METHOD FOR REMOTE DETECTION OF A SUBSTANCE Russian patent published in 2007 - IPC G01R33/20 

FIELD: radio-technical tools which use magnetic resonance for finding and detecting primarily drugs and explosives, and also use polarization selection and phase analysis for finding and detecting drugs, packed in non-metallic cover.

SUBSTANCE: method for remote detection of a substance includes remote excitation of magnetic resonance in a substance by an electromagnetic wave and following measurement of response frequency, while exciting electromagnetic signal is emitted at frequency much greater compared to frequency of magnetic resonance of substance, and emitted excitation electromagnetic signal is modulated by polarization at frequency of magnetic resonance, and response is recorded at modulation frequency. Electromagnetic probing is performed by flat-polarized signal and signals are received with right and left circular polarization which are reflected from drug substance, while reflected signal with right circular polarization is gated on basis of time, proportional to depth of position of drug substance, and reflected signal with left circular polarization is transformed by frequency with usage of heterodyne voltage, voltage of intermediate frequency is selected, multiplied with reflected signal with right circular polarization, harmonic voltage is selected at stable frequency of heterodyne, phase shift is measured between reflected signals from right and left circular polarization at stable frequency of heterodyne, measured value of phase shift is compared to standard value and on basis of comparison result, decision is taken about presence of drug substance in hiding environment.

EFFECT: increased trustworthiness of detection and increased depth resolution when determining location of drugs.

1 dwg