Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-03-06
1982-06-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250214R, G01N 1506
Patent
active
043330169
ABSTRACT:
A liquid presence detector having a light-transmissive chamber for the liquid to be detected. A light emitting diode is positioned outside of the chamber for transmitting light through the chamber and a photosensitive transistor is positioned for receiving the light that has been transmitted through the chamber. The light emitting diode is located at a distance from the chamber that is equal to the focal point of a lens that is created by the chamber and liquid when the liquid is present. The photosensitive transistor output voltage is compared with a reference voltage and an output signal is provided in response to a predetermined difference between the detector output voltage and the reference voltage.
REFERENCES:
patent: 2980802 (1961-04-01), Bracey et al.
patent: 3549893 (1970-12-01), Gibbs
patent: 3632211 (1972-01-01), Sedivy et al.
patent: 3912393 (1975-10-01), Hossom et al.
patent: 4232967 (1980-11-01), Grachev et al.
Bilstad Arnold C.
Brown Richard I.
Baxter Travenol Laboratories Inc.
Cummings Eugene M.
Flattery Paul C.
Gerstman George H.
Nelms David C.
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