ALEXANDRIA, Va., Jan. 8 -- Nahum Gat of Manhattan Beach, Calif., and John Dwight Garman of Costa Mesa, Calif., have developed cryogenically cooled adjustable apertures for infrared cameras.
According to the U.S. Patent & Trademark Office the invention consists of "a continuously variable diaphragm or swappable fixed aperture for use in thermal infrared cameras, which aperture or diaphragm can be cooled to cryogenic temperatures."
"The invention contemplates mounting aperture control means, if necessary, in a vacuum or extending the control mechanism through a vacuum in a thermally isolated manner to avoid radiation load on the photocell," it continued.
An abstract of the invention, released by the Patent Office, said: "The inventive method implements such a diaphragm and control system. The invention makes possible the object of using a single thermal infrared camera under a wide variety of target-scene radiation conditions that may be rapidly changing, with interchangeable or zoom camera lenses requiring matching or different size cold stops, and under other such dynamic situations."
The inventors were issued U.S. Patent No. 7,157,706 on Jan. 2.
The patent has been assigned to Opto-Knowledge Systems Inc., Torrance, Calif.
The original application was filed on May 28, 2003.
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