Optical laser security system

Details Optical laser security system Optical laser security system

1975-06-16

1976-10-19

Swann, III, Glen R.

Communications: electrical

Systems

Call station

250199, 250578, 340276, G08B 1318

Patent

active

039874281

ABSTRACT:
An optical laser is operated in a continuous mode and modulated by a random noise generator. The laser beam is split into parallel beams which are reflected throughout the area by mirrors and each directed into a photo sensitive electronic receptor circuit which electronically combines the output signals of the parallel beams of laser light. The combined output is electronically compared with the signal employed to modulate the laser beams, with an alarm circuit triggered when any difference is detected between the output signal generated by the laser beams and the input modulating signal.

REFERENCES:
patent: 3120654 (1964-02-01), Lee
patent: 3153196 (1964-10-01), McGuire
patent: 3623057 (1971-11-01), Hedin et al.
patent: 3719938 (1973-03-01), Perlman
patent: 3727207 (1973-04-01), Missio et al.
patent: 3898639 (1975-08-01), Muncheryan

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