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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Design Method of Multiwavelength EMATs Based on Spatial Domain Harmonic Control
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Design Method of Multiwavelength EMATs Based on Spatial Domain Harmonic Control

机译：基于空间域谐波控制的多波长Emats的设计方法

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摘要

Conventional electromagnetic acoustic transducers (EMATs) are generally only used to generate and detect guided waves with a single wavelength, which increases their sensitivity at that particular wavelength but limits their application scenarios and the accuracy of defect assessment. This article proposes a design method for multiwavelength EMATs based on spatial-domain harmonic control. First, the EMAT model is analyzed, where it is then outlined that the eddy-current density distribution of the specimen is equivalent to the spatial low-pass filtering of the coil-current density distribution. This shows that the multiwavelength guided waves can be achieved as long as the spatial distribution of the coil-current density contains those multiple harmonics that are desired. It is then proposed that the structure of the EMAT coil is equivalent to the spatial sampled pulse sequences of a spatial signal. The coil parameter design based on pulse modulation technology is proposed. Taking a dual-wavelength EMAT design for Lamb waves as an example, details of the coil parameter design are presented. The simulation and experiment with the dual-wavelength EMAT proved the correctness of the proposed method. Finally, an experiment with a three-wavelength EMAT demonstrated the feasibility of the proposed method in designing multiwavelength EMATs.
机译：传统的电磁声换能器（Emats）通常仅用于产生和检测具有单个波长的引导波，这增加了它们在特定波长的灵敏度，而是限制其应用场景和缺陷评估的准确性。本文提出了一种基于空间域谐波控制的多波长Emats的设计方法。首先，分析EMAT模型，然后概述了样本的涡流密度分布等同于线圈电流密度分布的空间低通滤波。这表明，只要线圈电流密度的空间分布包含所需的那些多次次次次次次次次次次次次次次次次次次次次谐波，就可以实现多波长导向波。然后提出了EMAT线圈的结构等同于空间信号的空间采样脉冲序列。提出了基于脉冲调制技术的线圈参数设计。为羊波采用双波长EMAT设计，作为示例，提出了线圈参数设计的细节。双波长EMAT的模拟和实验证明了该方法的正确性。最后，具有三波长EMAT的实验证明了所提出的方法在设计多波长Emats时的可行性。

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