Circuit arrangement using for a light barrier for detecting shee

Details Circuit arrangement using for a light barrier for detecting shee Circuit arrangement using for a light barrier for detecting shee

1984-02-17

1987-02-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, G01V 904

Patent

active

046424555

ABSTRACT:
A circuit arrangement for a light barrier for detecting absence or presence of an opaque object at a given location, includes an apparatus for transmitting a signal in response to the disposition of the object, an apparatus for receiving the signal, an apparatus for evaluating the received signal, and an apparatus for initiating a follow-up operation in response to the evaluation of the received signal. The transmitting and receiving apparatus is formed as a reflex light barrier, a digital filter is connected between the transmitting and receiving apparatus and the evaluating apparatus includes two parallel-connected bistable flip-flop circuits, wherein one of the flip-flop circuits has an inverted clock input.

REFERENCES:
patent: 3258594 (1966-06-01), Pfeifer
patent: 4149089 (1979-04-01), Idelsohn et al.

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