Analysis of Coil-Dependent Receiving Frequency Response of PPM EMAT Receiver Using Equivalent Model

IF 2.6 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Journal of Nondestructive Evaluation Pub Date : 2024-05-09 DOI:10.1007/s10921-024-01077-6

Junjie Wang, Xinjun Wu, Wenlong Zhang

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Abstract

Period-permanent-magnet (PPM) electromagnetic acoustic transducer (EMAT) has been widely used in shear horizontal (SH) ultrasonic guided wave testing owing to its advantages, such as non-contact coupling, and convenient to excite SH waves. However, its poor transduction efficiency leads to weak signals and limits the lift-off performance. This article investigates how to improve the signal amplitude by adjusting the number of turns of the racetrack coil. The inductive coupling process of the PPM-EMAT receiver is first studied using the equivalent circuit method, and the corresponding equivalent model is obtained. Aiming at the effects of coil configurations, the equivalent impedance parameters of multilayer racetrack coils are analyzed by calculations and measurements. The proposed model can be used to predict the receiving frequency response of PPM-EMAT receivers with different coil structures, and it has been verified experimentally. It can be obtained that by choosing an appropriate coil configuration and matching resistance, the SH wave signal amplitude can be increased by 3 times.

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利用等效模型分析 PPM EMAT 接收器与线圈有关的接收频率响应

周期永磁（PPM）电磁声换能器（EMAT）具有非接触耦合、便于激发水平剪切（SH）超声导波等优点，已广泛应用于水平剪切（SH）超声导波测试。然而，其较低的传导效率导致信号微弱，限制了升降性能。本文研究了如何通过调整赛道线圈的匝数来提高信号幅度。首先使用等效电路方法研究了 PPM-EMAT 接收器的电感耦合过程，并得到了相应的等效模型。针对线圈配置的影响，通过计算和测量分析了多层赛道线圈的等效阻抗参数。所提出的模型可用于预测具有不同线圈结构的 PPM-EMAT 接收器的接收频率响应，并已得到实验验证。结果表明，通过选择适当的线圈结构和匹配电阻，可以将 SH 波信号幅度提高 3 倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nondestructive Evaluation 工程技术-材料科学：表征与测试

CiteScore

4.90

自引率

7.10%

发文量

审稿时长

9 months

期刊介绍： Journal of Nondestructive Evaluation provides a forum for the broad range of scientific and engineering activities involved in developing a quantitative nondestructive evaluation (NDE) capability. This interdisciplinary journal publishes papers on the development of new equipment, analyses, and approaches to nondestructive measurements.