A Mid-Infrared Fiber-Coupled QEPAS Nitric Oxide Sensor for Real-Time Engine Exhaust Monitoring
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AbstractWe report the development and application of a compact and sensitive mid-infrared nitric oxide (NO) sensor using off-beam quartz-enhanced photoacoustic spectroscopy (QEPAS). This QEPAS sensor exploits the strong absorption band of NO at 5.2 mu m using a distributed-feedback quantum cascade laser (QCL). The QCL was connected with the custom-designed photoacoustic gas cell with a mid-infrared multimode fiber to form a plug-and-play system. The selection of key sensor parameters, such as micro-resonator, laser modulation depth, and gas pressure, was discussed in detail about improving the detection sensitivity. With a minimum detection limit of 120 ppbv, our QEPAS NO sensor was deployed in real-time diesel-engine exhaust monitoring. We observed the influence of soot existing in the engine exhaust on the sensor performance, which was filtered by a high efficiency particulate arrestance material. Our sensor captured the varied NO concentrations between 126 and 187 ppmv in the exhaust at different engine rotational speeds.
All Author(s) ListShi C., Wang D., Wang Z., Ma L., Wang Q., Xu K., Chen S.C., Ren W.
Journal nameIEEE Sensors Journal
Year2017
Month11
Day15
Volume Number17
Issue Number22
PublisherIEEE
Pages7418 - 7424
ISSN1530-437X
eISSN1558-1748
LanguagesEnglish-United States

Last updated on 2020-18-10 at 02:54