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Development of a cw-laser-based cavity-ringdown sensor aboard a spacecraft for trace air constituentsThe progress in the development of a sensor for the detection of trace air constituents to monitor spacecraft air quality is reported. A continuous-wave (cw), external-cavity tunable diode laser centered at 1.55 micrometers is used to pump an optical cavity absorption cell in cw-cavity ringdown spectroscopy (cw-CRDS). Preliminary results are presented that demonstrate the sensitivity, selectivity and reproducibility of this method. Detection limits of 2.0 ppm for CO, 2.5 ppm for CO2, 1.8 ppm for H2O, 19.4 ppb for NH3, 7.9 ppb for HCN and 4.0 ppb for C2H2 are calculated.
Document ID
20040087826
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Authors
Awtry, A. R.
(The George Washington University Washington, DC 20052, United States)
Miller, J. H.
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Publication Information
Publication: Applied physics. B, Lasers and optics
Volume: 75
Issue: 3-Feb
ISSN: 0946-2171
Subject Category
Environment Pollution
Funding Number(s)
CONTRACT_GRANT: NAG9-1185
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Life Sciences Technologies
Non-NASA Center

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