Modeling and design of transducers for electromagnetic generation of acoustics (EMAT) incorporating permeable structures
Modeling and design of transducers for electromagnetic generation of acoustics (EMAT) incorporating permeable structures
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结合渗透结构的电磁声学 (EMAT) 换能器的建模和设计
DOI：
10.1121/1.2023981
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发表时间：
1986
影响因子：
2.4
通讯作者：
W. Imaino
中科院分区：
文献类型：
--
作者：
W. Imaino
作为一种可能的手段，提高电-声转换效率，以及提高空间分辨率，我们已经研究了换能器的性能特性的电磁产生的声学（EMAT），包括可渗透的磁性结构（可渗透的EMAT）。由于这项研究的目的是为非接触式扫描应用开发高空间分辨率的EMAT，我们称之为EMAT显微镜，因此基本设计准则与更传统的EMAT设计中所采用的设计准则有所不同，例如脉冲回波应用。已经开发了一个计算机程序，用于计算任意候选设计的磁场、感应电流和产生的力，同时严格考虑结构本身感应电流引起的杂散场以及渗透结构的各向异性极化。即使是非常简单的结构上的计算结果表明，可以实现的电声转换效率和空间分辨率的增强，虽然在工作带宽的代价。
As a possible means for increasing the electrical to acoustical conversion efficiency as well as enhancing the spatial resolution, we have investigated the performance characteristics of transducers for electromagnetic generation of acoustics (EMATs) that incorporate permeable magnetic structures (permeable EMAT). Since the intent of this investigation is to develop high spatial resolution EMATs for noncontact scanning applications, what we term EMAT microscopy, the basic design guidelines differ somewhat from those employed in the design of more conventional EMATs, as used in pulse‐echo applications, for example. A computer program has been developed, to calculate the magnetic fields, induced currents, and generated forces, of arbitrary candidate designs, taking into strict account the stray fields due to the induced currents in the structure itself, and the anisotropic polarization of the permeable structure. The results of our calculation on even very simple structures show that an enhancement of the electrical to acoustic conversion efficiency and spatial resolution can be achieved, although at the expense of operating bandwidth.