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Chapter 7: Modulation Methods 2 (Chemical Sensor (Spectroscopic Parameters…
Chapter 7: Modulation Methods 2
Physical sensor
FBG sensor
Basic setup
Principle
Broadband source sends the input spectrum to the FBG via 2x2 coupler
The missing wavelength corresponding to the Bragg's wavelength of the FBG
The reflection spectrum contains the missing wavelength
Variation in measurands at each FBG
Transmission and reflection curves
Theoretical Background
Bragg wavelength
Changes in temperature & strain
Strain measurement
Wavelength shift
Pe
Strain sensitivity
Temperature measurement
Bragg wavelength
Commercial FBG system
Bridge (civil structure)
Chemical Sensor
Spectroscopic Parameters
Absorbance
Luminescence
Reflectance
Scattering
Fiber Optics Corrosion sensors (FOCoS)
Corrosion model for steel concrete
Expected Reflected Power Output
Experimental setup
FOCoS Design
Design 1: Corrosion sen
sor
Design 2: pH sensor (sol gel film)
Wavelength Modulated Sensor
Gas detection cell
pH sensitive Probe
Y-extrinsic probe
Evanescent Probe
