油漆涂层下PVDF的应变传感及测量方法研究  

Research on Strain Sensing and Measurement Method of PVDF Films under

作　　者：刘刚[1] 黄一[1] 董维杰[2] 孙宇[1] 

机构地区：[1]大连理工大学船舶制造国家工程研究中心,辽宁大连116024 [2]大连理工大学电子与信息工程学院,辽宁大连116024

出　　处：《压电与声光》2007年第5期615-618,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(50509004);辽宁省博士科研启动基金资助项目(20061069)

摘　　要：针对目前聚偏二氟乙烯(PVDF)压电薄膜在船舶与海洋工程结构表面应变传感应用方面存在的一些缺陷,提出了一种将压电薄膜保护在结构的油漆涂层下面,并采用非接触式静电电压表检测薄膜表面感应电荷的结构表面应变测量方法。首先,根据压电方程推导了在非接触测量方式下,电压表测量电压和结构表面应变分量间的关系式;然后,从静电电压表探头的测量原理分析了探头和被测表面间的零电场技术,从理论上预测可以对埋藏在油漆涂层下的PVDF压电薄膜进行感应电荷检测;最后在一块平滑钢板试件上粘贴10片压电薄膜,并进行表面油漆喷涂处理,通过试件单向加载实验,对电压-应变关系式中的参数进行标定和测量油漆涂层下的薄膜表面感应电荷。实验结果表明,该法在应用上具有可行性和明显的工程意义。With the aim to improve the application of polyvinylidene fluoride （PVDF） films for surface-strain sensing of ship and marine structures, we developed an experiment method for the strain sensing by using an electrostatic voltmeter of non-contact type to detect inductive charges on the PVDF film, which was covered by paint coating of the structure. First, the relationship between the measured potential on the PVDF film and the strain components on the structural surface was deduced from the piezoelectric constitutive law. Then, according to the measurement theory of the probe connected to the electrostatic voltmeter, we analyzed the field-nulling technique between the probe and the detected film surface, and doped out that it was possible to measure the inductive charges on the PVDF film even covered by the paint coating of the structure. An Experiment was carried out, in which PVDF films were adhered upon a smooth plate specimen under known axial uniform tension, to obtain two parameters in the deduced potential-strain relationship. The same measurement was also performed after the PVDF films were sprayed with the paint. Our results showed that the proposed method was feasible and had obvious significance for the strain sensing of engineering structural surface.

关 键 词：PVDF压电薄膜 应变传感 油漆涂层 静电电压表 非接触式 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]