FIELD: radiospectroscopy.
SUBSTANCE: according to the method of detecting explosives and drugs the spot being suspected in storing matters kept in non-metal container is influenced by high-frequency magnetic field radio-frequency variable duration pulses. Frequency of carrier is close to frequency of quadrupole nuclear resonance of detected matter. Induced electromotive force is measured during periods of absence of pulses from phase-sensitive detection circuit. Response input signals are summed subsequently which signals are detected at special moments of time. Matters to be found have preset known parameters of nuclear quadrupole resonance. Duration of pulses of illuminating pulses is changed to compensate drop in sensitivity induced by non-uniformity of radio-frequency filed of illuminating coil.
EFFECT: improved capability of detection of matters in tested area.
4 dwg
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