Mechanism study on electromagnetic acoustic transducer for ultrasonic generation in ferromagnetic material

作     者：雷华明 阙沛文 张志钢 黄晶 Lei Huaming;Que Peiwen;Zhang Zhigang;Huang Jing

作者机构：上海交通大学自动检测研究所上海200030 

基　　金：TheNationalHighTechnologyResearchand DevelopmentProgramofChina (863Program) (No .2 0 0 1AA60 2 0 2 1) 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2004年第20卷第3期

页      码：309-314页

摘      要：Based on the proper assumptions and approximations, the coupling mechanism of the electromagnetic acoustic transducer (EMAT) for ultrasonic generation within ferromagnetic material was studied by analyzing the eddy current distribution, Lorentz force, magnetostriction force and magnetization force. Some useful numerical calculations are presented to explain the EMAT behavior with general geometric arrangements. It is indicated that for the ferromagnetic material the magnetostriction effect dominates the EMAT phenomenon for ultrasonic wave generation in low magnetic field intensity, while the material does not reach its magnetizing saturation. But, with the increase of the bias magnetic field and saturation, the magnetostrictive terms will make no contributions to the ultrasonic generation and the Lorentz force becomes the only exciting mechanism. It is important to determine both the Lorentz and magnetostriction forces and select the appropriate working manner for achieving an optimized design.

主 题 词：Calculations Eddy currents Ferromagnetic materials Magnetization Magnetostriction Ultrasonic waves 

学科分类：0810[工学-土木类] 07[理学] 08[工学] 070206[070206] 0805[工学-能源动力学] 0802[工学-机械学] 0812[工学-测绘类] 0702[理学-物理学类] 

核心收录：

D　O　I：10.3969/j.issn.1003-7985.2004.03.009

馆 藏 号：203269790...