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Proceedings Paper

The fusion of MIR absorbance and NIR Raman spectroscopic techniques for identification of improvised explosive materials in multiple scenarios
Author(s): Robert J. Stokes; Erwan L. Normand; Ruth Lindley; Paul Black; Michael McCulloch; David N. Middleton; W. Ewen Smith; Brian Foulger; Colin Lewis
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Paper Abstract

We demonstrate how molecular spectroscopy methods using NIR and MIR lasers can provide rapid detection and identification of many threat materials. It is increasingly recognised that one spectroscopic method will not be suited to every target in every scenario, both in terms of spectroscopic selectivity and the context e.g. vapour phase or within a sealed container. The orthogonal selection rules and capabilities of IR and Raman in combination allow the identification of a very broad range of targets, both in liquid and vapour phase. Therefore, we introduce the benefits of the combining infra-red absorbance based on Quantum Cascade lasers (QC-IR) and NIR Raman spectroscopy for nitrogenous and peroxide based materials. Rapid scan rates up to 10Hz for QC-IR and Raman and are demonstrated using current technology. However, understanding of the chemistry and spectroscopic signatures behind such materials is necessary for accurate fast fitting algorithms to benefit of the full advantage with advances in hardware. This is especially true as future users requirements move towards rapid multiplexed analysis and data fusion from a variety of sensors.

Paper Details

Date Published: 24 September 2009
PDF: 12 pages
Proc. SPIE 7486, Optics and Photonics for Counterterrorism and Crime Fighting V, 74860O (24 September 2009); doi: 10.1117/12.830348
Show Author Affiliations
Robert J. Stokes, Cascade Technologies Ltd. (United Kingdom)
Univ. of Strathclyde (United Kingdom)
Erwan L. Normand, Cascade Technologies Ltd. (United Kingdom)
Ruth Lindley, Cascade Technologies Ltd. (United Kingdom)
Paul Black, Cascade Technologies Ltd. (United Kingdom)
Michael McCulloch, Cascade Technologies Ltd. (United Kingdom)
David N. Middleton, Cascade Technologies Ltd. (United Kingdom)
W. Ewen Smith, Univ. of Strathclyde (United Kingdom)
Brian Foulger, Ministry of Defence (United Kingdom)
Colin Lewis, Ministry of Defence (United Kingdom)

Published in SPIE Proceedings Vol. 7486:
Optics and Photonics for Counterterrorism and Crime Fighting V
Colin Lewis, Editor(s)

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