Variable sensitivity motion detector

Details Variable sensitivity motion detector Variable sensitivity motion detector

1983-11-08

1987-01-13

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 307117, 367197, G08B 1300, G10K 1100

Patent

active

046367748

ABSTRACT:
The motion detector of the present invention, together with associated AC switching circuitry form a lighting control system which turns on room lights when the room is occupied, and extinguishes the lights when unoccupied. The detector sensitivity or threshold is adjusted in response to the previously detected conditions, providing reliable indication of both entry and continued presence in the controlled area, and producing few false alarms. The present embodiment of the invention has two threshold levels of detection, the higher level being used to detect initial entry into the room. After entry is detected, the motion detector lowers the threshold to detect the weaker signals usually occurring for continued presence in the area of the detector. When the occupant leaves the area, the motion detector threshold or sensitivity returns to the original value after a timeout period.

REFERENCES:
patent: 4225808 (1980-09-01), Saraceni
patent: 4277727 (1981-07-01), LeVert
patent: 4333093 (1982-06-01), Raber et al.
patent: 4344071 (1982-08-01), Allen
patent: 4408308 (1983-10-01), Smith et al.
patent: 4433328 (1984-02-01), Saphir et al.
patent: 4437089 (1984-03-01), Achard

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