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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 4 — Feb. 1, 2013
  • pp: B10–B19

Influence of metal substrates on the detection of explosive residues with laser-induced breakdown spectroscopy

Jennifer L. Gottfried  »View Author Affiliations


Applied Optics, Vol. 52, Issue 4, pp. B10-B19 (2013)
http://dx.doi.org/10.1364/AO.52.000B10


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Abstract

Laser-induced breakdown spectroscopy is a promising approach for explosive residue detection, but several limitations to its widespread use remain. One issue is that the emission spectra of the residues are dependent on the substrate composition because some of the substrate is usually entrained in the laser-induced plasma and the laser–material interaction can be significantly affected by the substrate type. Here, we have demonstrated that despite the strong spectral variation in cyclotrimethylenetrinitramine (RDX) residues applied to various metal substrates, classification of the RDX residue independent of substrate type is feasible. Several approaches to improving the chemometric models based on partial least squares discriminant analysis (PLS-DA) have been described: classifying the RDX residue spectra together in one class independent of substrate, using selected emission intensities and ratios to increase the true positive rate (TPR) and decrease the false positive rate (FPR), and fusing the results from two PLS-DA models generated using the full broadband spectra and selected intensities and ratios. The combination of these approaches resulted in a TPR of 97.5% and a FPR of 1.0% for RDX classification on metal substrates.

OCIS Codes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.3420) Remote sensing and sensors : Laser sensors
(280.1545) Remote sensing and sensors : Chemical analysis
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

History
Original Manuscript: August 14, 2012
Manuscript Accepted: September 5, 2012
Published: October 18, 2012

Citation
Jennifer L. Gottfried, "Influence of metal substrates on the detection of explosive residues with laser-induced breakdown spectroscopy," Appl. Opt. 52, B10-B19 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-4-B10

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