Detection of acrolein and acrylonitrile with a pulsed room temperature quantum cascade laser

J. Manne; W. Jäger; J. Tulip

doi:10.1117/12.876718

22 September 2010 Detection of acrolein and acrylonitrile with a pulsed room temperature quantum cascade laser

J. Manne, W. Jäger, J. Tulip

Proceedings Volume 7750, Photonics North 2010; 77500V (2010) https://doi.org/10.1117/12.876718
Event: Photonics North 2010, 2010, Niagara Falls, Canada

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.

Citation Download Citation

J. Manne, W. Jäger, and J. Tulip "Detection of acrolein and acrylonitrile with a pulsed room temperature quantum cascade laser", Proc. SPIE 7750, Photonics North 2010, 77500V (22 September 2010); https://doi.org/10.1117/12.876718

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