脉冲涡流检测技术作为当前无损检测的一种新技术，能够快速方便地检测金属导体构件中的缺陷。与传统的单频涡流技术相比，宽频谱的脉冲信号激励使得响应信号中包含了更丰富的缺陷信息。对不同深度的表面缺陷进行了检测，分析了差分信号的特征值与缺陷深度之间的关系，试验表明利用峰值不仅可以判断缺陷位置，而且还与缺陷的深度之间呈线性关系。并对一阶微分信号的特征进行了分析，结果发现，采用一阶微分信号分析可提高脉冲涡流检测系统的线性度。

The pulsed eddy current testing technology is a new branch of the eddy current nondestructive testing and can detect the defect in the metal conductor equipments quickly and easily. Comparing with the conventional single-frequency eddy current technology, the pulsed eddy current contains more flaw feature information in its response signal because of its wider frequency spectrum. Different depths of surface defects were detected and the relationship between the characteristics of the differential signal and the depth of the defects was analyzed, the experiment showed that peak value not only detected the location of the defects, but also indicateed the depths of the defects. Analyzing the characteristics of the first derivative signal, the result illuminated that it was possible to enhance linearity of the pulse eddy current testing system using the peak value of the first derivative signal.