A micro-ECT (Eddy Current Testing) probe which consists of a planar microloop inductive magnetic sensor array and a pancake-type exciting coil was developed to upgrade the ECT technology on the inspection for a steam generator (SG) tubing in a pressurized nuclear power plant (PWR). Eddy currents and resultant magnetic fields are perturbed due to a flaw in a conductor. The flaw is detected via perturbation of electromotive force (EMF) and phase from the array. Flaws manufactured by electric discharge machining (EDM) in INCONEL 600 1.25mmt planar specimens were detected and reconstructed by using stacked database and simplified algorithm. Even outer 10% flaw could be detected. Measured EMF and phase signals were compared with numerical results obtained by using a three dimensional eddy current and field analysis code and verified. It was confirmed by the experiment that the spatial resolution of detection of the micro-ECT probe is superior to that of the conventional pancake-type ECT probe. Finally we demonstrated that we could establish the same measurement speed using the micro-ECT probe as that using the pancake-type ECT probe.
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Uesaka et al. (1995) studied this question.
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