基于双极性电压激励信号的四电极电导率测量仪的设计  

Design of Four-electrode Conductivity Instrument based on Bipolar Voltage Excitation

作　　者：魏光华[1,2] 赵学亮 李康[1,2] 孟庆佳 韩双宝[1] 朱继良 WEI Guang-hua;ZHAO Xue-liang;LI Kang;MENG Qing-jia;HAN Shuang-bao;ZHU Ji-liang(Hydrogeological Environment And Geological Survey Center Of China Geological Survey,Baoding 071051,China;Key Laboratory Of Geological Environment Monitoring Technology,Baoding 071051,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051 [2]地质环境监测技术重点实验室,河北保定071051

出　　处：《仪表技术与传感器》2019年第5期34-37,49,共5页Instrument Technique and Sensor

基　　金：国家科技重大专项(2016ZX05040-002-002);国土资源部水工环地质调查项目(DD20160240,DD20160253)

摘　　要：文中设计了一种基于双极性电压激励信号的开放式四电极电导率测量仪,可有效避免电导率测量时的溶液极化效应。设计中将待测信号转变为直流稳态信号,简化了电路设计。通过量程切换设置不同的采样电阻,提高测量范围和精度,利用差分电压采集模式提高数据采集的精度和抗干扰能力。系统采用集成温度传感器进行电导率补偿。测试实验验证设计准确稳定、抗干扰能力强。An open cell four electrode electrical conductivity intrument based on bipolar voltage excitation has been devel oped,which avoding the polarization effect.In the design,the signal to be detected is converted to direct stable voltage signal which simplified the circuit construction.Different sampling resistor is set by switching range to improve the resolution of data ac qusition and measuring range.The voltage is aquired by differential mode to enhance the data acqusition precision and the capabil ity of anti interface ability.The integrated temperature sensor is used in the system to compensate the conductivity.The experiment test result shows that the design is accurate,has powerful anti interface ability.

关 键 词：双极性激励信号 开放式四电极 电导率 极化效应 量程切换 差分模式 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]