Simulation and experimental verification of a meander-line-coil electromagnetic acoustic transducers (EMATs)

This paper presents a method combing analytical and finite-difference time-domain (FDTD) methods to build meander-line-coil EMATs. Lorentz force densities are calculated using analytical solutions adapted from classic Deeds and Dodd solution, which then are imported to ultrasonic simulations. The propagation of ultrasound waves is numerically simulated using finite-difference time-domain (FDTD) method to describe their propagation within homogenous medium and their scattering phenomenon by cracks. Experiments are set up to verify the proposed method.

[1]  Moon Ho Park,et al.  Ultrasonic inspection of long steel pipes using Lamb waves , 1996 .

[2]  C. Dodd,et al.  ANALYTICAL SOLUTIONS TO EDDY--CURRENT PROBE COIL PROBLEMS. , 1968 .

[3]  H. Ogi,et al.  EMATs for Science and Industry: Noncontacting Ultrasonic Measurements , 2010 .

[4]  Zhichao Li,et al.  A Novel Method for Modeling and Analysis of Meander-Line-Coil Surface Wave EMATs , 2010, LSMS/ICSEE.

[5]  Kenneth T. V. Grattan,et al.  Electromagnetic acoustic transducers for in- and out-of plane ultrasonic wave detection , 2008 .

[6]  Wuliang Yin,et al.  Thickness measurement of non-magnetic plates using multi-frequency eddy current sensors , 2007 .

[7]  Wuliang Yin,et al.  Thickness Measurement of Metallic Plates With an Electromagnetic Sensor Using Phase Signature Analysis , 2008, IEEE Transactions on Instrumentation and Measurement.

[8]  Krishnan Balasubramaniam,et al.  A hybrid finite element model for simulation of electromagnetic acoustic transducer (EMAT) based plate waves , 2010 .

[9]  Lei Kang,et al.  Enhancement of signal amplitude of surface wave EMATs based on 3-D simulation analysis and orthogonal test method , 2013 .

[10]  Krishnan Balasubramaniam,et al.  A two-stage finite element model of a meander coil electromagnetic acoustic transducer transmitter , 2011 .

[11]  Zenghua Liu,et al.  Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD , 2016, J. Sensors.

[12]  Lei Kang,et al.  Influence of Coil Parameters on Rayleigh Waves Excited by Meander-Line Coil EMATs , 2012 .

[13]  K. Grattan,et al.  A model for pulsed Rayleigh wave and optimal EMAT design , 2006 .

[14]  Zenghua Liu,et al.  Simulation of ultrasonic and EMAT arrays using FEM and FDTD. , 2016, Ultrasonics.

[15]  S B Palmer,et al.  High accuracy non-contact ultrasonic thickness gauging of aluminium sheet using electromagnetic acoustic transducers. , 2001, Ultrasonics.

[16]  Qi Zhang,et al.  Ultrasonic signal identification by empirical mode decomposition and Hilbert transform , 2005 .