A Method for Peak Seeking of BOTDR Based on the Incomplete Brillouin Spectrum

Author

Mi Li ; Wenxiang Jiao ; Xianzhi Liuwu ; Yuejiang Song ; Lingqian Chang

Author_Institution

Inst. of Opt. Commun. Eng., Nanjing Univ., Nanjing, China

Volume

7

Issue

5

fYear

2015

Firstpage

1

Lastpage

10

Abstract

Distributed fiber sensing technology based on a Brillouin optical time domain reflectometer is widely applied for health monitoring in engineering. However, it cannot perceive quick external interference. In this paper, we propose to use polynomial fitting on the inverse of an incomplete Brillouin spectrum and find the peak frequency by statistical analysis. Simulation results show that the peak frequency obtained by our method is only 1.096 MHz higher than that by using the Lorenz fitting method on a whole discrete Brillouin spectrum. The method has high accuracy, good repetitiveness, and high stability and is helpful in health monitoring for situations with interference that lasts for a short time.

Keywords

Brillouin spectra; fibre optic sensors; optical time-domain reflectometry; statistical analysis; BOTDR; Lorenz fitting method; discrete Brillouin spectrum; distributed fiber sensing technology; incomplete Brillouin spectrum; peak seeking; polynomial fitting; statistical analysis; Frequency measurement; Monitoring; Optical fiber sensors; Optical fibers; Scattering; Strain; Brillouin; Fiber optics sensors; Optical sensing and sensors; Scattering; optical sensing and sensors; scattering;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2015.2478696

Filename

7264966