Coded-aperture Raman imaging for standoff explosive detection

Scott T. McCain, B. D. Guenther, David J. Brady, Kalyani Krishnamurthy, Rebecca Willett

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII
PublisherSPIE
ISBN (Print)9780819490360
DOIs
StatePublished - 2012
Externally publishedYes
EventChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII - Baltimore, MD, United States
Duration: Apr 24 2012Apr 27 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8358
ISSN (Print)0277-786X

Conference

ConferenceChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII
Country/TerritoryUnited States
CityBaltimore, MD
Period4/24/124/27/12

Keywords

  • Coded aperture
  • Explosive detection
  • Raman,spectrometer
  • Spectral Imager

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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