基于LabVIEW设计了相位差的检测程序，采用相关法、过零法、FFT法、频谱分析法四种方法，适合毕业设计。-LabVIEW design phase of the testing procedures, the use of correlation, zero-crossing method, FFT method, spectral analysis of four methods for graduation design.

分析测量信号的FFT功率谱及功率谱密度，比较两者之间的差异-FFT power spectrum and power spectral density analysis comparing the measured signal difference between the two,