涡流检测对某一被测量的检测灵敏度很大程度上依赖于试验频率。文章提出了一种基于频谱分析的涡流探头最佳试验频率获取方法，设计了数字化涡流阻抗检测系统。在该系统中，激励信号具备扫频输出和单频输出功能，探头检测信号拾取后数字化分解为实部和虚部。借助该系统，可方便、快捷、实时地获取每一探头的阻抗频谱，根据实际需要分析获得最佳试验频率。

The detection sensitivity of eddy current testing is dependent on operating frequency. In this paper, a method was presented to determine the best operating frequency of eddy current testing based on spectrum analysis, and the digital eddy current impedance inspection system was designed .In this system, the excitation signal with the frequency sweep output and single output was developed, and the probe signal was picked up and demodulated for the real and imaginary parts, The real-time impedance spectrum of each probe can be swiftly accessed with the system, so the best operating frequency can be determined according to actual needs.