A system, device and method for detecting seismic acceleration

G - Physics – 01 – V

Patent

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G01V 1/26 (2006.01) G01B 9/02 (2006.01) G01L 1/24 (2006.01) G01P 15/00 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2744255

A device for detecting seismic acceleration including a proof mass; a base for providing a sensor acceleration, relative to the proof mass, based on the seismic acceleration; an optical fibre portion operatively connected between the proof mass and the base for providing a fibre tension based on the sensor acceleration, a fibre Fabry-Perot interferometer (FFPI) in the optical fibre portion for providing an optical characteristic representative of the fibre tension, and a compensator for applying a compensating tension to the FFPI to compensate for a change of the optical characteristic due to a temperature change of the FFPI.

L'invention porte sur un dispositif, pour détecter une accélération sismique, qui comprend une masse étalon; une base pour fournir une accélération de capteur, par rapport à la masse étalon, sur la base de l'accélération sismique; une partie fibre optique reliée de façon fonctionnelle entre la masse étalon et la base pour fournir une tension de fibre sur la base de l'accélération de capteur, un interféromètre de Fabry-Perot à fibre (FFPI) dans la partie fibre optique pour fournir une caractéristique optique représentative de la tension de fibre, et un compensateur pour appliquer une tension de compensation au FFPI pour compenser un changement de la caractéristique optique en raison d'un changement de température du FFPI.

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