摘要
针对电导率检测过程中宽量程信号采集和误差补偿准确度问题,对电导率检测系统的交流激励源、高精度信号采样、量程自动切换、软件标定和温度补偿等方面进行了研究。通过对两电极体系的原理分析,设计了两电极体系的检测电路,利用精密电阻箱建立了电导率输出量与输入量之间的关系,使用电导率标准液进行了温度补偿模型测试,并基于STM32微控制器进行了该电导率检测系统实验。研究结果表明:该系统能实时检测电导率信号,具有量程自动切换、数据处理、软件标定、温度补偿等多项功能,并且检测系统的相对误差小于0. 5%。
Aiming at the wide range signal acquisition and error compensation accuracy in the process of conductivity detection, the AC excitation source, high-precision signal sampling, automatic range switching, software calibration and temperature compensation of the conductivity detection system were researched. The detection circuit of the two-electrode system was designed based on the principle study of the two-electrode system. The relationship between the output and input of the conductivity was established by using the precision resistance box, and the temperature compensation model was tested by using the conductivity standard liquid, as well as the conductivity detection system was realized based on the STM32 microcontroller. The experimental results show that the conductivity can be detected in real time, and multiple functions are provided such as automatic range switching, data processing, software calibration, temperature compensation, etc. The relative error of the detection system is less than 0.5%.
作者
綦声波
黄霖
尹保安
QI Sheng-bo;HUANG Lin;YIN Bao-an(College of Engineering, Ocean University of China, Qingdao 266100, China)
出处
《机电工程》
CAS
北大核心
2019年第2期158-162,共5页
Journal of Mechanical & Electrical Engineering
基金
国家重点研发计划资助项目(2016YFC1400800)
国家自然科学基金资助项目(51475197)
关键词
电导率
两电极体系
双极性方波
软件标定
温度补偿
conductivity
two-electrode system
bipolar square wave
software calibration
temperature compensation
