Pressure sensor for fluid using an expansion pipe and fiber...

G - Physics – 01 – L

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G01L 11/02 (2006.01)

Patent

CA 2295011

A device for measurement of pressure in fluids, comprising a cylindrical housing having a pressure port, an inner cavity and an opening. A closed pipe is situated in the cavity and closes the opening in the housing and establishes a cavity between the pipe and the inner wall of the housing. A connection element is situated in the pipe, so that one end of the element is connected to the free end of the pipe for transfer of axial length change of the pipe, whereas the connected element is arranged for establishing a cavity between the connection element and the pipe. An optical fiber is laid in a slot in the external surface of the housing, and comprises a Bragg grating fixed between the housing and the connection organ by fastening points. Pressure induced expansion of the pipe is transferred to the Bragg grating.

Dispositif pour la mesure de pression dans des fluides, comprenant un boîtier cylindrique (101) ayant une prise de pression (103), une cavité interne (102) et une ouverture (102b). Un tuyau fermé (131) situé dans la cavité (102), ferme l'ouverture (102b) du boîtier (101) et définit une cavité (134) entre le tuyau (13) et la paroi interne du boîtier (101). Un élément de raccord (133) est situé dans le tuyau (131), de sorte qu'une extrémité de l'élément (133) est raccordée à l'extrémité libre du tuyau (131) pour le transfert du changement de longueur axiale du tuyau (131), alors que l'élément raccordé (133) est conçu pour définir une cavité (132) entre l'élément de raccord (133) et le tuyau (131). Une fibre optique (171) est placée dans une fente (171) située dans la surface externe du boîtier (101), et comporte un réseau de Bragg (150) fixé entre le boîtier (101) et l'organe de raccord (133) par des points de fixation (151, 152). L'expansion du tuyau (131) induite par la pression est transférée au réseau de Bragg (150).

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