Imaging optical system including a telescope and an uncooled...

Details Imaging optical system including a telescope and an uncooled... Imaging optical system including a telescope and an uncooled...

2005-11-29

2005-11-29

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S352000, C359S366000, C359S859000, C359S729000

Reexamination Certificate

active

06969840

ABSTRACT:
An all-reflective telescope has, in order, a positive-optical-power primary mirror, a negative-optical-power secondary mirror, a positive-optical-power tertiary mirror, a negative-optical-power quaternary mirror, and a positive-optical-power field lens. The mirrors and lens are axisymmetric about a beam axis. The light beam is incident upon an infrared detector after reflecting from the quaternary mirror. A cooling housing encloses the detector and the field lens, but does not enclose any of the mirrors. An uncooled warm-stop structure outside of the cooling housing but in a field of view of the detector is formed as a plurality of facets with reflective surfaces oriented to reflect a view of an interior of the cooling housing back to the interior of the cooling housing.

REFERENCES:
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patent: 6356388 (2002-03-01), Geyl
patent: 6596997 (2003-07-01), Kaufman

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