Abstract
This paper focuses on the measurement of ground deformation using fiber optic sensor, called Fiber Bragg Grating (FBG) sensor. A displacement transducer based on FBG sensors was developed and tested in the laboratory. Additionally based on experimental and numerical observations, an assessment on sensor arrangement of the transducer as well as the displacement estimation procedure was made. As a result of the experiment, it was found that FBG sensors agreed well with resistive gauges for strain measurement on vinyl chloride pipe and the proposed transducer estimated the displacement with an accuracy of about 6.7% in the bending test. It was also found from numerical evaluations that although there was no significant difference between two algorithms, the spline interpolation and the uniform sensor arrangement may be preferable for uncertianity in displacement distribution.
