| 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。 <!!nI%NC 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: <.$,`m,
Warning: At least 3 focal positions are recommended for finding best focus A2_Ls;] Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. B$7[8h Any MTF results are of questionable value for assessing fI}c 71b` the image quality, except in those cases where the user is %EIUAG interested only in the image of a point-like object. The ?!m ma\W image quality for the unacceptable fields varies significan- 8p,>y(o tly over a lateral region of 12 Airy disk diameters. ,.7vBt6 p Warning: The MTF results at one or more fields are inaccurate. fLM.kCD?u The mapping between entrance pupil coordinates and exit pupil coordinates vU9ek:.l is nonlinear. The nature of the nonlinearity is such that Code V is not gV`S% able to compute an accurate MTF result. Usually, this condition is n)CH^WHL& caused by severe pupil distortion or some discontinuity in the pupil {X]9^=O" coordinate mapping. In all cases where the pupil coordinate mapping iiN?\OO^~ has sufficient nonlinearity to cause this warning, the imagery is extremely gvr]]}h:O nonstationary (non-isoplanatic) and small changes in object space c}cG<F coordinates will cause large changes in the image of a point source. 3N3*`?5c< Error: The problem described here occurs at the following field(s): ]ut?&&* Field: 1 \7DCwu[0M Field: 2 Rk{$S"8S_ Field: 3 eoL0^cZj Field: 4 ZIy(<0 ERROR - For field 4, wavelength 1, rays at the edge of the pupil |VYr=hjo may be ignored. Check apertures and vignetting for consistency. S5/p=H: 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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