Optical measurement of the MSX local H2O density

Gary E. Galica; John J. Atkinson; Giuseppe Aurilio; Orr Shepherd; Jeffrey C. Lesho; O. Manuel Uy

doi:10.1117/12.258308

11 November 1996 Optical measurement of the MSX local H₂O density

Gary E. Galica, John J. Atkinson, Giuseppe Aurilio, Orr Shepherd, Jeffrey C. Lesho, O. Manuel Uy

Proceedings Volume 2864, Optical System Contamination V, and Stray Light and System Optimization; (1996) https://doi.org/10.1117/12.258308
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

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.

Citation Download Citation

Gary E. Galica, John J. Atkinson, Giuseppe Aurilio, Orr Shepherd, Jeffrey C. Lesho, and O. Manuel Uy "Optical measurement of the MSX local H₂O density", Proc. SPIE 2864, Optical System Contamination V, and Stray Light and System Optimization, (11 November 1996); https://doi.org/10.1117/12.258308

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