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Standoff detection of explosives with broad band tunable external cavity quantum cascade lasers
: Fuchs, F.; Hugger, S.; Kinzer, M.; Yang, Q.K.; Bronner, W.; Aidam, R.; Degreif, K.; Rademacher, S.; Schnürer, F.; Schweikert, W.
|Razeghi, M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:|
Quantum Sensin and Nanophotonic Devices IX : 22-26 January 2012, San Francisco, USA
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8268)
|Conference "Quantum Sensing and Nanophotonic Devices" <9, 2012, San Francisco/Calif.>|
|Fraunhofer IPM ()|
Fraunhofer IAF ()
Fraunhofer ICT ()
| explosives detection; external-cavity quantum cascade lasers (EC-QCL)|
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.