Field dependence of coupling efficiency between electromagnetic field and ultrasonic bulk waves
Field dependence of coupling efficiency between electromagnetic field and ultrasonic bulk waves
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DOI：
10.1063/1.365701
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发表时间：
1997-10-15
影响因子：
3.2
通讯作者：
Ogi, H
中科院分区：
文献类型：
--
作者：
Ogi, H
本文通过研究电磁超声换能器（EMAT）体波振幅随磁场的变化关系，研究了体波的耦合机理。放置在低碳钢薄板上的螺旋形细长线圈在存在偏置磁场的情况下激发并接收在厚度方向上传播的纵波和横波。体波振幅的场依赖性测量使用电磁声共振法向和切向偏置场，这表现出不同的功能，根据偏置场方向和波模式。一个二维模型的解释所观察到的结果。本分析强调了倾斜的总磁场的磁致伸缩常数的推导，这是揭示了发挥重要作用的波的产生。测量和模型分析都得出结论，磁致伸缩效应占主导地位的电磁超声现象的体波在铁磁金属，无论偏置磁场的方向。(C)1997年美国物理学会。
The coupling mechanism of the electromagnetic acoustic transducer (EMAT) for bulk waves has been studied by examining the magnetic-field dependence of the wave amplitudes. A spiral elongated coil placed on a thin plate of low carbon steel excites and receives the longitudinal and the shear waves propagating in the thickness direction in the presence of the bias magnetic field. The field dependences of the bulk-wave amplitudes are measured using the electromagnetic acoustic resonance both for the normal and tangential bias fields, which showed different features, depending on the bias-field direction and the wave mode. A two-dimensional model is presented for the explanation of the observed results. The present analysis emphasizes the inclined total field in the derivation of the magnetostriction constants, which is revealed to play an essential role for the wave generation. Both the measurement and the model analysis conclude that the magnetostrictive effect dominates the EMAT phenomena for the bulk waves in ferromagnetic metal, regardless of the bias field direction. (C) 1997 American Institute of Physics.