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Sensors 2016, 16(4), 502; doi:10.3390/s16040502

Essential Limitations of the Standard THz TDS Method for Substance Detection and Identification and a Way of Overcoming Them

Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119992, Russia
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Author to whom correspondence should be addressed.
Academic Editors: Vincenzo Spagnolo and Dragan Indjin
Received: 31 January 2016 / Revised: 26 March 2016 / Accepted: 29 March 2016 / Published: 8 April 2016
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
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Abstract

Low efficiency of the standard THz TDS method of the detection and identification of substances based on a comparison of the spectrum for the signal under investigation with a standard signal spectrum is demonstrated using the physical experiments conducted under real conditions with a thick paper bag as well as with Si-based semiconductors under laboratory conditions. In fact, standard THz spectroscopy leads to false detection of hazardous substances in neutral samples, which do not contain them. This disadvantage of the THz TDS method can be overcome by using time-dependent THz pulse spectrum analysis. For a quality assessment of the standard substance spectral features presence in the signal under analysis, one may use time-dependent integral correlation criteria. View Full-Text
Keywords: transmitted or reflected THz pulse with a few cycles; pulsed Time-Domain Spectroscopy; spectral dynamics analysis method; detection and identification of substances; integral correlation criteria transmitted or reflected THz pulse with a few cycles; pulsed Time-Domain Spectroscopy; spectral dynamics analysis method; detection and identification of substances; integral correlation criteria
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Trofimov, V.A.; Varentsova, S.A. Essential Limitations of the Standard THz TDS Method for Substance Detection and Identification and a Way of Overcoming Them. Sensors 2016, 16, 502.

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