Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-10-24
1993-09-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, G01V 904
Patent
active
052451771
ABSTRACT:
A system for detecting the presence of an object within a predetermined detection region. The system comprises a light source for producing a beam of light in the direction of the object to be detected and a pair of light detector units. The light detector units are angularly oriented so that their fields of view intersect to form a detection zone, the portion of the detection zone illuminated by the light beam defining a detection region. The outputs from said light detector units are coupled to an AND gate which, upon simultaneous receipt of output signals from both light detector units, emits a detection signal. If the object is disposed within the detection region and is illuminated by the light source, both light detector units will simultaneously emit an output signal, thereby causing the AND gate to emit a detection signal. In contrast, if the object is disposed outside of the detection region and/or is not illuminated by the light source, only one or none of the light detector units will emit an output signal and the AND gate will not emit a detection signal.
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Hamamatsu Photonics K.K. Aug. 1990 spec sheet for Light Modulation Photo IC S4282-11 (or S3599) and S4285-40.
Kriegsman Edward M.
Kriegsman Irving M.
Lee John R.
Nelms David C.
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