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VariAp® Kit*
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OKSI can design and provide VariAp® Kits for any IR camera
(hermetically sealed Stirling cooled, or repumpable) to replace a fixed cold stop
The VariAp®*:
provides a continuous variable aperture / cold stop (CVA/CS) mechanism to match any f-number
provides a matched f-number for different optical systems that are used with the IR camera
can be set to two stops (a large f-number, and a small f-number) or as fully continuous with position feedback
operates at LN2 temperature and in vacuum.
only adds a low additional heat load on the cooler
motor controller input: 5V or 12V DC; power consumption: 350mW per motor requiring three leads feed through
SPIE Paper: Variable Cold Stop for Matching IR Cameras to Multiple f-number Optics
US Army SBIR Commercialization brochure
US Army SBIR Quality award
* Patented technology


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Last modified: February 23, 2009