METHOD OF DETECTING MOVING ELECTROCONDUCTIVE OBJECTS AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2013 - IPC G08B13/24 

FIELD: physics.

SUBSTANCE: antennae of radiators (1) and devices (2) for measuring an electromagnetic signal are made in form of magnetic dipoles. The radiators (1) and the measuring devices (2) are placed along the median line (5) of an object detection zone. Magnetic dipoles are arranged in one row in form of successive alternating cells of radiators (8) and cells of measuring devices (9). Each cell of radiators (8) and each cell of measuring devices (9) consists of two series-connected magnetic dipoles. The magnetic moment vector $$\overline{m}$$ of each magnetic dipole lies in the horizontal plane and is aligned orthogonal to the tangent of the median line (5) of the object detection zone. First, a first radiator m₁₁ is switched on in a selected cell of radiators (8) and an electromagnetic signal is received by the measuring device m₃₁ furthest from the first radiator and located in a cell of measuring devices (9) adjacent to the first radiator m₃₁ and the measuring device m₂₁ closest to the first radiator and located in the opposite cell of measuring devices (9) adjacent to the second radiator m₁₂ in the selected cell of radiators. After transmitting and receiving the electromagnetic signal transmitted by the first radiator m₁₁, the second radiator m₁₂ is switched on in the selected cell of radiators. The electromagnetic signal is received by the measuring device m₂₂ furthest from the second radiator and located in a cell of measuring devices (9) adjacent to the second radiator m₁₂, and by the measuring device m₃₂ closest to the second radiator and located in the opposite cell of measuring devices (9), adjacent to the first radiator m₁₁. A moving electroconductive object and its location are determined by comparing electromagnetic signals obtained when switching on the first and second radiators of each cell of radiators (8) with a predetermined signal threshold.

EFFECT: high reliability of detecting moving electroconductive biological objects and accuracy of determining the spatial region of the detection zone in which a secure area was breached.

16 cl, 3 dwg