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Proceedings Paper

Quartz crystal microbalance operation and in situ calibration
Author(s): K. Albyn; H. D. Burns
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Paper Abstract

Computer models that predict the rate at which molecular contamination will deposit on optical surfaces typically use outgassing source terms, measured with quartz crystal microbalances, as a basis for the prediction. The American Society of Testing and Materials, Standard Test Method for Contamination Outgassing Characteristics of Spacecraft Materials (Method E-1559), is probably the best know technique used by the aerospace community to measure the outgassing rates or source terms of materials. A simple method for the insitu calibration of quartz crystal microbalances, based on the heat of enthalphy of Adipic Acid, has been developed and demonstrated by the Marshall Space Flight Center, Environmental Effects Branch. The calibration has been demonstrated over a sample temperature range of 25 to 66 degrees Celsius and deposition rates of 2 x 10-11 grams/cm2-s and greater, for several measurement system configurations. This calibration technique is fully compatible with the American Society for Testing and Materials, Method E-1559, as well as other methodology. The calibration requires no modification of outgassing facilities employing an effusion cell and does not degrade the performance or function of typical vacuum systems.

Paper Details

Date Published: 7 September 2006
PDF: 7 pages
Proc. SPIE 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II, 629106 (7 September 2006); doi: 10.1117/12.677657
Show Author Affiliations
K. Albyn, NASA George C. Marshall Space Flight Ctr. (United States)
H. D. Burns, NASA George C. Marshall Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 6291:
Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II
O. Manuel Uy; John C. Fleming; Michael G. Dittman, Editor(s)

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