A Flexible Emat Enhanced with Array Magnetic Core for Inspection of Curved Structure

Yuange Zhang,Cuixiang Pei,Jie Deng,Tianhao Liu, Yinqiang Qu,Hong-En Chen,Zhenmao Chen

SENSORS AND ACTUATORS A-PHYSICAL（2024）

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Abstract

Electromagnetic acoustic transducer (EMAT) is widely applied for non-contacting ultrasonic testing of metallic structures. In this paper, an enhanced flexible EMAT is proposed and optimized to improve ultrasonic energy conversion efficiency by adopting an array magnetic core to a racetrack coil-type flexible electromagnetic magnet in replacement of the conventional bias permanent magnet. Numerical simulations and experimental investigations conducted with prototype transducers of the enhanced flexible EMAT show that the bias magnetic field and the energy conversion efficiency of the new EMAT can be significantly enhanced due to the application of the magnetic core array. Thanks to the advantage of flexible magnet structure, it is proved that the proposed new EMAT has good performance to detect surface cracks in curved metallic structural components.

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Key words

Electromagnetic acoustic transducer,Flexible transducer,Rayleigh wave,Non-destructive testing

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