Intrusion alarm system

Details Intrusion alarm system Intrusion alarm system

1974-10-29

1976-03-30

Trafton, David L.

Communications: electrical

Systems

Call station

340240, G08B 1320

Patent

active

039478386

ABSTRACT:
An intrusion detection apparatus employing a pressure differential sensor for sensing an entry into a room, building or other enclosure. A fan maintains a pressure differential between the enclosure and the external environment and causes air flow through the sensor. Opening of doors and windows or other intrusions into the enclosure causes changes in sensor air flow and the generation of an electrical signal highly sensitive to the changes. A signal processor processes the signal based upon direction, amplitude and time-period of change to distinguish between intrusion-caused and non-intrusion-caused changes.

REFERENCES:
patent: 3748656 (1973-07-01), Gray et al.
patent: 3829851 (1974-08-01), Evans et al.

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