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Sensors 2017, 17(12), 2883; https://doi.org/10.3390/s17122883

The Anomalous Influence of Spectral Resolution on Pulsed THz Time Domain Spectroscopy under Real Conditions

Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119992, Russia
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Received: 19 October 2017 / Revised: 3 December 2017 / Accepted: 5 December 2017 / Published: 12 December 2017
(This article belongs to the Section Physical Sensors)

Abstract

We have studied the spectral resolution influence on the accuracy of the substance detection and identification at using a broadband THz pulse measured under real conditions (at a distance of more than 3 m from a THz emitter in ambient air with a relative humidity of about 50%). We show that increasing spectral resolution leads to manifestation of small-scale perturbations (random fluctuations) in the signal spectrum caused by the influence of the environment or the sample structure. Decreasing the spectral resolution allows us to exclude from consideration this small-scale modulation of the signal as well as to detect the water vapor absorption frequencies. This fact is important in practice because it allows us to increase the signal processing rate. In order to increase the detection reliability, it is advisable to decrease the spectral resolution up to values of not more than 40% of the corresponding spectral line bandwidth. The method of spectral dynamics analysis together with the integral correlation criteria is used for the substance detection and identification. Neutral substances such as chocolate and cookies are used as the samples in the physical experiment. View Full-Text
Keywords: pulsed THz time-domain spectroscopy; spectral dynamics analysis method (SDA-method); detection and identification of substances; integral correlation criteria; spectral resolution pulsed THz time-domain spectroscopy; spectral dynamics analysis method (SDA-method); detection and identification of substances; integral correlation criteria; spectral resolution
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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. The Anomalous Influence of Spectral Resolution on Pulsed THz Time Domain Spectroscopy under Real Conditions. Sensors 2017, 17, 2883.

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