一种新型的电池供电的数字流体振荡式流量计  

A Novel Battery-powered Digital Fluidic Oscillation Flow-meter

作　　者：方敏[1] 王沁[1] 徐科军[1,2] 

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》2011年第6期511-516,共6页Acta Metrologica Sinica

基　　金：国家自然科学基金（61074164）;美国德州仪器公司创新基金资助项目

摘　　要：研制了基于MSP430F5418的低功耗数字流体振荡式流量计，适配于涡街流量计和旋进旋涡流量计的一次仪表。采用数字频谱分析和带通滤波器相结合的方式，关键算法采用汇编语言和定点运算实现，保证了在低功耗情况下，最大限度地滤除流量信号中混杂的噪声信号，拓展了下限流量。根据降压型DC／DC和低压差线性稳压器的工作原理，设计了通道切换电路，实现了在不同工况下高效率的电源电压转换。依据测量需要和精度要求，温度和压力补偿模块采用间歇工作模式，进一步降低了系统的功耗。An low-power digital fluidic oscillation flow-meter based on MSP430F5418 MCU is developed, that adapted to the primary instrument of the votex flow-meter and swirl flow-meter. The solution combines the small number spectral analysis with the analog band-pass filters and the algorithm is implemented by means of the assemble language and the fixed-point calculation. All that filters the noise signal of the flow signal in as lower as possible power consumption, and extends the lower flow limit. In the light of features of DC/DC and Low Dropout Regulator（ LDO）, a switching circuit is designed to improve the efficiency of the power module. According to the requirements of measurement and precision, the temperature and pressure compensation module acquires the temperature and pressure signals in a certain time interval for reducing the power consumption of the meter.

关 键 词：计量学 流体振荡式流量计 周期图谱 带通滤波器 电源转换通道切换 间歇采样 

分 类 号：TB937[一般工业技术—计量学]