Infrared optical system

G - Physics – 01 – J

Patent

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Details

G01J 1/04 (2006.01) G01J 5/06 (2006.01) G02B 13/14 (2006.01)

Patent

CA 2231156

An infrared optical system (100) incorporates a lens (118) imaging a remote scene onto a detector (112) within a cold shield (114). Stray radiation incident on the detector (112) is reduced by an optical stop in the form of a light emitting diode (LED) (126) producing negative luminescence. The LED (126) emits less radiation than background, and contributes less to the detector photon noise than an optical stop not exhibiting negative luminescence.

Un système optique à infrarouges (100) comprend une lentille (118) formant l'image d'une scène éloignée sur un détecteur (112) protégé par un écran froid (114). Les radiations parasites incidentes sur le détecteur (112) sont diminuées grâce à une barrière optique constituée par une diode émettrice de lumière (DEL) (126) produisant une luminescence négative. La DEL (126) émet moins de radiations que le fond et contribue moins au bruit de fond du détecteur de photons qu'une barrière optique ne présentant pas une luminescence négative.

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