Optimal design of EMAT transmitters |
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Authors: | Koorosh Mirkhani Chris Chaggares Chris Masterson Maciej Jastrzebski Tomas Dusatko Anthony Sinclair Reza Jafari Shapoorabadi Adalbert Konrad Marcello Papini |
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Affiliation: | a Department of Mechanical and Industrial Engineering, University of Toronto, 5 Kings College Road, Toronto, Ont. M5S 3G8, Canada;b Edward S. Rogers Sr Department of Electrical and Computer Engineering, University of Toronto, 10 Kings College Road, Toronto, Ont. M5S 3G4, Canada;c Department of Mechanical, Aerospace and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ont. M5B 2K3, Canada |
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Abstract: | A three-part finite element model is developed that characterizes the ultrasonic pulse produced by an electromagnetic acoustic transducer (EMAT). The model represents several significant improvements over previously published works, as follows: (a) spatial inhomogeneities in the magnetic flux density are calculated and then incorporated in the determination of body forces, (b) an improved model of the electromagnetic induction phenomenon is formulated, allowing a more accurate evaluation of the ultrasonic pulse launched by an EMAT transmitter and (c) results from the model are compared directly with experimental measurements, yielding discrepancies of the order of 15% in the amplitude of the ultrasonic pulse. The new model is used to optimize the design of the EMAT system. In particular, a parametric study was conducted on the effects of varying an EMAT's magnet-to-coil width ratio. For the EMAT configuration considered, significant improvements can be achieved in the ultrasonic beam amplitude and profile by increasing the ratio to about 1.2; further increases in magnet dimensions yield only marginal improvements in the ultrasonic beam, at the cost of excessive EMAT size. |
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Keywords: | Author Keywords: EMAT Transolver Finite element modeling Wave propagation Ultrasonic modeling |
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