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4 November 1999 Dual-aperture optical system for infrared camera
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Proceedings Volume 3898, Photonic Systems and Applications in Defense and Manufacturing; (1999)
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore
Conventional IR optical systems with high magnification and switchable FOBs suffer form strong unwanted Narcissus effect. This is mainly caused by retro-reflections from the objective lens back to the detector plane. In this project, a new dual aperture optical configuration has been developed to reduce substantially the Narcissus effect while maintaining good optical performance. A design example is presented in this paper. The relative Narcissus Induced Temperature is reduced from about 1.4 degree C to about 0.1 degree C, thus enhancing the detection range of the IR system.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kim-Hwee Lee "Dual-aperture optical system for infrared camera", Proc. SPIE 3898, Photonic Systems and Applications in Defense and Manufacturing, (4 November 1999);

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