Different from conventional eddy current testing, the exciting coil was fed by a current pulse in PEC, the time domain transient response signal was analyzed.

• 与传统涡流不同,脉冲涡流用一个脉冲电流来激励线圈,对检测探头感应的时域瞬态响应信号进行分析,选用信号的峰值、过零时间和峰值时间来对裂纹进行定量检测。