SENSOR CONTROLLED BY EDDY CURRENTS

摘要

The invention concerns a sensor comprising at least a coil emitting (2) a magnetic field and a receiver element (3) sensitive to eddy currents induced by the field in the thickness of an adjacent metal part (1). Conductor screens (6) are arranged around the receiver elements (3) to exclude them for direct induction by the coil (2). The remainder of the sensor is made of non-magnetic material such nickel or copper alloy. Said conductor screen arrangement prevents the electromagnetic energy generated by the coil (2) on the part (1) from being weakened. Such eddy current sensors are useful for detecting defects and for non-destructive control of surfaces.