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Room-temperature mid-IR lasers for on-line measurements of trace combustion generated pollutants

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5 Author(s)
Wehe, S. ; Phys. Sci. Inc., Andover, MA, USA ; Allen, Mark ; Xiang Liu ; Jeffries, J.
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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-airflame 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.

Published in:

Sensors, 2003. Proceedings of IEEE  (Volume:2 )

Date of Conference:

22-24 Oct. 2003