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Proceedings Paper

Detection of chemicals in mixed, two-dimensional Raman spectra
Author(s): David Gillis; Jacob Grun; Jeffrey Bowles; Robert Lunsford; Sergei Nikitin; Charles Manka
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Paper Abstract

Recently, researchers at the Naval Research Laboratory have developed the SWORrD system for measuring two-dimensional Raman Spectra. The device consists of a tunable 2d ultraviolet laser that illuminates the sample at various wavelengths (210-300 nm) and collects a single Raman spectrum at each laser wavelength. The single spectra are combined to form a two-dimensional spectrum (laser wavelength by scattered wavenumber). In this paper we introduce a novel method for the detection of known agents ('targets') within measured 2d spectra. Our method is bases on 'linear mixed pixel' techniques from hyperspectral imagery; in particular, we generalize the Adaptive Subspace Detector (ASD) to a form suitable for SWORrD samples. Our detector uses the individual laser runs to define a set of points within wavenumber space; the set of points corresponding to a 2d spectra defines a particular subspace that contains each material. These subspaces are then used with ASD to identify targets. We include experimental results using real-world data to illustrate our results.

Paper Details

Date Published: 5 May 2010
PDF: 9 pages
Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 76651D (5 May 2010); doi: 10.1117/12.850253
Show Author Affiliations
David Gillis, U.S. Naval Research Lab. (United States)
Jacob Grun, U.S. Naval Research Lab. (United States)
Jeffrey Bowles, U.S. Naval Research Lab. (United States)
Robert Lunsford, Research Support Instruments, Inc. (United States)
Sergei Nikitin, Research Support Instruments, Inc. (United States)
Charles Manka, Research Support Instruments, Inc. (United States)


Published in SPIE Proceedings Vol. 7665:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI
Augustus Way Fountain; Patrick J. Gardner, Editor(s)

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