| 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。 u-jc8W`Zd
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： jg%mWiKwK7
Warning: At least 3 focal positions are recommended for finding best focus Df2$2VU
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. jG& 8`*|*
Any MTF results are of questionable value for assessing L">jSZW[[
the image quality, except in those cases where the user is N|@ tP:j
interested only in the image of a point-like object. The sD?Ynpt
image quality for the unacceptable fields varies significan- uuh._H} -
tly over a lateral region of 12 Airy disk diameters. Vx5fQ mx
Warning: The MTF results at one or more fields are inaccurate. G eB-4img
The mapping between entrance pupil coordinates and exit pupil coordinates 8
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is nonlinear. The nature of the nonlinearity is such that Code V is not (Nf B+Ue}
able to compute an accurate MTF result. Usually, this condition is z,dF Dl$
caused by severe pupil distortion or some discontinuity in the pupil "9Q_lVI|Q
coordinate mapping. In all cases where the pupil coordinate mapping s{X+0_@Q
has sufficient nonlinearity to cause this warning, the imagery is extremely & jg>X+;
nonstationary (non-isoplanatic) and small changes in object space ]0(ZlpT
coordinates will cause large changes in the image of a point source.
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Error: The problem described here occurs at the following field(s): @J^
Oy 3z
Field: 1 ! ,b&e
Field: 2 q`z1 ht
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Field: 3 #if jQ7(:
Field: 4 ih75 C"
ERROR - For field 4, wavelength 1, rays at the edge of the pupil '@.Lg0`
may be ignored. Check apertures and vignetting for consistency. I`g&>
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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