Computer Science
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1754..205b&link_type=abstract
In: Optical system contamination: Effects, measurement, control III; Proceedings of the Meeting, San Diego, CA, July 23, 24, 199
Computer Science
Calibrating, Microbalances, Spaceborne Telescopes, Spacecraft Contamination, Frequency Stability, Thermal Cycling Tests, Thermogravimetry
Scientific paper
This paper presents the results of an investigation of the operational characteristics of two cryogenically cooled quartz crystal microbalances (CQCM) which are flight units for the Midcourse Space Experiment (MSX) program. The units were operated at temperatures that ranged from 15 K up to 300 K. During the course of this investigation, the CQCMs were temperature cycled over this range for 5 complete warmup/cooldown cycles using warmup rates of 2.5 K/min and 1.0 K/min. There was concern over stop/start operations on orbit wherein the CQCM power could be turned off for some time. The CQCMs were cycled in this manner to determine the return frequency variations after power restoration. A three week drift test at 15 K was carried out to determine the drift in CQCM frequency with time. Temperature effects of the heat sink attached to the CQCM base were also determined by varying this temperature. Finally, films of nitrogen, oxygen, carbon dioxide, and water were deposited at the 15 K base temperature, and a thermogravimetric analysis was done for each of the gases condensed, both for individual gases and for gas mixtures. The results of these analyses will be used to interpret on-orbit analysis of contaminants that are condensed during operation of the SPIRIT III telescope on the MSX satellite.
Bailey Benjamin Aaron
Bertrand William T.
Bryson R. J.
Houston Jones Jane
Seiber Bryan L.
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