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Sensors 2016, 16(3), 352; doi:10.3390/s16030352

Laser Feedback Interferometry as a Tool for Analysis of Granular Materials at Terahertz Frequencies: Towards Imaging and Identification of Plastic Explosives

1
School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane QLD 4072, Australia
2
School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
3
School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
4
School of Mathematics and Physics, The University of Queensland, Brisbane QLD 4072, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 15 January 2016 / Revised: 22 February 2016 / Accepted: 4 March 2016 / Published: 9 March 2016
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
View Full-Text   |   Download PDF [2397 KB, uploaded 9 March 2016]   |  

Abstract

We propose a self-consistent method for the analysis of granular materials at terahertz (THz) frequencies using a quantum cascade laser. The method is designed for signals acquired from a laser feedback interferometer, and applied to non-contact reflection-mode sensing. Our technique is demonstrated using three plastic explosives, achieving good agreement with reference measurements obtained by THz time-domain spectroscopy in transmission geometry. The technique described in this study is readily scalable: replacing a single laser with a small laser array, with individual lasers operating at different frequencies will enable unambiguous identification of select materials. This paves the way towards non-contact, reflection-mode analysis and identification of granular materials at THz frequencies using quantum cascade lasers. View Full-Text
Keywords: terahertz imaging; interferometry; semiconductor lasers, quantum cascade; optical constants terahertz imaging; interferometry; semiconductor lasers, quantum cascade; optical constants
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Han, S.; Bertling, K.; Dean, P.; Keeley, J.; Burnett, A.D.; Lim, Y.L.; Khanna, S.P.; Valavanis, A.; Linfield, E.H.; Davies, A.G.; Indjin, D.; Taimre, T.; Rakić, A.D. Laser Feedback Interferometry as a Tool for Analysis of Granular Materials at Terahertz Frequencies: Towards Imaging and Identification of Plastic Explosives. Sensors 2016, 16, 352.

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