电磁超声检测技术由于无需媒介以及与被测物体非接触，不但可提高检测效率，而且可将超声检测技术的应用扩展到高温、高速和在线检测。根据电磁超声传感器的工作原理，建立了基于有限元的电磁超声无损检测数值分析方法，开发了相应的计算程序，验证了其有效性。应用开发的电磁超声数值模拟程序，研究了不同激励方式对电磁超声波的影响，得到了相应超声波在均匀各向同性金属介质中的传播过程。该计算方法和程序为实际电磁超声检测中缺陷的定量和探头优化提供了手段。

As no physical contact is necessary between the transducer and test-piece, the electromagnetic acoustic technique(EMAT) can not only improve the inspection efficiency but also extend the application area of ultrasonic NDT to the fields of a high temperature, a high speed and on-line inspection. A finite element method for the numerical simulation of electromagnetic ultrasonic testing signals was established and the corresponding numerical code was developed. In order to prove the validity of the code, propagation behaviors of ultrasonic waves excited by transducers of different structure were investigated by using the developed code. The simulation method and code provided a useful tool for the defect sizing and transducer optimization in practical application of EMAT.