External variable aperture and relay for infra-red cameras
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United States of America Patent
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Oct 19, 2010
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N/A
app pub date -
Aug 14, 2008
filing date -
May 28, 2003
priority date (Note) -
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Abstract
An external optical relay assembly to allow an infrared camera with a fixed aperture to be used with a variety of fore optics, including refractive compound lenses, reflective telescopes, and reflective/refractive lenses, by providing an external, cooled aperture, that can be adjusted to provide effective f-number matching to the fore optic, allowing any f-number fore optic to be used with the infrared camera. This allows users of large families of similar telescopes, for example, to use their inventory of infrared Ritchie-Chrétien telescopes with a single infrared camera, regardless of f-numbers.
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