Design of a common-aperture VIS/LWIR imaging optical system with muti-field of view

Jing Duan; Kai Liu; Gang Li; Peipei Yan; Qiusha Shan; Kai Jiang

doi:10.1117/12.2257878

28 February 2017 Design of a common-aperture VIS/LWIR imaging optical system with muti-field of view

Jing Duan, Kai Liu, Gang Li, Peipei Yan, Qiusha Shan, Kai Jiang

Proceedings Volume 10256, Second International Conference on Photonics and Optical Engineering; 102563Z (2017) https://doi.org/10.1117/12.2257878
Event: Second International Conference on Photonics and Optical Engineering, 2016, Xi'an, China

Abstract

In order to achieve the multi-band and multi-field of view imaging for target and to meet the needs of target detection for large amount of information, a common-aperture visible light/long-wave infrared(VIS/LWIR) imaging optical system with muti-field of view was designed. In this paper, the aperture is 400mm, the working wavelength is 500～700nm and 7.5～10μm, the temperature range is -15℃～+50℃, this system can realize 1500mm and 3000mm dual focal length(VIS), the full field of view of short focal length is 1.16° and long focal length is 0.58° respectively, and realize 1400mm focal length(LWIR) and the full field of view of 0.54°, satisfy 100% cold shield efficiency. A re-imaging system was adopted in this designed optical system consists of main optics, VIS projection components and LMIR projection components. First of all, the structural selection and the initial parameter calculation were introduced in detail. Secondly, to improve image quality and environment adaptability, the analysis of temperature change was described particularly and the structural design requirements were put forward according to the analysis of the data. The design results proved that at the spatial frequency of 50 lp/mm, the axis MTF of the VIS system is greater than 0.48, the MTF of the LWIR system approaches the diffraction limit, 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 and small size, the results satisfy the design requirement.

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Jing Duan, Kai Liu, Gang Li, Peipei Yan, Qiusha Shan, and Kai Jiang "Design of a common-aperture VIS/LWIR imaging optical system with muti-field of view", Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 102563Z (28 February 2017); https://doi.org/10.1117/12.2257878

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KEYWORDS

Imaging systems

Optical design

Modulation transfer functions

Optical imaging

Target detection

Temperature metrology

Infrared detectors

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