Distributed vibration sensing system using multimode fiber

Details Distributed vibration sensing system using multimode fiber Distributed vibration sensing system using multimode fiber

G - Physics

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G01D 5/32 (2006.01) E21B 47/00 (2006.01) G01M 11/00 (2006.01) G01B 11/16 (2006.01) G01K 11/32 (2006.01) G02B 6/00 (2006.01)

Patent

CA 2725353

An optical time domain reflectometry (OTDR) system is configured to detect Rayleigh backscatter reflected from a multimode sensing optical fiber. The system includes a single spatial mode filtering system to select a single speckle of the Rayleigh backscatter produced in response to an optical pulse launched into the multimode fiber. The detected single speckle may be used for distributed disturbance (vibration) detection.

La présente invention concerne un système de réflectométrie de domaine temporel optique (OTDR) configuré pour détecter une rétrodiffusion de Rayleigh réfléchie à partir dune fibre optique de détection multimode. Le système comprend un système de filtrage en mode spatial unique permettant de sélectionner un chatoiement unique de la rétrodiffusion de Rayleigh produite en réponse à une impulsion optique lancée dans la fibre multimode. Le chatoiement unique détecté peut être utilisé pour la détection de bruit (vibration) réparti(e).

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