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Proceedings Paper

Design of a long focal length mid-wavelength infrared optical system
Author(s): Jing Duan; Zhanpeng Zhang; Kai Liu; Qiusha Shan; Kai Jiang; Peipei Yan
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Paper Abstract

Based on a 640×512 cooled staring focal plane array (FPA) detector, pixel size 15μm×15μm, a long focal length mid-wavelength infrared optical system was designed. In this paper, the working wavelength is 3μm~5μm, the temperature range is -30°C~+50°C, this system can realize 1000mm focal length, the F-number is 4, the full field of view is 0.70°, satisfy 100% cold shield efficiency. A re-imaging refractive system was adopted in this designed optical system consists of a main objective group and a projection group. First of all, the structural selection and the initial parameter calculation were introduced. Secondly, on the basis of variety of the temperature, a focusing len 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 ghost image were described particularly. The design results prove that at the spatial frequency of 33 lp/mm, the axis MTF of the optical system is greater than 0.35, the system can offer a high resolution and excellent images, and it has the advantages of good adaptability, simple structure, easy to adjust, and high transmittance.

Paper Details

Date Published: 20 February 2018
PDF: 9 pages
Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 106971O (20 February 2018); doi: 10.1117/12.2314992
Show Author Affiliations
Jing Duan, Xi'an Institute of Optics and Precision Mechanics (China)
Zhanpeng Zhang, Xi'an Institute of Optics and Precision Mechanics (China)
Kai Liu, Xi'an Institute of Optics and Precision Mechanics (China)
Qiusha Shan, Xi'an Institute of Optics and Precision Mechanics (China)
Kai Jiang, Xi'an Institute of Optics and Precision Mechanics (China)
Peipei Yan, Xi'an Institute of Optics and Precision Mechanics (China)
Univ. of the Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 10697:
Fourth Seminar on Novel Optoelectronic Detection Technology and Application
Weiqi Jin; Ye Li, Editor(s)

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