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Theory and numerical calculation of the acoustic field produced in metal by an electromagnetic ultrasonic transducer

 

作者: Katsuhiro Kawashima,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1976)
卷期: Volume 60, issue 5  

页码: 1089-1099

 

ISSN:0001-4966

 

年代: 1976

 

DOI:10.1121/1.381208

 

出版商: Acoustical Society of America

 

关键词: 3560;8548

 

数据来源: AIP

 

摘要:

The equations for calculating the acoustic field produced within a nonmagnetic metal by an interaction of eddy current with a static magnetic field were obtained on the assumptions that (1) an ultrasonic wave is generated by the electromagnetic force through classical and macroscopic phenomena; (2) the electric, magnetic, and elastic properties of the metal are linear, isotropic, and homogeneous throughout the metal, which occupies semi‐infinite space; (3) the whole system is axially symmetric; and (4) eddy currents and elastic waves show a steady‐state sinusoidal variation. The acoustic field produced by a specific electromagnetic ultrasonic transducer with axial symmetry was calculated numerically, and the results showed a well‐defined ultrasonic wave beam, which was narrower than had been expected from the size of the transducer.Subject Classification: [43]35.60; [43]85.48.

 

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