| 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。 BJgW,huLy
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： on0]vEE
Warning: At least 3 focal positions are recommended for finding best focus uA,>a>xYI
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. ; l&4V
Any MTF results are of questionable value for assessing LUH "
the image quality, except in those cases where the user is 61/. K_%I.
interested only in the image of a point-like object. The a\IP12F?
image quality for the unacceptable fields varies significan- b8$gx:aJ>$
tly over a lateral region of 12 Airy disk diameters. RaWG w
Warning: The MTF results at one or more fields are inaccurate. .fN"@l
The mapping between entrance pupil coordinates and exit pupil coordinates Rlet L)
is nonlinear. The nature of the nonlinearity is such that Code V is not `(v='$6}
able to compute an accurate MTF result. Usually, this condition is %uJ<M-@r=u
caused by severe pupil distortion or some discontinuity in the pupil "VkTY|a
coordinate mapping. In all cases where the pupil coordinate mapping ( Fynok
has sufficient nonlinearity to cause this warning, the imagery is extremely B.g[c97
nonstationary (non-isoplanatic) and small changes in object space ZiYm:$CJ
coordinates will cause large changes in the image of a point source. T<JwD[ (
Error: The problem described here occurs at the following field(s): cE`6uq7 p
Field: 1 4J;-Dq
Field: 2 P&j (,7
Field: 3 'xhcuVl
Field: 4
c 1$ngH0
ERROR - For field 4, wavelength 1, rays at the edge of the pupil S-7'it!1
may be ignored. Check apertures and vignetting for consistency. K TsgJ\W
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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