The method of the spectral dynamics analysis of reflected signal for problem of identification of substance

被引：15

作者：

Trofimov, Vyacheslav A. ^{[1
]}

Varentsova, Svetlana A. ^{[1
]}

Palka, Norbert ^{[2
]}

Szustakowski, Mieczyslaw ^{[2
]}

Trzcinski, Tomasz ^{[2
]}

机构：

[1] Lomonosov Moscow State Univ, Moscow 119992, Russia

[2] Mil Univ Technol, Warsaw, Poland

来源：

TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS V: ADVANCE APPLICATIONS IN INDUSTRY AND DEFENSE | 2011年 / 8023卷

基金：

俄罗斯基础研究基金会;

关键词：

reflected THz pulse; method of spectral dynamics analysis; 2D THz signature; detection and identification of substances; explosive; subpulse; SECURITY APPLICATIONS; TERAHERTZ TECHNOLOGY; ILLICIT DRUGS; SPECTROSCOPY; RESTORATION; EXPLOSIVES;

D O I：

10.1117/12.883672

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The method of spectral dynamics analysis (SDA-method) is used for the detection and identification of explosive RDX and harmless substances in pellets with different weight and hidden under the thin layer of polyethylene or cotton by reflected THz signal. The signal was measured on the long-term interval with duration about 180 ps and contains not only the main reflected THz pulse but the subpulse with less intensity. Two cases of the reflection were investigated - at 90 degrees and at 45 degrees from the sample. SDA method allows to obtain the spectrogram - 2D THz signature of the substance, and to analyze the dynamics of many spectral lines of the signal by one set of measurements. The identifiers characterizing the presence of substance in the sample were found in all investigated samples - they contain in the corresponding spectrograms and dynamics of spectral lines. We showed that the analysis of the reflected signal over the short time intervals (less than 50 ps) is insufficient for reliable identification of the substances, especially of hidden ones, because in some cases the characteristic features of the substances can be found only in the subpulses. The influence of window shape in Fourier-Gabor method on the dynamics of spectral lines was discussed too.

引用

页数：12

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