| 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。 # 3.\j"b
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： Hg aZbb>'
Warning: At least 3 focal positions are recommended for finding best focus KXq_K:r ?
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. l0:5q?g
Any MTF results are of questionable value for assessing &>g~-s
the image quality, except in those cases where the user is 'bC]M3P
interested only in the image of a point-like object. The s%^o*LQ|9
image quality for the unacceptable fields varies significan- ^EuW(
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tly over a lateral region of 12 Airy disk diameters. 2uEhOi0I
Warning: The MTF results at one or more fields are inaccurate. gJK KR]4*
The mapping between entrance pupil coordinates and exit pupil coordinates \q,s?`+B
is nonlinear. The nature of the nonlinearity is such that Code V is not 4~D ax)
able to compute an accurate MTF result. Usually, this condition is -,|ha>r
caused by severe pupil distortion or some discontinuity in the pupil $
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L;j
coordinate mapping. In all cases where the pupil coordinate mapping OT;cfkf7
has sufficient nonlinearity to cause this warning, the imagery is extremely ^4 8\>-Q\
nonstationary (non-isoplanatic) and small changes in object space D Fc [z"[
coordinates will cause large changes in the image of a point source. NHAH#7]M&1
Error: The problem described here occurs at the following field(s): ,z[(k"
Field: 1 GkciA{
Field: 2 eG4>d^`c
Field: 3 Dp`HeSKU^
Field: 4 SY|Ez!tU:N
ERROR - For field 4, wavelength 1, rays at the edge of the pupil K#wK1 Sv
may be ignored. Check apertures and vignetting for consistency. @701S(0 '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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