This article is cited in 14 papers

Optical fibres and fibreoptic sensors

Fibreoptic distributed temperature sensor with spectral filtration by directional fibre couplers

A. G. Kuznetsov, S. A. Babin, I. S. Shelemba

Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk

Abstract: We demonstrate a Raman-based all-fibre temperature sensor utilising a pulsed erbium fibre laser. The sensor is made of a standard single-mode telecom fibre, SMF-28, and includes a number of directional couplers as band-pass filters. The temperature profile along a 7-km fibreoptic line is measured with an accuracy of 2^oC and a spatial resolution of 10 m. In data processing, we take into account the difference in attenuation between the spectral components of the backscatter signal.

PACS: 07.20.-n, 07.60.Vg, 42.55.Wd, 42.79.Sz, 42.81.Pa

Received: 26.06.2009

 English version: Quantum Electronics, 2009, 39:11, 1078–1081

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