| 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。 Lv m"!!
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： &ws^Dm]R
Warning: At least 3 focal positions are recommended for finding best focus ?Es(pwJB
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 6t F_u D
Any MTF results are of questionable value for assessing N|\Q:<!2_w
the image quality, except in those cases where the user is z~ (3S8$
interested only in the image of a point-like object. The ZGj ^,? a
image quality for the unacceptable fields varies significan- f O ,5
u;
tly over a lateral region of 12 Airy disk diameters. }ej>uZVe<
Warning: The MTF results at one or more fields are inaccurate. |Q+:vb:
The mapping between entrance pupil coordinates and exit pupil coordinates =bJ7!&
is nonlinear. The nature of the nonlinearity is such that Code V is not
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able to compute an accurate MTF result. Usually, this condition is ble[@VW|
caused by severe pupil distortion or some discontinuity in the pupil Ra/Pk G-7
coordinate mapping. In all cases where the pupil coordinate mapping #%7)a; '
has sufficient nonlinearity to cause this warning, the imagery is extremely +^|_vq^XR
nonstationary (non-isoplanatic) and small changes in object space E.eUd4XG
coordinates will cause large changes in the image of a point source. 1Y'NG<d _
Error: The problem described here occurs at the following field(s): wl7 (|\-
Field: 1 7! U^?0?/
Field: 2 MUn(ZnQy|
Field: 3 !
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Field: 4 WT63ve
ERROR - For field 4, wavelength 1, rays at the edge of the pupil @8*lq V2
may be ignored. Check apertures and vignetting for consistency. 6|n3e,&A 2
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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