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Proceedings Paper

Detection of acrolein and acrylonitrile with a pulsed room temperature quantum cascade laser
Author(s): J. Manne; W. Jäger; J. Tulip
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Paper Abstract

We investigated the use of a pulsed, distributed feedback quantum cascade laser centered at 957 cm-1 in combination with an astigmatic Herriot cell with 250 m path length for the detection of acrolein and acrylonitrile. These molecules have been identified as hazardous air-pollutants because of their adverse health effects. The spectrometer utilizes the intra-pulse method, where a linear frequency down-chirp, that is induced when a top-hat current pulse is applied to the laser, is used for sweeping across the absorption line. Up to 450 ns long pulses were used for these measurements which resulted in a spectral window of ~2.2 cm-1. A room temperature mercury-cadmium-telluride detector was used, resulting in a completely cryogen free spectrometer. We demonstrated detection limits of ~3 ppb for acrylonitrile and ~6 ppb for acrolein with ~10 s averaging time. Laser characterization and optimization of the operational parameters for sensitivity improvement are discussed.

Paper Details

Date Published: 23 September 2010
PDF: 8 pages
Proc. SPIE 7750, Photonics North 2010, 77500V (23 September 2010); doi: 10.1117/12.876718
Show Author Affiliations
J. Manne, Univ. of Alberta (Canada)
W. Jäger, Univ. of Alberta (Canada)
J. Tulip, Univ. of Alberta (Canada)


Published in SPIE Proceedings Vol. 7750:
Photonics North 2010

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