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Proceedings Paper

Angle-resolved scattering spectroscopy of explosives using an external cavity quantum cascade laser
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Paper Abstract

We present a study of the spectral and angular dependence of the diffuse scatter of mid-infrared (MIR) laser light from explosives residues on surfaces. Experiments were performed using an external cavity quantum cascade laser (ECQCL) tunable between 7 and 8 μm (1270 to 1400 cm-1) for surface illumination. A mercury cadmium telluride (MCT) detector was used to detect backscattered spectra as a function of surface angle at a 2 meter standoff. A ferroelectric focal plane array was used to build hyperspectral images at a 0.5 meter standoff. Residues of RDX, tetryl, and TNT were investigated on surfaces including a painted car door for angles between zero (specular) and 50 degrees. We observe spectral signatures of the explosives in the diffuse scattering geometry which differ significantly from those observed in transmission geometries. Characterization of the scattered light spectra of explosives on surfaces will be essential for understanding the performance of standoff explosives detection instruments and developing robust spectral analysis techniques.

Paper Details

Date Published: 20 January 2012
PDF: 8 pages
Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 82681O (20 January 2012); doi: 10.1117/12.908653
Show Author Affiliations
Jonathan D. Suter, Pacific Northwest National Lab. (United States)
Bruce E. Bernacki, Pacific Northwest National Lab. (United States)
Mark C. Phillips, Pacific Northwest National Lab. (United States)


Published in SPIE Proceedings Vol. 8268:
Quantum Sensing and Nanophotonic Devices IX
Manijeh Razeghi; Eric Tournie; Gail J. Brown, Editor(s)

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