Passive infrared detector

Details Passive infrared detector Passive infrared detector

1979-11-01

1982-03-23

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250342, 250353, 340555, 350452, G08B 1318, H01L 900

Patent

active

043215947

ABSTRACT:
A passive infrared intrusion detection system is provided in which one or more Fresnel lenses are employed to focus received infrared energy onto a detector element which provides an electrical output signal indicative of the level of received radiation. The Fresnel lens is preferably formed of a plastic material which is translucent to visible light such that visible light is not focussed onto the detecting element while infrared radiation is.

REFERENCES:
patent: 3203306 (1965-08-01), Lefferts
patent: 3631434 (1971-12-01), Schwartz
patent: 3760399 (1973-09-01), Schwartz
patent: 3839640 (1974-10-01), Rossin
patent: 4024397 (1977-05-01), Weiner
patent: 4052616 (1977-10-01), Keller
patent: 4087688 (1978-05-01), Keller
patent: 4115701 (1978-09-01), Guichard

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