TY - GEN
T1 - A novel demodulation technique for identical weak fiber Bragg grating array sensing with improved performance
AU - Zhang, Jing
AU - Wang, Muguang
AU - Zhang, Naihan
AU - Huang, Xiaodi
AU - Chen, Desheng
N1 - Publisher Copyright:
© 2020 SPIE.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Distributed fiber sensing
KW - Fiber Bragg grating sensor
KW - Fiber sensor
KW - Identical weak fiber Bragg grating array
KW - Quasi-distributed sensing system
KW - Reflection spectrum
KW - Transmission spectrum
KW - Wavelength-swept laser
UR - http://www.scopus.com/inward/record.url?scp=85099484779&partnerID=8YFLogxK
U2 - 10.1117/12.2585363
DO - 10.1117/12.2585363
M3 - Conference contribution
AN - SCOPUS:85099484779
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Optics Frontiers Online 2020
A2 - Yan, Jiaqi
PB - SPIE
T2 - Optics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications
Y2 - 28 August 2020 through 29 August 2020
ER -