A fast analytical model of Electromagnetic Acoustic Transducers for evaluation of flat non-magnetic conductors

Simulations of electromagnetic field and the resulting Lorentz force of Electromagnetic Acoustic Transducers (EMAT) for evaluation of non-magnetic conductors are normally realized via Finite Element Modeling (FEM) which is subject to considerably high computation burden due to a large amount of meshes within the solution region. In light of this, this paper proposes an analytical model of EMAT for fast computation of electromagnetic field and Lorentz force of EMAT based on Extended Truncated Region Eigenfunction Expansion (ETREE), whilst the permanent magnet and spiral coil are taken into account. The established model is corroborated via FEM, and would benefit the design and optimization of EMAT for nondestructive evaluation of non-magnetic conductors.