A calibrated 27-km distributed fiber temperature sensor based on microwave heterodyne detection of spontaneous Brillouin backscattered power

Author

Maughan, Sally M. ; Kee, Huai H. ; Newson, Trevor P.

Author_Institution

Optoelectron. Res. Centre, Southampton Univ., UK

Volume

13

Issue

5

fYear

2001

fDate

5/1/2001 12:00:00 AM

Firstpage

511

Lastpage

513

Abstract

Single-ended distributed fiber temperature measurements using the novel technique of microwave (11 GHz) coherent detection of spontaneous Brillouin backscattered power are presented. Anti-Stokes power traces mere obtained for a sensing length of 27.4 km, believed to be the longest yet demonstrated for such spontaneous power measurements. The power dependence on temperature was measured as 0.36/spl plusmn/0.04%/K, and the rms temperature error was less than 3.5 K at the far end of the sensing fiber.

Keywords

Brillouin spectra; backscatter; calibration; fibre optic sensors; heterodyne detection; measurement errors; temperature measurement; temperature sensors; 11 GHz; 27 km; 27.4 km; anti-Stokes power traces; calibrated distributed fiber temperature sensor; microwave coherent detection; microwave heterodyne detection; power dependence; rms temperature error; sensing fiber; sensing length; single-ended distributed fiber temperature measurements; spontaneous Brillouin backscattered power; spontaneous power measurements; Backscatter; Brillouin scattering; Optical fiber sensors; Optical filters; Optical mixing; Optical scattering; Optical sensors; Power measurement; Temperature measurement; Temperature sensors;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.920769

Filename

920769