基于FPGA的科氏质量流量计数字闭环系统设计  

Design of Digital Closed Loop System of Coriolis Mass Fowmeter Based on FPGA

作　　者：田婧[1] 樊尚春[1] 郑德智[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《仪表技术与传感器》2009年第B11期381-383,392,共4页Instrument Technique and Sensor

基　　金：863计划先进制造技术领域项目(2008AA 042207).

摘　　要：设计一种科氏质量流量计(Coriolis mass flowmeter,CMF)数字闭环系统,实现CMF稳定闭环工作条件。采用高速数字电路以及现代信号处理技术取代了传统的模拟正反馈系统来实现CMF闭环控制,使CMF测量管稳定维持在简谐振荡状态。利用模拟数字转换电路(A/D)将传感器输出的信号完整采样,借助现场可编程器件(FPGA,FieldProgrammable Gate Array)对信号进行分析与处理,根据信号特性进行相应的数字滤波、幅值解算,实现CMF闭环系统的幅值增益和相位的精确控制。实验结果表明:该数字闭环系统具有动态特性好、稳定性好等优点。Adigital closed loop system for Coriolis Mass Flowmeter （CMF） was introduced to realize stable closed-loop running condition. The high speed digital circuits and digital signal processing methods were used to realize closed-loop control, and maintain flow tube oscillation instead of conventional analog positive feedback system. Analog to digital converter （A/D） was uti- lized to sample the whole signals of the sensor. The sample data were analyzed and processed by the field-programmable gate array （FPGA）. Classical signal processing method was used to filter the sample data and control the amplitude and phase position, which achieves accurate controlling of amplitude and phase position in the CMF closed loop system. The experimental results show that the dynamic response and stability of the system is improved. Furthermore, the resulting meter is able to maintain the operation in more difficult process conditions.

关 键 词：科氏质量流量计 闭环系统 现场可编程器件 数字信号处理 

分 类 号：TH814.6[机械工程—仪器科学与技术]