电磁声换能器
声学
传感器
信号(编程语言)
兰姆波
磁铁
材料科学
色散(光学)
振幅
超声波传感器
导波测试
光学
波传播
工程类
超声波检测
物理
电气工程
计算机科学
程序设计语言
作者
Xu Zhang,Bo Li,Xiaolong Zhang,Xiaochun Song,Jun Tu,Chao Cai,Jiandong Yuan,Qiao Wu
出处
期刊:Sensors
[MDPI AG]
日期:2023-10-31
卷期号:23 (21): 8843-8843
被引量:2
摘要
Periodic permanent magnet(PPM) electromagnetic acoustic transducers (EMATs) are commonly employed for axial defect inspection in pipelines. However, the lowest-order shear horizontal waves (SH0) guided waves have difficulties in distinctly differentiating internal and external defects. To enhance the signal-to-noise ratio and resolution, a unidirectional electromagnetic acoustic transducer (EMAT) based on Circumferential Lamb waves (CLamb waves) is developed. Through structural parameter optimization and excitation frequency adjustment, high-amplitude and low-dispersion CLamb waves are successfully generated in the high-frequency-thickness product region of the dispersion curve. Finite element simulations and experimental validation confirm the capability of this EMAT in exciting CLamb waves for the detection of crack-like defects. Experimental results demonstrate that the excitation efficiency of the CLamb EMAT exceeds that of the periodic permanent magnet electromagnetic acoustic transducer by more than tenfold. The defect reflection signal of the CLamb EMAT exhibits higher resolution and more significant amplitude compared to the PPM EMAT. The integration of this method with SH0 mode detection allows for the inspection of both internal and external defects in pipelines, offering a new avenue for EMAT applications in pipeline inspection.
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