title: Directivity analysis of meander-line-coil EMATs with a wholly analytical method.
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.
authors.affiliation: School of Electrical and Electronic Engineering, University of Manchester, Manchester, United Kingdom.
authors.forename: Yuedong
authors.initials: Y
authors.lastname: Xie
authors.affiliation: College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China.
authors.forename: Zenghua
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming, China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Yin
authors.affiliation: School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming, China.
authors.forename: Jiande
authors.initials: J
authors.lastname: Wu
authors.affiliation: College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Deng
authors.affiliation: School of Electrical and Electronic Engineering, University of Manchester, Manchester, United Kingdom. Electronic address: wuliang.yin@manchester.ac.uk.
authors.forename: Wuliang
authors.initials: W
authors.lastname: Yin
keywords: Analytical solutions; Beam directivity; Electromagnetic acoustic transducers (EMATs); Modelling and simulation; Rayleigh waves