Dual pressure change intrusion detector

Details Dual pressure change intrusion detector Dual pressure change intrusion detector

1991-06-20

1993-02-09

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340566, G08B 1316

Patent

active

051855933

ABSTRACT:
Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by means of 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.

REFERENCES:
patent: 3543261 (1970-11-01), Burney
patent: 3573817 (1971-04-01), Akers
patent: 3665445 (1972-05-01), Riley, Jr.
patent: 3990069 (1976-11-01), Schuman
patent: 4134109 (1979-01-01), McCormick
patent: 4223304 (1980-09-01), Barowitz
patent: 4241338 (1980-12-01), Spirig
patent: 4306228 (1981-12-01), Meyer
patent: 4586031 (1986-04-01), Grinneiser
patent: 4800293 (1989-01-01), Miller
patent: 4928085 (1990-05-01), DuRand III et al.

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