摘要
为满足地下水温度高精度测量的要求,设计了一种基于卡尔曼滤波的钳电阻高精度水温测量系统。硬件上,以钳电阻Pt1000为温度传感器,选用四线制比值法消除引线电阻干扰,并通过限流电阻和频率式供电避免钳电阻自热效应。软件上,通过卡尔曼滤波算法和线性拟合提高了阻值测量的准确度和稳定性,使用反向函数法对Pt1OOO分度表进行分段拟合,以减小钳电阻非线性误差。试验结果表明,该系统在-20-+100℃内,最大误差为0.05℃,整体精度优于0.044%。该研究对相关钳电阻测温设计具有一定借鉴意义。
In order to meet the requirements of high precision measurement of groundwater temperature,a high precision platinum resistance water temperature measurement system is designed,which is based on Kalman filter.On the side of hardware,platinum resistance Pt1OOO is used as the temperature sensor,four-wire ratio method is adopted to eliminate the interference of lead resistance,and platinum resistance self-heating effect is avoided through current limiting resistance and frequency type power supply.On the side of software,the accuracy and stability of resistance measurement are improved by using of Kalman filter algorithm and linear fitting,and Pt1OOO dividing table is piece-wise fitted by using of inverse function method to reduce the nonlinear error of platinum resistance.The experimental results show that the maximum error of the system is 0.05℃ within -20~100℃,and the overall accuracy is better than 0.044%.This study has a certain reference significance for the design of temperature measurement of related platinum resistance.
作者
袁闯
赵学亮
魏光华
YUAN Chuang;ZHAO Xueliang;WEI Guanghua(College of Quality and Technical Supervision,Hebei University,Baoding 071002,China;Hydrogeological Environment and Geological Survey Center of China Geological Survey,Baoding 071051,China)
出处
《自动化仪表》
CAS
2020年第9期85-88,共4页
Process Automation Instrumentation
基金
自然资源部国家科技重大专项基金资助项目(2016ZX05040-002-002)。
关键词
PT1000
测温系统
四线制
卡尔曼滤波
分段拟合
铂电阻
比值法
高精度
Pt1OOO
Temperature measurement system
Four-wire system
Kalman filter
Piecewise fitting
Platinum resistance
Ratio method
High precision
