3种瞬态电磁流量测量方法的温度影响分析  

Temperature Impact Analysis of Three Transient Electromagnetic Flow Measurement Methods

作　　者：熊伟 徐科军[1,2] 吴建平[1] 许伟[1] 于新龙 闫小雪 XIONG Wei;XU Ke-jun;WU Jian-ping;XU Wei;YU Xin-long;YAN Xiao-xue(School of Electrical and Automation Engineering,Hefei University of Technology,Hefei,Anhui 230009,China;Engineering Technology Research Center of Industrial Automation,Hefei,Anhui 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]工业自动化安徽省工程技术研究中心,安徽合肥230009

出　　处：《计量学报》2021年第1期46-52,共7页Acta Metrologica Sinica

摘　　要：从测量原理角度分析了环境温度变化对3种瞬态电磁流量测量方法的影响,发现电压电流比值、电压电流微分法受环境温度变化的影响较大,而微分干扰补偿方法本身对环境温度变化具有很好地抑制能力。针对微分干扰补偿方法在实用化的过程中可能会导致误差增大的情况,给出了微分干扰系数的最佳计算方法和励磁频率的最优选择方案。通过水流量标定实验证实,微分干扰补偿方法在环境温度变化不超过±20℃范围内,对环境温度变化具有较好的补偿作用,流量测量结果均能满足0.5级的精度要求。From the perspective of measurement principle,the influence of ambient temperature change on three kinds of transient electromagnetic flow measurement methods is analyzed. It is found that the voltage-current ratio and voltagecurrent differential method are greatly affected by the change of ambient temperature,while the differential interference compensation method itself has a good ability to suppress ambient temperature change. In view of the fact that the differential interference compensation method may cause errors to increase in the process of practicality,the optimal calculation method of differential interference coefficient and the optimal selection of excitation frequency are given. It is confirmed by the water flow calibration experiment that the differential interference compensation method has a better compensation effect on the ambient temperature changes when the variation of the ambient temperature does not exceed± 20℃,and the flow measurement results can meet the accuracy requirements of 0. 5 level.

关 键 词：计量学 电磁流量计 温度影响 瞬态测量 

分 类 号：TB937[一般工业技术—计量学]