Abstract
We discuss an effective tool for the detection and identification of substances in ternary mixtures with similar spectral properties using a broadband reflected THz signal. Nowadays, this is an urgent problem; its effective solution is still far off. Two ternary mixtures of the explosives (RDX+TNT+HMX and RDX+TNT+PETN) were used as the examples for demonstration of the efficiency of the method proposed. The identification is based on the pulsed THz spectroscopy. We follow the spectral intensities together with the use of integral correlation criteria. They use the spectral line dynamics of the THz pulse reflected from the substance under investigation and that of the standard THz signal from database. In order to increase the accuracy and reliability of the identification, we analyze the partial non-overlapping time intervals, containing the main pulse of the reflected THz signal and the sequential sub-pulses. The main pulse is shown to contain information about high absorption frequencies (ν > 2.6 THz) of the mixture components. In the sub-pulses, the absorption frequencies of the components are detected in the range of low (ν < 2.6 THz) and high (ν > 2.6 THz) frequencies. The opportunity of distinguishing the mixtures with similar spectral properties is also shown.
Highlights
THz3.2 ν (THz) spectroscopy is widely used for the detection and identification of substances, especially for security and anti-terrorism applications
In order to overcome the restrictions of this method, we propose to use the spectral dynamics analysis method (SDA-method) and several integral correlation criteria (ICC) simultaneously
The method discussed does not require a large number of measurements and samples for developing of mixtures is containing their in various
Summary
THz spectroscopy is widely used for the detection and identification of substances, especially for security and anti-terrorism applications. We continue developing of an effective tool for the detection of the components of two ternary mixtures of explosives (RDX+TNT+HMX and RDX+TNT+PETN) with similar spectral properties in THz frequency range under providing measurements in the reflection mode. We show that the main pulse spectrum of the measured THz signal does not have the pronounced absorption frequencies in the THz frequency range ν < 2.6 THz. using of the standard THz-TDS method is inefficient for the detection and identification of the mixture components. The measurements of THz pulses reflected from the mixtures RDX+TNT+HMX and RDX+TNT+PETN were made in the Military University of Technology (Warsaw, Poland) and the investigation of them are described in Reference [39], where the absorption frequencies of all components were found analyzing the first sub-pulse only. In References [43,48], absorption frequencies of these signals were detected by the SDA-method and the first type of the ICC
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