Ultrasonic intrusion alarm system

Details Ultrasonic intrusion alarm system Ultrasonic intrusion alarm system

1978-01-30

1981-03-03

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340507, 340508, G08B 1316

Patent

active

042544831

ABSTRACT:
A number of remotely mountable transmitting heads each has a transducer driven by a sweep frequency ultrasonic signal for generating an ultrasonic field. A number of remotely mountable receiving heads each processes incident doppler shifted energy reflected by a disturbance by developing therefrom a constant amplitude received signal and multiplying this signal by the ultrasonic signal to generate a pair of noise cancelling differential signals. A processor for generates the ultrasonic signal and further processes the received signals so as to detect the disturbance or system tampering.

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patent: 3932870 (1976-01-01), Shapiro et al.
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patent: 3967283 (1976-06-01), Clark et al.
patent: 3976952 (1976-08-01), Shaver
patent: 4032916 (1977-06-01), Galvin et al.

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