A model for pulsed Rayleigh wave and optimal EMAT design

A model has been developed for the prediction of the transient displacement of a Rayleigh wave generated by an electromagnetic acoustic transducer (EMAT), operating on the Lorentz principle. This model can be used to calculate Rayleigh waves of arbitrary forces. A linear coil and a spiral coil are c...

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Published inSensors and actuators. A. Physical. Vol. 128; no. 2; pp. 296 - 304
Main Authors Jian, X., Dixon, S., Grattan, K.T.V., Edwards, R.S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 19.04.2006
Subjects
Coiling
Displacement
Dynamic magnetic field
EMAT
Interferometers
Lorentz force
Magnetic fields
Mathematical models
Rayleigh wave
Rayleigh waves
Spirals
Transducers
43.35.Rw
43.35.Yb
43.20.Px
Dynamic magnetic field
Rayleigh wave
EMAT
Lorentz force
43.38.Dv
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Summary:A model has been developed for the prediction of the transient displacement of a Rayleigh wave generated by an electromagnetic acoustic transducer (EMAT), operating on the Lorentz principle. This model can be used to calculate Rayleigh waves of arbitrary forces. A linear coil and a spiral coil are considered as two examples. Out-of-plane displacement of the Rayleigh wave is measured experimentally using a Michelson laser interferometer. Good agreement is observed between the calculated and the measured results, demonstrating the value of this method. This paper explains how the Lorentz forces due to the static and dynamic magnetic fields work constructively and destructively, indicating that the orientation of the external magnetic field must be correct to achieve an efficient generation of the Rayleigh wave.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2006.01.048