Journal
OPTICS LETTERS
Volume 39, Issue 4, Pages 957-960Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.000957
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Funding
- National Science Foundation (NSF) ERC MIRTHE award
- NSF-ANR
- Robert Welch Foundation [C-0586]
- Italian research projects [PON01 02238, PON02 00675, PON02 00576]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1124677] Funding Source: National Science Foundation
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A quartz-enhanced photoacoustic absorption spectroscopy (QEPAS)-based gas sensor was developed for methane (CH4) and nitrous-oxide (N2O) detection. The QEPAS-based sensor was installed in a mobile laboratory operated by Aerodyne Research, Inc. to perform atmospheric CH4 and N2O detection around two urban waste-disposal sites located in the northeastern part of the Greater Houston area, during DISCOVER-AQ, a NASA Earth Venture during September 2013. A continuous wave, thermoelectrically cooled, 158 mW distributed feedback quantum cascade laser emitting at 7.83 mu m was used as the excitation source in the QEPAS gas sensor system. Compared to typical ambient atmospheric mixing ratios of CH4 and N2O of 1.8 ppmv and 323 ppbv, respectively, significant increases in mixing ratios were observed when the mobile laboratory was circling two waste-disposal sites in Harris County and when waste disposal trucks were encountered. (C) 2014 Optical Society of America
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