Title :
A novel demodulation scheme for fiber Bragg grating sensor system
Author :
Youlong Yu ; Hongxia Zhao
Author_Institution :
Res. Inst. of Fiber Opt., Heilongjiang Univ., Harbin, China
Abstract :
A novel fiber Bragg grating (FBG) wavelength demodulation scheme based on a compound interference configuration is introduced. This scheme measures the strain-induced wavelength-shift of the FBG in terms of phase-shift signal. The sensing resolution and sensitivity were demonstrated to be 6.2 n/spl epsiv/ and 1.59/spl deg//μ/spl epsiv/, respectively, which match the theoretical value of 1.61/spl deg//μ/spl epsiv/ very well.
Keywords :
Bragg gratings; Michelson interferometers; demodulation; fibre optic sensors; optical modulation; compound interference; fiber Bragg grating sensor; phase-shift signal; sensing resolution; sensitivity; strain-induced wavelength-shift; wavelength demodulation; Bragg gratings; Demodulation; Fiber gratings; Interference; Optical coupling; Optical interferometry; Optical sensors; Sensor systems; Strain measurement; Wavelength measurement; Compound interference; fiber Bragg grating (FBG); fiber optics sensor; interferometric demodulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.836907
