Acta Photonica Sinica, Volume. 42, Issue 8, 950(2013)
Design of Wide Fieldofview Offaxis Threemirror Telescope for Imaging Spectrometer
Space and airborne remote sensing urgently require large relative aperture and wide fieldofview imaging spectrometer. Its telescope must have large relative aperture, wide field of view, telecentric image space, and high image quality. Based on the geometric imaging theory of commonaxis threemirror systems, the design problem of large relative aperture, wide fieldofview, telecentric offaxis threemirror anastigmatic (TMA) telescope are studied. The procedure for calculating initial structural parameter is programmed. By means of field of view offaxis, an telecentric offaxis threemirror telescope system is designed. The spectral range is 200~1 000 nm, the focal length is 210 mm, the relative aperture is 1∶2.5, and the field of view is 14°. The primary mirror and third mirror are sixorder aspheric surfaces, and the second mirror is a quadratic surface. RMS diameter of the spot diagram is less than 16 μm, 80% of the enclosed energy is in a pixel, the MTF is more than 0.75 at Nyquist spatial frequency 22.2 lp/mm, the distortion is less than 0.2%, and each specification satisfy the application requirement.
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CHEN Wei, XUE Chuang. Design of Wide Fieldofview Offaxis Threemirror Telescope for Imaging Spectrometer[J]. Acta Photonica Sinica, 2013, 42(8): 950
Received: Dec. 27, 2012
Accepted: --
Published Online: Sep. 25, 2013
The Author Email: Wei CHEN (xue_ciomp@163.com)