ljwcdtj |
2012-05-17 12:02 |
求CODEV中MTF图线不能显示的原因
小弟用CODEV设计了一个开普勒望远镜。目镜用的是对称式,物镜用了一个双胶合,视觉放大率为12。 #3.\j"b 在目镜和物镜分别优化之后,将二者组合在一起时发现Quick 2D能正常显示,但是MTF图线无法显示,有报错,如下: HgaZbb>' Warning: At least 3 focal positions are recommended for finding best focus KXq_K:r? Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. l0:5q?g Any MTF results are of questionable value for assessing &>g~-s the image quality, except in those cases where the user is 'bC]M3P interested only in the image of a point-like object. The s%^o*LQ|9 image quality for the unacceptable fields varies significan- ^EuW(
" tly over a lateral region of 12 Airy disk diameters. 2uEhOi0I Warning: The MTF results at one or more fields are inaccurate. gJK KR]4* The mapping between entrance pupil coordinates and exit pupil coordinates \q,s?`+B is nonlinear. The nature of the nonlinearity is such that Code V is not 4~Dax) able to compute an accurate MTF result. Usually, this condition is -,|ha>r caused by severe pupil distortion or some discontinuity in the pupil $
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L;j coordinate mapping. In all cases where the pupil coordinate mapping OT;cfkf7 has sufficient nonlinearity to cause this warning, the imagery is extremely ^4 8\>-Q\ nonstationary (non-isoplanatic) and small changes in object space DFc [z"[ coordinates will cause large changes in the image of a point source. NHAH#7]M&1 Error: The problem described here occurs at the following field(s): ,z[(k" Field: 1 GkciA{ Field: 2 eG4>d^`c Field: 3 Dp`HeSKU^ Field: 4 SY|Ez!tU:N ERROR - For field 4, wavelength 1, rays at the edge of the pupil K#wK1 Sv may be ignored. Check apertures and vignetting for consistency. @701S(0'7 这个究竟是什么问题呢?好像是和视场有关。求高人指点。
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