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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).
Highlights
The detection and identification of hazardous chemical, biological and other substances by using remote sensing is one of the main current security problems
One of the ways to achieve this aim is by applying THz Time Domain Spectroscopy (TDS) because the THz radiation is non-ionizing and most common substances are transparent to it
In [29,30] we introduced the following definition for using the integral correlation criteria (ICC): the frequency ν is detected in the signal under investigation, if the corresponding ICC calculated for the pair (ν, ν1 ) lies above all other ICC in the frequency detection range (FDR)
Summary
The detection and identification of hazardous chemical, biological and other substances by using remote sensing is one of the main current security problems. In the current paper we show the spectral dynamics analysis method (SDA-method) efficiency and integral correlation criteria (ICC) ([29,30,31,33,34,35,36,37]) using for the detection and identification of a substance covered by such a disordered structure. This allows us to demonstrate a good chance to overcome the standard THz TDS method limitations. We note that the interaction of a THz pulse with a disordered layered structure was partly discussed in [34,37]
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