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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