Vol. 89, Issue 3, March 2008, pp.77-82

Analytical and Fundamental Study of EMATs System

A. Doniavi¹ , M. Eskandarzade², J. Malekani

¹University of Urmia

²Urmia University of Technology

E-mail: M.Eskandarzade@gmail.com

Received: 1 February 2008   /Accepted: 17 March 2008   /Published: 24 March 2008

Abstract: Electromagnetic Acoustic Transducers (EMATs) is one of the most important methods in NDE field that generate ultrasonic waves due to Lorentz and magnetostrictve forces. However, only the Lorentz mechanism is present in non-magnetic conducting materials. In most of the previous researches the effect of dynamic magnetic field has been neglected. Where is, it is significantly influence the wave propagation phenomena in an EMAT system. In this study have been investigated the Lorentz type EMAT system and complete equations of ultrasonic wave excitation force is derived. The developed equation shows that the dynamic component of total Lorentz force is in a different direction with static magnetic field one. And in some cases this type of force is significantly influence the total Lorentz force.

Keywords: EMATs, Acoustic, force density, Lorentz mechanism, magnetostrictve force, static magnetic field

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