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http://dx.doi.org/10.5369/JSST.2005.14.3.169

A multiplexed fiber-optic sensor for measuring large displacement  

Yoo, Jung-Ae (Department of Physics, Hannam University)
Kwon, Il-Bum (Korea Research Institute of Standards and Science, Smart Measurement Group)
Jo, Jae-Heung (Department of Physics, Hannam University)
Seo, Dae-Cheol (Korea Research Institute of Standards and Science, Smart Measurement Group)
Publication Information
Journal of Sensor Science and Technology / v.14, no.3, 2005 , pp. 169-179 More about this Journal
Abstract
A multiplexed bend loss type single-mode fiber-optic sensor system was prepared to measure the displacement of several cm of the civil engineering structures such as many bridges, tunnels and various buildings. This bend loss type fiber-optic sensor used the signal difference between two reflection signals due to various bend losses generating at a pair of optical connectors by using OTDR (optical time domain reflectometer) for measuring displacements. And the experiments were conducted for showing the measurement feasibility on the range of 10 cm, and the multiplexing experiments were also performed to measure the displacements of 5 measuring positions of an object by setting these 5 fiber-optic sensors on a single mode fiber simultaneously.
Keywords
Fiber-optic sensor; Bend loss; OTDR; Displacement measurement; Multiplexing;
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