Distributed Strain and Temperature Measurement by Brillouin Beat Spectrum

Author

Yuangang Lu ; Zengguang Qin ; Ping Lu ; Dapeng Zhou ; Liang Chen ; Xiaoyi Bao

Author_Institution

Dept. of Phys., Univ. of Ottawa, Ottawa, ON, Canada

Volume

25

Issue

11

fYear

2013

fDate

1-Jun-13

Firstpage

1050

Lastpage

1053

Abstract

A novel distributed strain and temperature measurement method based on Brillouin beat spectrum (BBS) in a complex index profile fiber are proposed. The BBS corresponds to the optical interaction of different acoustic modes. For a large-effective-area fiber (LEAF), the first peak of BBS is contributed by the first and second acoustic modes, while the second peak in BBS is contributed by the first and third accoustic modes. Through determining power changes in the peaks of BBS due to strain and temperature variation along a LEAF, the distributed strain and temperature can be measured by the homodyne Brillouin optical time-domain reflectometry (BOTDR) without scanning the Brillouin spectrum. The strain and temperature at the end of a 4.5-km LEAF are measured at 3-m spatial resolution in 140 s.

Keywords

Brillouin spectra; distributed sensors; fibre optic sensors; optical time-domain reflectometry; strain measurement; temperature measurement; BBS; BOTDR; Brillouin beat spectrum; LEAF; acoustic modes; complex index profile fiber; distance 4.5 km; distributed strain measurement; distributed temperature measurement; homodyne Brillouin optical time-domain reflectometry; large-effective-area fiber; optical interaction; spatial resolution; strain variation; temperature variation; time 140 s; Brillouin scattering; optical fibers; strain measurement; temperature measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2254709

Filename

6488727