低功耗、两线制涡街流量计数字信号处理系统  

Digital Signal Processing System of Vortex Flow-meter with Low-power and Two-wire

作　　者：曾宪俊[1] 徐科军[1] 周杨[1] 王肖芬[1] 朱志海[1] 

机构地区：[1]合肥工业大学自动化研究所工业自动化安徽省工程技术研究中心,安徽合肥230009

出　　处：《仪表技术与传感器》2009年第1期76-79,共4页Instrument Technique and Sensor

基　　金：863计划资助项目(2007AA04Z180)

摘　　要：针对数字信号处理与低功耗之间的矛盾,为了满足一些工业现场对两线制电流传输的要求,研制了一种基于MSP430F1611单片机的低功耗、两线制涡街流量计数字信号处理系统。采用数字频谱分析与模拟带通滤波器组相结合的方式,既最大程度地滤除信号中混杂的噪声,提高测量精度,又保证低功耗工作;采用低功耗运放和数字电位器组成程控放大器,解决涡街传感器输出信号强度变化大的问题;采用独特的电源设计,为仪表两线制工作提供足够的电流。There are some contradictions between digital signal processing method and low-power technology. And some industry fields need the meters with low-power and two-wires. A low-power, two-wire vortex flowmeter digital signal processing system was designed based on MSP430F1611 MCU. The digital spectral analysis was combined with the analog band-pass filters to filter noises contained in vortex signal, improve the measurement accuracy and ensure the low power consumption in the system. A programmable gain amplifier was built using the low-power operational amplifier and potentiometer to adapt large amplitude variation of vortex signal. A special power supply module was designed to provide enough current for the meter with two-wires.

关 键 词：涡街流量计 低功耗 两线制 频谱分析 带通滤波器 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]