一种基于两电极体系的电导率检测系统
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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%.
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%.
引文
[1]张挺.基于高精度温度、电导率传感器的新型盐度计集成设计[D].天津:国家海洋技术中心海洋测量传感器技术研究室,2017.
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[3]余翔,张冰,林桢,等.基于Van Der Pauw原理的溶液电导率计[J].浙江大学学报:工学版,2015,49(2):371-375.
[4]贾文娟,兰卉,李红志.三电极电导率传感器测量电路的研制[J].海洋技术学报,2013,32(3):33-36.
[5]李琳,陈文芗.频率自适应电流源克服电容影响的电导率测量[J].仪器仪表学报,2007,28(12):2256-2259.
[6]张高燕,吴少华,赵湛.基于MEMS工艺的硅基四电极电导率与温度集成传感器芯片的研制[J].传感技术学报,2011,24(7):966-969.
[7]兰卉.七电极电导率传感器及CTD测量系统技术研究[D].天津:天津大学精密仪器与光电子工程学院,2012.
[8] JONES R G. Measurements of the electrical conductivity of water[J]. IEEE Proceedings-Science Measurement and Technology,2002,149(6):320-322.
[9]刘致滨,宋文晓,杨晶娟,等.透析液电导率测量仪的研究[J].自动化仪表,2013,34(1):64-68.
[2]张兆英.海水电导率、温度和深度测量技术探讨[J].仪器仪表学报,2003,24(z4):38-41.
[3]余翔,张冰,林桢,等.基于Van Der Pauw原理的溶液电导率计[J].浙江大学学报:工学版,2015,49(2):371-375.
[4]贾文娟,兰卉,李红志.三电极电导率传感器测量电路的研制[J].海洋技术学报,2013,32(3):33-36.
[5]李琳,陈文芗.频率自适应电流源克服电容影响的电导率测量[J].仪器仪表学报,2007,28(12):2256-2259.
[6]张高燕,吴少华,赵湛.基于MEMS工艺的硅基四电极电导率与温度集成传感器芯片的研制[J].传感技术学报,2011,24(7):966-969.
[7]兰卉.七电极电导率传感器及CTD测量系统技术研究[D].天津:天津大学精密仪器与光电子工程学院,2012.
[8] JONES R G. Measurements of the electrical conductivity of water[J]. IEEE Proceedings-Science Measurement and Technology,2002,149(6):320-322.
[9]刘致滨,宋文晓,杨晶娟,等.透析液电导率测量仪的研究[J].自动化仪表,2013,34(1):64-68.