Analytical modelling and analysis of the meander-line coil EMATs

IF 3.8 2区物理与天体物理 Q1 ACOUSTICS Ultrasonics Pub Date : 2024-10-21 DOI:10.1016/j.ultras.2024.107493

Runjie Yang , Zhichao Li , Shujuan Wang , Chuanliu Jiang

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Abstract

The meander-line coil electromagnetic acoustic transducer (EMAT) is widely used in the field of ultrasonic nondestructive testing due to its convenience to generate specific mode of guided waves. Some design methods of the meander-coil EMATs are developed in the frequency-wavenumber domain while others in the time–space domain. In this paper, a unified theoretical framework is developed by proposing an analytical model from the system perspective. Signal transfers between different physical fields in EMAT excitation, wave propagation and EMAT reception are represented as linear time–space-invariant systems. Taking the Rayleigh wave EMAT detection as an example, the analytical model for the transfer functions of these systems is established. The analytical model is experimentally verified by different Rayleigh wave detection techniques: the conventional EMAT, the spatial pulse compression (SPC) EMAT, temporal-spatial pulse compression (TSPC) EMAT and detection cases employing the same receiving EMAT. From the system perspective, the received signal of EMAT is interpreted as the response of the filter system to the input signal. It is found that the meander-coil EMAT can be regarded as the frequency domain expression during the detection. And the frequency domain expression plays different roles in different techniques.

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蜿蜒线线圈电磁流量计的分析模型和分析。

蜿蜒线线圈电磁声换能器（EMAT）因其便于产生特定模式的导波而被广泛应用于超声波无损检测领域。蜿蜒线线圈电磁声换能器的一些设计方法是在频率-波数域中开发的，而另一些则是在时空域中开发的。本文从系统角度提出了一个分析模型，从而建立了一个统一的理论框架。EMAT 激发、波传播和 EMAT 接收过程中不同物理场之间的信号传输被表示为线性时空不变系统。以瑞利波电磁超声检测为例，建立了这些系统传递函数的分析模型。该分析模型通过不同的瑞利波检测技术进行了实验验证：传统的电磁超声波检测技术、空间脉冲压缩（SPC）电磁超声波检测技术、时间空间脉冲压缩（TSPC）电磁超声波检测技术以及采用相同接收电磁超声波检测技术的检测情况。从系统角度看，电磁超声波接收器的接收信号被解释为滤波系统对输入信号的响应。在检测过程中，可以将蜿蜒线圈 EMAT 视为频域表达式。而频域表达式在不同的技术中发挥着不同的作用。

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

Ultrasonics 医学-核医学

CiteScore

7.60

自引率

19.00%

发文量

186

审稿时长

3.9 months

期刊介绍： Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.