Optical arrangement for an infrared intrusion detector

Details Optical arrangement for an infrared intrusion detector Optical arrangement for an infrared intrusion detector

1981-10-13

1984-01-31

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, G01J 100

Patent

active

044292244

ABSTRACT:
The optical arrangement for an infrared intrusion detector containing a plurality of separate radiation receiving regions or fields of view is provided with a first focussing optic or optical system, for instance a Fresnel lense which receives with its entire surface or area the infrared radiation which arrives from all of the receiving regions and delivers such received radiation to a multiplicity of further focussing means, for instance to individual reflectors. These reflectors are correlated in each instance to one of the receiving regions or fields of view and focus the radiation arriving from such receiving region upon a sensor element. In this way there is attained the beneficial result of optimum utilization of the infrared radiation which is available and the sensitivity of the infrared intrusion detector can be increased. The dimensions of the optical arrangement and the intrusion detector can be maintained small and relatively imperceptible.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 3760399 (1973-09-01), Schwarz
patent: 3829693 (1974-08-01), Schwarz
patent: 3958118 (1976-05-01), Schwarz
patent: 4081680 (1978-03-01), Keller
patent: 4166955 (1979-09-01), Keller
patent: 4238675 (1980-12-01), Turlej et al.
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4342987 (1982-08-01), Rossin

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