A two-stage finite element model of a meander coil electromagnetic acoustic transducer transmitter

Dhayalan, R.; Balasubramaniam, Krishnan

doi:10.1080/10589759.2010.511220

Cited by 36 publications

(14 citation statements)

References 25 publications

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“…An EMAT sensor typically consists of a permanent magnet providing a large static magnetic field and a coil carrying an alternating current which is placed next to the test piece [19][20][21]. There are two EMAT interactions which can produce ultrasound: magnetostriction for magnetic materials and the Lorentz force mechanism for conducting metallic materials [18,20,22]. Because an EMAT generates ultrasonic waves directly into the testing piece instead of coupling through the transducer, an EMAT has advantages in applications where surface contact is not possible or desirable [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Some papers combine the finite element method (FEM) and 2 the analytical method to model EMAT; that is, the finite element method (FEM) is used to carry out electromagnetic simulation and the analytical method is to achieve ultrasonic simulation [30][31][32][33]. Some papers model EMAT arrays with the finite element method (FEM) for both electromagnetic and ultrasonic simulations, that is, the implicit finite element software COMSOL for the electromagnetic simulation and the explicit finite element software Abaqus for the ultrasonic simulation [18,22]. The summary of the state of the art methods used for EMAT modelling is shown in Table 1; the method combining finite element method (FEM) and finitedifference time-domain (FDTD), the method wholly using analytical solutions, and the method combining the analytical method and the finite-difference time-domain (FDTD) method to model EMAT arrays have not been studied before.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

et al. 2016

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Previously, we developed a method based on FEM and FDTD for the study of an Electromagnetic Acoustic Transducer Array (EMAT). This paper presents a new analytical solution to the eddy current problem for the meander coil used in an EMAT, which is adapted from the classic Deeds and Dodd solution originally intended for circular coils. The analytical solution resulting from this novel adaptation exploits the large radius extrapolation and shows several advantages over the finite element method (FEM), especially in the higher frequency regime. The calculated Lorentz force density from the analytical EM solver is then coupled to the ultrasonic simulations, which exploit the finite-difference time-domain (FDTD) method to describe the propagation of ultrasound waves, in particular for Rayleigh waves. Radiation pattern obtained with Hilbert transform on time-domain waveforms is proposed to characterise the sensor in terms of its beam directivity and field distribution along the steering angle, which can produce performance parameters for an EMAT array, facilitating the optimum design of such sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

et al. 2016

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“…There are two EMAT interactions which can produce ultrasound: the magnetostriction mechanism and the Lorentz force mechanism; both the magnetostriction mechanism and the Lorentz force mechanism are for ferromagnetic materials while only the Lorentz force mechanism is for conductive metallic materials [16,18,19]. In this paper, only EMAT based on Lorentz force mechanism to generate Rayleigh waves is discussed.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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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.

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“…Some papers model EMAT arrays with the finite element method (FEM) for both electromagnetic and ultrasonic simulations, that is, the implicit finite element software COMSOL for the electromagnetic simulation and the explicit finite element software Abaqus for the ultrasonic simulation [17,25]. The summary of the state of the art methods used for EMAT modelling is shown in Table 1; the method combining finite element method (FEM) and finite-difference time-domain (FDTD) proposed by authors has been published in [41], the method combining the analytical method and the finite-difference time-domain (FDTD) proposed by authors has been published in [42], and the method wholly using analytical solutions to model EMAT arrays have not been studied before.…”

Section: Introductionmentioning

confidence: 99%

“…An EMAT sensor typically consists of a permanent magnet providing a large static magnetic field and a coil carrying an alternating current which is placed next to the test piece [22][23][24]. There are two EMAT interactions which can produce ultrasound: magnetostriction for magnetic materials and the Lorentz force mechanism for conducting metallic materials [17,23,25]. Because an EMAT generates ultrasonic waves directly into the testing piece instead of coupling through the transducer, an EMAT has advantages in applications where surface contact is not possible or desirable [26,27].…”

Section: Introductionmentioning

confidence: 99%

A wholly analytical method for the simulation of an electromagnetic acoustic transducer array

Xie

Yin

Sergio

et al. 2016

JAE

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This paper presents a wholly analytical method which combines electromagnetic and ultrasonic simulations for the study of an Electromagnetic Acoustic Transducer Array (EMAT). Analytical solutions to the eddy current problem for the meander coil used in an EMAT are adapted from the classic Deeds and Dodd solution, which was originally intended for circular coils. The analytical solution resulting from this novel adaptation exploits the large radius extrapolation and shows several advantages over the finite element method (FEM), especially in the higher frequency regime. The calculated Lorentz force density from the EM solver is then coupled to the ultrasonic simulations, which exploit an analytical solution for generating the distribution of surface waves. Beam features are studied, which can produce performance parameters for an EMAT array, facilitating the optimum design of such sensors. This total analytical approach to an EMAT simulation has not been reported previously to our knowledge. 2

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A two-stage finite element model of a meander coil electromagnetic acoustic transducer transmitter

Cited by 36 publications

References 25 publications

Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

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

A wholly analytical method for the simulation of an electromagnetic acoustic transducer array

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