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14 February 2001 Pollutant emission monitoring using QC laser-based mid-IR sensors
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Proceedings Volume 4199, Water, Ground, and Air Pollution Monitoring and Remediation; (2001)
Event: Environmental and Industrial Sensing, 2000, Boston, MA, United States
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 NOx and SOx. 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.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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