Apparatus for preventing accidental activations of opto-electron

Details Apparatus for preventing accidental activations of opto-electron Apparatus for preventing accidental activations of opto-electron

1989-07-31

1992-06-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214SW, 250214B, 340556, G01V 904

Patent

active

051265559

ABSTRACT:
An electronic circuit for encoding the emission of radiation generating control systems such as opto-electronic switches to ensure that the radiation they detect, is that of the encoded signal they emit. This is done by testing the received signal at two time intervals; first when the output driver activates the emitter, and again when the emission ceases, to verify the coincidence of the detected signal. If first it proves true and then false, it is considered valid. Optionally, this condition must be met for many consecutive tests in order to enable a valid response. If the detector senses radiation when the emitter is inactive, an anti-coincidence signal is produced to cease further emissions until this condition ends.

REFERENCES:
patent: 3727207 (1973-04-01), Missio et al.
patent: 3967111 (1976-06-01), Brown
patent: 4068222 (1978-01-01), Treviranus
patent: 4507654 (1985-03-01), Stolarczyk et al.

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