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Continuously Variable Aperture Cold Stop

Sponsor / Contract:  US Army

Project Term: January 2003 December 2004


Current IR camera systems employ fixed sized apertures typically matched to a given f/# lens.  For best performance, apertures must be manually swapped to accommodate changes in optics f/#.  No provisions are currently available for changing aperture sizes to accommodate changes in scene brightness in IR cameras.


Develop a variable aperture cold stop compatible with existing IR camera systems.


Substantial increase in IR camera performance when using multiple f/# optical systems and under conditions of dynamic brightness. 

Completed Phase I Continuously Variable Aperture Cold Stop in pour-fill dewar with a manual manipulator.


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Last modified: March 30, 2006