Passive sensor frequency selective surface for structural health monitoring

Abstract

Structural health monitoring (SHM) technologies have attained attention to monitor civil structures. SHM sensor systems have been used in various civil structures such as bridges, buildings, tunnels and so on. However the previous sensor for SHM is wired and encounter with problem to cover large areas. Therefore, wireless sensor was introduced for SHM to reduce network connecting problem. Wireless sensors for Structural Health monitoring are new technology and have many advantages to overcome the drawback of conventional and wired sensor. This project proposed passive wireless SHM sensor using frequency selective surface (FSS) as an alternative to conventional sensors. The electromagnetic wave characteristic of FSS will change by geometrical changes of FSS due to mechanical strain or structural failure. The changes feature is used as a sensing function without any connecting wires. Two type of design which are circular ring and square loop along with the transmission and reflection characteristics of SHM using FSS were discussed in this project. A simulation process has shown that incident angle characteristics can be use as a data for SHM application.

Practical Implementation of Structural Health Monitoring in Multi-Story Buildings

“…They used a robust statical model and numerical simulation. Mustafa et al [40] recommended using new advanced wireless sensors (FSS) instead of conventional sensors to predict the damage of buildings with two designs, the circular ring (FSS) and the square loop (FSS). The square loop outperformed the circular loop due to an improved reflection coefficient and incident angle, and it covered a wide frequency range.…”