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Optimization of bias magnetic circuit in EMAT for steel plates inspection
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To optimize the structure of electromagnetic acoustic transducer (EMAT) and improve transduction efficiency, the model of the EMAT for inspection of steel plates was firstly established based on the multiphysics field FEM, and the effect of bias magnet dimensions on magnetostrictive strain were simulated and analyzed, the magnetic force between the transducer and the steel plate were also calculated simultaneously. Moreover, the simulation results were verified by experiments with the help of a self-developed EMAT guided-wave system. The results indicate that variation in the magnet width affects the transduction efficiency much more than variation in the magnet thickness, and that the transducer can reach a trade-off between detection sensitivity and the magnetic force when the bias magnet is about 20 mm wide and 15 mm thick.
Title: Optimization of bias magnetic circuit in EMAT for steel plates inspection
Description:
To optimize the structure of electromagnetic acoustic transducer (EMAT) and improve transduction efficiency, the model of the EMAT for inspection of steel plates was firstly established based on the multiphysics field FEM, and the effect of bias magnet dimensions on magnetostrictive strain were simulated and analyzed, the magnetic force between the transducer and the steel plate were also calculated simultaneously.
Moreover, the simulation results were verified by experiments with the help of a self-developed EMAT guided-wave system.
The results indicate that variation in the magnet width affects the transduction efficiency much more than variation in the magnet thickness, and that the transducer can reach a trade-off between detection sensitivity and the magnetic force when the bias magnet is about 20 mm wide and 15 mm thick.
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