Patent ID: 6534976
Filing Date: 2003-03-18
Classification: G01N

Abstract:
A device for inspecting a part by eddy currents, the device comprising at least one measurement circuit including an active coil which is connected between a first terminal and a second terminal, and a reference circuit which is connected between said second terminal and a third terminal, said first and third terminals being for connection to an AC voltage generator so that an alternating magnetic field is generated by the active coil in the part to be inspected in order to enable any variation in the impedance of the active coil on passing over a defect in a part under inspection to be detected by analyzing an output voltage of the device, wherein the reference circuit is a reference coil identical to the active coil, wherein the first terminal and the third terminal receive voltages applied by the AC voltage generator which are equal in value and of opposite signs relative to a neutral phase of said generator, and the output voltage is the voltage read between said second terminal and said neutral phase, and wherein the reference coil is electromagnetically isolated from the part to be inspected.