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中文摘要：
电磁超声表面波换能器的换能效率较低,严重限制了其进一步的发展。为此,在建立曲折线圈型电磁超声表面波换能器多物理场有限元模型的基础上,通过仿真分析,分别从EMAT（Electromagnetic Acoustic Transducer）磁铁尺寸和线圈中导线的分布方式两个角度对电磁超声表面波换能器进行了优化。实验表明,与传统的曲折线圈型电磁超声表面波换能器相比,采用相同的磁铁体积时,在一发一收的工作模式下,文中提出的优化后的换能器接收信号幅度可提高39%;在收发一体的工作模式下,信号幅度可提高86.2%,有效地改善了换能器的性能。
英文摘要：
The low efficiency of electromagnetic acoustic transducers（ EMAT） severely confines their futher development.Therefore,on the basis of traditional meander-line-coil EMATs＇ multifield finite element model,reserch was carried out on the optimal design of the EMAT by individually studying the dimensions of the magnet and the way of distribution of the wires of the meander-line coil. Supposing the new EMAT shared the same magnet volume with the traditional ones,experiments indicated that compared with the traditional EMATs,the amplitude of the receiving signal can be improved by 39% under the pitch-catch configuration,while the amplitude of receiving signal can be improved by 86. 2% under the pulse-echo configuration,proving that the performance of the EMAT has been effectively improved.
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