CW EC-QCL-based sensor for simultaneous detection of H2O, HDO, N2O and CH4ﾠusing multi-pass absorption spectroscopy

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dc.citation.firstpage10391
dc.citation.issueNumber10
dc.citation.journalTitleOptics Express
dc.citation.lastpage10401
dc.citation.volumeNumber24
dc.contributor.authorYu, Yajun
dc.contributor.authorSanchez, Nancy P.
dc.contributor.authorGriffin, Robert J.
dc.contributor.authorTittel, Frank K.
dc.date.accessioned2016-07-06T19:28:53Z
dc.date.available2016-07-06T19:28:53Z
dc.date.issued2016
dc.description.abstractA sensor system based on a continuous wave, external-cavity quantum-cascade laser (CW EC-QCL) was demonstrated for simultaneous detection of atmospheric H2O, HDO, N2O and CH4using a compact, dense pattern multi-pass gas cell with an effective path-length of 57.6 m. The EC-QCL with a mode-hop-free spectral range of 1225-1285 cm−1 operating at ~7.8 µm was scanned covering four neighboring absorption lines, for H2O at 1281.161 cm−1, HDO at 1281.455 cm−1, N2O at 1281.53 cm−1 and CH4 at 1281.61 cm−1. A first-harmonic-normalized wavelength modulation spectroscopy with second-harmonic detection (WMS-2f/1f) strategy was employed for data processing. An Allan-Werle deviation analysis indicated that minimum detection limits of 1.77 ppmv for H2O, 3.92 ppbv for HDO, 1.43 ppbv for N2O, and 2.2 ppbv for CH4 were achieved with integration times of 50-s, 50-s, 100-s and 129-s, respectively. Experimental measurements of ambient air are also reported.
dc.identifier.citationYu, Yajun, Sanchez, Nancy P., Griffin, Robert J., et al.. "CW EC-QCL-based sensor for simultaneous detection of H2O, HDO, N2O and CH4ﾠusing multi-pass absorption spectroscopy." <i>Optics Express,</i> 24, no. 10 (2016) The Optical Society: 10391-10401. http://dx.doi.org/10.1364/OE.24.010391.
dc.identifier.doihttp://dx.doi.org/10.1364/OE.24.010391
dc.identifier.urihttps://hdl.handle.net/1911/90809
dc.language.isoeng
dc.publisherThe Optical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleCW EC-QCL-based sensor for simultaneous detection of H2O, HDO, N2O and CH4ﾠusing multi-pass absorption spectroscopy
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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