Optics for infrared intrusion detector

Details Optics for infrared intrusion detector Optics for infrared intrusion detector

1979-06-14

1980-12-09

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 100

Patent

active

042386756

ABSTRACT:
An infrared intrusion detector has an optical system for gathering infrared radiation from discrete sensitive regions and focusing such received radiation onto an infrared radiation sensor. The detector includes a monitoring device to sound an alarm when radiation sensed reaches a predetermined level. The optical system comprises an optical collector for gathering radiation from a field which includes the sensitive regions and for converging such radiation onto a plurality of reflectors. Each reflector determines one of the discrete sensitive regions and, in turn, is oriented to reflect converging radiation gathered from a sensitive region on the detector. The invention provides a simple, efficient optic system for a broad field of gathering infrared radiation, concentrating and focusing it in a manner to provide sufficient levels of received radiation for purposes of detection.

REFERENCES:
patent: Re29082 (1976-12-01), Schwarz
patent: 3703718 (1972-11-01), Berman
patent: 3728545 (1973-04-01), Abel
patent: 3886360 (1975-05-01), Reiss et al.
patent: 3923382 (1975-12-01), Harding
patent: 3958118 (1976-05-01), Schwarz
patent: 3972598 (1976-08-01), Kunz
patent: 4052716 (1977-10-01), Mortensen

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