G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 9/00 (2006.01) G01L 11/02 (2006.01)
Patent
CA 2303257
A pressure sensor capable of measuring pressure in a harsh environment includes at least one intrinsic fiber optic sensor element formed within a core of an optical fiber. A length of the optical fiber containing the sensor element is attached to a pressure sensitive structure. A dimension of the pressure sensitive structure changes in response to changes in the pressure of a pressure field of the environment. The sensor element is responsive to an input signal and to a strain caused by changes in the dimension of the pressure sensitive structure for providing a pressure signal indicative of the pressure. A temperature compensation sensor is also formed in the fiber near the location of the pressure sensor. The temperature sensor is isolated from strain associated with the pressure for providing temperature compensation of the pressure sensor. Alternatively, temperature compensation is provided by an intrinsic fiber optic sensor element mounted to experience an equal but opposite strain associated with changes in the dimension of the pressure sensitive structure.
L'invention porte sur un manomètre pouvant fonctionner dans des environnements difficiles et comportant au moins un capteur optique à fibre intrinsèque placé dans l'âme de la fibre. La longueur de la fibre optique contenant le capteur est reliée à une structure piézosensible dont l'une des dimensions varie en fonction des variations du champ de pression environnant. Le capteur réagit à un signal d'entrée et à une contrainte résultant de la susdite variation de dimension en fournissant un signal indicatif de la pression. Un capteur à compensation de température est également placé dans la fibre à proximité du capteur de pression. Le capteur de température, qui est isolé des contraintes de pression, fournit une compensation de température au capteur de pression. En variante, la compensation de température peut se faire au moyen d'un capteur optique à fibre intrinsèque monté de manière à subir une contrainte égale mais opposée sous l'effet des variations de dimension de la structure piézosensible.
Cidra Corporation
Marks & Clerk
Weatherford/lamb Inc.
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