Method and apparatus for temperature sensing utilizing...

G - Physics – 01 – K

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G01K 11/32 (2006.01) G01J 5/58 (2006.01) G01J 5/08 (2006.01)

Patent

CA 2462167

A method and apparatus for sensing temperature using optical fiber is provided. In one embodiment, a method for sensing temperature using optical fiber includes launching a polarized optical signal having sufficient intensity to produce Brillouin scattering of the signal into a polarization maintaining optical fiber, receiving a first signal reflected from the launched signal, receiving a second signal reflected from the launched signal; and resolving a metric indicative of temperature from the first and second received signals. The method is particularly useful for sensing temperature in hazardous locations such as down hole gas and oil field applications or other applications where minimization of strain effects to signal transmission is desired.

On présente une méthode et un appareil pour détecter la température en utilisant des fibres optiques. Dans une réalisation, une méthode pour mesurer la température en utilisant des fibres optiques comprend le lancement d'un signal optique polarisé ayant une intensité suffisante pour produire une diffusion Brillouin du signal dans des fibres optiques de maintien de polarisation, recevant un premier signal réfléchi du signal lancé; recevant un second signal réfléchi du signal lancé; et réglant un indicatif métrique de la température depuis le premier signal et le deuxième reçus. La méthode est particulièrement utile pour la détection de la température dans des endroits dangereux tels que le gaz de fond de trou et les applications de champs de pétrole ou d'autres applications où la minimisation des effets de contrainte sur la transmission de signaux est souhaitée.

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