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Proceedings Paper

Stand off spatial offset Raman spectroscopy: a distant look behind the scenes
Author(s): Bernhard Zachhuber; Christoph Gasser; Alison J Hobro; Engelene t. H. Chrysostom; Bernhard Lendl
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Paper Abstract

A pulsed (4.4 ns pulse length) frequency doubled Nd:YAG laser, operating at 10 Hz, was used to generate Raman scattering from samples at a distance of 12 m. The scattered light was collected by a 6 inch telescope and the Raman spectrum recorded using an Acton SP-2750 spectrograph coupled to a gated ICCD detector. To extend the potential applications further, employing a spatial offset between the point where the laser hit the sample and the focus of the telescope on the sample, enabled collection of Raman photons that were predominantly generated inside the sample and not from its surface. This is especially effective when the content of concealed objects should be analysed. Raman spectra of H2O2 in a 1.5 mm thick, fluorescent HDPE plastic bottle were recorded at a distance of 12 m. From the recorded spectra it was possible to determine the H2O2 concentration in the concentration range from 2-30%. Stand-off Raman spectra of eleven potentially dangerous chemicals (commercial and improvised explosives) were recorded at a distance of 100 m.

Paper Details

Date Published: 13 October 2011
PDF: 8 pages
Proc. SPIE 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security, 818904 (13 October 2011); doi: 10.1117/12.899383
Show Author Affiliations
Bernhard Zachhuber, Vienna Univ. of Technology (Austria)
Christoph Gasser, Vienna Univ. of Technology (Austria)
Alison J Hobro, Vienna Univ. of Technology (Austria)
Engelene t. H. Chrysostom, Vienna Univ. of Technology (Austria)
Bernhard Lendl, Vienna Univ. of Technology (Austria)


Published in SPIE Proceedings Vol. 8189:
Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security
Roberto Zamboni; François Kajzar; Attila A. Szep; Mark T. Gruneisen; Miloslav Dusek; John G. Rarity; Colin Lewis; Douglas Burgess, Editor(s)

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