METAL DETECTOR Russian patent published in 2002 - IPC

FIELD: archaeology and construction in search of metal objects under a layer of ground and snow, food and wood-working industries for detection of metal particles and objects in the mass of raw material, military industry for detection of mines under a layer of ground and snow, flaw detection and for other purposes. SUBSTANCE: metal detector has an AC generator, the first and second inductance transducers with magnetizing and pickup coils, voltage compensator, the first and second AC amplifiers, synchronous detectors and a cophasal and quadrature component, the first and second direct component filters, full-wave rectifier, summer, the first and second pointer indicators, the first and second phase shifters, the first and second amplitude detectors, subtracter, generator, divider, reference voltage formation unit, comparison unit and a key. EFFECT: enhanced reliability of detection of small metal objects and mines. 1 dwg