基于炭黑/硅橡胶的两种不同结构的压力传感器交流特性分析

"Fork" type and "sandwich" type pressure sensors based on carbon-black filled silicon rubber are designed. The pressure sensitive properties of carbon-black filled silicon rubber composite is analyzed. The AC characteristics of the sensors are explored by complex impedance, resistors and capacitors testing under AC voltage.The result shows that the AC characteristics of two kinds of pressure sensor is different For the "fork" type sensor, the mainly contributes to the pressure sensitive characteristics is the change of the resistance. For "sandwich" type sensor, the mainly contributes to the pressure sensitive characteristics is the change of the capacitance.Under a loading of 10 N, the "fork" type sensor has a sensitivity of 20 and a response and recovery time of 5S.the "sandwich" type sensor has a sensitivity of 5 and a response and recovery time of 5S. The sensors appear good sensitivity and response features in the process of loading and unloading. It shows that carbon-black filled silicone rubber composite is an ideal material for the flexible tactile sensor.