Analysis of phase-shift pulse brillouin optical time-domain reflectometry

Tsuneo Horiguchi, Yuki Masui, Mohd Saiful Dzulkefly Zan

Research output: Contribution to journalArticle

Abstract

Distributed strain and temperature can be measured by using local Brillouin backscatter in optical fibers based on the strain and temperature dependence of the Brillouin frequency shift. The technique of analyzing the local Brillion backscatter in the time domain is called Brillouin optical time domain reflectometry (BOTDR). Although the best spatial resolution of classic BOTDR remains at around 1 m, some recent BOTDR techniques have attained as high as cm-scale spatial resolution. Our laboratory has proposed and demonstrated a high-spatial-resolution BOTDR called phase-shift pulse BOTDR (PSP-BOTDR), using a pair of probe pulses modulated with binary phase-shift keying. PSP-BOTDR is based on the cross-correlation of Brillouin backscatter and on the subtraction of cross-correlations obtained from the Brillouin scatterings evoked by each phase-modulated probe pulse. Although PSP-BOTDR has attained 20-cm spatial resolution, the spectral analysis method of PSP-BOTDR has not been discussed in detail. This article gives in-depth analysis of the Brillouin backscatter and the correlations of the backscatters of the PSP-BOTDR. Based on the analysis, we propose new spectral analysis methods for PSP-BOTDR. The analysis and experiments show that the proposed methods give better frequency resolution than before.

Original languageEnglish
Article number1497
JournalSensors (Switzerland)
Volume19
Issue number7
DOIs
Publication statusPublished - 1 Apr 2019

Fingerprint

Phase shift
phase shift
pulses
spatial resolution
Spectrum analysis
cross correlation
Binary phase shift keying
spectrum analysis
Optical Fibers
Brillouin scattering
Temperature
binary phase shift keying
probes
Optical fibers
subtraction
frequency shift
optical fibers
temperature dependence
high resolution
Experiments

Keywords

  • Brillouin optical time domain reflectometry
  • Brillouin scattering
  • Distributed fiber sensor
  • Fast fourier transform
  • Signal processing
  • Spectral analysis
  • Strain and temperature sensor

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Analysis of phase-shift pulse brillouin optical time-domain reflectometry. / Horiguchi, Tsuneo; Masui, Yuki; Zan, Mohd Saiful Dzulkefly.

In: Sensors (Switzerland), Vol. 19, No. 7, 1497, 01.04.2019.

Research output: Contribution to journalArticle

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