基于DSP的浆液型电磁流量计的研制  

Development of DSP based slurry-type electromagnetic flowmeter

作　　者：杨双龙[1] 徐科军[1,2] 梁利平[1] 张然[1] 王刚 

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]工业自动化安徽省工程技术研究中心,合肥230009 [3]重庆川仪自动化股份有限公司,重庆404001

出　　处：《仪器仪表学报》2011年第9期2101-2107,共7页Chinese Journal of Scientific Instrument

基　　金："863"计划重点项目(No.2008AA042207);重庆市科学技术委员会项目(No.CSTC2008AB2059)资助

摘　　要：设计高频方波励磁方案,提出浆液信号处理方法,以DSP芯片TMS320F2812为核心研制浆液型电磁流量计,以解决浆液测量问题。励磁控制部分采用线性电源搭建恒流源并以高压供电,实现高频方波励磁,并保证信号零点的稳定。信号调理部分采用差分放大、偏置调整以克服共模干扰和极化漂移。信号处理部分采用基于统计分析与信号重构的浆液信号处理方法去除浆液干扰,获得稳定的流量输出。水流量标定和纸浆浆液测量实验结果表明,该浆液型电磁流量计水流量测量精度优于0.5%,浆液测量的稳态波动率小于4%,动态跟随响应时间小于4 s,满足实际应用对浆液测量的要求。Aiming at slurry measurement, a high-frequency square-wave excitation circuit was designed, a slurry signal processing method was proposed, and a slurry-type electromagnetic flowmeter was developed with DSP-ehip TMS320F2812. In the excitation control section, a constant current source is built using linear regulator and powered by high voltage supply to realize the excitation of high-frequency square-wave and ensure the stability of signal zero point. In the signal conditioning section, a differential amplifier and offset adjustment method are adopted to over- come common mode interference and polarization drift. In the signal processing section, a signal processing method combing statistical analysis and signal reconstruction is put forward to remove the slurry interference and obtain steady flow-rate output. The results of water flow calibration and paper slurry measurement experiment show that the measurement accuracy of the slurry-type electromagnetic flowmeter is better than 0.5% for water flow; and the fluctuating rate is lower than 4% and the dynamic response time is less than 4 seconds for slurry flow, which satisfies the requirements of slurry measurement in practical applications.

关 键 词：电磁流量计 浆液测量 TMS320F2812 高频励磁 信号处理 

分 类 号：TH814[机械工程—仪器科学与技术]