Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-06-24
1993-06-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250561, G01N 2186, G01V 904
Patent
active
052201775
ABSTRACT:
Method and apparatus are provided of a variety wherein a linear array of light emitting diodes (LEDs) are positioned at one side of a material having an edge to be detected. A photoresponsive receiver is positioned on the opposite side of the material at a predetermined stand-off distance from the LED array. The visual LEDs of the array are energized by a drive current which is pre-selected such that light emitting from each exhibits substantially uniform intensity at the photodetecting receiver when non-attenuated by the material. Additionally, the photodetector at the receiver is configured having a length of at least 6 cm to substantially improve edge related data collection. The improvements provide for substantially enhanced measurement accuracy and permit the detection of edges of transparent and semi-transparent materials.
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Harris Instrument Corporation
Nelms David C.
Pham Hoa Q.
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