Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-07-21
1977-08-02
Rolinec, Rudolph V.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, 73293, 350 96R, G01K 2126
Patent
active
040398455
ABSTRACT:
An optical-electrical liquid probe for sensing the presence or absence of a liquid comprises a light emitter and a light receiver housed within a translucent hollow body. When there is no liquid adjacent a sensing part of the body, the light rays from the emitter pass to the receiver by refraction through the walls of the body. The presence of liquid adjacent the sensing part of the body causes the light rays to be refracted in such a manner that they no longer reach the receiver with the result that the state of the receiver changes.
REFERENCES:
patent: 3164663 (1965-01-01), Gale
patent: 3509353 (1970-04-01), Sundblad et al.
patent: 3683196 (1972-08-01), Obenhaus
Bulgheroni Willy
Oberhansli Jurg
Penasa Josef
Stalder Erwin
Hectronic AG
Jecies Saul
Rolinec Rudolph V.
Tokar Michael J.
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