高精度在线式原油含水率检测仪设计研究  

Research on the design of high accuracy online instrument for measuring crude oil content

作　　者：张文典[1] 孙晓东[2] 王凤蕴[1] 龙玫[1] 

机构地区：[1]长春汽车工业高等专科学校机电学院,长春130013 [2]吉林大学通信工程学院,长春130025

出　　处：《电子测量技术》2015年第5期122-126,共5页Electronic Measurement Technology

摘　　要：基于阻抗式传感器,提出一种在线式高精度原油含水率检测仪。首先采用最小二乘方法,根据实测数据获得阻抗式传感器的温度系数,然后拟合出参考温度下含水率与电压的拟关系曲线。现有的阻抗式传感器在长时间工作后会出现电荷积累效应,影响含水率测量精度;为此,设计了电荷放电电路,其在微控制器的控制下定期对激励电极的累积电荷进行放电,能有效解决电荷积累带来的测量误差问题。试验结果表明,该方法可以设计高精度在线式原油含水率检测仪。Based on the impedance sensor, we design a instrument for measuring water rate in crude oil. The least square method is employed first, Based on the measured data, the temperature coefficient of the impedance sensor is obtained , then the fitting curves of the relationship between moisture content and voltage at reference temperature is achieved. The impedance sensors now available usually show the charge accumulation effect after working for a long time, which impacts the measuring precision of moisture content. In this paper, the discharge circuit is designed to discharge the stored charges regularly under the control of the microcontroller. Thus it provides an effective method to solve the problem of measurement error caused by charge accumulation. The experimental results show that this method can design the measurement of moisture content of crude oil with the high precision.

关 键 词：阻抗式传感器 在线测量 原油含水率 激励电极 测量电极 放电电路 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]