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Modeling of Lorentz forces and radiated wave fields for bulk wave electromagnetic acoustic transducers
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10.1063/1.4817085
/content/aip/journal/jap/114/5/10.1063/1.4817085
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/5/10.1063/1.4817085
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Structure diagram of the bulk wave EMAT.

Image of FIG. 2.
FIG. 2.

Axisymmetric structures of EMATs in cylindrical coordinate system with (a) a delta function coil and (b) a spiral coil. The current densities of the currents are .

Image of FIG. 3.
FIG. 3.

Axisymmetric structure of the static magnetic field in cylindrical coordinate system with (a) a delta function current of and (b) a current loop of . The current loop k is around the side face and along the circumferential direction of the permanent magnet.

Image of FIG. 4.
FIG. 4.

Eddy-current along the r axis in the surface of sample when we consider the permanent magnet or not.

Image of FIG. 5.
FIG. 5.

Lorentz forces along the r axis in the surface of sample: the forces generated by (a) static magnetic fields and (b) dynamic magnetic fields.

Image of FIG. 6.
FIG. 6.

Multi-types of radiated wave field distribution radiated by the Lorentz forces generated by static magnetic fields, which are and .

Image of FIG. 7.
FIG. 7.

Displacement ratios at different liftoffs of magnet , with respect to the ratios of the magnet radius to coil radius.

Image of FIG. 8.
FIG. 8.

Multi-types of the radiated wave field distribution radiated by Lorentz forces generated by dynamic magnetic fields, which are and .

Image of FIG. 9.
FIG. 9.

Comparisons of the displacements between the present model and FEM software. The displacements are provided by (a) and (b) at the frequency of 2 MHz.

Image of FIG. 10.
FIG. 10.

Schematic diagram of the experiment system for measurement of the radiated wave distributions.

Image of FIG. 11.
FIG. 11.

Comparisons between measured voltages and calculated displacements along the axis for the EMATs (a) with permanent magnet and (b) without permanent magnet.

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/content/aip/journal/jap/114/5/10.1063/1.4817085
2013-08-02
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modeling of Lorentz forces and radiated wave fields for bulk wave electromagnetic acoustic transducers
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/5/10.1063/1.4817085
10.1063/1.4817085
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