Recently, the development and the research of high performance new ECT probe have been conducted aiming at high precision ECT flaw testing [1–3]. The authors devised a new ECT probe named the Hoshi Probe using uniform rotating direction eddy current. The Hoshi Probe has the following features: 1) self-nulling, 2) self-differential, 3) lift-off noise free, and 4) different signal generation depending on the direction and the position of defect. The authors reported on these basic characteristics of the Hoshi Probe [4].
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