Abstract
In order to reduce noise disturbance of alternating current field measurement (ACFM) signals in crack defects detection, a new noise cancellation method called empirical mode decomposition (EMD) was proposed. A butt welded plate specimen was inspected and measured by a hand-held ACFM probe and a TSC AMIGO instrument. The original ACFM signal was first decomposed into different intrinsic mode functions (IMFs) and a residue, and some IMFs containing useful information were subsequently reconstructed based on correlation coefficients. The experimental results show that the reconstructed ACFM signals Bx and Bz, and butterfly plot can characterize crack defects more accurately, demonstrating the feasibility and effectiveness of the proposed method.
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