电磁超声换能器在金属板厚度检测中的优化  

Optimization of electromagnetic acoustic transducer for thickness detection of metal plate

作　　者：杨理践[1] 臧慧[1] 高松巍[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2013年第5期535-540,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(60927004;61141004);十二五国家科技部支撑计划资助项目(2011BAK06B01-03)

摘　　要：为了提高电磁超声换能器(electromagnetic acoustic transducer,EMAT)在金属板厚度检测中的换能效率,利用ANSYS有限元软件对用于铝板厚度检测的电磁超声横波换能器进行三维建模与仿真.在仿真过程中,确定了电磁超声横波在铝板中的传播形状与方向,并以正交试验优化设计方法为指导,研究了电磁超声换能器的不同因素、不同尺寸对其换能效率的影响,并据此对EMAT模型尺寸进行了优化.通过实验验证,优化后EMAT得到的回波信号幅值是原始模型回波信号幅值的5倍,并且信噪比较高.In order to improve the conversion efficiency of electromagnetic acoustic transducer （EMAT） in the thickness detection of metal plate, the 3D modeling and simulation of electromagnetic acoustic shear wave transducer used for the thickness detection of alumium plate were performed with ANSYS finite element software. During the simulation process, the transmission shape and direction of electromagnetic acoustic shear wave in the aluminum plate were determined. In addition, the influence of different factors and sizes of EMAT on its conversion efficiency was studied through taking the orthogonal test optimum design method as the guidance. And then, the model size of EMAT was optimized. It is found through the experimental verification that the amplitude of echo signal received by the optimized EMAT is five times than that obtained in the original model, and the signal-to-noise ratio is higher.

关 键 词：电磁超声 换能器 正交实验法 涡流密度 横波 厚度检测 回波信号 信噪比 

分 类 号：TB552[理学—物理]