Abstract
Eddy current thermography (ECT) plays an important role in the field of nondestructive testing (NDT). In this study, a moving detection mode of ECT is used for crack detection and the temperature distribution near the crack in this mode is studied. Firstly, the numerical simulation is used to analyze the eddy current distribution on the specimen surface. And then the experimental studies are carried out and thermal images are obtained in the experiments. The surface temperature distribution of the specimen is analyzed, and the fitted curve of the temperature decline trend is given. The curve is helpful to determine the best detection area. The temperature distribution characteristics near the crack are analyzed and the position of the largest temperature difference on the specimen surface is determined. Finally, a new method for determination of crack opening size based on edge detection technology is proposed, and the size of the crack opening is obtained.
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