Detection of Chemicals in Mixed, Two-Dimensional Raman Spectra

Abstract

NRL has developed the SWOrRD system for measuring two-dimensional Raman Spectra. The device consists of tunable 2d ultraviolet laser that illuminates the sample at various wavelengths 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 within measured 2d spectra. Our method is based on 'linear mixed pixel' techniques from hyperspectral imagery; in particular, we generalize the Adaptive Subspace Detector (ASD) to a from suitable for the SWOrRD system. Our detector uses the individual laser tune 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.

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Document Details

Document Type
Technical Report
Publication Date
Mar 18, 2010
Accession Number
ADA532201

Entities

People

  • David Gillis
  • Jacob Grün
  • Jeffrey H. Bowles

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acetonitrile
  • Alcohols
  • Algorithms
  • Alkenes
  • Detection
  • Detectors
  • Ethylene Glycol
  • Ethylenes
  • Glycols
  • Image Processing
  • Materials
  • Measurement
  • Military Research
  • Raman Spectra
  • Spectra
  • Target Detection
  • Two Dimensional

Fields of Study

  • Physics

Readers

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  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Solar Physics

Technology Areas

  • Directed Energy
  • Space
  • Space - Space Objects