一种电容阵列式液位传感器的设计与实现  

Design and Implement of Capacitive Array Liquid Level Sensor

作　　者：刘志远[1] 王惠玲[1] 蔡春丽[1] 于云选[1] 李冰冰[1] 

机构地区：[1]中国电子科技集团公司第四十九研究所,黑龙江哈尔滨150001

出　　处：《仪表技术与传感器》2010年第5期7-9,33,共4页Instrument Technique and Sensor

摘　　要：通过对电容式液位传感器的分析与研究,设计了一种新的电容阵列液位传感器。该传感器将电容一极板设计成阵列式结构,另一极板共用,采用基于充放电原理的微小电容检测电路,应用单片机XC886控制小电容器的选通、数据的采集和处理,计算出液位值,并通过CAN总线传送给上位机,实现实时监测。实测结果表明:该传感器受温度影响小、精度高、输出稳定,精度优于1%FS,零点漂移小于2×10-5FS/℃.By the analysis and research of capacitive liquid level sensor,a new type of capacitive array liquid level sensor was designed.One electrode of capacitance was designed to array structure and another was shared,a tiny capacitance detection circuit based on the principle of charging and discharging was selected,SCM XC886 was used for controlling the switch of little capacitor,sampling and processing of data,and calculating out the liquid level and transmitting it to upper machine by CAN bus,so that actualizing real-time detection.Experimental results show that zero output is stable of the liquid level sensor with low temperature effect and high accuracy,the precision excelled 1%FS and zero drift is less than 2×10-5FS/℃.

关 键 词：传感器 电容阵列 液位 充放电 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]