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

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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Electromagnetic acoustic transducer,Flexible transducer,Rayleigh wave,Non-destructive testing
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要点】:本文提出了一种增强型柔性电磁声表面激发器(EMAT),通过采用阵列磁芯代替传统偏置永磁体,提高了超声波能量转换效率,并成功应用于曲面金属结构的检测。

方法】:作者通过在跑道型线圈柔性电磁铁中引入阵列磁芯来增强偏置磁场和能量转换效率。

实验】:通过数值模拟和实验验证,使用原型传感器证明了增强型柔性EMAT在检测曲面金属结构组件表面裂纹方面具有良好的性能,实验数据集未在文中明确提及。