STATIONARY METAL DETECTOR Russian patent published in 2001 - IPC

FIELD: search equipment. SUBSTANCE: detector is designed for detection of large ferromagnetic objects, mainly firearms, carried by checked persons through checked passage. Stationary metal detector has flat horizontal magnetization coil located under floor of checked passage transverse to movement, electronic unit connected to it, two identical converters of variable magnetic field placed along sides of checked passage, oriented and so connected that voltages of signals caused by re-radiation field of detected object are mutually summed up and voltages caused by field of industrial noises are mutually subtracted. EFFECT: enhanced compactness of detector, widened efficiently checked passage and increased protection against industrial noises. 1 dwg