电磁流量计应用中的信号基准与直流噪声  

The Signal Criterion and Direct Current Noise in Application of Electromagnetic Flowmeter

作　　者：孟令军[1] 

机构地区：[1]东北大学信息工程学院,沈阳110006

出　　处：《自动化仪表》2003年第2期13-16,共4页Process Automation Instrumentation

摘　　要：电磁流量计的流量信号是以流体为基准的。正确拾取基准电位 ,关系到流量计能否稳定、可靠、准确地进行流量测量 ,电解质流体与金属管道和测量电极存在电化学作用 ,总会有直流极化电压在其上产生。分析了直流极化电压作为噪声 ,影响信号基准电位的原因 。The flow signal of electromagnetic flowmeter is based on fluid criterion. Properly picking up standard potential is related to if the measurement of flowmeter will be stable,reliable and accurate or not.Electrochemical actions exist between dielectric fluid and metal pipeline and measuring electrode,thus direct current polarized voltage,i.e., direct current noise,is caused.The reason of the effect of noise on signal criterion is analyzed.The method of resolving the drift caused on direct current polarized voltage is introduced to users.

关 键 词：电磁流量计 信号基准 直流噪声 极化电压 共模干扰 

分 类 号：TH814.93[机械工程—仪器科学与技术]