Novel Directionally Steered Eddy Current Testing Method

Le résumé fourni par la source

The arbitrary orientation of natural cracks in industry poses significant challenges for their accurate inspection. Moreover, precisely quantifying the crack orientation is a prerequisite for quantitative evaluation of crack dimensions. To address this, this paper proposes a novel directionally steered eddy current (DSEC) testing method, which can control eddy current directions by changing the amplitudes ratio of two orthogonal excitation currents. This resulting multi-directional eddy current excitation enables the inspection system to maintain higher sensitivity to cracks of any orientation, which effectively improves the detection probability of cracks in unknown directions. A 3D FEM model is established to study the method by analyzing the effect of the crack orientation on the eddy currents. A crack quantification method is proposed based on the simulation results, and the average absolute errors of crack orientation and length quantification remain below 5° and 0.47 mm respectively. A prototype probe is developed to experimentally validated, and the experimental results demonstrate the feasibility and superiority of the proposed DSEC method in crack detection and quantification.

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