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Proceedings Paper

Coded-aperture Raman imaging for standoff explosive detection
Author(s): Scott T. McCain; B. D. Guenther; David J. Brady; Kalyani Krishnamurthy; Rebecca Willett
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Paper Abstract

This paper describes the design of a deep-UV Raman imaging spectrometer operating with an excitation wavelength of 228 nm. The designed system will provide the ability to detect explosives (both traditional military explosives and home-made explosives) from standoff distances of 1-10 meters with an interrogation area of 1 mm x 1 mm to 200 mm x 200 mm. This excitation wavelength provides resonant enhancement of many common explosives, no background fluorescence, and an enhanced cross-section due to the inverse wavelength scaling of Raman scattering. A coded-aperture spectrograph combined with compressive imaging algorithms will allow for wide-area interrogation with fast acquisition rates. Coded-aperture spectral imaging exploits the compressibility of hyperspectral data-cubes to greatly reduce the amount of acquired data needed to interrogate an area. The resultant systems are able to cover wider areas much faster than traditional push-broom and tunable filter systems. The full system design will be presented along with initial data from the instrument. Estimates for area scanning rates and chemical sensitivity will be presented. The system components include a solid-state deep-UV laser operating at 228 nm, a spectrograph consisting of well-corrected refractive imaging optics and a reflective grating, an intensified solar-blind CCD camera, and a high-efficiency collection optic.

Paper Details

Date Published: 4 May 2012
PDF: 9 pages
Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 83580Q (4 May 2012); doi: 10.1117/12.919292
Show Author Affiliations
Scott T. McCain, Applied Quantum Technologies, Inc. (United States)
B. D. Guenther, Applied Quantum Technologies, Inc. (United States)
David J. Brady, Duke Univ. (United States)
Kalyani Krishnamurthy, Duke Univ. (United States)
Rebecca Willett, Duke Univ. (United States)

Published in SPIE Proceedings Vol. 8358:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII
Augustus Way Fountain, Editor(s)

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