Abstract
Alternating current field measurement (ACFM) is one of the most important techniques for detecting metal cracks. During measurement, however, the changes in lift-off distance caused by coating corrosion and irregularity of the surface greatly affect the accuracy of crack sizing. To overcome this drawback, an advanced algorithm is proposed in this paper to compensate for the lift-off effect. Benefitting from this method, the dimensions of cracks can be inversed directly without considering the lift-off distance. More importantly, the algorithm has been verified efficiently as estimating the cracks of an aluminum workpiece. The results show that the sizing errors based on this algorithm can be limited to 10%.
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