Quantum cascade laser-based photoacoustic spectroscopy for trace vapor detection and molecular discrimination.

Authors :: Holthoff E
Bender J
Pellegrino P
Fisher A
Source :: Sensors (Basel, Switzerland) [Sensors (Basel)] 2010; Vol. 10 (3), pp. 1986-2002. Date of Electronic Publication: 2010 Mar 11.
Publication Year :: 2010
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.

Subjects :: Acetic Acid chemistry
Acetone chemistry
Algorithms
Dioxanes chemistry
Gases classification
Least-Squares Analysis
Limit of Detection
Micro-Electrical-Mechanical Systems
Vinyl Compounds chemistry
Gases analysis
Lasers, Semiconductor
Photoacoustic Techniques instrumentation
Photoacoustic Techniques methods
Spectrum Analysis methods

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