Ceiling mounted passive infrared intrusion detector with...

Details Ceiling mounted passive infrared intrusion detector with... Ceiling mounted passive infrared intrusion detector with...

G - Physics

08

B

340/124.4

G08B 13/18 (2006.01) G08B 13/193 (2006.01)

Patent

CA 1259389

ABSTRACT A passive infrared intrusion detector is arranged for mounting to the ceiling of a room to be protected. Infrared radiation from points within the room is focused onto an infrared sensing element by a multi-segment dome-shaped lens. The multi-segment lens in a preferred embodiment has central, downwardly facing beams of infrared sensitivity and other beams of infrared sensitivity at multiple azimuth angles at selected elevation angles.

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