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：唐正茂[1,2] 王惠玲[3] 刘志远[3] 蔡春丽[3] 崔体波[3] 

机构地区：[1]华中科技大学船舶与海洋工程学院,湖北武汉430074 [2]武汉第二船舶设计研究院,湖北武汉430064 [3]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：《传感器与微系统》2010年第3期89-91,共3页Transducer and Microsystem Technologies

摘　　要：通过对电容式液位传感器的分析与研究,设计了一种新型电容阵列式液位传感器。介绍了电容阵列式液位传感器的原理和设计方案。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电容检测电路,用单片机STC89C52控制传感器中电容器的选通、数据的采集和处理,并计算出液位值,输出转换成4～20mA电流信号。实测结果表明:该液位传感器精度可达0.3%FS,零点输出稳定,漂移小,受温度影响小,热零点漂移指标优于2×10-5FS/℃。By analyzing and researching on capacitive liquid level sensor, a new type of capacitive array liquid level sensor is designed. The principle and design scheme is introduced. One electrode of capacitance is designed to array structure,another is shared. A tiny capacitance detection circuit based on the principle of charging and discharging is selected. SCM STC89C52 is used for controlling the gating of tiny capacitance, data acquisition and processing. The liquid level is calculated and converted to current signal of 4 -20 mA. Experimental results show that the non-linearity and precision of the liquid level sensor approach 0.3 % FS, zero output is stable. It has the advantage of little drifting,low temperature influence, and zero temperature 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]