The fusion of MIR absorbance and NIR Raman spectroscopic techniques for identification of improvised explosive materials in multiple scenarios

Robert J. Stokes; Erwan L. Normand; Ruth Lindley; Paul Black; Michael McCulloch; David N. Middleton; W. Ewen Smith; Brian Foulger; Colin Lewis

doi:10.1117/12.830348

24 September 2009 The fusion of MIR absorbance and NIR Raman spectroscopic techniques for identification of improvised explosive materials in multiple scenarios

Robert J. Stokes, Erwan L. Normand, Ruth Lindley, Paul Black, Michael McCulloch, David N. Middleton, W. Ewen Smith, Brian Foulger, Colin Lewis

Author Affiliations +

Proceedings Volume 7486, Optics and Photonics for Counterterrorism and Crime Fighting V; 74860O (2009) https://doi.org/10.1117/12.830348
Event: SPIE Security + Defence, 2009, Berlin, Germany

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.

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Robert J. Stokes, Erwan L. Normand, Ruth Lindley, Paul Black, Michael McCulloch, David N. Middleton, W. Ewen Smith, Brian Foulger, and Colin Lewis "The fusion of MIR absorbance and NIR Raman spectroscopic techniques for identification of improvised explosive materials in multiple scenarios", Proc. SPIE 7486, Optics and Photonics for Counterterrorism and Crime Fighting V, 74860O (24 September 2009); https://doi.org/10.1117/12.830348

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