In magnetic flux leakage (MFL) type nondestructive testing (NDT), there could be velocity-induced eddy currents during the sensing, which might cause the distortion of the defect signals. In this paper, the distortions of the sensing signals are analyzed by using three-dimensional finite-element analysis with velocity-induced eddy currents, and then, the compensation scheme of the signal distortion is presented to obtain the pure defect signals. The presented method has been verified by experimental measurement.
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Park et al. (2004) studied this question.
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