SYSTEM FOR MEASURING BRIDGE DEFLECTION USING OPTICAL FIBER

摘要

The present invention relates to a system for measuring the deflection of a bridge by using an optical fiber strain gage capable of measuring sensitively and precisely the deformation of a girder via a characteristic installation structure. The system for measuring the deflection of the bridge by using the optical fiber strain gage according to the present invention comprises: the optical fiber; a protecting member for protecting the optical fiber; a Bragg grating sensor formed in the optical fiber; and sensing devices installed at each of N unit sections into which the girder of the bridge is divided in a longitudinal direction. The optical fiber of the sensing devices installed at each of the unit sections includes a left side fixing end and a right side fixing end for fixing a left part and a right part of the Bragg grating sensor respectively; and a slope tilted upward or downward from the left side fixing end to the right side fixing end about the ground surface or the water surface where the bridge is built.