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

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

1,* , 1
, 1
 and 2
Received: 1 February 2010; in revised form: 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.
Keywords: photoacoustic spectroscopy; sensor; quantum cascade laser; MEMS; chemometrics photoacoustic spectroscopy; sensor; quantum cascade laser; MEMS; chemometrics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

AMA 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(3):1986-2002.

Chicago/Turabian Style

Holthoff, Ellen; Bender, John; Pellegrino, Paul; Fisher, Almon. 2010. "Quantum Cascade Laser-Based Photoacoustic Spectroscopy for Trace Vapor Detection and Molecular Discrimination." Sensors 10, no. 3: 1986-2002.


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