Constant range ultrasonic motion detector

Details Constant range ultrasonic motion detector Constant range ultrasonic motion detector

1982-08-06

1986-08-26

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340501, 367 94, G08B 1316, G08B 2900

Patent

active

046086749

ABSTRACT:
A constant range ultrasonic motion detector features an ambient atmospheric condition sensor which senses the temperature, pressure, and percent relative humidity of the ambient atmosphere and produces therefrom a range compensation signal to adjust the sensitivity of the ultrasonic motion detector for stabilizing the range. The range compensation signal is applied to adapt detector amplifier gain and/or threshold level to the variation between design and ambient conditions. In one embodiment, an analog summing network at the ambient atmospheric sensor outputs provides the range compensation signal and in a second embodiment a microprocessor is operative to provide the range compensation signal.

REFERENCES:
patent: 3838408 (1974-09-01), McMaster
patent: 4420746 (1983-12-01), Malinowski
patent: 4479113 (1984-10-01), McNeilly et al.

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