Reliability-guided Rayleigh backscattering spectrum correlation method for distributed strain measurements in optical fibres

Liujia Suo, Zhenkun Lei, Akihiro Takezawa, Zhanjun Wu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We present a method of reliability-guided Rayleigh backscattering correlation for distributed strain measurements in optical fibres. In this method, a reference Rayleigh-backscattering-spectrum (RBS) range that is larger than the measurement RBS range is defined to extend the matching range. To obtain the best match between reference and measurement spectra, the zero-mean normalized cross correlation (ZNCC) is employed to evaluate the degree of similarity. The path for searching the maximum similarity matching pattern is guided using Newton’s iteration method. The reliability of the computed RBS shift is identified by the ZNCC coefficient distribution. The experiments show that the proposed method has high reliability in computing the RBS shift. Even at a relatively large strain (e.g. 5000 µϵ), the proposed method can stably demodulate the strain within a relative error of −1% and a spatial resolution of 1.6 cm over a 22-meter-long single-mode fibre. This shows that the proposed method has an advantage in regard to relatively large strain measurements.

Original languageEnglish
Pages (from-to)512-520
Number of pages9
JournalJournal of Modern Optics
Volume66
Issue number5
DOIs
Publication statusPublished - 2019 Mar 12
Externally publishedYes

Keywords

  • Distributed strain measurement
  • Rayleigh backscattering spectrum shift
  • cross correlation
  • high reliability
  • optical frequency domain reflectometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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