G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 5/26 (2006.01) E21B 47/00 (2006.01) G01B 11/16 (2006.01) G01K 11/32 (2006.01)
Patent
CA 2692151
To perform distributed sensing with an optical fiber using Brillouin scattering, a light pulse is transmitted into the optical fiber, where the transmitted light pulse has a first frequency. Backscattered light and optical local oscillator light are combined, where the backscattered light is received from the optical fiber in response to the transmitted light pulse, and where the optical local oscillator light has a second frequency. A frequency offset is caused to be present between the first frequency of the transmitted light pulse and the second frequency of the optical local oscillator light, where the frequency offset is at least 1 GHz less than a Brillouin frequency shift of the backscattered light. Spectra representing Stokes and anti Stokes components of the backscattered light are acquired, where the Stokes and anti Stokes components are separated by a frequency span that is based on the frequency offset. To perform distributed sensing with an optical fiber using Brillouin scattering, a light pulse is transmitted into the optical fiber, where the transmitted light pulse has a first frequency. Backscattered light and optical local oscillator light are combined, where the backscattered light is received from the optical fiber in response to the transmitted light pulse, and where the optical local oscillator light has a second frequency. A frequency offset is caused to be present between the first frequency of the transmitted light pulse and the second frequency of the optical local oscillator light, where the frequency offset is at least 1 GHz less than a Brillouin frequency shift of the backscattered light. Spectra representing Stokes and anti Stokes components of the backscattered light are acquired, where the Stokes and anti Stokes components are separated by a frequency span that is based on the frequency offset.
Dans le but d'effectuer une détection distribuée avec une fibre optique à l'aide d'une diffusion de Brillouin, une impulsion lumineuse est transmise dans la fibre optique, l'impulsion lumineuse transmise ayant une première fréquence. La lumière rétrodiffusée et une lumière d'oscillateur local optique sont combinées, la lumière rétrodiffusée étant reçue à partir de la fibre optique en réponse à l'impulsion lumineuse transmise et la lumière d'oscillateur local optique ayant une seconde fréquence. Un décalage de fréquence est provoqué entre la première fréquence de l'impulsion lumineuse transmise et la seconde fréquence de la lumière d'oscillateur local optique, le décalage de fréquence étant inférieur d'au moins 1 GHz à un décalage de fréquence de Brillouin de la lumière rétrodiffusée. Des spectres représentant des composantes de Stokes et anti-Stokes de la lumière rétrodiffusée sont acquises, les composantes de Stokes et anti-Stokes étant séparées par un étalement de fréquence basé sur le décalage de fréquence.
Hartog Arthur H.
Lees Gareth P.
Bp Exploration Operating Company Limited
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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