表面部分电极含金属芯压电纤维气流传感特性研究

Investigations on the Sensitivity of Airflow Using Partially Coated Metal Core Piezoelectric Fiber

含金属芯压电纤维可以模仿昆虫的毛发感受器,感知周围环境的气流变化。在含金属芯压电纤维的部分纵向表面涂镀电极,制备了表面部分电极含金属芯压电纤维传感器PMPF(Partial electrode of Metal core Piezoelectric Fiber)。基于平均电荷法,建立了悬臂梁结构PMPF准静态气流传感模型,分析了PMPF产生的电荷值与表面电极分布角度、纤维长度、气流流速和气流方向的关系。搭建了实验系统,测试了PMPF对冲击气流的响应,验证了理论模型。结果表明,PMPF的传感信号和气流流速成指数关系,和气流方向成"8"字形关系。PMPF具有气流速度和方向的传感性能。

Metal core piezoelectric fiber can simulate insects＇ hair flow sensors,and measure the airflow changes ofthe surrounding environment. In this paper,we coated part of the longitudinal surface of the metal core piezoelectricfiber with electrode,and prepared partial coated metal core piezoelectric fibers（PMPF）. Based on the averagecharge method,the cantilever PMPF quasi-static airflow sensor model was established,the relationship between thetwo electrodes＇ charge value on PMPF and the surface electrode distribution angle and the length of fiber were ana-lyzed. The experimental platform of cantilever PMPF airflow sensor was established,and the response of PMPFwhen impact airflow acted on was tested whose results verified the theoretical model. The results show that the out-put signal of the PMPF has a index relation with the air flow velocity,and a ＂8＂ glyph relation with the air flow direc-tion. PMPF has the properties of sensing the airflow velocity and direction.