Design of an off-axis three-mirror system with high speed for hyperspectral imagers

Guangbiao Gong; Yiquan Ji; Shanbing Zhu; Ruirui Zhang; Weimin Shen

doi:10.1117/12.806373

27 January 2009 Design of an off-axis three-mirror system with high speed for hyperspectral imagers

Guangbiao Gong, Yiquan Ji, Shanbing Zhu, Ruirui Zhang, Weimin Shen

Proceedings Volume 7156, 2008 International Conference on Optical Instruments and Technology: Optical Systems and Optoelectronic Instruments; 71561M (2009) https://doi.org/10.1117/12.806373
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

With the enhancement of the spectral resolution and the extension of the spectral coverage of spectral imager, its prefixing telescopic objective is expected to have a wide passband and large relative aperture. Off-axis three-mirror optical system has such advantages of achromatic, wide spectral range, no-obstruction excellent aberration correction and inactivity to its environmental temperature that it is ideal for prefixing telescopic system of hyper-spectral imagers (HSI). In this paper the aberration characteristic of off-axis three-mirror systems is analyzed. According to the requirement of HSI and through optimization design, an off-axis three-mirror system with high speed is presented. Its F/ number is 2.47, its focal length 360 mm, and its field of view 2.5 degrees. The designed three-mirror objective is compact and diffraction-limited. Its uniqueness is that its secondary mirror is convex spherical so that its manufacture and test difficulty and cost is greatly reduced.

Citation Download Citation

Guangbiao Gong, Yiquan Ji, Shanbing Zhu, Ruirui Zhang, and Weimin Shen "Design of an off-axis three-mirror system with high speed for hyperspectral imagers", Proc. SPIE 7156, 2008 International Conference on Optical Instruments and Technology: Optical Systems and Optoelectronic Instruments, 71561M (27 January 2009); https://doi.org/10.1117/12.806373

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KEYWORDS

Imaging systems

Objectives

Mirrors

Hyperspectral imaging

Imaging spectroscopy

Monochromatic aberrations

Optical design

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