| 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。 +KDB ^{
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： -a]oN:ERb
Warning: At least 3 focal positions are recommended for finding best focus @pY AqX2
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. i+Px &9o<9
Any MTF results are of questionable value for assessing `f* ?|)
the image quality, except in those cases where the user is ; _of'
interested only in the image of a point-like object. The c _O| ?1
image quality for the unacceptable fields varies significan- gx 4`pH;B\
tly over a lateral region of 12 Airy disk diameters. ;QW6Tgt11
Warning: The MTF results at one or more fields are inaccurate. wX#=l?,K
The mapping between entrance pupil coordinates and exit pupil coordinates N|z-s
is nonlinear. The nature of the nonlinearity is such that Code V is not L/<^uO1
able to compute an accurate MTF result. Usually, this condition is el.;T*Wn
caused by severe pupil distortion or some discontinuity in the pupil YQ 4;X8I`r
coordinate mapping. In all cases where the pupil coordinate mapping c 3 P
has sufficient nonlinearity to cause this warning, the imagery is extremely 9 X@y*;w<t
nonstationary (non-isoplanatic) and small changes in object space 5ts8o&|
coordinates will cause large changes in the image of a point source. {]] nQ
Error: The problem described here occurs at the following field(s): engq l;
Field: 1 7zVaj"N(
Field: 2 Bg"b,&/^u
Field: 3 w%VHq z$
Field: 4 K;_p>bI5
ERROR - For field 4, wavelength 1, rays at the edge of the pupil b, ~4O~z
may be ignored. Check apertures and vignetting for consistency. oA"t`, 3
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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