In modern industries, long-distance guided wave inspection has been routinely used for various types of pipelines. The usage of T(0,1) wave is always of great interests since it is the only non-dispersive wave mode in pipes. In this work, a pair of pitch-catch piezoelectric ring arrays were proposed for long-distance structural health monitoring (SHM) of buried pipes. Firstly, the working principle of the proposed transducer was introduced. Next, the performances of thickness-shear (d15) and face-shear (d24) modes based piezoelectric ring transducers in T(0,1) wave generation and reception were comparatively tested. It was found that at most frequencies, it is best to employ the d15 ring as the exciter and the d24 ring as the receiver. Then, the signal-to-noise ratio (SNR) of the generated T(0,1) wave and its attenuation in pipes with different coating conditions were investigated to estimate the detectable distance using the proposed transducer. Results showed that after applying acoustical isolation layer on pipes, the proposed ring transducers can inspect buried pipes over 20 m. Finally, the performance of the ring transducers in defect detection was validated. This work is expected to provide a promising solution to long-distance SHM of buried pipes.

中文翻译：

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使用一发一收T(0,1)波压电环形阵列换能器对埋地管道进行远距离结构健康监测

在现代工业中，长距离导波检测已常规用于各种类型的管道。T(0,1) 波的使用一直很受关注，因为它是管道中唯一的非色散波模式。在这项工作中，提出了一对一发一收的压电环形阵列，用于埋地管道的长距离结构健康监测（SHM）。首先，介绍了所提出的换能器的工作原理。接下来，比较测试了基于厚度剪切 (d15) 和面剪切 (d24) 模式的压电环形换能器在 T(0,1) 波产生和接收方面的性能。发现在大多数频率下，最好采用d15环作为激励器，d24环作为接收器。然后，生成的 T(0, 1) 研究了具有不同涂层条件的管道中的波及其衰减，以使用所提出的换能器估计可检测距离。结果表明，在管道上应用隔音层后，所提出的环形换能器可以检测超过 20 m 的埋地管道。最后，验证了环形传感器在缺陷检测中的性能。这项工作有望为埋地管道的长距离 SHM 提供有前景的解决方案。