NDLI: Strain variation measurement with short-time Fourier transform-based Brillouin optical time-domain reflectometry sensing system

Content Provider	IET Digital Library
Author	Tu, Guojie Zhang, Xuping Zhang, Yixin Ying, Zhoufeng Lv, Lidong
Abstract	A novel technique to perform dynamic strain measurement with a Brillouin optical time-domain reflectometry (BOTDR) sensing system based on short-time Fourier transform (STFT) is proposed. Unlike traditional frequency scanning methods, the proposed system samples the Brillouin backscattering signal directly after it has been downconverted to the intermediated frequency (IF) region. The Brillouin frequency shift (BFS) of the sensing fibre was reconstructed from the recorded time-domain data continuously without dead-time, which provided a much higher refreshing rate of the strain measurement. Therefore, dynamic strain variation over an optical fibre can be measured with a single-end structure that is more flexible and reliable. A 16.7 Hz strain variation on a 12 m section was successfully detected at the end of a 270 m sensing fibre with 4 m spatial resolution and 45 με uncertainty.
Starting Page	1624
Ending Page	1626
Page Count	3
ISSN	00135194
Volume Number	50
e-ISSN	1350911X
Issue Number	Issue 22, Oct (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/50/22
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2014.2470
Journal	Electronics Letters
Publisher Date	2014-10-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Backscatter BFS BOTDR Sensing System Brillouin Backscattering Signal Brillouin Frequency Shift Brillouin Optical Time-domain Reflectometry Brillouin Spectra Dynamic Strain Variation Measurement Fibre Gyros Fibre Optic Sonsor Fourier Transform Spectroscopy Frequency 16.7 Hz Frequency Scanning Method Intermediated Frequency Region Measurement of Mechanical Variables Measurement Uncertainty Mechanical Variables Measurement Optical Refractometry And Reflectometry Optical Sensing Fibre Optical Time-domain Reflectometry Optical Variables Measurement Short-time Fourier Transform Size 270 M STFT Strain Measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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