An eddy current testing (ECT) and an electromagnetic acoustic testing (EMAT) employ electromagnetic methods
to induce an eddy current and to detect flaws on or within a sample without directly contacting it. ECT produces
Lissajous curves, and EMAT gives us a time series of signal data, both of which can be directly displayed on
nondestructive testing (NDT) equipment screens. Since the interpretation of such output is difficult for untrained
persons, images need to be properly reconstructed and visualized. This could be carried out by single-probe
2/3D scanners with imaging capabilities or with array probes, but such equipment is often too large or heavy
for ordinary on-site use. In this study, we introduce a flexible scanning tablet for on-site NDT and imaging of
detected flaws. The flexible scanning tablet consists of a thin film or a paper with a digitally encoded coordinate
system, applicable to flat and curved surfaces, that enables probe positions to be tracked by a specialized optical
reader. We also discuss how ECT and EMAT probe coordinates and measurement data could be simultaneously
derived and used for further image reconstruction and visualization.
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