A novel demodulation technique for identical weak fiber Bragg grating array sensing with improved performance

Jing Zhang, Muguang Wang, Naihan Zhang, Xiaodi Huang, Desheng Chen*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A novel demodulation method for the sensing system based on an identical weak fiber Bragg grating (IWFBG) array is proposed in this paper. With the help of a wavelength-swept laser, the reflection spectrum and transmission spectrum of an FBG can be mapped into two pulse signals with opposite polarity in time domain, both of which contain the wavelength information of the FBG. Therefore, improved signal intensity and sensing performance can be obtained when the reflection and transmission spectra of the FBG are both adopted for demodulation. A simulation has been done to a quasi-distributed sensing system based on the IWFBG array. The results show that the improvement of the signal intensity is related to the number of the FBGs with the same center Bragg wavelength. The location of the event is realized through the intensity comparison of the pulse signals, and the wavelength change of the FBG can be directly obtained by monitoring the time delay difference between the reference pulse and the sensing pulse.

Original languageEnglish
Title of host publicationOptics Frontiers Online 2020
Subtitle of host publicationDistributed Optical Fiber Sensing Technology and Applications
EditorsJiaqi Yan
PublisherSPIE
ISBN (Electronic)9781510640443
DOIs
Publication statusPublished - 2021
Externally publishedYes
EventOptics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications - Virtual, Online, China
Duration: 28 Aug 202029 Aug 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11607
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceOptics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications
Country/TerritoryChina
CityVirtual, Online
Period28/08/2029/08/20

Keywords

  • Distributed fiber sensing
  • Fiber Bragg grating sensor
  • Fiber sensor
  • Identical weak fiber Bragg grating array
  • Quasi-distributed sensing system
  • Reflection spectrum
  • Transmission spectrum
  • Wavelength-swept laser

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Cite this

Zhang, J., Wang, M., Zhang, N., Huang, X., & Chen, D. (2021). A novel demodulation technique for identical weak fiber Bragg grating array sensing with improved performance. In J. Yan (Ed.), Optics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications Article 116070D (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11607). SPIE. https://doi.org/10.1117/12.2585363