Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-11-03
1977-12-13
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250209, 340258B, G01D 2104
Patent
active
040630854
ABSTRACT:
The present invention relates to a method of and apparatus for electronic scanning of the kind in which an optical beam emitted and reflected on itself on a catadioptric mirror is displaced rapidly in space so as to sweep over a zone under control, the optical beam being formed by an electro-luminescent diode which projects a continuous train of optical impulses towards the catadioptric mirror, and said reflected impulses are received on a phototransistor device, the train of electrical impulses intended to excite an electro-luminescent diode and formed by a single preparation means being switched electronically in a cyclic manner, while at the same time the photo-transistor associated with the electro-luminescent diode in course of emission is rendered operative, the train of impulses being switched over from one diode to the next following at each impulse, characterized in that in order to ensure the state-by-state progression of the electronic switching circuit, each state validated by this circuit is compared with counting signals obtained independently of this circuit, and the continuation of the sequence is only permitted in the event of agreement, any disagreement due to a missed state or the stoppage of the selector causing the interruption of the sequence and the tripping of an alarm.
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Cometa S. A.
Moore David K.
Smith Alfred E.
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