| 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。 [{c8:)ar
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： 9"aTF,'F/
Warning: At least 3 focal positions are recommended for finding best focus s`TBz8QO$
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. gI%n(eY
Any MTF results are of questionable value for assessing u}h'v&"e,
the image quality, except in those cases where the user is He@= bLLa
interested only in the image of a point-like object. The 7xcYM
image quality for the unacceptable fields varies significan- x$p\ocA
tly over a lateral region of 12 Airy disk diameters. u, ]yd*
Warning: The MTF results at one or more fields are inaccurate. G?g7G,|d
The mapping between entrance pupil coordinates and exit pupil coordinates *w6 N &
is nonlinear. The nature of the nonlinearity is such that Code V is not Xg)yz~Ug
able to compute an accurate MTF result. Usually, this condition is 8]L.E
caused by severe pupil distortion or some discontinuity in the pupil <w A_2S
Y
coordinate mapping. In all cases where the pupil coordinate mapping g-s@m}[T
has sufficient nonlinearity to cause this warning, the imagery is extremely 3k(?`4JJ
nonstationary (non-isoplanatic) and small changes in object space sd6Wmmo
coordinates will cause large changes in the image of a point source. d"cfSH;h
Error: The problem described here occurs at the following field(s): pJ(l=a
Field: 1 kO #`m ]
Field: 2 6]3 ZUH;
Field: 3 yUG5'<lX
Field: 4 t5qAH++axN
ERROR - For field 4, wavelength 1, rays at the edge of the pupil e{O5y8,
may be ignored. Check apertures and vignetting for consistency. |q>Mw-=
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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