Intrusion detection system

Details Intrusion detection system Intrusion detection system

1980-04-28

1982-06-01

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340528, 340636, G08B 1300, G08B 1304, G08B 1308

Patent

active

043330932

ABSTRACT:
An intrusion detection system includes a vibration sensor, and a gate circuit operable to provide an output signal only after the vibration sensor produces a first signal, and thereafter a second, separate signal within a preassigned "sensing window" period. To accomplish this, a timer circuit initiated by the sensor determines a timing interval, and a delay circuit coupled to the timing circuit prevents switching of the gate circuit until preset delay time has elapsed. After the delayed time, if a second sensor output signal is received before expiration of the timing interval, the gate circuit switches and passes a signal through an integrated circuit amplifier stage, and a driver circuit to energize an output unit. The sensitivity of the vibration sensor can be adjusted. The integrated circuit stage includes circuitry for maintaining the alarm signal even if the system is switched to off after it goes into alarm. The same stage also checks periodically for a low battery condition, and provides an output warning signal if the battery level falls below a preset level.

REFERENCES:
patent: 3639897 (1972-02-01), Teich
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4139846 (1979-02-01), Conforti

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