基于格型陷波器和Hilbert变换的科里奥利质量流量计信号处理方法  

Phase Difference Measuring Method Based on Adaptive Lattice Notch Filter and Hilbert Transform for Coriolis Mass Flowmeter

作　　者：林伟[1] 蔡选宪 

机构地区：[1]福州大学福建省微电子集成电路重点实验室,福州350002

出　　处：《电子器件》2014年第1期63-66,共4页Chinese Journal of Electron Devices

摘　　要：采用格型陷波器滤波和hilbert变换方法处理科里奥利质量流量计传感器的信号,能够精确的计算相位差。该方法将自适应格型滤波器和Hilbert变换结合起来,首先对信号进行滤波,得到的增强信号与其Hilbert变换通过三角运算得出相位差的时间函数,从而计算出相位差。仿真结果表明:该方法计算速度快,实时性好,无需预知信号频率,并且测量精度高,能够检测出相位差的微小变化。A high-precision phase difference method for Coriolis mass flowmeter is proposed, which is based on adaptive lattice notch filter with noise-reduction and Hilbert transform. In this method,noise-reduction is performed on the original signal firstily. Then,the phase difference time function is observed from the enhanced signal and its Hilbert transform with trigonometric operation;therefore,the phase difference obtained. Simulation results show that the method has highly computing speed and real-time,and this method does not need to know the signal frequency;beside the method has high measurement accuracy and can detect tiny phase difference change.

关 键 词：科氏流量计 相位差 格型陷波器 HILBERT变换 

分 类 号：TM814.6[电气工程—高电压与绝缘技术]