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.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
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
