期刊
ULTRASONICS
卷 135, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultras.2023.107137
关键词
Electromagnetic acoustic transducer (EMAT); Guided waves; shear horizontal (SH) waves; Focusing
This study proposes a novel design of EMAT with a new coil structure, which shows better performance compared to conventional EMAT models in detecting surface defects in pipelines.
Guided wave electromagnetic acoustic transducers (EMATs) have a significant role in non-destructive testing and structural health monitoring. It can generate horizontally polarized shear waves propagating axially or circumferentially to characterize the shape and orientation of pipeline defects. This work proposes a new Chevron pattern-like coil structure design with a periodic permanent magnet (PPM) EMAT configuration. This specific design of the EMAT coil can generate a bi-directional shear horizontal wave (SH-wave) and reduce the side lobes. An optimal Chevron angle of coil wires assists in generating orthogonal propagating waveforms. These phenomena lead to the constructive interference of propagating waves and develop a resulting wave along the horizontal direction. A 3D FEM modeling and simulation have been carried out and validated with experimental results. The proposed EMAT results are compared with the conventional racetrack PPM EMAT model, which shows a significant improvement over conventional EMATs. A prototype of this proposed EMAT has been developed. It can be used to inspect surface defects in applications such as fuel transportation pipelines.
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