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Permanent link (DOI): https://doi.org/10.7939/R3MM8P

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Continuous wave terahertz frequency spectroscopy and imaging for explosives detection and security screenings Open Access

Descriptions

Other title
Subject/Keyword
terahertz
spectroscopy
explosives
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Startsev, Michael Andrei
Supervisor and department
Examining committee member and department
Dr. Ray DeCorby (Electrical and Computer Engineering)
Dr. Wolfgang Jaeger (Chemistry)
Department
Department of Electrical and Computer Engineering
Specialization

Date accepted
2011-09-29T03:38:19Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
Continuous-wave terahertz (THz) spectroscopy was performed on high explosive materials using the Firefly-THz optical parametric oscillator (OPO). Cyclotetramethylene-tetranitramine (HMX), cyclotrimethylene-trinitramine (RDX), pentaerythritol-tetranitrate (PETN) and Composition-4 were scanned under experimental conditions modeling “real world” security screenings. Spectroscopy of RDX yielded broad spectral signatures at 0.83, 1.04, and 1.50 THz. HMX and PETN displayed singular spectral peaks of 1.45 and 1.78 THz, respectively. The OPO’s viability for use as a security system was further evaluated through demonstrations of concealed explosive spectroscopy, and raster scan imaging. A lamellar mirror interferometer was designed and constructed to investigate the system’s frequency range limitations. The interferometric scans concluded that, using Golay cell detection methods, the system could utilize coherent radiation between 0.75 and 1.8 THz. Lastly, a prototype external camera circuit was designed to further the development of a THz frequency camera system capable of both imaging and spectroscopy simultaneously.
Language
English
DOI
doi:10.7939/R3MM8P
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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