| 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。 <!!nI%NC
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： <.$,`m,
Warning: At least 3 focal positions are recommended for finding best focus A2_ Ls ;]
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. B$7[8h
Any MTF results are of questionable value for assessing fI}c 71b`
the image quality, except in those cases where the user is %EIUAG
interested only in the image of a point-like object. The ?!m m a\W
image quality for the unacceptable fields varies significan- 8p,>y( o
tly over a lateral region of 12 Airy disk diameters. ,.7vBt6 p
Warning: The MTF results at one or more fields are inaccurate. fLM.k CD?u
The mapping between entrance pupil coordinates and exit pupil coordinates vU 9ek:.l
is nonlinear. The nature of the nonlinearity is such that Code V is not gV`S %
able to compute an accurate MTF result. Usually, this condition is n)CH^WHL&
caused by severe pupil distortion or some discontinuity in the pupil {X]9^=O"
coordinate mapping. In all cases where the pupil coordinate mapping iiN?\OO^~
has sufficient nonlinearity to cause this warning, the imagery is extremely gvr]]}h:O
nonstationary (non-isoplanatic) and small changes in object space c}cG<F
coordinates will cause large changes in the image of a point source. 3N3*`?5c<
Error: The problem described here occurs at the following field(s): ] ut?&&*
Field: 1 \7DCwu[0M
Field: 2 Rk{$S"8S_
Field: 3 eoL0^cZj
Field: 4 ZI y(<0
ERROR - For field 4, wavelength 1, rays at the edge of the pupil |VYr=hj o
may be ignored. Check apertures and vignetting for consistency. S5/p=H :
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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