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.
引文
[1] 安全,范瑞琪.常用水位传感器的比较和选择[J].水利信息化,2014(3):52-54.
[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.