Passive infra-red sensor

Details Passive infra-red sensor Passive infra-red sensor

1986-07-16

1988-03-29

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250349, G08B 1318, G01J 508

Patent

active

047345853

ABSTRACT:
A passive infra-red sensor includes a window in a housing which also houses an infra-red detector. The window defines a plurality of infra-red transmitting strips which are separated by Fresnel lens segments or infra-red opaque strips. The infra-red transmitting strips provide short range sensitivity. The Fresnel lens segments where provided give longer range sensitivity.

REFERENCES:
patent: 2198725 (1940-04-01), Smith
patent: 2975284 (1961-03-01), Osborne
patent: 3480775 (1969-11-01), Osborne
patent: 4263585 (1981-04-01), Schaefer
patent: 4275303 (1981-06-01), Mudge
patent: 4317992 (1982-03-01), Stauffer
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4529874 (1985-07-01), Zierhut

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