Characteristics of T(0,1) Guided-Wave Point-Focusing Electromagnetic Acoustic Transducer for Pipe Inspection
Characteristics of T(0,1) Guided-Wave Point-Focusing Electromagnetic Acoustic Transducer for Pipe Inspection
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用于管道检测的 T(0,1) 导波点聚焦电磁声换能器的特性
DOI：
10.1109/jsen.2019.2958953
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发表时间：
2020
影响因子：
4.3
通讯作者：
Wang Shen
中科院分区：
文献类型：
--
作者：
Huang Songling;Sun Hongyu;Shen Gongtian;Wang Baoxuan;Wang Qing;Zou Jun;Wang Shen
电磁声换能器（EMAT）具有非接触、适用于复杂环境等优点，在无损检测和无损评价领域得到了广泛应用。然而，其能量转换效率低，限制了其在工业测试中的应用。为了提高电磁超声换能器的能量转换效率，提出了一种基于管道中T（0，1）波的聚焦式电磁超声换能器。本文对点聚焦换能器的焦距和缺陷宽度进行了研究，并与传统的非聚焦换能器进行了比较。结果表明，新设计的管道聚焦式电磁超声换能器可使缺陷反射波强度提高60%左右，与未聚焦式电磁超声换能器相比，实验中反射波强度可提高70%。
Electromagnetic acoustic transducers (EMATs) are widely used in the field of non-destructive testing (NDT) and non-destructive evaluation (NDE) due to their advantages of non-contact and applicability in complex environments. However, their low energy-conversion efficiency restricts their application in industrial testing. This work proposes a newly designed focusing EMAT based on the T(0, 1)-wave in a pipe to improve the energy conversion efficiency of EMATs. The focal length and defect width are investigated in this paper, and the advantages of the newly designed point-focusing transducer are shown in comparison with traditional unfocused transducers. Results show that the newly designed pipe focusing EMAT can increase the intensity of the defect reflection wave by around 60%, and the reflected wave intensity can be enhanced by 70% in the experiment when compared to the unfocused one.