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New possibilities of substance identification based on THz time domain spectroscopy using a cascade mechanism of high energy level excitation

Sensors (Switzerland), ISSN: 1424-8220, Vol: 17, Issue: 12
2017
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Article Description

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).

Bibliographic Details

Trofimov, Vyacheslav A; Varentsova, Svetlana A; Zakharova, Irina G; Zagursky, Dmitry Yu

MDPI AG

Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy; Engineering

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