Dual technology motion sensor

Details Dual technology motion sensor Dual technology motion sensor

1991-06-07

1993-02-23

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340561, 340554, 340555, 367 93, G08B 1900

Patent

active

051893932

ABSTRACT:
A dual technology sensor which uses both ultrasonic and infrared sensors is disclosed. The electronic circuit of the invention requires detection by both sensors to activate the load. Thus, false triggering will not occur unless the false triggering device both emits heat and moves. The avoid having the motion sensor inadvertently turn off while the person is still present, only one of the infrared and ultrasonic sensors is required to be detecting to maintain the activated state.

REFERENCES:
patent: 3725888 (1973-04-01), Solomon
patent: 4660024 (1987-04-01), McMaster
patent: 4882567 (1989-11-01), Johnson
patent: 5077548 (1991-12-01), Dipoala

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