Development of Network Type Sensor System for Structural Health Monitoring by the use of Piezoelectric Material

本研究的目的是开发一个传感器具有两种功能的复合传感器，并开发利用压电传感器进行结构远程诊断的联网仪器系统。以下是研究结果。(1)用于弯曲变形测量的复合传感器通过激光束加工在聚合物压电薄膜表面形成多种电极图案。通过实验澄清了在使用PVDF薄膜之前研制的弯曲变形传感器存在的问题。阐明了复合传感器不仅可以测量被测物体的弯曲变形曲率，而且可以确定变形位置。(2)网络化仪器系统研制了适合复合变形传感器信号调理的仪器系统。系统还具有与个人计算机的通信设施。该系统由一个主终端单元和几个带信号调节器的远端单元组成。这些单元通过串行网络连接。实验证明，该系统能够采集到结构数据。

The purposes of this study are to develop composite sensor that equipped with two functions in one sensor and to develop network connected instrumentation system for remote diagnosis of structure using piezoelectric sensor. Followings are the results of the study.(1) Composite sensor for bending deformation measurement A variety of electrode patterns are molded on the surface of a polymer piezoelectric film accumulated by the laser beam machining. It was experimentally clarified that problem of the bending deformation sensor developed before using PVDF film. And also it was clarified curvature of bending deformation of the measurement object was able not only to be measured but also to specify the deformation position using composite sensor.(2) Network connected instrumentation system The instrumentation system that is appropriate for the signal conditioning of the composite deformation sensor is developed. The system also has the telecommunication facility with the personal computer. The system consists of a master terminal unit and several remote terminal units with signal conditioner. These units are connected serial network. It was experimentally verified that this system was able to collect the structural data.