Intrusion alarm apparatus

Details Intrusion alarm apparatus Intrusion alarm apparatus

1975-11-21

1978-07-25

Pitts, Harold I.

Communications: electrical

Condition responsive indicating system

With particular system function

340522, 340552, 340558, G08B 1314

Patent

active

041032934

ABSTRACT:
An intrusion detection apparatus employing two or more diverse types of sensors for sensing entries into a room, building or other enclosure. The sensors are connected to a signal processor which processes sensor output signals to indicate when an intrusion has occured. One type of sensor is a local sensor which includes a sensor conductor in combination with a phase locked loop. Whenever an intruding object is within close proximity to the sensor conductor and disturbs the conductor field, the equilibrium condition of the phase locked loop is disturbed to provide a sensor output signal. A second type of sensor includes in one embodiment an omni-directional antenna having a field which is located in close proximity to or which is overlapping the field of the sensor conductor. Whenever the omni-directional antenna and the sensor conductor are disturbed, the two disturbances are detected by the signal processor to signal an intrusion if the proper time relationship exists between them.

REFERENCES:
patent: 3697972 (1972-10-01), Brown
patent: 3733602 (1973-05-01), Cuckler
patent: 3778807 (1973-12-01), Ralston
patent: 3873981 (1975-03-01), Bloice
patent: 3886413 (1975-05-01), Dow
patent: 3932870 (1976-01-01), Shapiro
patent: 3940733 (1976-02-01), Johnson
patent: 3967161 (1976-06-01), Lichtbau

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