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http://dx.doi.org/10.3807/KJOP.2019.30.6.219

Design of Cooled Infrared Optical System Considering Narcissus  

Jeong, Su Seong (Electro-Optics 1 Team, Hanwha Systems)
Kim, Young Soo (Electro-Optics 1 Team, Hanwha Systems)
Hong, Jin Suk (Electro-Optics 4 Team, Hanwha Systems)
Lee, Kyoung Muk (Electro-Optics 4 Team, Hanwha Systems)
Yoon, Jee Yeon (Satellite R&D Head Office/Satellite Payload Development Division, Korea Aerospace Research Institute)
Publication Information
Korean Journal of Optics and Photonics / v.30, no.6, 2019 , pp. 219-225 More about this Journal
Abstract
In an infrared optical system, using a cooled detector generates a phenomenon called a narcissus, in which the focal-plane array cooled to very low temperatures is reflected at the lens surface and detected. The narcissus can be removed by non-uniformity correction of the detector pixel, so narcissus is generally ignored in infrared optics. However, non-uniformity correction reduces the sensitivity of the system. Also, as the housing temperature varies due to an environmental temperature change, or a lens is moved for focusing or athermalization purposes, a narcissus may occur even after non-uniformity correction. To minimize such a narcissus, the amount of the effect must be controlled in the lens-design stage. In this paper we designed a midinfrared optical system and analyzed the narcissus by setting the lens surface reflectance to 1%. In addition, the design was divided into stages of an initial design, an improved design, and a minimum design, and the narcissus was improved to about 56% of that in the initial design.
Keywords
Infrared; Infrared camera;
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