智能涡街流量变送器  

Vortex shedding flow transducer with a minicoputer

作　　者：龚中字 

机构地区：[1]重庆市计量质量检测研究院,重庆400020

出　　处：《自动化与仪器仪表》2007年第1期63-65,81,共4页Automation & Instrumentation

摘　　要：介绍采用MSP430微功耗微处理构成的智能补偿电路及软件。该电路接受涡街流量变送器输出的脉冲fi,根据频率fi—线性度E曲线,软件采用多点线性内查补偿运算出与流量成正比的频率fic,为确保频率fic的转换精度,微处理器的定时器接受双时钟源,输出占空比为50%PWM方波,从而提高变送器的线性度及准确度。The article instroduces a apphed software aria a compensation circuit which is composed of MSP430 minicomputer with mimi-power consumption. The circuit receives pulse singnals fi which issue from vortex shedding flow transducer. According to the basics of frequency f——linearity E curve , the software adopts compensated operation by linear internal insert at muilt-points and caculates frequency fic which direct ratio with flowrate. For ensuring transform accuracy of frequency fic, minicomputer＇s timerA receives dual clokes and output PWM square waves which have 50% space percent. Therefore, transducer＇s linearity and accuracy is advanced and improved.

关 键 词：智能补偿电路 频率fi一线性度E曲线 线性内查补偿 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]