对多频涡流与脉冲涡流两种不同的电磁无损检测技术的基本原理分别进行了介绍，进而从脉冲涡流的傅里叶展开式中分析了两者间的关系。指出脉冲涡流检测技术本质上等同于一种衰减型的多频涡流检测技术，而多频涡流可以认为是高频加权的脉冲涡流形式。对这两种涡流检测技术在实际生产中的应用进行了简单介绍。随着涡流检测理论的深入研究,电子技术与计算机技术的迅速发展，多频涡流和脉冲涡流检测技术将成为涡流检测的重要组成部分。

The basic principles of two different eddy current testing techniques, the multi-frequency eddy current and pulsed eddy current testing techniques, are introduced and the relationship between them is presented from the Fourier series of the pulsed input signal. It is indicated that the pulsed eddy current testing technique is equal an attenuation type of multi-frequency eddy current testing in nature. Whereas the multi-frequency eddy current testing could be regard as a high frequency weighted pulsed eddy current testing. Some industry applications of these two eddy current testing techniques are shown. With the developments of eddy current theories and the electronic and computer techniques, the multi-frequency eddy current and pulsed eddy current testing techniques will play more and more important roles in eddy current testing.