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Trofimov VA, Varentsova SA. An effective method for substance detection using the broad spectrum THz signal with a "terahertz nose". Sensors (Basel). 2015;15(6):12103-32doi: 10.3390/s150612103.
Trofimov, V. A., & Varentsova, S. A. (2015). An effective method for substance detection using the broad spectrum THz signal with a "terahertz nose". Sensors (Basel, Switzerland), 15(6), 12103-32. https://doi.org/10.3390/s150612103
Trofimov, Vyacheslav A, and Varentsova, Svetlana A. "An effective method for substance detection using the broad spectrum THz signal with a "terahertz nose"." Sensors (Basel, Switzerland) vol. 15,6 (2015): 12103-32. doi: https://doi.org/10.3390/s150612103
Trofimov VA, Varentsova SA. An effective method for substance detection using the broad spectrum THz signal with a "terahertz nose". Sensors (Basel). 2015 May 25;15(6):12103-32. doi: 10.3390/s150612103. PMID: 26020281; PMCID: PMC4507671.
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Sensors (Basel). 2015 May 25;15(6):12103-32. doi: 10.3390/s150612103.

An effective method for substance detection using the broad spectrum THz signal with a "terahertz nose".

Sensors (Basel, Switzerland)

Vyacheslav A Trofimov, Svetlana A Varentsova

Affiliations

  1. Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119992, Russia;. [email protected].
  2. Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119992, Russia;. [email protected].

PMID: 26020281 PMCID: PMC4507671 DOI: 10.3390/s150612103

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.

Keywords: detection and identification of explosives; integral correlation criteria; pulsed Time-Domain Spectroscopy; spectral dynamics analysis method; transmitted and reflected THz pulse with a few cycles

References

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