相对介电常数实时监测系统设计

Design of Relative Dielectric Constant Real-time Monitoring System

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.