3D finite element analysis of electromagnetic ultrasonic transducers

Analyzing the working process of the electromagnetic ultrasonic transducer (EMAT) which involves intercoupling and transforming between electrical field, magnetic field, force field and acoustic field, it contains many variables, especially in the acoustic field analysis. Through simulating the EMAT with the finite element method (FEM) of ANSYS, it obtains the main features and distribution regularities of the electrical field, magnetic field and force field in the transduction process of the EMAT. It builds the acoustic model by the coupling analysis between electromagnetic and structural model, and then it analyzes the acoustic field distribution and directionality rule of the surface wave (SW) in the test piece. The simulation results are consistent with the theory analysis.