Optical arrangement for a passive infrared motion detector

Details Optical arrangement for a passive infrared motion detector Optical arrangement for a passive infrared motion detector

1979-05-21

1981-05-19

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250347, G01J 100

Patent

active

042687527

ABSTRACT:
An optical arrangement for a passive infrared motion detector which has an infrared detector unit and a system for directing infrared radiation from at least two separate directions to be monitored onto the detector unit characterized by the system including a single focusing device and separate, flat reflecting surfaces or directing mirrors, which are arranged with at least one flat reflecting surface associated with each direction to be monitored to reflect a beam or solid angle of radiation from the direction onto the single focusing device which device will focus the radiation along a folded beam path to the detector unit.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 4084092 (1978-04-01), Runciman

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