Passive infrared detector

Details Passive infrared detector Passive infrared detector

G - Physics

08

B

G08B 13/193 (2006.01)

Patent

CA 2265821

A passive infrared detection system is described which has a wide angular field of view and a flat or nearly flat front surface. Input optical elements direct and/or focus incident peripheral infrared radiation onto one or more internal Fresnel lens arrays and/or a sensitive area of a detector, including radiation having incident angles of less than about 30°. Because of the absence of protruding elements improved performance and greater functionality can be obtained by employing larger or multiple infrared input windows and/or opto-electronic sections without degrading the aesthetic appearance of the unit.

L'invention se rapporte à un système passif de détection de rayons infrarouges, qui a un champ de vision grand angle et une surface avant plate ou presque plate. Des éléments optiques d'entrée dirigent et/ou concentrent des rayons infrarouges périphériques incidents sur une ou plusieurs batteries de lentilles de Fresnel internes et/ou une zone sensible d'un détecteur, y compris des rayons ayant des angles d'incidence inférieurs à environ 30 DEG . Du fait de l'absence d'éléments saillants, on obtient de meilleurs résultats et une plus grande fonctionnalité au moyen de fenêtres et/ou de sections optoélectroniques d'entrée d'infrarouges plus grandes ou multiples sans nuire à l'esthétique de l'unité de détection.

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