Improvements in or relating to the calibration of infra red...

G - Physics – 01 – J

Patent

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G01J 1/02 (2006.01) G01J 5/02 (2006.01) G01J 5/52 (2006.01) H04N 5/33 (2006.01) H04N 17/00 (2006.01)

Patent

CA 2477965

Described herein is an improved reference surface (10) which can be used for calibrating cooled infra red detectors. The reference surface (10) comprises a plurality of corner cube units (12, 14, 16, 18, 20, 22) which reflect radiation directly incident on them. The surface of each corner cube unit (12, 14, 16, 18, 20, 22) is partially reflective and partially emissive so that, when imaged by a cryogenically cooled detector, the reference surface (10) appears as a black body source at a lower temperature than the actual temperature thereof.

La présente invention concerne une surface de référence (10) améliorée qui peut être utilisée pour étalonner des capteurs infrarouges refroidis. Cette surface de référence (10) comprend une pluralité d'unités trièdres (12, 14, 16, 18, 20, 22) qui reflètent un rayonnement directement incident sur elles. La surface de chaque unité trièdre (12, 14, 16, 18, 20, 22) est partiellement réfléchissante et partiellement émissive de façon que, lorsqu'elle est mise en image par un capteur refroidi par cryogénie, la surface de référence (10) apparaît sous forme de source de corps noir à une température inférieure à la température courante de celle-ci.

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