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Proceedings Paper

Analysis of observed contamination through SAGE III's first year on orbit
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Paper Abstract

The Stratospheric Aerosol and Gas Experiment III (SAGE III) is an external payload on the International Space Station (ISS) that measures vertical profiles of ozone and other atmospheric constituents through the use of a moderate resolution spectrometer with an operating wavelength range of 290 nm to 1550 nm utilizing the method of occultation. Because of the contamination sensitivity [particularly to silicate contamination] of the payload, a suite of eight Thermoelectric Quartz Crystal Microbalances (TQCMs) were included to monitor the operating environment. During the first year of operation, the SAGE III/ISS TQCMs were instrumental in detecting several periods of relatively high contamination and identifying the sources. A transparent window made of quartz crystal covers the instrument assembly's aperture. The contamination window may open during science acquisition under nominal operating conditions. However, if the contamination sensors measure mass adsorption rates significantly elevated above the background level, the window may be commanded to remain closed during science to protect the contamination sensitive scan mirror and telescope. An analysis of the spectral transmission through the window for the wavelength range of 290 nm to 1550 nm has been conducted to determine any possible degradation of the window transmission and potential effects on science data collected to date, and establish a baseline for future analysis.

Paper Details

Date Published: 19 September 2018
PDF: 9 pages
Proc. SPIE 10748, Systems Contamination: Prediction, Control, and Performance 2018, 1074805 (19 September 2018); doi: 10.1117/12.2321982
Show Author Affiliations
Michael P. Thompson, Science Systesms and Applications, Inc. (United States)
Joshua Bangert, Science Systesms and Applications, Inc. (United States)
Samuel Porter, Science Systesms and Applications, Inc. (United States)
David Flittner, NASA Langley Research Ctr. (United States)
Kaitlin Liles, NASA Langley Research Ctr. (United States)
Ryan Stanley, Science Systesms and Applications, Inc. (United States)
Elaine Seasly, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 10748:
Systems Contamination: Prediction, Control, and Performance 2018
Carlos E. Soares; Eve M. Wooldridge; Bruce A. Matheson, Editor(s)

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