G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 11/02 (2006.01) B60J 1/20 (2006.01) G01L 5/00 (2006.01)
Patent
CA 2475796
A pressure sensor includes an optical waveguide having an optical fiber with a refractive index n1, located in a fiber guide with a refractive index n3, forming an intermediate region. A medium with a refractive index n2 is located in the intermediate region. The refractive indices correspond to the relation n3 > n1 > n2. When subjected to a pressure, the fiber guide is pressed against the optical fiber such that the condition for the total reflection required for the normal optical waveguidance in the optical waveguide is no longer fulfilled, and attenuation takes place. The attenuation is evaluated in a corresponding control unit. The pressure sensor is especially provided for an anti-pinch device in the motor vehicle industry.
L'invention concerne un capteur de pression comportant un guide d'ondes optiques (8) qui comprend une fibre optique (2) d'indice de réfraction n1, située dans un guide-fibre (8) à indice de réfraction n3, avec formation d'un espace intermédiaire (10). Un milieu à indice de réfraction n2 se trouve dans l'espace intermédiaire (10). La relation n3>n1>n2 s'applique aux indices de réfraction. Lors d'une opération de pression, le guide-fibre (6) est comprimé contre la fibre optique (2), de sorte que la condition pour la réflexion totale requise pour le guidage normal d'ondes optiques ne soit plus remplie et qu'une atténuation intervienne. Cette atténuation est évaluée dans une unité de commande (30) correspondante. Le capteur de pression est particulièrement prévu pour un dispositif anticoincement dans le domaine de l'automobile.
Kodl Georg
Reichinger Gerhard
Fetherstonhaugh & Co.
Leoni Bordnetz-Systeme Gmbh
Leoni Bordnetz-Systeme Gmbh & Co.kg
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