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1 February 2006 Research on the influence of secondary mirror shadow coefficient upon Pan-Cassegrain system
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Proceedings Volume 6034, ICO20: Optical Design and Fabrication; 603403 (2006)
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China
Pan-Cassegrain (PC) system is a new structure, which originates from the classical Cassegrain system. The most important character of the PC system is that a 4th order aspherical surface, which can be manufactured by using the spherical fabrication technology, is added in front of the primary spherical mirror. The principle of the PC system imaging principle is explained in this paper. And, the correcting lens design of PC system, whose aperture is 300mm and F/# is 10, is studied on conditions as follows: the secondary spherical mirror shadow coefficients are 1/2, 1/3, 1/4 and 1/5, respectively; field angle 2ω=1°. The relations among shadow coefficient, tube length and primary F/# are also analyzed. The results of calculation indicate that, with the reduction of shadow coefficient, the length of system tube will be short, system's aberrations will increase fast, and more correcting lens will be needed. It has a similar character of Cassegrain system and R-C system at this aspect. In practice, choosing an appropriate shadow coefficient is very important in manufacture according to the actual circumstance.
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Chao-Ming Li and Jun-Hua Pan "Research on the influence of secondary mirror shadow coefficient upon Pan-Cassegrain system", Proc. SPIE 6034, ICO20: Optical Design and Fabrication, 603403 (1 February 2006);

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