科氏流量计相位差检测方法的改进

Improvement of Phase Difference Detection Method of Coriolis Flowmeter

在检测科氏流量计2路振动信号的相位差时,常用的方法有相关函数法、傅里叶变换法等,这些方法或精度不高,或需要整周期采样,或计算量大。为此,首先对科氏流量计实验系统进行建模,然后结合最小二乘和曲线拟合的思想,改进相位差检测方法,结果表明在不降低检测精度的前提下,不需要整周期采样,显著减小了计算量,并通过仿真与单相流实验证明该方法简单、实用、计算效率高,为科氏流量计数据处理提供了新的方法。

When detecting the phase difference of two vibration signals of Coriolis flowmeter,the commonly used methods include correlation function method and Fourier Transformation method.And among these methods,some of them are with low accuracy,and some of them require entire-cycle sampling,and others maybe large calculation-demanding. To solve this problem,the Coriolis flowmeter experimental system was modeled firstly,and then the phase difference detection method was built based on least squares and curve fitting.The results show that this method can reduce the amount of calculation significantly without reducing the detection accuracy or adjusting the entire-cycle sampling. The simulation and single phase flow experiment indicate that this method is simple,practical and efficient,and it provides a new method for data processing of Coriolis flowmeter.