Dual-band ultrasonic motion detector

Details Dual-band ultrasonic motion detector Dual-band ultrasonic motion detector

1983-11-18

1986-02-11

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340552, G08B 1318

Patent

active

045702470

ABSTRACT:
A motion detector system includes an ultrasonic transmitter, receiver and phase detector which produces as output signals of frequency related to the speed of movement of any moving object in a zone being monitored. The output of the phase detector is fed to two separate bandpass filters having different pass-bands characteristic of the frequencies generated by a human being moving in the zone being monitored. A warning is sounded only when signals have been present in both bands for more than a predetermined period.

REFERENCES:
patent: 3803539 (1974-04-01), McMaster
patent: 3885234 (1975-05-01), Fujimoto

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