同轴电缆电容感测式水位传感器设计
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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 0.01 m within the scope of 0.1 m to 1 m and its stability is good,which means that it can be applied to the water level measurement in the bad water environment.
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 0.01 m within the scope of 0.1 m to 1 m and its stability is good,which means that it can be applied to the water level measurement in the bad water environment.
引文
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[2] 钟惠琴.基于S3C2440的矿井智能水位监测仪的设计[J].工矿自动化,2010,36(4):76-78.
[3] AMEEN O F,YOUNUS M H,AZIZ M S,et al.Graphene diaphragm integrated FBG sensors for simultaneous measurement of water level and temperature[J].Sensors & Actuators A Physical,2016,252.
[4] 徐鸿,郭鹏,田振华,等.非浸入式超声导波液位测量方法研究[J].仪器仪表学报,2017,38(5):1150-1158.
[5] 钟佳迅,庹先国,王洪辉,等.高精度地下水位监测仪[J].仪表技术与传感器,2012(9):15-17.
[6] JIN B,ZHANG Z,ZHANG H.Structure design and performance analysis of a coaxial cylindrical capacitive sensor for liquid-level measurement[J].Sensors & Actuators A Physical,2015,223:84-90.
[7] 王再英刘淮霞陈毅静.过程控制系统与仪表[M].机械工业出版社,2006,55-60.
[8] 周英钢,李桐,颜华.基于CDC技术的微小电容测量系统[J].沈阳工业大学学报,2015,37(4):428-433.
[9] 邓丽莉,桑胜波,张文栋,等.基于Pcap01芯片的高精度微电容检测系统设计[J].传感技术学报,2013(8):1045-1049.
[10] 李一鸣,荣军,王岳斌,等.一种简易红外通信装置的设计与实现[J].电子器件,2015(6):1385-1392.
[11] 罗少轩,乔爱民.基于ColdFire MCF52223和AD5420的闸门开度仪设计[J].电子技术应用,2011,37(7):93-96.
[12] 王效华,牛思先.基于单片机PWM控制技术的实现[J].武汉理工大学学报,2010(1):94-98.
[13] 马文华.嵌入式系统设计与开发[M].科学出版社,2011,11-14.