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Proceedings Paper

Temperature-Controlled Quartz Crystal Microbalance Measurements On Space Transport System (STs-2)
Author(s): J. A. Fountain
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Paper Abstract

The purpose of the Temperature-Controlled Quartz Crystal Microbalance (TQCM) system on STS-2 was to measure condensible molecular flux in the payload bay of the Space Shuttle as a function of temperature, direction, and time.1 Five quartz crystal microbalance sen-sors were located in the IECM to measure molecular adsorption in each of the Orbiter axes, +X (fore), -X (aft), +Y (starboard), -Y (port), and -Z (up, perpendicular to payload bay). The temperature of each sensor was controlled by a thermoelectric device so contamination could be measured as a function of four preset temperatures: +30, 0, -30, and -60°C. When orbital altitude was reached, the TQCM sensors began their orbital measuring cycle routine (Figure 1). The sensors were commanded to 80°C for 30 min, which was used as an initial clean-up. They were then stepped through a program of 2-nr collection periods at each temperature with a 30-min, 80°C period between each collection period. The collection periods progressed in descending order from +30 to -60°C and, then the cycle was repeated. Since the STS-2 orbital phase lasted approximately 53 hrs, the TQCM system completed four cycles and was in the fifth when the mission was terminated.

Paper Details

Date Published: 12 April 1983
PDF: 6 pages
Proc. SPIE 0338, Spacecraft Contamination Environment, (12 April 1983); doi: 10.1117/12.933632
Show Author Affiliations
J. A. Fountain, NASA/Marshall Space Flight Center (United States)

Published in SPIE Proceedings Vol. 0338:
Spacecraft Contamination Environment
Carl R. Maag, Editor(s)

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