Phase difference measurement of low-frequency sinusoidal signals based on LabWindows/CVI

In this paper, a method of measuring phase difference between low-frequency sinusoidal signals is proposed. The measurement method mainly contains two parts: simultaneous acquisition of sinusoidal signals and digital correlation analysis. And a virtual instrumentation system based on LabWindows/CVI is developed and a phase adjustable dual channel function signal generator is employed in the experiments in order to verify the validity of the measurement method. The experimental results show that the phase difference measurement system has the characteristics of simplicity, convenience and accurate, and the design scheme and performance of the system proposed in this paper may be taken as technical references for the planning and designing of other phase difference measurement systems.