Intrusion detection system

Details Intrusion detection system Intrusion detection system

1984-01-09

1986-11-11

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340506, 340512, G08B 1300, G08B 2900

Patent

active

046225412

ABSTRACT:
There is disclosed an intrusion detection system employing vibration sensors which are arranged in a series loop consisting of first and second wires and which loop is terminated by a terminating impedance. Coupled to the wires is a processing circuit which supplies a square wave biasing waveform for the loop and a DC voltage determined by the terminating impedance. By detecting the magnitude of the DC level, the processor can determine if the loop has been opened or shorted or if any one of the sensors in the loop has been activated due to an intrusion. Thus the system described employs two wires for supplying both power and sensing of output signals from the loop being monitored.

REFERENCES:
patent: 3641547 (1972-02-01), Reiss et al.
patent: 3866202 (1975-02-01), Reiss et al.
patent: 3962696 (1976-06-01), Smith et al.
patent: 3967259 (1976-06-01), Lecuyer
patent: 4275391 (1981-06-01), Okamura
patent: 4361740 (1982-11-01), Stockdale
patent: 4385288 (1983-05-01), Bitko
patent: 4466288 (1984-08-01), Grynberg et al.

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