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