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Proceedings Paper

Hyperspectral imaging using novel LWIR OPO for hazardous material detection and identification
Author(s): Keith Ruxton; Gordon Robertson; Bill Miller; Graeme P. A. Malcolm; Gareth T. Maker
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Paper Abstract

Current stand-off hyperspectral imaging detection solutions that operate in the mid-wave infrared (MWIR), nominally 2.5 – 5 μm spectral region, are limited by the number of absorption bands that can be addressed. This issue is most apparent when evaluating a scene with multiple absorbers with overlapping spectral features making accurate material identification challenging. This limitation can be overcome by moving to the long wave IR (LWIR) region, which is rich in characteristic absorption features, which can provide ample molecular information in order to perform presumptive identification relative to a spectral library. This work utilises an instrument platform to perform negative contrast imaging using a novel LWIR optical parametric oscillator (OPO) as the source. The OPO offers continuous tuning in the region 5.5 – 9.5 μm, which includes a number of molecular vibrations associated with the target material compositions. Scanning the scene of interest whilst sweeping the wavelength of the OPO emission will highlight the presence of a suspect material and by analysing the resulting absorption spectrum, presumptive identification is possible. This work presents a selection of initial results using the LWIR hyperspectral imaging platform on a range of white powder materials to highlight the benefit operating in the LWIR region compared to the MWIR.

Paper Details

Date Published: 10 June 2014
PDF: 7 pages
Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 90730L (10 June 2014); doi: 10.1117/12.2050560
Show Author Affiliations
Keith Ruxton, M Squared Lasers Ltd. (United Kingdom)
Gordon Robertson, M Squared Lasers Ltd. (United Kingdom)
Bill Miller, M Squared Lasers Ltd. (United Kingdom)
Graeme P. A. Malcolm, M Squared Lasers Ltd. (United Kingdom)
Gareth T. Maker, M Squared Lasers Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 9073:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV
Augustus Way Fountain III, Editor(s)

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