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Sensors 2017, 17(12), 2728; https://doi.org/10.3390/s17122728

New Possibilities of Substance Identification Based on THz Time Domain Spectroscopy Using a Cascade Mechanism of High Energy Level Excitation

1
Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119992, Russia
2
Faculty of Physics, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119992, Russia
*
Author to whom correspondence should be addressed.
Received: 9 October 2017 / Revised: 17 November 2017 / Accepted: 21 November 2017 / Published: 25 November 2017
(This article belongs to the Section Physical Sensors)

Abstract

Using an experiment with thin paper layers and computer simulation, we demonstrate the principal limitations of standard Time Domain Spectroscopy (TDS) based on using a broadband THz pulse for the detection and identification of a substance placed inside a disordered structure. We demonstrate the spectrum broadening of both transmitted and reflected pulses due to the cascade mechanism of the high energy level excitation considering, for example, a three-energy level medium. The pulse spectrum in the range of high frequencies remains undisturbed in the presence of a disordered structure. To avoid false absorption frequencies detection, we apply the spectral dynamics analysis method (SDA-method) together with certain integral correlation criteria (ICC). View Full-Text
Keywords: pulsed THz TDS; disordered structure; pulse with a few-cycles; computer simulation; spectral dynamics analysis method; integral correlation criteria; cascade mechanism; high energy level excitation; substance emission frequencies pulsed THz TDS; disordered structure; pulse with a few-cycles; computer simulation; spectral dynamics analysis method; integral correlation criteria; cascade mechanism; high energy level excitation; substance emission frequencies
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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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Trofimov, V.A.; Varentsova, S.A.; Zakharova, I.G.; Zagursky, D.Y. New Possibilities of Substance Identification Based on THz Time Domain Spectroscopy Using a Cascade Mechanism of High Energy Level Excitation. Sensors 2017, 17, 2728.

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