| 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。 * ` JYC
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： akmkyrz '&
Warning: At least 3 focal positions are recommended for finding best focus pE`})/?\*
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. CXH&U@57{
Any MTF results are of questionable value for assessing H%[e V8
the image quality, except in those cases where the user is Lc}y<=P@
interested only in the image of a point-like object. The p'Y^ X
image quality for the unacceptable fields varies significan- CT&|QH{
tly over a lateral region of 12 Airy disk diameters. V.U|
#n 5
Warning: The MTF results at one or more fields are inaccurate. S;Fi? M
The mapping between entrance pupil coordinates and exit pupil coordinates l5~os >
is nonlinear. The nature of the nonlinearity is such that Code V is not 4VHn \
able to compute an accurate MTF result. Usually, this condition is R8K& R\
caused by severe pupil distortion or some discontinuity in the pupil ~?l |
[
coordinate mapping. In all cases where the pupil coordinate mapping [|v][Hwv
has sufficient nonlinearity to cause this warning, the imagery is extremely % 7hrk
nonstationary (non-isoplanatic) and small changes in object space z[ N`s$;
coordinates will cause large changes in the image of a point source. QL(n} {.%
Error: The problem described here occurs at the following field(s): pd?M f=>#
Field: 1 HVRZ[Y<^
Field: 2 d z|or9&
Field: 3 )705V|v
Field: 4 &0d# Y]D4`
ERROR - For field 4, wavelength 1, rays at the edge of the pupil `Gs9Xmc|
may be ignored. Check apertures and vignetting for consistency. 5%"V[lDx@
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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