Development of FBG Accelerometer for Railway Tunnel Vibration

철도터널 진동 모니터링을 위한 광섬유 가속도계 개발

  • 이수형 (한국철도기술연구원 신교통연구본부) ;
  • 신민호 (한국철도기술연구원 신교통연구본부) ;
  • 김현기 (한국철도기술연구원 신교통연구본부) ;
  • 이규완 ((주)카이센)
  • Received : 2011.03.28
  • Accepted : 2011.08.13
  • Published : 2011.08.26


For the safety management of tunnel, effective measurements should be continuously carried out. Most of sensors currently being applied for tunnels measure only the local status, thus many of them are needed to monitor an entire tunnel. For the railway tunnel where trains of same conditions are regularly operated, dynamic responses of tunnel structure to train operations can be a good index to estimate the deformation of tunnel structure in wide area. Meanwhile, the electromagnetic interference caused by overhead centenary in railway tunnel obstructs the use of electric-based sensors. In this study a brand new accelerometer using FBG optical fiber sensors is developed to solve these problems. Sensitivity and capacity of the accelerometer are enhanced with effective structural design of its components and verified with laboratory tests. A case history where the developed accelerometers were applied to a safety monitoring system of a high-speed train tunnel is presented. The performances of the developed accelerometers are validated from the measured acceleration data.


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