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Proceedings Paper

A new effective combined design method of optics and baffles for low obscuration ratio three-mirror system
Author(s): Zhibo Liao; Tingcheng Zhang; Yang Li; Dali Liu
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Paper Abstract

:A new effective combined design method for low obscuration ratio (OR) three-mirror imaging system is proposed, which involves the correction of varied aberrations, such as spherical aberration, coma, astigmatism, etc., as well as the control of the OR introduced by the secondary mirror’s (SM) baffle effect at the optical design stage. The initial theoretical works include the derivation of the all-spherical system’s 3th-order aberration equations and the calculation of the baffles’ edge coordinates using paraxial ray-tracing. Next,the aberration equations are solved with the boundary conditions of suppressing stray lights to determine the focal powers and first-order parameters of each mirror. And then the system’s initial configuration is obtained as the starting point. During the optimization, conic aspheric surfaces are employed to correct aberrations with the consideration of decreasing the manufacture cost and fabrication difficulties. Meanwhile, the relationship between the SM’s baffle size and the baffles’ edge coordinates based on real ray-tracing is built to minimize the obscuration. Finally, a three- aspheric-mirror system with low OR and high imaging performance is achieved. An infrared-middle-wave system design of % OR is shown and the design result shows that the system’s limited spatial frequency is 33lp/mm and the MTFs of each field-of-view approach the diffraction limits. The stray-light analysis results utilizing FRED software verify the stray light suppression effectiveness of the baffles design of the proposed method.

Paper Details

Date Published: 24 October 2017
PDF: 9 pages
Proc. SPIE 10463, AOPC 2017: Space Optics and Earth Imaging and Space Navigation, 104631V (24 October 2017); doi: 10.1117/12.2285907
Show Author Affiliations
Zhibo Liao, Beijing Institute of Space Mechanics and Electricity (China)
Tingcheng Zhang, Beijing Institute of Space Mechanics and Electricity (China)
Yang Li, Beijing Institute of Space Mechanics and Electricity (China)
Dali Liu, Beijing Institute of Space Mechanics and Electricity (China)


Published in SPIE Proceedings Vol. 10463:
AOPC 2017: Space Optics and Earth Imaging and Space Navigation
Carl Nardell; Suijian Xue; Huaidong Yang, Editor(s)

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