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Proceedings Paper

Mid-wave infrared hyperspectral imaging of unknown chemical warfare agents
Author(s): Rhea J. Clewes; Chris R. Howle; Jason Guicheteau; Darren Emge; Keith Ruxton; Gordon Robertson; William Miller; Graeme Malcolm; Gareth T. Maker
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Paper Abstract

The ability of a stand-off chemical detector to distinguish two different chemical warfare agents is demonstrated in this paper. Using Negative Contrast Imaging, based upon IR absorption spectroscopy, we were able to detect 1 μl of VX, sulfur mustard and water on a subset of representative surfaces. These experiments were performed at a range of 1.3 metres and an angle of 45° to the surface. The technique employed utilises a Q-switched intracavity MgO:PPLN crystal that generated 1.4 – 1.8 μm (shortwave) and 2.6 – 3.6 μm (midwave) infrared radiation (SWIR and MWIR, respectively). The MgO:PPLN crystal has a fanned grating design which, via translation through a 1064 nm pump beam, enables tuning through the SWIR and MWIR wavelength ranges. The SWIR and MWIR beams are guided across a scene via a pair of raster scanned mirrors allowing detection of absorption features within these spectral regions. This investigation exploited MWIR signatures, as they provided sufficient molecular information to distinguish between toxic and benign chemicals in these proof-of-concept experiments.

Paper Details

Date Published: 29 May 2013
PDF: 9 pages
Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 871002 (29 May 2013); doi: 10.1117/12.2017868
Show Author Affiliations
Rhea J. Clewes, Defence Science and Technology Lab. (United Kingdom)
Chris R. Howle, Defence Science and Technology Lab. (United Kingdom)
Jason Guicheteau, Edgewood Chemical and Biological Ctr. (United States)
Darren Emge, Edgewood Chemical and Biological Ctr. (United States)
Keith Ruxton, M Squared Lasers Ltd. (United Kingdom)
Gordon Robertson, M Squared Lasers Ltd. (United Kingdom)
William Miller, M Squared Lasers Ltd. (United Kingdom)
Graeme Malcolm, M Squared Lasers Ltd. (United Kingdom)
Gareth T. Maker, M Squared Lasers Ltd. (United Kingdom)


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

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