Fiber-Optic Distributed Strain and Temperature Sensing With Very High Measurand Resolution Over Long Range Using Coherent OTDR

Author

Koyamada, Yahei ; Imahama, Mutsumi ; Kubota, Kenya ; Hogari, Kazuo

Author_Institution

Dept. of Media & Telecommun. Eng., Ibaraki Univ., Hitachi

Volume

27

Issue

9

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

1142

Lastpage

1146

Abstract

We describe a novel fiber-optic technique for measuring distributed strain and temperature that uses a coherent optical time-domain reflectometer (OTDR) with a precisely frequency-controlled light source. Using this technique, we achieved temperature measurements in an 8-km-long fiber with a resolution of 0.01degC and a spatial resolution of one meter. This temperature resolution is two orders of magnitude better than that provided by the Brillouin based sensing technique.

Keywords

Brillouin spectra; fibre optic sensors; optical time-domain reflectometry; strain sensors; temperature sensors; Brillouin based sensing; coherent optical time-domain reflectometer; distributed strain sensing; fiber-optic sensing; frequency-controlled light source; measurand resolution; size 8 km; spatial resolution; temperature measurements; temperature resolution; temperature sensing; Brillouin scattering; Optical fiber sensors; Optical scattering; Optical sensors; Rayleigh scattering; Spatial resolution; Strain measurement; Temperature distribution; Temperature measurement; Temperature sensors; Distributed sensor; Rayleigh scattering; fiber sensor; optical time-domain reflectometer (OTDR); strain measurement; temperature measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2008.928957

Filename

4840627