圧電フィルムを用いた静荷重検出に関する考察

抄録

It's possible to measure static load using piezoelectric film by sticking 2 sheets of identical films together. When one of the films is oscillated at its resonant frequency, the other film generates voltage by following up to the motion of the actuator film. The vibration of the body is suppressed due to the impressed load, and then the sensor voltage drops according to the magnitude of the load. Vibration analysis proved that the configuration of the vibration of the sensor body is not bending but in-plane expansion and contraction. It's also turned out that the characteristics of the sensor voltage are dominated not by the magnitude of the load but by the contact area of the load with the film. Therefore introducing the lamination material, which alters the contact area according to the magnitude of the load, will improve the sensitivity and the linearity of the sensor voltage to the load.