Pressure change intrusion detector

Details Pressure change intrusion detector Pressure change intrusion detector

1992-05-19

1994-11-15

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 340544, 340565, 340566, G08B 1316

Patent

active

RE0347884

ABSTRACT:
Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by using a pressure detection device to detect pressure waves at low and infrasonic frequencies which includes a pressure transducer sensitive to change in pressure to provide an output signal. In some instances an amplifier is provided to amplify the output signal, a signal conditioning circuit is provided to delay a portion of the signal, and a detector device is provided to detect the signal with a comparator provided to compare the signal with the delayed signal and actuate an alarm.
Additionally, a device producing signals responsive to pressure waves and selected sonic frequencies is taught. If the signals are coincidently received at a coincidence detector, an alarm is activated. Further, the signals can be stretched and/or delayed before receipt at the coincidence detector.

REFERENCES:
patent: 3573817 (1971-04-01), Akers
patent: 3914755 (1975-10-01), Hook
patent: 3990069 (1976-11-01), Schuman
patent: 4023156 (1977-05-01), Galvin
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4223304 (1980-09-01), Barowitz et al.
patent: 4306228 (1981-12-01), Meyer
patent: 4333093 (1982-06-01), Raber et al.

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