| 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。 C`J> Gm
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： D]?eRO9'
Warning: At least 3 focal positions are recommended for finding best focus *?JNh;
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 1BjMVMH
Any MTF results are of questionable value for assessing P&>!B,f
the image quality, except in those cases where the user is <:n !qQS6
interested only in the image of a point-like object. The `{Jo>L .
image quality for the unacceptable fields varies significan- $fzO:br5WJ
tly over a lateral region of 12 Airy disk diameters. 5[[m S
Warning: The MTF results at one or more fields are inaccurate. \&6^c= 2=
The mapping between entrance pupil coordinates and exit pupil coordinates PeX^aEc
is nonlinear. The nature of the nonlinearity is such that Code V is not =O1py_m
able to compute an accurate MTF result. Usually, this condition is d3[O!4<T
caused by severe pupil distortion or some discontinuity in the pupil #VvU8"u
coordinate mapping. In all cases where the pupil coordinate mapping Q)IL]S
has sufficient nonlinearity to cause this warning, the imagery is extremely '^{:HR#i
nonstationary (non-isoplanatic) and small changes in object space 9hTzi+'S
coordinates will cause large changes in the image of a point source. <hV%OrBz-
Error: The problem described here occurs at the following field(s): @^2?97i
c
Field: 1 FwjmC%iY
Field: 2 baO'FyCs9&
Field: 3 NimW=X;c
Field: 4 V JJ6q
ERROR - For field 4, wavelength 1, rays at the edge of the pupil ^H(,^cVN
may be ignored. Check apertures and vignetting for consistency. F"ua`ercI
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
|
|