| 摘要 |
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.
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