Communications: electrical – Systems – Call station
Patent
1975-12-23
1977-05-10
Caldwell, John W.
Communications: electrical
Systems
Call station
307 88ET, 343 5PD, G08B 1316, G01S 966, H04R 1900
Patent
active
040231550
ABSTRACT:
An active ultrasonic perimeter intrusion detection system comprises an elongated flexible electret tape capable of being stored on and deployed from a reel or the like and connectable when deployed to a signal generator operating at ultrasonic frequencies and to a receiver having a signal processing and alarm capability. The tape comprises an electret layer sandwiched between relatively fixed and movable conductive strips and lies flat on a surface adjacent to the area to be protected such as the walls or ceiling of a room or the perimeter of a ground area. The movable stip produces a substantially undirectional ultrasonic beam outwardly from the tape and along its length so as to illuminate objects that cross over the tape. This causes a reflection of the ultrasonic signal and doppler shifting of its frequency which is detected by the tape, the output of which passes to the receiver for indicating the intrusion. One tape preferably functions as the transmitting and receiving transducer, although separate juxtaposed tapes may also be used for these purposes.
REFERENCES:
patent: 3588382 (1971-06-01), Reedyk
patent: 3733581 (1973-05-01), Kalmus
patent: 3750125 (1973-07-01), Ross et al.
patent: 3763482 (1973-10-01), Burney et al.
patent: 3851183 (1974-11-01), Lewiner et al.
patent: 3868624 (1975-02-01), Whitehouse et al.
patent: 3943614 (1976-03-01), Yoshikawa et al.
Caldwell John W.
GTE Sylvania Incorporated
Jay, Jr. Theodore C.
Lawler John F.
Nowicki Joseph E.
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