EDDY-CURRENT TESTING METHOD AND EDDY-CURRENT TESTING DEVICE

An eddy-current testing method comprises liftoff signal measuring step of giving liftoff to an eddy-current testing probe including one or more coils and measuring a liftoff signal of a reference specimen, phase recording step of recording a phase of a Lissajous figure obtained from the liftoff sign...

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Bibliographische Detailangaben
Hauptverfasser: NISHIMIZU, Akira, SUZUKI, Yutaka, KAKUGAWA, Shigeru
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An eddy-current testing method comprises liftoff signal measuring step of giving liftoff to an eddy-current testing probe including one or more coils and measuring a liftoff signal of a reference specimen, phase recording step of recording a phase of a Lissajous figure obtained from the liftoff signal of the reference specimen, eddy-current testing signal measuring step of measuring an eddy-current testing signal of an object using the eddy-current testing probe, and decision step of deciding that the eddy-current testing signal detected in the eddy-current testing signal measuring step is a liftoff signal if the eddy-current testing probe detects the eddy-current testing signal in all the coils in the eddy-current testing signal measuring step and a phase of a Lissajous figure obtained from the eddy-current testing signal detected in the eddy-current testing signal measuring step coincides with the phase recorded in the phase recording step for all the coils.