Self-diagnostic ultrasonic intrusion detection system

Details Self-diagnostic ultrasonic intrusion detection system Self-diagnostic ultrasonic intrusion detection system

1985-01-15

1987-03-03

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340507, 340510, 340514, 340653, 340554, 340522, 367 94, G08B 2900, G01S 966

Patent

active

046479139

ABSTRACT:
A self-diagnostic ultrasonic motion detection system includes an ultrasonic transceiver operative in a transmit mode and in a receive mode. In normal operation, the ultrasonic transceiver in its transmit mode has a characteristic electrical impedance. Potential electro-mechanical, electrical, acoustical, and other sources of false and failure of alarm situations manifest as changes in the electrical impedance of the transceiver in its transmit mode. The electrical impedance is monitored, changes from the nominal are detected, and a suitable self-diagnostic alarm signal is produced in response thereto.

REFERENCES:
patent: 3665443 (1972-05-01), Galvin
patent: 3760400 (1973-09-01), Galvin et al.
patent: 3801978 (1974-04-01), Gershberg et al.
patent: 3932870 (1976-01-01), Shapiro et al.
patent: 4079363 (1978-03-01), Wilson, Jr.
patent: 4482889 (1984-11-01), Tsuda et al.
patent: 4541080 (1985-09-01), Kodaira

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