24 September 2009 Identification of explosive media using spectrum dynamics under the action of a THz pulse
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Abstract
A method of THz spectral dynamics analysis (SDA) of medium response in the THz and GHz ranges, which was developed by us in previous papers for detection and identification of materials, is used for the treatment of experimentally measured signals, passed through selected explosives, including those hidden under covering materials. This technique is based on the window sliding method and on restoration of the THz pulse. It allows researchers to follow the dynamics of many spectral lines in one set of measurements simultaneously and to obtain the full information about the spectrum dynamics of the THz pulse. Relaxation time of rotational transitions, for example, can be determined too. This information gives an opportunity to detect and identify materials despite the similarity in their THz spectra-which may be identical. We show that the spectrum dynamics of THz pulses, passed through the explosives hidden under plastic, cotton and leather barriers-covers, differ widely for these media despite little difference in their spectra. Consequently, our method allows for detection and identification of the hidden explosives with high probability.
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Vyacheslav A. Trofimov, Svetlana A. Varentsova, Jian Chen, Xi-Cheng Zhang, "Identification of explosive media using spectrum dynamics under the action of a THz pulse", Proc. SPIE 7486, Optics and Photonics for Counterterrorism and Crime Fighting V, 74860A (24 September 2009); doi: 10.1117/12.830162; https://doi.org/10.1117/12.830162
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