Single wire intrusion detector system

Details Single wire intrusion detector system Single wire intrusion detector system

1976-11-12

1979-05-15

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340552, G08B 1324

Patent

active

041550781

ABSTRACT:
A single wire antenna placed in proximity to an area to be protected senses the presence of electromagnetic fields including the normal ambient field and modulation thereof resulting from the presence of a moving intruder. The antenna signals are demodulated and filtered to provide the input to circuitry for inspecting these signals and producing a signal based upon differentiation between normal transient signals and random modulation signals associated with the movement of an intruder. Digital counter circuitry provides the differentiation and various time-out features can be incorporated to control the generation and/or transmission of alarm signals. The system includes various elements to permit easy testing of system operations by the user.

REFERENCES:
patent: 3163861 (1964-12-01), Suter
patent: 3237105 (1966-02-01), Kalmus
patent: 3378834 (1968-04-01), Corbell
patent: 3549892 (1970-12-01), Perlman
patent: 3665445 (1972-05-01), Riley, Jr.
patent: 3673589 (1972-06-01), Barrett et al.
patent: 3727207 (1973-04-01), Missio et al.
patent: 3771152 (1973-11-01), Dettling et al.
patent: 3793617 (1974-02-01), Jolman
patent: 3833897 (1974-09-01), Bell et al.
patent: 3956743 (1976-05-01), Geiszler et al.
patent: 3961321 (1976-06-01), Moss

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