Abstract
Remote-field eddy current testing (RFECT) technology breaks through the limitation of skin effect. It has shown its advantages over the other electromagnetic non-destructive evaluation (ENDE) techniques in the detection and characterization of deeper defects. In this paper, a new RFEC transducer is designed for plate defect detection. The optimal sensor design scheme is obtained by comparing and analyzing the material and composition of the sensor shield structure through numerical simulation. Then, the identification and quantitative analysis of the detection signals is studied. The defect detection experiment is carried out to prove the effectiveness of the transducer. The results show that fitting relationship between the phase of the sensor detection signal and the defect depth are the quadratic function. The defect depth can be quantitatively analyzed by the phase of the detection signal. The new designed transducer is promising in online detection of buried defects in pressure vessels and pipes.
