Imaging of Subsurface Defects with Surface Wave SAFT Based on an Array Pickup EMAT

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

International Journal of Applied Electromagnetics and Mechanics（2024）

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Abstract

It is necessary to detect subsurface defects for a key metallic structural component especially a multilayer coating to ensure its structural integrity. In this paper, an imaging algorithm using the synthetic aperture focusing technique (SAFT) is developed for processing surface wave signals of array pickup electromagnetic acoustic transducer (EMAT) to improve its signal-to-noise ratio and detectability of subsurface defects. In addition, an array pickup unit of surface wave EMAT with gap configuration is proposed to receive multi-channel surface wave signals and is optimized by adjusting its coil configuration such as number, spacing and detection distance in order to obtain better SAFT imaging result. Both simulation and measured EMAT surface wave signals are used for the defect imaging and all the results verified the validity and the efficiency of the proposed method.

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Key words

Updated SAFT,array pickup EMAT,surface wave,subsurface defects

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