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

本研究的目的是研制一种集两种功能于一身的复合式传感器，并利用压电式传感器开发用于结构远程诊断的网络化仪器系统。研究结果如下：(1)用于弯曲变形测量的复合型传感器在激光加工堆积的聚合物压电薄膜表面成型了多种电极图案。从实验上澄清了在使用PVDF薄膜之前出现的弯曲变形传感器的问题。并阐明了利用复合传感器不仅可以测量被测物体弯曲变形的曲率，而且可以确定变形的位置。(2)开发了适合复合变形传感器信号调理的网络化仪器系统。该系统还具有与个人计算机的电信设施。该系统由一个主终端单元和多个带有信号调理器的远程终端单元组成。这些单元通过串口网络相连。经实验验证，该系统能够采集结构数据。

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.