Title :
Demodulation of Fiber Bragg Grating Sensor Using Cross-Correlation Algorithm
Author :
Huang, Chao ; Jing, Wenpeng ; Liu, Kun ; Zhang, Ye ; Peng, Gang-Ding
Author_Institution :
Coll. of Precision Instrum. & Opto-Electron. Eng., Tianjin Univ.
fDate :
5/1/2007 12:00:00 AM
Abstract :
In this letter, a demodulation algorithm for fiber Bragg grating (FBG) sensor is presented. The proposed demodulation algorithm evaluates the wavelength shift in the reflected spectrum of an FBG sensor. It computes the cross-correlation between the perturbed spectrum and the undisturbed spectrum. We compare the proposed algorithm with another three reported algorithms and then discuss the experimental results in respect of the reflective index of FBGs and other factors that may influence the sensing resolution. We report strain resolutions of 0.4 and 1.5 muepsiv in high reflective gratings and low reflective gratings, respectively
Keywords :
Bragg gratings; correlation methods; demodulation; fibre optic sensors; optical fibres; reflectivity; spectral line shift; strain sensors; cross-correlation algorithm; demodulation algorithm; fiber Bragg grating sensor; perturbed spectrum; reflected spectrum; reflective gratings; reflective index; sensing resolution; strain resolution; strain sensor; undisturbed spectrum; wavelength shift; Bragg gratings; Capacitive sensors; Demodulation; Equations; Fiber gratings; Instruments; Sampling methods; Strain measurement; Tunable circuits and devices; Wavelength measurement; Cross-correlation; demodulation algorithm; fiber Bragg grating (FBG); strain sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.895422
