20 January 2012 Standoff detection of explosives with broad band tunable external cavity quantum cascade lasers
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Abstract
We present standoff detection of various explosives by backscattering spectroscopy, using a sensing system based on mid-IR external-cavity quantum cascade lasers (EC-QCL) with a broad tunable range of about 300 cm-1. Traces of TNT (trinitrotoluene), PETN (pentaerythritol tetranitrate) and RDX (cyclotrimethylenetrinitramine) as well as different nonhazardous substances were investigated by illuminating them with the EC-QC laser and collecting the diffusely backscattered light. Tuning the EC-QCL across the characteristic absorption spectra enables us to detect and identify the explosives against a background of non-hazardous materials.
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F. Fuchs, S. Hugger, M. Kinzer, Q. K. Yang, W. Bronner, R. Aidam, K. Degreif, S. Rademacher, F. Schnürer, W. Schweikert, "Standoff detection of explosives with broad band tunable external cavity quantum cascade lasers", Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 82681N (20 January 2012); doi: 10.1117/12.908119; https://doi.org/10.1117/12.908119
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