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.

Volume

19

Issue

9

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

707

Lastpage

709

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.895422

Filename

4181728