新型数字电容式液位传感器  

A Novel Digital Capacitive Liquid Level Sensor

作　　者：李一方[1] 朱华铭[1] 童鑫[1] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,安徽合肥230009

出　　处：《电子科技》2011年第5期65-68,79,共5页Electronic Science and Technology

摘　　要：介绍了一种用于测量汽车油箱液位的技术,利用电容量随极板间介质变化的原理,以液晶显示的方式显示油箱剩余燃油量和箱内温度。用于信号采集的电容探头具有自动补偿功能,确保测量结果不受温度和杂质的影响。电容信号检测使用高集成的电容数字转换器,提高了测量精度。信号传输网络易于和车身网络系统集成,显示结果准确、实时。Based on the principle of capacitance changed with dielectric constant between the two plates,a kind of technology for measuring liquid level of automobile fuel tank is introduced,and the amount of residual fuel and temperature in tank is displayed by LCD.With the automatic-compensation function of capacitive probe for signal acquisition,the temperature and impurities of fuel have no effect on the results.A highly-integrated capacitance-to-digital converter is used to detect capacitance signal to improve the measurement accuracy.The signal transmission network can be integrated with automotive body-network system easily and the accurate and real-time result is displayed.

关 键 词：油箱液位 电容探头 自动补偿 电容数字转换器 

分 类 号：TN79[电子电信—电路与系统] TP274.2[自动化与计算机技术—检测技术与自动化装置]