Liquid level gauge

G - Physics – 01 – F

Patent

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Details

G01F 23/292 (2006.01)

Patent

CA 2309101

A liquid level gauge (10) utilizes a liquid tight plastic envelope (44) carrying an alongate p-c board (48) that has a light source (52) mounted so as to direct light laterally thereof, and a light sensor (54) also mounted so as to receive light from a direction which is lateral of the board. The gauge further has a lens configuration (45) which is part of the envelope, for providing a largely solid, reflective path for light which emanates at the light source and is to be received at the light sensor. When the exterior of the envelope is surrounded by either air or liquid, changes in the amount of light that is reflected by the lens occur, and are measured by the light sensor (54).

L'invention concerne une jauge (10) de niveau de liquide utilisant une enveloppe (44) en plastique étanche aux liquides qui comporte une carte (48) allongée p-c équipée d'une source (52) lumineuse montée de manière à diriger la lumière latéralement par rapport à celle-ci; et un capteur (54) de lumière également monté de manière à recevoir de la lumière provenant d'un sens latéral par rapport à la carte. La jauge comporte en outre un dispositif (45) de lentille constituant un élément de l'enveloppe, et qui sert à fournir un trajet réflecteur en grande partie solide à la lumière émanant de la source lumineuse et devant être reçue par le capteur de lumière. Lorsque l'extérieur de l'enveloppe est entouré d'air ou de liquide, des modifications de la quantité de lumière réfléchie par la lentille se produisent, et sont mesurées par le capteur (54) de lumière.

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