Photoacoustic spectroscopy for trace vapor detection and molecular discrimination
2010
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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