![]() This is because the transducer assumes that the eddy currents are localized near the surface of a semi-infinite solid, and the actual eddy current amplitude decreases quadratically with distance. The target material must be at least three times thicker than the effective depth of the eddy currents to make the transducer successful.The eddy currents are confined to shallow depths near the conductive target surface. This change in impedance can be detected by a carefully arranged bridge circuit. When the distance between the target and the probe changes, the impedance of the coil changes correspondingly.This local electric current in turn induces a magnetic field opposite in sense to the one from the active coil and reduces the inductance in the coil. ![]() An eddy current is a local electric current induced in a conductive material by the magnetic field produced by the active coil. ![]()
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