철도시설물 건전성 모니터링을 위한 분포형 광섬유 센서 시스템 개발

초록

When the railway has newly constructed, safeties for this structures are fully guaranteed and then opened, but as time passes, it became exposed to harsh external environments and iterative train-loads so that the cracks are generated and sudden collapses can be originated. To prevent the accidents resulting from this situation, the system which can monitor the safety in realtime should be developed. In this study, distributed optic fiber sensor system to monitor the strain and temperature over full range using optical fiber is developed. Brillouin optical correlation domain analysis (BOCDA) are used, which is measuring method for Brilluoin scattering that uses a pump and probe wave in continuos form for the position selective generation of stimulated Brillouin scattering. BOCDA systems uses a Brilluin scattering that is a nonlinear optical phenomenon generating inside of optical fibers and it can be used without any additional sensing procedure in optical sensors and has merits of high spatial resolution and can select a random measurement position.