Pollutant emission monitoring using QC laser-based mid-IR sensors

David M. Sonnenfroh; Mark G. Allen; W. Terry Rawlins; Claire F. Gmachl; Federico Capasso; Albert L. Hutchinson; Deborah L. Sivco; Alfred Y. Cho

doi:10.1117/12.417364

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14 February 2001 Pollutant emission monitoring using QC laser-based mid-IR sensors

David M. Sonnenfroh, Mark G. Allen, W. Terry Rawlins, Claire F. Gmachl, Federico Capasso, Albert L. Hutchinson, Deborah L. Sivco, Alfred Y. Cho

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Proceedings Volume 4199, Water, Ground, and Air Pollution Monitoring and Remediation; (2001) https://doi.org/10.1117/12.417364
Event: Environmental and Industrial Sensing, 2000, Boston, MA, United States

Abstract

12 Recent advances in mid-IR semiconductor laser technology based on intersubband transitions in InGaAs quantum wells promise a dramatic impact on tunable diode laser-based sensors for trace gases. This paper reports recent progress toward this realization of room-temperature laser-based sensors for combustion-generated pollutants such as NO_x and SO_x. Laboratory measurements of SO₂ at 8.6 micrometers are presented with detection limits on the order of 1 ppm. Extensions of these approaches for higher sensitivity measurements in exhaust gas conditions are described, as well as measurements of SO₃.

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David M. Sonnenfroh, Mark G. Allen, W. Terry Rawlins, Claire F. Gmachl, Federico Capasso, Albert L. Hutchinson, Deborah L. Sivco, and Alfred Y. Cho "Pollutant emission monitoring using QC laser-based mid-IR sensors", Proc. SPIE 4199, Water, Ground, and Air Pollution Monitoring and Remediation, (14 February 2001); https://doi.org/10.1117/12.417364

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