| 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。 /hm84La
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： A# v|@sul
Warning: At least 3 focal positions are recommended for finding best focus QuSV&>T\
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 9U#\nXM
Any MTF results are of questionable value for assessing Q=d.y&4%
the image quality, except in those cases where the user is X}zX`]:I'
interested only in the image of a point-like object. The nGq]$h
image quality for the unacceptable fields varies significan- ! 9d _Gf-
tly over a lateral region of 12 Airy disk diameters. ~gu=x&{
Warning: The MTF results at one or more fields are inaccurate. y=[gQJ6~r
The mapping between entrance pupil coordinates and exit pupil coordinates J+{ Ou rWt
is nonlinear. The nature of the nonlinearity is such that Code V is not ]YCPyc:
able to compute an accurate MTF result. Usually, this condition is `%$8cZ-kr
caused by severe pupil distortion or some discontinuity in the pupil 1i4W WK7k
coordinate mapping. In all cases where the pupil coordinate mapping *-?Wc z
has sufficient nonlinearity to cause this warning, the imagery is extremely Of-C
nonstationary (non-isoplanatic) and small changes in object space 7)B&(2D&
coordinates will cause large changes in the image of a point source. |w=Ec#)t4
Error: The problem described here occurs at the following field(s): 9 wAA.
-"
Field: 1 j_!bT!8
Field: 2 1)$%Jr
Field: 3 TNh=4xQ}
Field: 4 x| .v{tQa
ERROR - For field 4, wavelength 1, rays at the edge of the pupil Ba/RO36&c
may be ignored. Check apertures and vignetting for consistency. 9GO}&7
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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