CW DFB-QCL and EC-QCL based sensor for simultaneous NO and NO2 measurements via frequency modulation multiplexing using multi-pass absorption spectroscopy

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dc.citation.articleNumber1011108en_US
dc.citation.journalTitleProceedings of SPIEen_US
dc.citation.volumeNumber10111en_US
dc.contributor.authorYu, Yajunen_US
dc.contributor.authorSanchez, Nancy P.en_US
dc.contributor.authorLou, Minhanen_US
dc.contributor.authorZheng, Chuantaoen_US
dc.contributor.authorWu, Hongpengen_US
dc.contributor.authorGłuszek, Aleksander K.en_US
dc.contributor.authorHudzikowski, Arkadiusz J.en_US
dc.contributor.authorGriffin, Robert J.en_US
dc.contributor.authorTittel, Frank K.en_US
dc.date.accessioned2017-02-08T16:34:32Zen_US
dc.date.available2017-02-08T16:34:32Zen_US
dc.date.issued2017en_US
dc.description.abstractNitrogen oxides (NOx), including nitric oxide (NO) and nitrogen dioxide (NO2) play important roles in determining the photochemistry of the ambient atmosphere, controlling the production of tropospheric ozone, affecting the concentration levels of the hydroxyl radical, and forming acid precipitation. A sensor system capable of simultaneous measurements of NO and NO2 by using a commercial 76 m astigmatic multi-pass gas cell (MPGC) was developed in order to enable fast-response NOx detection. A continuous wave (CW), distributed-feedback (DFB) quantum cascade laser (QCL) and a CW external-cavity (EC) QCL were employed for targeting a NO absorption doublet at 1900.075 cm-1 and a NO2 absorption line at 1630.33 cm-1, respectively. Both laser beams were combined and transmitted through the MPGC in an identical optical path and subsequently detected by a single mid-infrared detector. A frequency modulation multiplexing scheme was implemented by modulating the DFB-QCL and EC-QCL at different frequencies and demodulating the detector signal with two Labview software based lock-in amplifiers to extract the corresponding second-harmonic (2f) components. Continuous monitoring of NO and NO2 concentration levels was achieved by locking the laser frequencies to the selected absorption lines utilizing a reference cell filled with high concentrations of NO and NO2. The experimental results indicate minor performance degradation associated with frequency modulation multiplexing and no cross talk between the two multiplexed detection channels. The performance of the reported sensor system was evaluated for real time, sensitive and precise detection of NO and NO2 simultaneously.en_US
dc.identifier.citationYu, Yajun, Sanchez, Nancy P., Lou, Minhan, et al.. "CW DFB-QCL and EC-QCL based sensor for simultaneous NO and NO2 measurements via frequency modulation multiplexing using multi-pass absorption spectroscopy." <i>Proceedings of SPIE,</i> 10111, (2017) SPIE: http://dx.doi.org/10.1117/12.2251228.en_US
dc.identifier.doihttp://dx.doi.org/10.1117/12.2251228en_US
dc.identifier.urihttps://hdl.handle.net/1911/93857en_US
dc.language.isoengen_US
dc.publisherSPIEen_US
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.en_US
dc.subject.keywordquantum cascade laseren_US
dc.subject.keywordnitric oxideen_US
dc.subject.keywordnitrogen dioxideen_US
dc.subject.keywordmulti-pass absorptionen_US
dc.subject.keywordwavelength modulation spectroscopyen_US
dc.subject.keywordfrequency modulation multiplexingen_US
dc.subject.keywordtrace gas detectionen_US
dc.subject.keywordlaser sensorsen_US
dc.titleCW DFB-QCL and EC-QCL based sensor for simultaneous NO and NO2 measurements via frequency modulation multiplexing using multi-pass absorption spectroscopyen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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