Optical fiber pressure and acceleration sensor fabricated on...

G - Physics – 01 – B

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G01B 9/02 (2006.01)

Patent

CA 2537214

A fiber optic sensor (20) has a hollow tube (26) bonded to the endface (25) of an optical fiber, and a diaphragm (28) bonded to the hollow tube. The fiber endface and diaphragm comprise an etalon cavity (30). The length of the etalon cavity changes when applied pressure or acceleration flexes the diaphragm. The entire structure can be made of fused silica. The fiber, tube, and diaphragm can be bonded with a fusion splice. The present sensor is particularly well suited for measuring pressure or acceleration in high temperature, high pressure and corrosive environments such as oil well downholes and jet engines. The present sensors are also suitable for use in biological and medical applications.

L'invention concerne un capteur à fibre optique comportant un tube creux solidaire de la face d'extrémité d'une fibre optique et un diaphragme solidaire du tube creux. La face d'extrémité de la fibre et le diaphragme forment une cavité d'étalonnage. La longueur de la cavité d'étalonnage change lorsqu'une pression ou une accélération appliquée fléchit le diaphragme. La structure entière peut être composée de silice fondue. La fibre, le tube et le diaphragme peuvent être liés par épissure par fusion. Ledit capteur est particulièrement apte à mesurer une pression ou une accélération dans les milieux corrosifs à pression et température élevées (par exemple, au fond du trou des puits de pétrole et dans des moteurs à réaction). Lesdits capteurs sont aussi appropriés aux applications biologiques et médicales.

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