| 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。 q}p$S2 `
在目镜和物镜分别优化之后，将二者组合在一起时发现Quick 2D能正常显示，但是MTF图线无法显示，有报错，如下： EGI$= Y
Warning: At least 3 focal positions are recommended for finding best focus cQ <|Of
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. z\<,}x}V
Any MTF results are of questionable value for assessing xO :h[
the image quality, except in those cases where the user is VDOC>
interested only in the image of a point-like object. The !pU^?Hy=
image quality for the unacceptable fields varies significan- 9=$ p V==
tly over a lateral region of 12 Airy disk diameters. Uu8ayN j
Warning: The MTF results at one or more fields are inaccurate. 0`.&U^dG
The mapping between entrance pupil coordinates and exit pupil coordinates 7]Qxt%7/>
is nonlinear. The nature of the nonlinearity is such that Code V is not evZP*N~G
able to compute an accurate MTF result. Usually, this condition is M/Z$?nd_H
caused by severe pupil distortion or some discontinuity in the pupil @ NDcO,]
coordinate mapping. In all cases where the pupil coordinate mapping :0(^^6Q\
has sufficient nonlinearity to cause this warning, the imagery is extremely {hN\=_6*EW
nonstationary (non-isoplanatic) and small changes in object space |LJv*
coordinates will cause large changes in the image of a point source. b=S"o
)>
Error: The problem described here occurs at the following field(s): cly p0`,7
Field: 1 !BW!!/U
Field: 2 Ga9iPv
Field: 3 k@% 5P-e}
Field: 4 }~&0<8m
ERROR - For field 4, wavelength 1, rays at the edge of the pupil !21G $ [H
may be ignored. Check apertures and vignetting for consistency. 1H.;r(c
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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