Half-space radiation by EMATs | Zendy

W. J. Pardee | Zendy; R. B. Thompson | Zendy

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Half-space radiation by EMATs

Author(s) -

W. J. Pardee,

R. B. Thompson

Publication year - 1980

Publication title -

journal of nondestructive evaluation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.513

H-Index - 43

eISSN - 1573-4862

pISSN - 0195-9298

DOI - 10.1007/bf00567089

Subject(s) - physics , electromagnetic acoustic transducer , acoustic radiation force , electromagnetic coil , magnet , radiation , lorentz force , near and far field , acoustics , magnetic field , optics , mechanics , classical mechanics , computational physics , ultrasonic testing , quantum mechanics , ultrasonic sensor , ultrasound

A Green's function calculation of the far-field radiation patterns of EMATs is presented. The approach is based on (a) closed form expressions for the eddy current and static magnetic field distributions, established by the EMATs, which react to produce the driving Lorentz forces, and (b) a Green's function derived from the steepest descent approximation to the far-field response of an arbitrary surface point force on a half space. Numerical results are presented, illustrating the radiation patterns of the three common EMAT designs. Included are vertically polarized shear waves as radiated by both meander coil and periodic magnet EMATs and horizontally polarized shear waves as radiated by the latter.

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