相对介电常数实时监测系统设计  

Design of Relative Dielectric Constant Real-time Monitoring System

作　　者：季鑫源[1] 行鸿彦[1] 徐伟[1] 

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏省气象探测与信息处理重点实验室,江苏南京210044

出　　处：《仪表技术与传感器》2016年第2期42-44,共3页Instrument Technique and Sensor

基　　金：国家自然科学基金(61072133);江苏省产学研联合创新计划(BY2013007-02,BY2011112);中国气象局大气探测重点开放实验室开放课题(KLAS201407)

摘　　要：为解决相对介电常数的快速测量以及长时间监测其随环境变化的问题,在研究不同填充介质对共面平板电容量值影响的基础上,提出了用同面电容法测量材料的相对介电常数。设计了包含同面多电极电容传感器、电容测量电路、单片机控制与液晶显示电路的测量系统,实现了相对介电常数测量。实验结果表明:该系统能有效地测量固体材料的相对介电常数,精度可达到5%。测量系统无需制样,只需将传感器测量区域靠近待测目标即可实现快速测量和长时间在线监测。A method was put forward to quickly measure the material＇s relative dielectric constant and monitor its changing with the environment. The principle is the capacitance changing with different filling medium between electrodes. Then a measurement system was designed to realize the measurement. It included coplanar capacitive sensor with multi-electrode,capacitance measurement circuit,MCU control circuit and LCD display circuit. The experiment results show that the system can effectively measure the relative dielectric constant of solid material,and its precision can reach 5%. The measurement system can realize rapid measurement without sampling and long time online monitor by putting the sensitive area to material.

关 键 词：相对介电常数 同面电容传感器 电容测量 STM32单片机 串行液晶 

分 类 号：TH89[机械工程—仪器科学与技术]