| 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。 myF/_o&Ty
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： /rHl Fl|Wy
Warning: At least 3 focal positions are recommended for finding best focus +v<
\l=
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 0+/ew8~$
Any MTF results are of questionable value for assessing t \-|J SZ
the image quality, except in those cases where the user is 0cq<!{ d
interested only in the image of a point-like object. The tGF3Hw^mS
image quality for the unacceptable fields varies significan- a\}`
f=T
tly over a lateral region of 12 Airy disk diameters. +G)a+r'0Q
Warning: The MTF results at one or more fields are inaccurate.
g([M hf#
The mapping between entrance pupil coordinates and exit pupil coordinates /@&#U bN\
is nonlinear. The nature of the nonlinearity is such that Code V is not h4Xz"i{z
able to compute an accurate MTF result. Usually, this condition is QOY{j
caused by severe pupil distortion or some discontinuity in the pupil \\;y W~
coordinate mapping. In all cases where the pupil coordinate mapping G &08Qb ,N
has sufficient nonlinearity to cause this warning, the imagery is extremely J?Oeuk~[D
nonstationary (non-isoplanatic) and small changes in object space @2;cv?i)
coordinates will cause large changes in the image of a point source. )y{:Uc \4!
Error: The problem described here occurs at the following field(s): %M:$ML6b<
Field: 1 ~K"nm {.
Field: 2 y+KAL{AGK
Field: 3 qae|?z
Field: 4 r A E5.Q!u
ERROR - For field 4, wavelength 1, rays at the edge of the pupil [LO=k|&R
may be ignored. Check apertures and vignetting for consistency. ]B$J8.{q0
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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