System Contamination V, and Stray Light and System Optimization, A. Peter M. Glassford

Computer Science

Scientific paper

The krypton radiometer (KR) is one of a suite of instruments that monitor the gaseous and particulate contamination environments of the midcourse space experiment (MSX) spacecraft. The krypton radiometer measures the local water density in a volume of space approximately 50 cm from the spacecraft near its +X/+Y/+Z corner. The instrument comprises an array of krypton VUV lines source lamps that dissociate water and a near UV radiometer that detects the chemiluminescence from the OH dissociation products. Ground calibrations indicate that the instrument has sufficient sensitivity to detect water densities as low as 1.5 multiplied by 107 molecules cm-3. Water is the primary outgassing species during the early part of a spaceflight. Water deposition is also a particular concern to cryogenic sensors, such as the spatial infrared imaging telescope III (SPIRIT III) on this spacecraft. As the mission progresses, we will correlate the KR measurements of the water density with measurements by the neutral mass spectrometer, total pressure sensor and cryogenic quartz crystal microbalance. Using the MSX external contamination model we will create a complete description of the MSX water environment including outgassing, return flux and deposition, and effects.

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