Analysis of High-Temperature Electromagnetic Acoustic Transducer Simulation and Transuction Efficiency Improvement Method

The transduction efficiency of electromagnetic acoustic transducer (EMAT), particularly in the Lorentz force mechanism, is generally low. Moreover, the factors affecting the transduction efficiency under high-temperature conditions are not fully solved. This study establishes a multi-physical finite element model for electromagnetic acoustic transducer at elevated temperatures (up to 500°C) to investigate the influence of various EMAT parameters on its transduction efficiency. The analysis identifies the reduction in excitation current amplitude at high temperatures as the predominant factor responsible for the efficiency degradation. Furthermore, a power synthesis method is proposed to compensate for this current reduction, offering a viable strategy for enhancing the transduction efficiency of EMAT operating at high temperatures.