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J.P. Waclawek, R. Lewicki, M. JahJah, Y.F. Ma, Engelene Chrysostom, B. Lendl, F.K. Tittel:
"A sensitive CW DFB quantum cascade laser based QEPAS sensor for detection of SO2";
Talk: CLEO: Applications and Technology, CLEO_AT 2012, San Jose, CA; United States; 05-06-2012 - 05-11-2012; in: "CLEO: Applications and Technology, CLEO_AT 2012", (2012), 2 pages.

This presentation will describe the development of a sensitive, selective and compact sensor platform, capable of detecting and monitoring SO2 at ppbv concentration levels with a time response of 1-sec, suitable for environmental and industrial monitoring. SO2 is a major air pollutant that is mainly released to the atmosphere by industrial combustion processes as well as automobile, truck, aircraft, and marine activities. SO2 becomes toxic when its concentration exceeds 1 ppmv in ambient air [1]. In this work a 7.25 µm, 140 mW CW-DFB QCL operating at 20.5°C was used as a convenient excitation source for a compact quartz-enhanced photoacoustic spectroscopy (QEPAS) based sensor architecture.

Semiconductor lasers, quantum cascade; Spectroscopy, infrared; Optical sensing and sensors; CW DFB-QCL; QEPAS; SO2