利用DFT技术实现同频率周期信号相位差的高精度测量

本文提出了一种利用离散傅立叶变换(DFT)技术实现两频率相同的周期信号相位差高精度测量的方法。即使存在高次谐波的严重干扰,亦能精确测得两信号的基波相位差。采用同步采样技术,根本消除了DFT的泄漏效应。文中给出了实验结果及分析。本文提出的这种测量方法,特别适合于被测信号被高次谐波噪声严重污染的实际工业测试场合。

A high precision measuring method by using the DFT technology to realize the phase difference of periodic signals with the same frequency

This paper discusses a new method for measuring the phase difference between two periodic signab of the same frequency. This method uses Discrete Fourier Transform(DFT). It can be used to measure the fundimental phase difference between accurately even there is higher-degree harmonic interference. By adopting the synchronous sampling technology, this method has removed the leakage effect that exists in DFT. The results of experiment are given. The method is especially suitable for signals which are disturbed by higher-degree harmonics in industrial measuring application.