Distributed brillouin sensor system based on dfb lasers...

G - Physics – 01 – D

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G01D 5/353 (2006.01) G01K 11/32 (2006.01) G01L 1/24 (2006.01)

Patent

CA 2590968

A distributed Brillouin sensor system is provided. The system has two distributed feedback (DFB) lasers, which are locked at the Brillouin frequency of the optical fiber through offset locking method by coupler splitting into two parts. The split parts are sent to two photodiodes, the outputs of which are sent to a mixer. A PID controller means follows the mixer and a current controller follows the PID controller. The lasers have a wavelength of 1550nm. The PID controller locks the frequency difference. An optical delay line is used to produce the frequency tuning of the two DFB lasers around the Brillouin frequency of the optical fibers. The lock-in amplifier is used to keep the DC level of the optical modulator at minimum.

La présente invention concerne un système de capteur Brillouin réparti. Ce système comporte deux lasers à rétroaction distribuée (DFL), qui sont verrouillés sur la fréquence de Brillouin de la fibre optique par le biais d'une méthode de verrouillage décalé par un accouplement qui se sépare en deux parties. Les parties séparées sont envoyées vers deux photodiodes, don't les signaux de sortie sont transmis à un mélangeur. Un dispositif de contrôle d'identification des paramètres (PID) suit le mélangeur et un régulateur de courant suit le contrôleur PID. Les lasers ont une longueur d'onde de 1 550 nm. Le contrôleur PID verrouille la différence de fréquence. Une ligne à retard optique est utilisée pour produire la plage de fréquence d'accord des deux lasers DFB à approximativement la fréquence de Brillouin des fibres optiques. L'amplificateur de phase sert à maintenir le niveau de courant continu (c. c.) du modulateur optique à un minimum.

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