29 May 2013 Standoff chemical detection with parts per million level calibrated detection sensitivity
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This work relates to standoff detection of nerve agent simulant using mid-infrared quantum cascade lasers (QCL) and photoacoustic technique. In our experiment, a mid-IR QCL with an emission wavelength near ~7.35 μm was operated under pulsed conditions. Gas phase nerve agent simulant was generated and calibrated using a vapor generator. The QCL output beam with average output power ~150 mW was focused on the gaseous sample in open-air environment. Photoacoustic signals were generated and detected by an ultra-sensitive microphone. With the help of a parabolic sound reflector, standoff detection of gas samples with calibrated concentration of 2.3 ppm was achieved at a detection distance of more than 2 feet. An extended detection distance up to 14 feet was observed for a higher gas concentration of 13.9 ppm.
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Xing Chen, Xing Chen, Fow-Sen Choa, Fow-Sen Choa, Ellen Holthoff, Ellen Holthoff, Paul Pellegrino, Paul Pellegrino, Jenyu Fan, Jenyu Fan, "Standoff chemical detection with parts per million level calibrated detection sensitivity", Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 871007 (29 May 2013); doi: 10.1117/12.2016282; https://doi.org/10.1117/12.2016282

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