Optical object edge detector using partially covered reference s

Details Optical object edge detector using partially covered reference s Optical object edge detector using partially covered reference s

1990-12-11

1993-02-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214A, G01N 2186, G01N 904

Patent

active

051873753

ABSTRACT:
An edge detector includes a pair of integrated light sensors, a pair of log amplifiers and a comparator amplifier, having a hysteresis voltage applied thereto.

REFERENCES:
patent: 3681605 (1972-08-01), Schmitt
patent: 3751667 (1973-08-01), Quittner
patent: 4812635 (1989-03-01), Kaufmann et al.
patent: 4878753 (1989-11-01), Nestmeier

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