铁磁材料中基于电磁声换能器的超声发射机理研究(英文)

被引：4

作者：

雷华明

阙沛文

张志钢

黄晶

机构：

[1] 上海交通大学自动检测研究所

来源：

Journal of Southeast University(English Edition) | 2004年 / 03期

关键词：

电磁声换能器; 铁磁材料; 超声发射; 电涡流; 洛伦兹力; 磁致伸缩力;

D O I：

暂无

中图分类号：

TB552 [超声换能器];

学科分类号：

摘要：

基于适当的假设和近似 ,通过分析电涡流的分布、洛伦兹力、磁致伸缩力和磁化力 ,研究了在铁磁材料中用电磁声换能器 (EMAT)的方法产生超声的耦合机理 ,并针对有实用意义的结构参数进行了数值计算以解释换能器的性能 .结果表明 :对于铁磁性材料 ,在磁场强度较低、材料磁化未达到饱和时 ,磁致伸缩效应在EMAT超声波的产生中起主导作用 ;但是 ,随着偏置磁场的逐渐增强而使材料达到磁化饱和时 ,磁致伸缩逐渐消失 ,对产生超声不再有贡献作用 ,洛伦兹力变成是激发超声的惟一原因 .因此 ,为获得优化的设计 ,计算洛伦兹力和磁致伸缩力以及选择合适的工作方式变得尤为重要 .

引用

页码：309 / 314

页数：6

共 10 条

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