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Abstract: Room-Temperature Mid-IR Lasers for On-Line Measurements of Trace Combustion Generated Pollutants

Shawn Wehe, Mark Allen, Xiang Liu, Jay Jeffries, Ronald Hanson, "Room-Temperature Mid-IR Lasers for On-Line Measurements of Trace Combustion Generated Pollutants," presented at IEEE Sensors 2003: The Second IEEE International Conference on Sensors (Sheraton Centre Hotel, Toronto, Canada) , (22-24 October2003).

Article: 1 MB

Copyright © 2003 Institute of Electrical and Electronics Engineers. Reprinted from the proceedings of IEEE Sensors 2003: The Second IEEE International Conference on Sensors (October 2003).

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Abstract

Measurements of NO and CO in combustion exhaust gases are reported using thermo-electrically cooled, mid-IR quantum cascade lasers operating near 5.26 and 4.62 μm respectively. Measurements of NO are performed in an insulated exhaust duct of a C2H4-air flame at temperatures of approximately 600 K. CO measurements are performed above a rich H2-air flame seeded with CO2 and diluted with N2 to 1150 K. Sensitivities on the order of 0.36 ppm-m are achieved in the case of NO and 0.21 ppm-m in the case of CO using a balanced ratiometric detection technique. Comparisons between measured and predicted water-vapor and CO2 interference is discussed.

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