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Merck

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

Sensors (Basel, Switzerland) (2010-01-01)
Ellen Holthoff, John Bender, Paul Pellegrino, Almon Fisher
ABSTRAKT

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.

MATERIAŁY
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Opis produktu

Supelco
Vinyl acetate solution, certified reference material, 5000 μg/mL in acetonitrile
Sigma-Aldrich
Vinyl acetate, contains 3-20 ppm hydroquinone as inhibitor, ≥99%
Supelco
Vinyl acetate, analytical standard
Vinyl acetate, European Pharmacopoeia (EP) Reference Standard