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

doi:10.1109/LPT.2018.2811411

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 journal › Article › peer-review

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 language	English
Pages (from-to)	677 - 680
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	30
Issue number	8
Early online date	2 Mar 2018
DOIs	https://doi.org/10.1109/LPT.2018.2811411
Publication status	Published - 15 Apr 2018

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.

Funding: This work was supported in part by the National
Natural Science Foundation of China under Grant 61627816, Grant 61540017,
Grant 61405090, and Grant 61107074, and in part by the Fundamental
Research Funds for the Central Universities under Grant 021314380087.

Keywords

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

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title = "Interrogation of Ultra-weak FBG Array using Double-pulse and Heterodyne Detection",

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.",

keywords = "Dynamic vibration measurement,, Optical fiber interference,, Optical fiber sensors,, Optical time domain reflectometry,, Ultra-weak FBG",

author = "Tao Liu and Feng Wang and Xuping Zhang and Quan Yuan and Jihui Niu and Lin Zhang and Tao Wei",

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AU - Wei, Tao

N1 - © 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. Funding: This work was supported in part by the National Natural Science Foundation of China under Grant 61627816, Grant 61540017, Grant 61405090, and Grant 61107074, and in part by the Fundamental Research Funds for the Central Universities under Grant 021314380087.

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N2 - 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.

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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KW - Optical time domain reflectometry,

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

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Keywords

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