This paper describes improvement of an arrayed multi-coil probe of eddy current testing for steam generator tubes which was previously reported by the authors. Owing to the multi-coil arrangement, the present probe can detect cracks in the whole round of the tube without rotation, which leads to speedy scan of tubes. However, the authors confirmed the existence of less sensitive zone in the previous paper. In this paper, arrangement of element coils was considered with the help of numerical simulation so as to eliminate less sensitive zones. Experiment with use of the improved probe showed that maximum decrease of crack signals was improved to be 5% from 20% due to the change of coil arrangement in the probe. In addition, it was confirmed that the present probe can detect a outer defect of 20% in steam generator tubes with simulated support structures which are noise sources.
|ジャーナル||Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|出版ステータス||Published - 2003 11|
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