Vibration Sensors Using Power Generation with Electret for Bridge Monitoring

Abstract

The structural monitoring of civil engineering structures such as bridges has been of importance recently, and one of the key issues in structural monitoring is to grasp the dynamic behaviors of the structures. In this study, by utilizing the power generation characteristics of electrets, new innovative vibration sensors are investigated using electret material. The concept and the fundamental characteristics of the power generation sensors were described. Furthermore, the development of a new very low resonance frequency vibration sensor with electrets was undertaken, and the performance of the new sensors was evaluated.