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Sensors 2010, 10(3), 1986-2002; doi:10.3390/s100301986

Quantum Cascade Laser-Based Photoacoustic Spectroscopy for Trace Vapor Detection and Molecular Discrimination

1
United States Army Research Laboratory, RDRL-SEE-O, 2800 Powder Mill Road, Adelphi, MD 20783, USA
2
Infotonics Technology Center, 5450 Campus Drive, Canandaigua, NY 14424, USA
*
Author to whom correspondence should be addressed.
Received: 1 February 2010 / Revised: 12 February 2010 / Accepted: 28 February 2010 / Published: 11 March 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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Abstract

We report on the development of a microelectromechanical systems (MEMS)-scale photoacoustic sensor for the detection of trace gases. A mid-infrared quantum cascade laser (QCL) was used to determine detection limits for acetic acid, acetone, 1,4-dioxane, and vinyl acetate. The source was continuously tunable from 1015 cm-1 to 1240 cm-1, allowing for the collection of photoacoustic vibrational spectra for these gases. Exceptional agreement between the measured photoacoustic spectra and the infrared spectra for acetic acid, acetone, 1,4-dioxane, and vinyl acetate was observed. Partial least-squares (PLS) regression was used to develop an algorithm for classification of these compounds based solely on photoacoustic spectra. View Full-Text
Keywords: photoacoustic spectroscopy; sensor; quantum cascade laser; MEMS; chemometrics photoacoustic spectroscopy; sensor; quantum cascade laser; MEMS; chemometrics
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MDPI and ACS Style

Holthoff, E.; Bender, J.; Pellegrino, P.; Fisher, A. Quantum Cascade Laser-Based Photoacoustic Spectroscopy for Trace Vapor Detection and Molecular Discrimination. Sensors 2010, 10, 1986-2002.

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