基于加窗DFT在科氏流量计信号处理中的应用

Implementation of Coriolis mass flowmeter in signal processing based on windowed DFT

科里奥利质量流量计是一种直接测量质量流量的流量计,针对其对相位差估计精度的要求,采用一种基于加窗离散傅里叶变换(DFT)的相位差测量算法进行研究。该算法不需要整周期采样,可应用于含有谐波的信号。与传统的相位差估计算法进行仿真对比研究,通过分析噪声对估计精度的影响,研究一种改善估计精度的方法。仿真结果表明,该算法实用性好,满足科氏流量计对精度的要求。

Coriolis mass flowmeter is used for direct measurement of mass flow. Aiming at the requirement of the estimation accuracy of phase difference,a phase difference measurement algorithm is studied,which is based on windowed discrete Fourier transform（DFT）. There is no need to sample for the entire cycle time,and can be applied to signals with harmonics. Compared with the traditional phase estimation method,through analyzing the impact of noise on the estimation accuracy,a method to im-prove the estimation accuracy is studied. The experimental results show that the method has good effectiveness,and can meet the accuracy requirements of Coriolis mass flowmeter.