基于动节流流量计变送器的研究与设计  

Research and Design of Transmitters Based on Throttle Flow Meter

作　　者：丁建梅[1] 张祥兵 王海[1] 

机构地区：[1]东北林业大学机电工程学院,哈尔滨150040 [2]上海飞机制造有限公司,上海200436

出　　处：《森林工程》2015年第5期72-77,共6页Forest Engineering

基　　金：黑龙江省科技攻关项目(GC03A523)

摘　　要：为准确测得流量计中的流量信号,设计半桥双臂惠斯通转换电路,此电路能适合远距离传输4-20 mA标准电流传送信号。且能在电桥部分考虑硬件非线性补偿,在数据处理阶段也能进行非线性补偿,还可以起到温度补偿的作用。在解决实际阻值与理论值存在差距导致惠斯通电桥在零输入的状态下输出不为零时,电桥中采用了多圈可调电位器。实现对电压信号进行放大、滤波处理,并且通过调零,获得更加准确的流量信号。最后经标定平台对变送器转换后信号的标定,实验结果表明流量计的精度能达到工业等级1.5级。In order to meter the flow signal accurately,the wheatstone bridge arms conversion circuit is designed,which is suitable for long-distance transmission 4 - 20 mA standard current transmission signal and considers the nonlinear compensation of hardware in the bridge section. The circuit can also play the role of temperature compensation in the data processing stage. In the state of zero input,a multi-turn potentiometer is adopted to obtain more accurate flow signals for that the voltage signal is amplified and filtered.Finally,the transformed signals by transmitter are calibrated by calibration platform. The results show that the accuracy of the meter can achieve industrial-grade 1. 5.

关 键 词：流量计 信号变送器 惠斯通电桥 传感器 

分 类 号：S776[农业科学—森林工程]