Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1993-04-01
1994-09-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250561, G01N 2186, G01V 904
Patent
active
053471350
ABSTRACT:
An improved edge detection and location system of a variety wherein a linear array of radiation emitting devices are selected to emit in the infrared region of the visible spectrum. The emitter array component is employed in conjunction with a silicon photovoltaic receiver and the combination permits greatly expanded spacing between the emitter component and receiver component of the system. A system highly immune to environmental radiation noise is provided which includes an array of IR region emitters performing in conjunction with the same form of IR emitting devices but configured within a photoreceptor circuit. Enhanced edge detection accuracy is achieved through the utilization of multiple rows of emitting devices arranged in parallel and mutually offset by an amount less than the center-to-center spacing of adjacent such devices. An on-site calibration technique is described for calibrating the systems at their intended location so as to achieve uniformity of radiation intensity at the receiver components under conditions of non-attenuation of that radiation.
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Bowman Brent E.
Harris David E.
Allen Stephone B.
Harris Instrument Corporation
Nelms David C.
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