METAL DETECTOR Russian patent published in 2015 - IPC G01V3/11 

FIELD: instrumentation.

SUBSTANCE: invention relates to the field of introscopy, more specifically to metal detectors, and may be used for solving the task of metal objects detection, which are in different covering media, in particular, in low and high mineralized soil, building walls, etc. Substance: a metal detector comprises a generator, a metal detector sensor, the first quadrature components identification (FQCI), the second FQCI, a microprocessor and an indication unit. The metal detector sensor comprises the first unit of coils, comprising the first exciting coil, excited by the first excitation frequency, and the first signal coil, and the second unit of coils, comprising the second exciting coil, excited by the second excitation frequency, and the second signal coil. The first exciting coil and the first signal coil are placed in a single plane and are partially matched. The value of the matching zone of the first exciting coil and the first signal coil is selected so that there is minimum flow of induction via the first signal coil. The second exciting coil and the second signal coil are placed in a single plane and are partially matched. The value of the matching zone of the second exciting coil and the second signal coil is selected so that there is minimum flow of induction via the second signal coil. The plane of the second exciting coil is applied onto the plane of the first exciting coil. The plane of the second signal coil is applied onto the plane of the first signal coil. At the same time the zone of matching of coils in the second unit of coils is fully applied onto the zone of matching of coils of the first unit of coils.

EFFECT: simplified design of a metal detector sensor, increased information value of metal object search, expansion of functional capabilities of a metal detector.

8 cl, 3 dwg