5 May 2010 Photoacoustic spectroscopy for trace vapor detection and molecular discrimination
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Photoacoustic spectroscopy (PAS) is a useful monitoring technique that is well suited for trace gas detection. This method routinely exhibits detection limits at the parts-per-million (ppm) or parts-per-billion (ppb) level for gaseous samples. PAS also possesses favorable detection characteristics when the system dimensions are scaled to a microsystem design. Current research utilizes quantum cascade lasers (QCLs) in combination with micro-electromechanical systems (MEMS)-scale photoacoustic cell designs. This sensing platform has provided favorable detection limits for a standard nerve agent simulant. The objective of the present work is to demonstrate an extremely versatile MEMS-scale photoacoustic sensor system that is able to discriminate between different analytes of interest.
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Ellen Holthoff, Ellen Holthoff, John Bender, John Bender, Paul Pellegrino, Paul Pellegrino, Almon Fisher, Almon Fisher, Nancy Stoffel, Nancy Stoffel, } "Photoacoustic spectroscopy for trace vapor detection and molecular discrimination", Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 766510 (5 May 2010); doi: 10.1117/12.850118; https://doi.org/10.1117/12.850118

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