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Proceedings Paper

Standoff chemical detection with parts per million level calibrated detection sensitivity
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Paper Abstract

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.

Paper Details

Date Published: 29 May 2013
PDF: 8 pages
Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 871007 (29 May 2013); doi: 10.1117/12.2016282
Show Author Affiliations
Xing Chen, Univ. of Maryland, Baltimore County (United States)
Fow-Sen Choa, Univ. of Maryland, Baltimore County (United States)
Ellen Holthoff, U.S. Army Research Lab. (United States)
Paul Pellegrino, U.S. Army Research Lab. (United States)
Jenyu Fan, AdTech Optics, Inc. (United States)


Published in SPIE Proceedings Vol. 8710:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV
Augustus Way Fountain, Editor(s)

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