Non-contact ultrasonic measurements on steel at elevated temperatures

Scruby, C. B.; Moss, Brian

doi:10.1016/0963-8695(93)90472-7

Cited by 75 publications

(37 citation statements)

References 10 publications

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“…During the austenite decomposition (from 850 to 750 • C), the velocity dependence remains almost linear, but with a different slope than that of the austenite range. For the ferritic phase (below 750 • C), the velocity follows a non-linear behavior already reported for pure iron and low carbon steels [4,[11][12][13][14] that shows a prominent inflection at the Curie temperature (about 770 • C). Fig.…”

Section: Ultrasonic Velocity and Austenite Decomposition For Plain Casupporting

confidence: 64%

Monitoring austenite decomposition by ultrasonic velocity

Kruger

Damm

2006

Materials Science and Engineering: A

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Section: Ultrasonic Velocity and Austenite Decomposition For Plain Casupporting

confidence: 64%

Monitoring austenite decomposition by ultrasonic velocity

Kruger

Damm

2006

Materials Science and Engineering: A

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“…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]. Another attractive feature of EMAT which is a variety of waves modes can be produced based on different combinations of coils and magnets [18,25].…”

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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“…For a circular coil with a rectangular cross-section over a layered conductor, [14] provided the final analytical solutions for the vector potential calculation, which can be extended to calculate other electromagnetic induction phenomenon. Assuming the conductor only has one layer (as shown in Figure 2), the solutions can be simplified as:…”

Section: Adapted Analytical Solutionmentioning

confidence: 99%

“…However, one primary disadvantage of the piezoelectric ultrasonic testing is the need to have good sonic contact with the test piece, typically by means of a couplant for acoustic impedance matching [13]. Because an EMAT generates ultrasonic waves directly into the testing piece instead of coupling through the transducer, it has advantages in applications where surface contact is not possible or desirable [14,15]. Another attractive feature of EMAT is that a variety of waves modes can be produced based on different combinations of coils and magnets [16,17].…”

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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Non-contact ultrasonic measurements on steel at elevated temperatures

Cited by 75 publications

References 10 publications

Monitoring austenite decomposition by ultrasonic velocity

Monitoring austenite decomposition by ultrasonic velocity

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

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