Fig. 7.

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Data from the Eddy Current testing (ECT) by Bobbin probe at various frequencies (Start-End) show a defect on the outer surface (OD) of the measured steam generator tube from NPP Bohunice V1. The eddy current signal is visualized as: a) a linear progression over time of individual signal components with the axial position of the indication, and b) the display of indication in the XY plane (a complex impedance plane). The parameters of indication for the main measurement frequency f=200 kHz are A=4.89 [V], phase = 87 [°], wall thickness loss = 70%. Peak-to-Peak Voltage (Vpp) measurement mode used.

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