Designs for improving electromagnetic acoustic transducers' excitation performance

被引：5

作者：

He, Jianpeng ^{[1
]}

Xu, Ke ^{[2
]}

Ren, Weiping ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, Natl Engn Res Ctr Adv Rolling Technol, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2018年 / 57卷 / 06期

关键词：

MODE LAMB WAVE; RAYLEIGH-WAVE; EMAT; MAGNETOSTRICTION; ENHANCEMENT; COIL;

D O I：

10.7567/JJAP.57.067202

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The main drawback of electromagnetic acoustic transducers (EMATs) is their low energy transition efficiency. For the purpose of increasing the amplitude of the received signal, a ferrite core (FC) and a bias magnet (BM) are utilized respectively to improve the EMATs excitation performance in this paper. It indicates that the new configurations can increase the peak-to-peak amplitude of the received signal by a factor of 2.7 and 2.9, respectively. The reasons for the signal enhancement are also investigated through simulation and experimental methods. For the FC EMAT, improvement is achieved due to the enhancement of the dynamic magnetic field and the increase of coil inductance. In comparison, the change of the magnetostrictive transduction mechanism leads to the signal enhancement for the BM EMAT. The bias magnet magnetized the surface of the steel plate, which changes the signal excitation mechanism from domain wall movement to reversible domain rotations. (C) 2018 The Japan Society of Applied Physics

引用

页数：6

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