Opto-Electronic Engineering, Volume. 40, Issue 9, 57(2013)
The Feature Extraction of Fiber Bragg Grating Based on Nonlinear Fitting of Peak-reflectivity by Sidebands
Considering the requirement of high accuracy, a novel Fiber Bragg Grating (FBG) modulation method to fit the FBG wavelength with multi-peak reflectivity is proposed. Application of Levenberg-Marquardt algorithm in fitting of peak-reflectivity by sidebands was discussed. The relation model was researched by reflecting central wavelength and peak-reflectivity of sidebands based on the reflex action of FBG for multi-wavelength source. Levenberg-Marquardt algorithm was used to extract the characters from the reflectance spectra to mark sensing information. Temperature resolution 0.1℃ and strain resolution 0.5 με is respectively obtained. The experimental results show that the new method has something referential value to give a guarantee to suit the high accurate measurement with FBG monitoring system.
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WANG Ju, LIU Yin, ZHANG Weijuan, LI Kun, LIU Jichao, ZHAO Yan. The Feature Extraction of Fiber Bragg Grating Based on Nonlinear Fitting of Peak-reflectivity by Sidebands[J]. Opto-Electronic Engineering, 2013, 40(9): 57
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Received: May. 16, 2013
Accepted: --
Published Online: Sep. 17, 2013
The Author Email: Ju WANG (wangju_1990_2006@yahoo.com.cn)