Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-04-20
1990-10-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023117, 250237G, 341 13, G01D 534
Patent
active
049654462
ABSTRACT:
The optical interrupter system includes a moving member having a sequence of optical flags, interposed between a source of illumination and a detector, such that as the optical flags of the moving member are illuminated and detected, the detector generates a signal having a waveform with a first portion less than a first threshold, a second portion greater than the first threshold and less than a second threshold, and a third portion greater than the second threshold. Signal processing circuitry operates to generate a count signal indicating a transition between the first and third waveform portions.
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Allen Stephone B.
IVAC Corporation
Nelms David C.
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