同轴电缆电容感测式水位传感器设计  

Design of Water Level Sensor Based on Capacitance Sensing Mechanism of Coaxial Cable

作　　者：薛瑄 王宇 王东 张红娟[2] 高妍[2] 靳宝全 XUE Xuan;WANG Yu;WANG Dong;ZHANG Hong-juan;GAO Yan;JIN Bao-quan(Taiyuan University of Technology,Key Laboratory of Advanced Transducers and Intelligent Control Systems,Ministry of Education and Shanxi Province,Taiyuan 030024,China;College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学新型传感器与智能控制教育部与山西省重点实验室,山西太原030024 [2]太原理工大学电气与动力工程学院,山西太原030024

出　　处：《仪表技术与传感器》2019年第2期9-13,17,共6页Instrument Technique and Sensor

基　　金：山西省科技基础条件平台项目(201605D121028)

摘　　要：针对传统水位传感器在恶劣水质条件下存在可靠性不高、测量精度低的问题,文中提出一种同轴电缆电容式水位测量方法,以特殊构造同轴电缆作为传感敏感元件,研究其将水位转为电容参数的传感机理,采用PCAP01电容数字转换方案,运用拟合与水位标定算法,设计了同轴电缆电容感测式水位传感器。实验结果表明,传感器在0.1～1 m水位范围内的测量精度可达0.01 m,稳定性良好,可应用于恶劣水质环境下的水位测量。Aiming at the problem that traditional water level sensors has the problem of low reliability and measurement accuracy of traditional water level sensors in poor water quality,this paper presented a capacitive water level measurement method with the special coaxial cable as a sensor sensitive element.By studying the sensing mechanism with which it transforms water level to the capacitance parameter and application of fitting and water level calibration algorithm,a capacitance-to-digital sensing water level sensor was designed with PCAP01 capacitance-to-digital conversion(CDC) processor.Experimental results show that with the water level calibration algorithm,the measurement accuracy of the sensor is 0.01m within the scope of 0.1m to 1m and its stability is good,which means that it can be applied to the water level measurement in the bad water environment.

关 键 词：恶劣水质 同轴电缆电容式水位测量 电容数字转换 PCAP01 标定算法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TP216[自动化与计算机技术—控制科学与工程]