Abstract
The purpose of this paper is the development of a pulsed eddy current test equipment for applications to nondestructive testing. The device, includes a pulsed current generator, an X-Y displacement system and a fast digitizer. The whole is controlled by a micro-computer system. We further propose an electrical model to describe the possibilities of our pulse generator (pulse width and magnitude, charge and discharge time, maximal repetition rate…). This test equipment is first used in through transmission to measure the thickness of non-magnetic metal plates without contact. The pulse generator is also used in reflection with one or two receiving coils, in a differential assembly. A study has been done to determine the best exciting and receiving coils as well as their best shielding materials. By increasing the sensibibity, we point out that it is possible to detect small artificial defects drilled in different materials at different depths.
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