中文摘要：

不同于传统的谐波激励的涡流检测方法,脉冲涡流检测采用方波或阶跃方式激励,其测量的是涡流在构件中的衰减。由傅里叶理论可知,脉冲涡流激励中包含多种频率成分,根据电磁场理论,低频电磁波有更深的穿透深度,因而也就可能检测出更深的缺陷。由于脉冲涡流检测时,激励已经停止,因而传统涡流阻抗分析方法已经不适用于脉冲涡流检测信号分析,需要寻找新的信号处理方法或数据解释方法;同时由于导磁材料与非导磁性材料特性不同,信号特性差异极大,上述问题不论从理论上还是从工程上对脉冲涡流检测技术都提出了极大的挑战。从检测理论模型、传感器、信号处理方法及工程应用等方面,对脉冲涡流检测技术作论述,指出该技术进一步发展需要研究的问题,更好地推动脉冲涡流检测技术的发展。

英文摘要：

Different from the traditional eddy current （EC） testing technology, the pulsed eddy current （PEC） technology which measures the decay of eddy current in the specimen is powered by a square wave or a step wave. By using the Fourier transform, the PEC current signal can be discretized into an infinite train of sinusoidal waveforms. In consideration of the skin effect of the electromagnetic field, it is noticeable that PEC can implement the inspection of a defect in the infinite depth. Because of the difference of excitation methods, methods used for signal analysis in the EC testing may not be suitable for the PEC testing, and new ones should be developed. Furthermore, signals obtained from the magnetic materials and nonmagnetic materials are very different, which bring new challenges for the PEC testing both in theoretical analysis and engineering application. Focused on the application of PEC testing for aircraft lap-joints and pressure-bearing equipments, models, signal analysis methods and applications of the PEC testing technology are discussed, in order to take a better development in PEC testing.