Patent ID: 6291992
Filing Date: 2001-09-18
Classification: G01B,G01N

Abstract:
A device for inspecting an object of electrically conductive material, comprising:a signal transmitter for generating an electromagnetic field in the object, inducing eddy currents in the object during operation of the transmitter;a receiver for measuring the decay of the eddy current following operation of the transmitter and for producing a signal representing the decay of the eddy current; anda processor for determining the thickness of the object as a linear function of the eddy current decay signal;wherein the signal transmitter comprises a signal generator connected to at least two emitters coils, the emitter coils being substantially co-planar and in close proximity to each other, for emitting the electromagnetic field, which emitters coils are, during normal operation, so driven that the resulting electromagnetic field in a central region, between the emitters, is intensified.