Array pulsed remote field eddy current testing signal denoising method
To address the limitations of conventional pulsed remote field eddy current testing(PRFECT)in accurately determining the circumferential position of defects,we propose an innovative array-based PRFECT probe.This method involves increasing the number of receiving coils and modifying the relative positions of the receiving and excitation coils to enhance defect localization capabilities.To address the issue of weak signals detected,a hybrid signal denoising technique combining successive variational mode decomposition(SVMD)and singular value decomposition(SVD)is introduced.Initially,the signal is decomposed into a series of modal functions using SVMD.Subsequently,components for reconstruction are selected based on the Pearson correlation coefficient.The retained components are then denoised using the SVD method,and these denoised components are superimposed to reconstruct the signal.Both simulations and experimental results demonstrate that the proposed novel probe effectively locates defect positions,The proposed algorithm can improve the Denoising Signal-to-Noise Ratio of the measured key signal to 9.30,better than traditional algorithm.
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