Infrared intrusion alarm system

Details Infrared intrusion alarm system Infrared intrusion alarm system

1980-07-28

1983-03-22

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340522, 340529, 340565, 340600, G08B 2300, G08B 1712

Patent

active

043778089

ABSTRACT:
An improved dual-sensor infrared intrusion alarm system includes a motion discriminator that renders the system responsive to only radiation-emanating objects that are moving through the system's scope of surveillance. A positive or negative sensor signal is developed depending on the relative amounts of radiation impinging on the sensors. A switching amplifier selectively discharges one of two capacitors depending on the polarity of the sensor signal. The voltages across the capacitors are coupled to the inputs of a voltage comparator and the capacitor recharge time constants are selected so that an alarm is indicated only when the length of the time interval between the occurrence of a sensor signal of a given polarity and the subsequent occurrence of a sensor signal of the opposite polarity is within prescribed limits, for example, two seconds.

REFERENCES:
patent: 3691558 (1972-09-01), Hoard et al.
patent: 3858192 (1974-12-01), Fischer
patent: 4179691 (1979-12-01), Keller

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