Light gate system

Details Light gate system Light gate system

1975-07-10

1977-03-01

Swann, III, Glen R.

Communications: electrical

Systems

Call station

250221, 340258D, 340276, G08B 1318

Patent

active

040104583

ABSTRACT:
When applying light gates in burglar alarm systems and the like, in which pulsed sources provide pulsed beams of light (which may be UV, visible, or IR radiation), an evaluation circuit is provided coupled to the pulse source which detects coincidence of radiation received when it is being transmitted and also radiation received when none is transmitted, providing an output signal if: (a) no radiation is received when radiation is transmitted, or (b) radiation is received when none is being transmitted, so that phasing of transmitted radiation, as received, with respect to the transmitter becomes an additional recognition factor.

REFERENCES:
patent: 3534351 (1970-10-01), Harnden et al.
patent: 3723737 (1973-03-01), Zeldman et al.
patent: 3859647 (1975-01-01), Ross
patent: 3887815 (1975-06-01), Kawakami
patent: 3889118 (1975-06-01), Walker
patent: 3946241 (1976-03-01), Malinowski

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