Interrogation of Ultra-weak FBG Array using Double-pulse and Heterodyne Detection

Tao Liu, Feng Wang, Xuping Zhang, Quan Yuan, Jihui Niu, Lin Zhang, Tao Wei

Research output: Contribution to journalArticle

Abstract

A high performance interrogation method for ultra-weak FBG (UWFBG) using double-pulse and heterodyne detection method is proposed. The perturbation along the UWFBG array is located quickly through the use of double-pulsed optical input waveform. Then the perturbation of fiber is quantified precisely by demodulating the phase of differential signals from a heterodyne configuration. The efficiency of measuring the perturbation is improved by more than 20 times than that of using single probe pulse. In comparison with conventional Rayleigh scattering based approach, the proposed method is supreme in signal-to-noise ratio (SNR), approximately 18 dB higher. The use of differential signaling method can effectively remove the influence from frequency drift of the laser source, making this proposed method capable of measuring low frequency vibration. In our experiment, perturbations with both sinusoidal and triangle waveform were generated to quantitatively evaluate the performance of the proposed method. The minimum detectable fiber length variation is 14.85 nm, and the sensing frequency can be as low as 0.2 Hz.
Original languageEnglish
Number of pages4
JournalIEEE Photonics Technology Letters
DOIs
Publication statusPublished - 2 Mar 2018

Fingerprint

interrogation
perturbation
Rayleigh scattering
Fibers
pulses
Signal to noise ratio
waveforms
fibers
Lasers
triangles
signal to noise ratios
Experiments
low frequencies
vibration
Heterodyne detection
probes
configurations
lasers

Bibliographical note

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keywords

  • Dynamic vibration measurement,
  • Optical fiber interference,
  • Optical fiber sensors,
  • Optical time domain reflectometry,
  • Ultra-weak FBG

Cite this

Liu, Tao ; Wang, Feng ; Zhang, Xuping ; Yuan, Quan ; Niu, Jihui ; Zhang, Lin ; Wei, Tao. / Interrogation of Ultra-weak FBG Array using Double-pulse and Heterodyne Detection. In: IEEE Photonics Technology Letters. 2018.
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Interrogation of Ultra-weak FBG Array using Double-pulse and Heterodyne Detection. / Liu, Tao; Wang, Feng; Zhang, Xuping; Yuan, Quan; Niu, Jihui; Zhang, Lin; Wei, Tao.

In: IEEE Photonics Technology Letters, 02.03.2018.

Research output: Contribution to journalArticle

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AB - A high performance interrogation method for ultra-weak FBG (UWFBG) using double-pulse and heterodyne detection method is proposed. The perturbation along the UWFBG array is located quickly through the use of double-pulsed optical input waveform. Then the perturbation of fiber is quantified precisely by demodulating the phase of differential signals from a heterodyne configuration. The efficiency of measuring the perturbation is improved by more than 20 times than that of using single probe pulse. In comparison with conventional Rayleigh scattering based approach, the proposed method is supreme in signal-to-noise ratio (SNR), approximately 18 dB higher. The use of differential signaling method can effectively remove the influence from frequency drift of the laser source, making this proposed method capable of measuring low frequency vibration. In our experiment, perturbations with both sinusoidal and triangle waveform were generated to quantitatively evaluate the performance of the proposed method. The minimum detectable fiber length variation is 14.85 nm, and the sensing frequency can be as low as 0.2 Hz.

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