| 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。 _`'VOY`o
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： 1?k{jt~
Warning: At least 3 focal positions are recommended for finding best focus 3.[ fTrzJ
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. "N'|N.,
Any MTF results are of questionable value for assessing /Z':wu\
the image quality, except in those cases where the user is &d1|B`gL|
interested only in the image of a point-like object. The V $'~2v{_
image quality for the unacceptable fields varies significan- k'H+l ]=
tly over a lateral region of 12 Airy disk diameters. l-?B 1gd,l
Warning: The MTF results at one or more fields are inaccurate. :x85:pa
The mapping between entrance pupil coordinates and exit pupil coordinates %ae|4u#b
is nonlinear. The nature of the nonlinearity is such that Code V is not OQl7#`G!H%
able to compute an accurate MTF result. Usually, this condition is mar6/*`I#+
caused by severe pupil distortion or some discontinuity in the pupil QYl
Pr&O9
coordinate mapping. In all cases where the pupil coordinate mapping }2@Aj
has sufficient nonlinearity to cause this warning, the imagery is extremely hn-+]Y:
nonstationary (non-isoplanatic) and small changes in object space k&TZ
coordinates will cause large changes in the image of a point source. LmCr[9/
Error: The problem described here occurs at the following field(s): "}"hQ. kAz
Field: 1 ^r4@C2#vzJ
Field: 2 k
:KN32%
Field: 3 zVeQKN9^Z
Field: 4 kBF.TGT[l
ERROR - For field 4, wavelength 1, rays at the edge of the pupil D cjF $E
may be ignored. Check apertures and vignetting for consistency. 5~ B M+ja
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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