Directivity analysis of meander-line-coil EMATs with a wholly analytical method

Yuedong Xie; Zenghua Liu; Liyuan Yin; Jiande Wu; Peng Deng; Wuliang Yin

doi:10.1016/j.ultras.2016.09.016

Directivity analysis of meander-line-coil EMATs with a wholly analytical method

Ultrasonics. 2017 Jan:73:262-270. doi: 10.1016/j.ultras.2016.09.016. Epub 2016 Sep 17.

Authors

Yuedong Xie¹, Zenghua Liu², Liyuan Yin³, Jiande Wu³, Peng Deng², Wuliang Yin⁴

Affiliations

¹ School of Electrical and Electronic Engineering, University of Manchester, Manchester, United Kingdom.
² College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China.
³ School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming, China.
⁴ School of Electrical and Electronic Engineering, University of Manchester, Manchester, United Kingdom. Electronic address: wuliang.yin@manchester.ac.uk.

PMID: 27723531
DOI: 10.1016/j.ultras.2016.09.016

Abstract

This paper presents the simulation and experimental study of the radiation pattern of a meander-line-coil EMAT. A wholly analytical method, which involves the coupling of two models: an analytical EM model and an analytical UT model, has been developed to build EMAT models and analyse the Rayleigh waves' beam directivity. For a specific sensor configuration, Lorentz forces are calculated using the EM analytical method, which is adapted from the classic Deeds and Dodd solution. The calculated Lorentz force density are imported to an analytical ultrasonic model as driven point sources, which produce the Rayleigh waves within a layered medium. The effect of the length of the meander-line-coil on the Rayleigh waves' beam directivity is analysed quantitatively and verified experimentally.

Keywords: Analytical solutions; Beam directivity; Electromagnetic acoustic transducers (EMATs); Modelling and simulation; Rayleigh waves.

Publication types

Research Support, Non-U.S. Gov't