Thickness Measurement of Frequency Domain Lift-off Point of Intersection Detected by Pulsed Eddy Current Testing
Addressing the issue that the techniques used to obtain time domain LOI(lift-off point of intersection)in pulsed eddy current detection signals for ferromagnetic and non-ferromagnetic materials are inconsistent and the uniformity in extracting time domain LOI signal characteristics is limited,this paper studies the influence law of probe lift-off change on the amplitude spectrum,phase spectrum,and real part spectrum of pulsed eddy current differential signals by analyzing the pulsed eddy current differential signals of ferromagnetic and non-ferromagnetic materials.It obtains the frequency domain LOI in the frequency spectrum of pulsed eddy current differential signals and further analyses the feasibility of measuring the thickness of the frequency domain LOI,providing method guidance for unifying and expanding the acquisition method of LOI and improving the measurement range of LOI.
pulsed eddy current detectionlift-off point of intersectionferromagnetic materialsnon-ferromagnetic materialsfrequency-domain analysis
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