Constant range ultrasonic motion detector

Details Constant range ultrasonic motion detector Constant range ultrasonic motion detector

G - Physics

08

B

349/30

G08B 13/16 (2006.01)

Patent

CA 1209684

A B S T R A C T 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 ultra- sonic 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.

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