Journal
ANALYST
Volume 139, Issue 9, Pages 2065-2069Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3an01452e
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Funding
- National Science Foundation (NSF) [EEC-0540832]
- NSF-ANR
- Robert Welch Foundation [C-0586]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1124677] Funding Source: National Science Foundation
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A methane (CH4) and nitrous oxide (N2O) sensor based on a sensitive, selective and well established technique of quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for environmental and biomedical measurements. A thermoelectrically cooled (TEC) distributed feedback quantum cascade laser (DFB-QCL), capable of continuous wave (CW) mode hop free emission in the 7.83 mu m wavelength range, was used as an excitation source. For the targeted CH4 and N2O absorption lines located at 1275.04 cm(-1) and 1275.49 cm(-1) detection limits (1 sigma) of 13 ppbv and 6 ppbv were achieved with a 1 second data acquisition time, respectively. Environmental data of CH4 and N2O mixing ratios acquired using the QEPAS sensor system are also reported.
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