Quasi-distributed displacement sensor for structural monitoring using a commercial OTDR

A quasi-distributed displacement sensor for structural monitoring using an optical time domain reflectometer is demonstrated. Four displacement sensing heads are placed along a standard single mode optical fibre in several locations with different intervals. Their configurations introduce power loss...

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Bibliographic Details
Published in:Optics and lasers in engineering 2006-08, Vol.44 (8), p.771-778
Main Authors: Pinto, N.M.P., Frazão, O., Baptista, J.M., Santos, J.L.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Displacement sensing heads
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Integrated optics. Optical fibers and wave guides
Optical and optoelectronic circuits
Optical fibre sensors
OTDR
Physics
Quasi-distributed sensor
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
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Description
Summary:A quasi-distributed displacement sensor for structural monitoring using an optical time domain reflectometer is demonstrated. Four displacement sensing heads are placed along a standard single mode optical fibre in several locations with different intervals. Their configurations introduce power loss through the decrease of their fibre loop radius when displacement is applied. The decrease of the light intensity with displacement variation is reported. Losses of 9 dB for a ∼120 mm displacement with a sensitivity of ∼0.027 dB/mm are reported. The quasi-distributed configuration is able to address sensors with ∼1 m distance resolution between them.
ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2005.07.009