22 September 2010 Detection of acrolein and acrylonitrile with a pulsed room temperature quantum cascade laser
Author Affiliations +
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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Manne, J. Manne, W. Jäger, W. Jäger, J. Tulip, 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); doi: 10.1117/12.876718; https://doi.org/10.1117/12.876718
PROCEEDINGS
8 PAGES


SHARE
Back to Top