A fully distributed simultaneous strain and temperature sensor using spontaneous Brillouin backscatter

Author

Parker, T.R. ; Farhadiroushan, M. ; Handerek, V.A. ; Roger, A.J.

Author_Institution

Dept. of Electron. & Electr. Eng., King´s Coll., London, UK

Volume

9

Issue

7

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

979

Lastpage

981

Abstract

We report here the first simultaneous measurement of strain and temperature using Brillouin backscatter in an optical fiber. A new sensor arrangement is presented which allows the distributed measurement of Brillouin spectra. Simultaneous measurement of spontaneous Brillouin power and Brillouin shift distributions are made from these spectra, and from this information, we obtain fully distributed measurements of strain and temperature. Our sensor achieves a 100-μ/spl epsiv/ strain and 4/spl deg/C temperature resolution, with 40-m spatial resolution, over a sensing length of 1200 m.

Keywords

Brillouin spectra; backscatter; fibre optic sensors; optical fibres; spectral methods of temperature measurement; strain sensors; temperature sensors; 1200 m; Brillouin shift distributions; distributed measurement; distributed simultaneous strain/temperature sensor; optical fiber; sensing length; spatial resolution; spontaneous Brillouin backscatter; spontaneous Brillouin power; strain measurement; strain resolution; temperature measurement; temperature resolution; Bragg gratings; Brillouin scattering; Capacitive sensors; Frequency measurement; Optical fiber communication; Optical fiber sensors; Power measurement; Strain measurement; Temperature distribution; Temperature sensors;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.593372

Filename

593372