基于LabVIEW的数字式相位差测量仪的设计

Design of Digital Phase Difference Measurement Instrument Based on LabVIEW

介绍3种基于虚拟仪器的相位差测量方法:过零法、频谱分析法(FFT)、相关分析法。通过试验数据,分析了3种方法的误差来源及适用情况。与传统的硬件电路相位差测量方法相比,基于LabVIEW的数字式相位差测量仪具有测量精度高、设计灵活、电路简单等特点。

In this paper, three methods such as zero across and correlation analysis and FFT are introduced to measure phase difference based on virtual instrument. The source of measuring errors and the application scope of these three methods are analyzed through experiments. Compared with traditional ways, the instrument of digital phase difference measurement based on LabVIEW has advantages of good accuracy, flexible design and brief circuit.