METHOD OF EXPLOSIVE DETECTION AND IDENTIFICATION

摘要

This invention relates to the explosives detection techniques, in particular, to the methods of the detection of explosives in various closed spaces and on the human body at the locations, where crowds of people gather. The technical result lies in the creation of a simple and reliable explosives detection and identification method, which allows using it in mobile devices intended for use at the locations, where crowds of people gather, and in various closed spaces. The explosives detection and identification method includes the exposure of the object being checked with a pulse UHF signal in the frequency range from 300 MHz to 150 GHz with the duration of the outgoing pulses not exceeding 10 ms, reception of the signal reflected from the object being checked, amplification and analog-digital conversion of the received signal, measurement of the phase shift value of the received signal vs. the emitted signal and its intensity, the value of which is used to determine the absorption ratio of the object being checked, comparison of the measured phase shift value of the received signal vs. the emitted signal with the reference phase shift values recorded in advance, which correspond to the dielectric properties of the inclusions of certain types of the explosives. The results of the comparison, taking into account the identified absorption ratio of the object being checked are used to determine the presence of an explosive and its type. To expose the object being checked, a pulse UHF signal is generated in the form of a pulse burst sequence with the carrier frequency of every subsequent pulse burst differing from the carrier frequency of the previous pulse burst by a preset value.