Feature extraction of Brillouin scattering spectrum based on half-interval search frequency sweep method

Tingting Yu, Yongjun Wang, Feng Tian, Xiangjun Xin, Hongyan Zhao, Wenqing Tang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In order to improve the real-time performance of Brillouin optical time-domain analysis (BOTDA) distributed optical fiber sensing system, this paper proposes an extraction method of Brillouin scattering spectrum based on half-interval search frequency sweep. This method shortens measurement time by reducing the frequency sweep range, and provides a simplified Brillouin gain spectrum. Cross-correlation of this spectrum with a standard Lorentz curve, then the ideal Lorentz line type near the peak of the convolution result is used for frequency shift feature extraction. And the estimated value of Brillouin frequency shift (BFS) can be calculated by the result of frequency shift feature extraction. A 15km Rayleigh BOTDA temperature sensing experiment is designed to verify the reliability of the method. The results show that this method avoids extension of measuring time caused by the complex iterative process, and reduces frequency sweep time. It has better real-time performance and measurement accuracy than traditional Lorenz curve fitting (LCF) which based on the Levenberg-Marquardt (LM) algorithm.

Original languageEnglish
Title of host publicationTenth International Conference on Information Optics and Photonics
EditorsYidong Huang
PublisherSPIE
ISBN (Electronic)9781510625792
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event10th International Conference on Information Optics and Photonics - Beijing, China
Duration: 8 Jul 201811 Jul 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10964
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference10th International Conference on Information Optics and Photonics
Country/TerritoryChina
CityBeijing
Period8/07/1811/07/18

Keywords

  • Brillouin optical time domain analysis
  • Brillouin scattering spectrum
  • bisection frequency sweep
  • cross-correlation convolution

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Cite this

Yu, T., Wang, Y., Tian, F., Xin, X., Zhao, H., & Tang, W. (2018). Feature extraction of Brillouin scattering spectrum based on half-interval search frequency sweep method. In Y. Huang (Ed.), Tenth International Conference on Information Optics and Photonics Article 109645O (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10964). SPIE. https://doi.org/10.1117/12.2506394