Post on 03-Apr-2018
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MONITORING BRIDGER
FIBER OPTIC SENSORS
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INTRODUCTION
The huge number of bridges needs more observation
techniques
Increasing loads
Ageing of materials
Environment action
Fiber optic sensors effective comparing to traditional electro-
mechanics sensors.
valuable in sensing systems Easier to be implemented
remote sensing
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Fiber Bragg Gratings (FBG)
Introduction
Wavelength modulated
StructureDistributed Bragg reflector
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Advantages of FBG
remote Sensing Ability
Easy to Install
simple to Multiplex
non-Electrical
Environmentally Stable Sensor Design
Ideal for Harsh Environments
uses light waves not visible to the naked eye
no electro-magnetic field generated
chemically passive
wide operation temperature range
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FBG in bridge monitoring
Strain monitoring
Crack detect
Overloading alert
Cables chemical problems
E.g. corrosion
Principles (encapsulated)
capillary encapsulated
slice base encapsulated
Monitoring
Capable for wide range of analyzers