This chapter describes a method for identifying the number and positions of cracks and reconstructing of the crack shape. Using the eddy current testing signal obtained by 2D scanning as a picture image, a template matching method, with the help of a genetic algorithm is applied to predict the number and positions of the cracks. The present method employs the scaling technique of a signal profile with respect to crack length, which is verified by numerical simulation. The number and positions of the cracks are sufficiently well predicted. Crack shape reconstructions from the predicted data are achieved with a satisfactory degree of accuracy.
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