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Shear Wave Field Radiated by an Electromagnetic Acoustic Transducer
作者姓名:吴迪  李明轩  王小民
作者单位:Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
基金项目:Supported by the National Natural Science Foundation of China under Grant No 10234060,10574138 and 10474113.
摘    要:The horizontally polarized ultrasonic shear wave field emitted by an electromagnetic acoustic transducer (EMAT) is studied by the surface force distribution on the EMAT approximately described as an inhomogeneous horizontal shear force. The shear wave directivity pattern is plotted by numerical calculations based on our strictly analytic solutions of the wave field we presented previously. An experimental system of EMAT generation and piezoelectric transducer reception is set up to check the predictions of the theoretical wave field by measuring the ultrasonic signals through aluminium block. The directivity pattern of the wave field obtained from the experimental results conforms the theoretical prediction, which lays a foundation for engineering applications of EMATs.

关 键 词:超声剪切波场  电磁声换能器  水平极化  表面力分布  非破坏性试验
收稿时间:2006-08-22
修稿时间:2006-08-22

Shear Wave Field Radiated by an Electromagnetic Acoustic Transducer
WU Di,LI Ming-Xuan,WANG Xiao-Min.Shear Wave Field Radiated by an Electromagnetic Acoustic Transducer[J].Chinese Physics Letters,2006,23(12):3294-3296.
Authors:WU Di  LI Ming-Xuan  WANG Xiao-Min
Institution:Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
Abstract:The horizontally polarized ultrasonic shear wave field emitted by an electromagnetic acoustic transducer (EMAT) is studied by the surface force distribution on the EMAT approximately described as an inhomogeneous horizontal shear force. The shear wave directivity pattern is plotted by numerical calculations based on our strictly analytic solutions of the wave field we presented previously. An experimental system of EMAT generation and piezoelectric transducer reception is set up to check the predictions of the theoretical wave field by measuring the ultrasonic signals through aluminium block. The directivity pattern of the wave field obtained from the experimental results conforms the theoretical prediction, which lays a foundation for engineering applications of EMATs.
Keywords:43  35  +d
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