Thickness measurement of non-magnetic plates using multi-frequency eddy current sensors

Yin, Wuliang; Peyton, A. J.

doi:10.1016/j.ndteint.2006.07.009

Cited by 164 publications

(119 citation statements)

References 15 publications

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“…There are a variety of nondestructive testing (NDT) techniques employed in industries, such as magnetic particle inspection (MPI), electromagnetic methods (EM), eddy current methods, and ultrasonic methods [1][2][3][4][5][6][7]. Due to its advantages of having good penetration depth and mechanical flexibility, the piezoelectric ultrasonic method is widely used for thickness measurement, flaw evaluation, and material characterization [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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%

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

et al. 2016

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“…A variety of non-destructive testing (NDT) techniques are available in industries, such as radiographic testing (RT), magnetic particle testing (MPT), eddy current methods, magnetic flux leakage (MFL) and ultrasonic methods [1][2][3][4][5]. Due to its advantages of good penetration depth and mechanical flexibility, the piezoelectric ultrasonic method is widely used for thickness measurement, flaw evaluation and material characterization [6][7][8][9][10][11].…”

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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“…There are a variety of non-destructive testing (NDT) techniques employed in industries, such as magnetic particle inspection (MPI), electromagnetic methods (EM), eddy current methods, and ultrasonic methods [1][2][3][4][5][6][7]. Due to its advantages of having good penetration depth and mechanical flexibility, the piezoelectric ultrasonic method is widely used for thickness measurement, flaw evaluation and material characterization [8][9][10][11][12][13].…”

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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Thickness measurement of non-magnetic plates using multi-frequency eddy current sensors

Cited by 164 publications

References 15 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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