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Sensors 2015, 15(6), 12103-12132; doi:10.3390/s150612103

An Effective Method for Substance Detection Using the Broad Spectrum THz Signal: A "Terahertz Nose"

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 Editor: Vittorio M.N. Passaro
Received: 2 April 2015 / Accepted: 14 May 2015 / Published: 25 May 2015
(This article belongs to the Section Physical Sensors)

Abstract

We propose an effective method for the detection and identification of dangerous substances by using the broadband THz pulse. This pulse excites, for example, many vibrational or rotational energy levels of molecules simultaneously. By analyzing the time-dependent spectrum of the THz pulse transmitted through or reflected from a substance, we follow the average response spectrum dynamics. Comparing the absorption and emission spectrum dynamics of a substance under analysis with the corresponding data for a standard substance, one can detect and identify the substance under real conditions taking into account the influence of packing material, water vapor and substance surface. For quality assessment of the standard substance detection in the signal under analysis, we propose time-dependent integral correlation criteria. Restrictions of usually used detection and identification methods, based on a comparison between the absorption frequencies of a substance under analysis and a standard substance, are demonstrated using a physical experiment with paper napkins. View Full-Text
Keywords: transmitted and reflected THz pulse with a few cycles; pulsed Time-Domain Spectroscopy; spectral dynamics analysis method; detection and identification of explosives; integral correlation criteria transmitted and reflected THz pulse with a few cycles; pulsed Time-Domain Spectroscopy; spectral dynamics analysis method; detection and identification of explosives; integral correlation criteria
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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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MDPI and ACS Style

Trofimov, V.A.; Varentsova, S.A. An Effective Method for Substance Detection Using the Broad Spectrum THz Signal: A "Terahertz Nose". Sensors 2015, 15, 12103-12132.

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