| 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。 ~xsJML
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： c^pQitPv
Warning: At least 3 focal positions are recommended for finding best focus !o?&{"#+
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. P!IA; i
Any MTF results are of questionable value for assessing K\fD ';
the image quality, except in those cases where the user is w2X HY>6];
interested only in the image of a point-like object. The kp<Au)u
image quality for the unacceptable fields varies significan- 00dY?d{[D
tly over a lateral region of 12 Airy disk diameters. ,]: < l
Warning: The MTF results at one or more fields are inaccurate. :Rv+Bm
The mapping between entrance pupil coordinates and exit pupil coordinates $Mw Bt
is nonlinear. The nature of the nonlinearity is such that Code V is not mTWd+mx
able to compute an accurate MTF result. Usually, this condition is \aM-m :J
caused by severe pupil distortion or some discontinuity in the pupil x7<l*WQ
coordinate mapping. In all cases where the pupil coordinate mapping #V]8 FW
has sufficient nonlinearity to cause this warning, the imagery is extremely ,VEE<* 'X
nonstationary (non-isoplanatic) and small changes in object space G"-V6CA[
coordinates will cause large changes in the image of a point source. )uo".n|n~B
Error: The problem described here occurs at the following field(s): 4^:dmeMZ`
Field: 1 <8kCmuGlk
Field: 2 1hi, &h
Field: 3 O#18a, o @
Field: 4 f" *4R
kG
ERROR - For field 4, wavelength 1, rays at the edge of the pupil G/},lUzLg
may be ignored. Check apertures and vignetting for consistency. I(7iD. ^:
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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