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Chapter 7 : Modulation method 2 (Physical sensors (FBG sensors 61,…
Chapter 7 : Modulation method 2
Physical sensors
FBG sensors
Transmission & reflection curves
The Bragg wavelength
Changes in either strain or temperature or both will cause a change in the Bragg wavelength&this may be expressed as
In strain measurement,the wavelength shoft may be simply expressed as
The fractional Bragg wavelength shift for temperature change may be written as
Strain sensitivity
Commercial FBG system
Chemical sensors
Fibre optic probes
Fiber optics corrosion sensors(FOCoS)
Corrosion model for steel in concerete
Expected reflected power output
Experimental setup
Experimental result
FOCos design 2
FOCos design 1
