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The comparison of the average reconstructed thickness of the defect obtained by full waveform inversion (FWI) at 60 kHz and predictions by Faraday’s law in different corrosion periods of a mild steel plate. The upper and lower limits of measured thickness of defect A and B at corrosion time of 74 and 110 h obtained by FWI and laser profilometry are shown in the rectangular boxes, respectively. The results of laser profilometry will be explained in Section 5.2.
