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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