Criterion for subpulse-length resolution and minimum frequency shift in distributed Brillouin sensors

Author

Ravet, Fabien ; Bao, Xiaoyi ; Yu, Qinrong ; Chen, Liang

Author_Institution

Fiber Opt. Group, Univ. of Ottawa, Ont., Canada

Volume

17

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

1504

Lastpage

1506

Abstract

We introduce a Rayleigh equivalent criterion to measure stressed section shorter than the spatial resolution of a distributed Brillouin sensor. Under this criterion for the worst-case of any given sensing length, the minimum resolvable strain length is 1/2 of the pulse length (w) with Brillouin frequency uncertainty of 5% or 0.8w with 2% frequency uncertainty. This is smaller than the pulse length.

Keywords

Brillouin spectra; distributed sensors; fibre optic sensors; measurement errors; optical resolving power; stress measurement; Brillouin frequency uncertainty; Rayleigh equivalent criterion; distributed Brillouin sensors; frequency shift; pulse length; strain length; stress measurement; subpulse-length resolution; Brillouin scattering; Capacitive sensors; Frequency; Pulse measurements; Signal resolution; Spatial resolution; Strain measurement; Stress; Temperature measurement; Temperature sensors; Distributed Brillouin sensor; measurement accuracy; spatial resolution;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.849246

Filename

1453658