19 October 2016 Design of a mid-wavelength infrared dual field of view zoom system
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Proceedings Volume 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation; 1015416 (2016) https://doi.org/10.1117/12.2246694
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
In order to effectively improve the target detection and recognition ability of IR imagers, based on a 320×256 cooled staring focal plane array(FPA) detector, pixel size 30μm×30μm, a mid-wavelength infrared dual field of view zoom system was designed. In this paper, the working wavelength is 3μm~5μm, the temperature range is -40°C~+50°C, this system can realize 200mm and 400mm dual focal length, the F-number is 2, the full field of view of short focal length is 3.44° and long focal length is 1.72° respectively, satisfy 100% cold shield efficiency. A re-imaging refractive system was adopted in this designed optical system consists of main optics and projection components. First of all, the structural selection and the initial parameter calculation were introduced in detail. Secondly, on the basis of variety of the distance and temperature, a focusing lens was presented in this system to adjust to produce a clear image. Last but not the least, to improve image quality and environment adaptability, the analysis of temperature change and narcissus effect were described particularly. The design results prove that at the spatial frequency of 17 lp/mm, the MTF of the optical system is greater than 0.5(the axis MTF of the optical is greater than 0.6), the system can offer a high resolution and excellent images in whole range of the focal length, and it has the advantages of good adaptability, compact structure, high optical transmission and small size.
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Jing Duan, Jing Duan, Gang Li, Gang Li, Kai Jiang, Kai Jiang, Kai Liu, Kai Liu, Peipei Yan, Peipei Yan, Qiusha Shan, Qiusha Shan, } "Design of a mid-wavelength infrared dual field of view zoom system", Proc. SPIE 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation, 1015416 (19 October 2016); doi: 10.1117/12.2246694; https://doi.org/10.1117/12.2246694
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