三自由度介电型EAP软材料位置传感器研究  

Research on Three-Degree-of-Freedom Dielectric Electroactive Polymer Soft Position Sensor

作　　者：陈峰洪 王化明[1] 李鹭扬[2] 汪洋[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]扬州大学机械工程学院,江苏扬州225000

出　　处：《压电与声光》2016年第6期855-860,共6页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51305209);江苏省自然科学基金资助项目(BK20130979);江苏省"六大人才高峰"基金资助项目(2014-ZBZZ-004);南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj20150516)

摘　　要：基于介电型电活性聚合物(EAP)变形时的电容值变化原理,设计并实现一种三自由度软材料位置传感器,其内框可沿平面和法向移动,分别用于检测平面和法向位移。建立该传感器的几何模型,推导出其电容值变化和内框位移的关系。采用差分法测试该传感器的电容值变化,分析了面对面两个传感单元的电容值差和内框的平面位移、单个传感单元的电容值和内框的法向位移之间的关系,测试得到其平面和法向位移灵敏度分别为66.69pF/mm、0.47pF/mm^2,与理论分析结果较吻合。该位置传感器的理论与测试分析结果验证了介电型EAP应用于位置传感器中的可行性。Based on capacitance change principle of dielectric electroactive polymer （EAP）, a 3-DOF soft position sensor is designed and implemented. The inner frame of the sensor can translate in in-plane and out-of-plane directions, which are used to measure the plane and normal displacement respectively. A geometrical model of the proposed sensor is developed and the relationship between the capacitance of the sensor and the displacement of the inner frame are deduced. A differential approach is used to measure the variation of the capacitance of the sensor, and the relationship between the capacitance difference of two opposite sensing cells and the in-plane displacement of the inner frame as well as the relationship between the capacitance of single cell and the out-of-plane displacement of the inner frame are analyzed. The measured in-plane and out-of-plane displacement sensitivity are of 66.69 pF/mm and 0.47 pF/mm^2 respectively, which agree well with the analytical results. The theoretical and experimental analyses verify the feasibility of the application of dielectric EAP to the position sensors.

关 键 词：介电型电活性聚合物(EAP) 位置 传感器 几何模型 差分测量 

分 类 号：TP24[自动化与计算机技术—检测技术与自动化装置]