Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-11-06
1999-03-30
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73293, 340619, G01F 2300
Patent
active
058892842
ABSTRACT:
A liquid level gauge utilizes a liquid tight plastic envelope carrying an elongate p-c board that has a light source mounted so as to direct light laterally thereof, and a light sensor also mounted so as to receive light from a direction which is lateral of the board. The gauge further has a lens configuration 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. The lens is capable of aiding in the establishment, at the exterior of the envelope, of a path which diverges from the solid reflective path when the exterior of the envelope is surrounded by liquid that has an index of refraction which is different from the index of refraction of the material of which the lens and envelope are constituted. Assembly is significantly simplified as compared with prior, known gauge constructions.
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Allen Stephone
Bittman Mitchell D.
Casco Products Corporation
Lehmann K. Gibner
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