Ultrasonic intrusion alarm system

Details Ultrasonic intrusion alarm system Ultrasonic intrusion alarm system

1979-06-11

1981-04-21

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340384E, 340528, G08B 1316

Patent

active

042636655

ABSTRACT:
An intrusion alarm system for use such as in homes including an ultrasonic motion detector having means for selectively actuating switch means for a light and a sound alarm. The circuit includes a transducer for emitting a beam of ultrasonic energy and a sensor for detecting the modulation of the ultrasonic energy by movement occurring in the beam. The sensor provides a signal in response to said modulation to turn-on an electric light, and to turn-on a sound alarm.

REFERENCES:
patent: 3137846 (1964-06-01), Keeling
patent: 3588866 (1971-06-01), Schlafly, Jr.
patent: 3683346 (1972-08-01), Horton
patent: 3793617 (1974-02-01), Tolman

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