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


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