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Stand-off detection of explosives particles by multispectral imaging Raman spectroscopy
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Metrology and Optics.
2011 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 50, no 28, 5592-5599 p.Article in journal (Refereed) Published
Abstract [en]

A Raman multispectral imaging technique is presented, which can be used for stand-off detection of single explosives particles. A frequency-doubled Nd:YAG laser operating at 10 Hz illuminates the surface under investigation. The backscattered Raman signal is collected by a receiver subsystem consisting of a 150 mm Schmidt-Cassegrain telescope, a laser line edge filter, a liquid-crystal tunable filter, and a gated intensified charge-coupled device (ICCD) detector. A sequence of images is recorded by the ICCD, where, for each recording, a different wavelength is selected by the tunable filter. By this, a Raman spectrum is recorded for each pixel, which makes it possible to detect even single particles when compared to known spectra for possible explosives. The comparison is made using correlation and least-square fitting. The system is relatively insensitive to environment and light variations. Multispectral Raman images of sulfur, ammonium nitrate, 2,4-dinitrotoluene, and 2,4,6-trinitrotoluene were acquired at a stand-off distance of 10 m. Detection of sulfur particles was done at a distance of 10 m.

Place, publisher, year, edition, pages
2011. Vol. 50, no 28, 5592-5599 p.
Keyword [en]
UV, ENVIRONMENT, RESIDUES, SYSTEMS, RDX
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-47989DOI: 10.1364/AO.50.005592ISI: 000295842600050Scopus ID: 2-s2.0-80053404678OAI: oai:DiVA.org:kth-47989DiVA: diva2:456904
Note
QC 20111116Available from: 2011-11-16 Created: 2011-11-15 Last updated: 2017-12-08Bibliographically approved

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CiteExportLink to record
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