表面四电极含金属芯压电纤维的冲击振动传感特性研究

模仿昆虫毛发感受器的结构和功能,设计制备了一种能测量外部振动的表面四电极含金属芯压电纤维(FMPF)冲击振动传感器.采用干压成型法制备了含铂金芯的压电陶瓷纤维胚体,经过高温烧结、涂镀表面电极、高温极化后,制成FMPF传感器.基于压电方程和振动理论,建立了悬臂梁结构的FMPF冲击振动传感器的理论模型,分析了传感信号与冲击振动角度和幅值的关系.把FMPF固定在基体上,搭建了实验系统,测试了FMPF对冲击振动的响应,验证了理论模型.结果表明,FMPF的传感信号和冲击振动的幅值成线性关系,和方向成"8"字形关系.得出了FMPF传感器能够测量冲击振动幅值和方向的结论.

Vibration sensing properties of a metal core piezoelectric fiber with four electrodes on the surface

The four electrode metal core piezoelectric fibers( FMPF) impact vibration sensor that can perceive a vi-bration perception of the external surface is made through imitating the structure and function of insect's hair sensil-la. Piezoelectric ceramic fiber embryo containing platinum core was prepared by using dry pressing method and was treated by high temperature sintering, coating the surface of electrode polarization, high temperature polarization, then FMPF impact vibration sensor is made.The theoretical model of the FMPF impact vibration sensor of the canti-lever beam is established and the relationship between the sensing signal and the angle and amplitude of the shock vibration is analyzed based on the piezoelectric equations and vibration theory. The FMPF is fixed on the substrate, and the experimental system is built,and the response of FMPF to the impact vibration is tested,and the theoretical model is verified. The results show that the amplitude of the sensing signal and the shock vibration of FMPF is line-ar,and the direction of the"8"-shaped relationship. The conclusion is drawn that the FMPF sensor can measure the magnitude and direction of the shock vibration.