Combined infrasonic and infrared intrusion detection system

Details Combined infrasonic and infrared intrusion detection system Combined infrasonic and infrared intrusion detection system

1996-01-29

1998-08-11

Swann, Olen

Communications: electrical

Condition responsive indicating system

With particular system function

340539, 340554, 340566, 340567, G08B 1322

Patent

active

057932867

ABSTRACT:
An intrusion and alarm sending arrangement having at least one motion sensing device and a first motion signal threshold device has an input connected to said motion sensing device for generating a motion alarm indication in response to a motion signal exceeding a motion threshold determined by said first motion threshold device. At least one infrasonic sensing device is connected to a first infrasonic threshold device having an input connected to said infrasonic sensing device for generating an infrasonic alarm indication in response to an infrasonic signal exceeding an infrasonic threshold determined by said first infrasonic threshold device. A decision device has a motion alarm input and an infrasonic alarm input for respectively receiving said motion alarm indication and said infrasonic alarm indication, and an output, for generating a valid alarm indication upon determining simultaneity of said motion alarm indication and said infrasonic alarm indication. The arrangement may additionally include devices for receiving and sending from other alarm inputs such as smoke detectors, low temperature detectors, "panic" signals, and the like.

REFERENCES:
patent: 4195286 (1980-03-01), Galvin
patent: 4684929 (1987-08-01), Edwards et al.
patent: 5319698 (1994-06-01), Glidewell et al.

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