Physical quantity variations sensor

G - Physics – 01 – D

Patent

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Details

G01D 5/38 (2006.01) G01D 5/26 (2006.01)

Patent

CA 2148608

Detector of variations in a physical quantity such as temperature, light intensity or pressure. According to the invention, the detector comprises an optical interferometric cavity (6) composed of two holographic glass plates on which three-dimensional interferometric networks have been previously recorded, said glass plates being placed adjacent to one another with a thin air layer in between, said physical quantity being capable of acting on said cavity; a laser beam generator (1) directing its coherent beam on said cavity; and a receiver (8) which captures light (7) reflected by said optical cavity or having traversed said optical cavity and capable of showing variations in the interference fringes induced by said variations in the physical quantity.

2148608 9410538 La présente invention se réfère à un détecteur de variations d'une grandeur physique telle que température, intensité lumineuse ou pression. Selon l'invention, ce détecteur comporte une cavité optique interférométrique (6) composée de deux plaques holographiques en verre sur lesquelles des réseaux interférométriques tridimensionnels ont préalablement été enregistrés et qui sont appliquées l'une sur l'autre en enfermant entre elles une mince couche d'air, ladite grandeur physique étant susceptible d'agir sur cette cavité; un générateur de faisceau laser (1) dirigeant son faisceau cohérent sur ladite cavité; et un récepteur (8) qui capte la lumière (7) réfléchie par ladite cavité optique ou ayant parcourue ladite cavité optique et qui est susceptible de faire apparaître les variations des franges d'interférence dues auxdites variations de la grandeur physique.

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