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http://dx.doi.org/10.3807/KJOP.2021.32.4.153

Design of Variable F-number and Triple Magnification Infrared Optical System  

Jeong, Yumee (The 3rd Research and Development Institute, Agency for Defense Development)
Publication Information
Korean Journal of Optics and Photonics / v.32, no.4, 2021 , pp. 153-162 More about this Journal
Abstract
In this article, the design of a variable F-number and triple magnification infrared optical system is described. That is a two-in-one optical system that combines an infrared search and track (IRST) system and an electro-optical tracking system (EOTS), where an afocal optical system is added to the IRST optical system designed already. The performance target is determined by analyzing system performance, and then the specification in the optical system design is calculated. This optical system contains a warm stop making it possible that one optics has two different F/# by cutting the size of aperture, and that is designed to suit this optics. The system satisfies the requirement such as a modulation transfer function (MTF). For operational assessment, the movement of the focusing lens group is analyzed over the change of temperature and target distance. By using this optical system, it is possible to develop equipment having two functions, infrared searching and electro-optical tracking.
Keywords
Infrared camera; Lens design; Optics design;
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