Flashlamp instruments for measuring the Midcourse Space Experiment satellite contamination environment

Details Flashlamp instruments for measuring the Midcourse Space Experiment satellite contamination environment Flashlamp instruments for measuring the Midcourse Space Experiment satellite contamination environment

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998rsci...69.3984g&link_type=abstract

Review of Scientific Instruments, Volume 69, Issue 11, pp. 3984-3991 (1998).

Computer Science

Spaceborne And Space Research Instruments, Apparatus, And Components, Photometric, Polarimetric, And Spectroscopic Instrumentation, Artificial Earth Satellites

Scientific paper

The xenon flashlamp (XF) and krypton lamp and radiometer (KLR) are two of a suite of instruments that monitor the particulate and gaseous contamination environments of the Midcourse Space Experiment spacecraft. The near-field particulate measurement comprises the high-intensity XF that illuminates a volume of space in the field of view of a wide field-of-view visible imager. Radiation scattered by illuminated contaminant particles is imaged. The intensity of the radiation is related to a particle's size and composition. The particle's track yields information about its velocity and trajectory. From ground calibration data we estimate a sensitivity to detect particles smaller than 1 μm and to determine cross-field velocities from 1 mm s-1 to 50 m s-1. We present early mission particulate data from known particle-generating events and from comparatively quiescent times. These results are consistent with previous measurements. The KLR measures the local H2O density in a volume of space approximately 0.5 m from one corner of the spacecraft. The instrument comprises an array of krypton vacuum ultraviolet line source lamps that dissociate H2O 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 H2O densities as low as 1.5×107 molecules cm-3. H2O is the primary outgassed species during the early part of a spaceflight, and is a particular concern to cryogenic sensors, such as the Spatial Infrared Imaging Telescope III (SPIRIT III) on this spacecraft. Early mission results are in overall agreement with prelaunch predictions.

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