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Browse Prior Art Database

OPTICAL LIQUID LEVEL SENSOR

IP.com Disclosure Number: IPCOM000005755D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Nov-02
Document File: 1 page(s) / 53K

Publishing Venue

Motorola

Related People

Daniel J. Smith: AUTHOR [+3]

Abstract

An optical liquid level sensor 10 is disclosed which uses a light source 11 and adetection system to monitor the liquid level in a chamber 12. The advantage of this design is that it removes any electronics from inside the liquid-filled chamber.

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MOlDROLA Technical Developments Volume 8 October 1988

OPTICAL LIQUID LEVEL SENSOR

by Daniel J. Smith, Michael J. Hoss and Daniel Prochaska

   An optical liquid level sensor 10 is disclosed which uses a light source 11 and adetection system to monitor the liquid level in a chamber 12. The advantage of this design is that it removes any electronics from inside the liquid-filled chamber.

   As shown in the accompanying figures, a constant brightness light source 11 is used. The light source projects down into the liquid chamber and is aimed at a reflective plate 13 which floats on top of the liquid 12A. The light which is reflected from this plate is then sensed by an optical detector 14 mounted on the same housing 15 as the optical source 11. This optical detector 14 measures the reflected light intensity in decibels, and then converts this reading into how much liquid 12A is inside the chamber 12 by taking into account any nonlinearities in the geometric configuration of the chamber 12.

   The chamber 12 shown in the figures is designed to be used in applications where the chamber is in a moving environment, for example, a gasoline tank of an automobile. As the automobile moves in directions such as forward, reverse, up and down hills, and right and left turns, the optical source and detector housing 15 would pivot and also move so that the reflected plate 13 would be moved, by the reflective plate rods 16, so that it would be perpendicular to the pull of gravity and,...