Circuit arrangement for automatic level control for optical sens

Details Circuit arrangement for automatic level control for optical sens Circuit arrangement for automatic level control for optical sens

1975-11-04

1978-01-10

Caldwell, John W.

Communications: electrical

Systems

Call station

250221, 340258B, 356 5, G08B 1318

Patent

active

040682226

ABSTRACT:
Alarm signals are produced in response to variations in the radiation conditions between a pulsed IR-transmitter and a IR receiver whose output amplitude is adjustable and which is synchronously chopped by the emitted pulses, and the adjustable output signal voltage of the receiver is compared with a reference signal voltage derived from the transmitter in a comparator which is chopped synchronously with the pulse frequency of the transmitter. The comparator is followed by a control voltage generator with an integrator stage for a control element, which controls the output amplitude of the receiver, and a decision unit, to which an alarm means and a control indicator are connected.

REFERENCES:
patent: 3383678 (1968-05-01), Palmer
patent: 3549892 (1970-12-01), Perlman
patent: 3597755 (1971-08-01), Parkin
patent: 3680047 (1972-07-01), Perlman
patent: 3727207 (1973-04-01), Missio et al.
patent: 3816745 (1974-06-01), Primm et al.
patent: 3832056 (1974-08-01), Shipp et al.
patent: 3859647 (1975-01-01), Ross

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