| 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。 W4S! rU
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： E9v_6d[
Warning: At least 3 focal positions are recommended for finding best focus 7\ kixfEg
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. s92SN F}g
Any MTF results are of questionable value for assessing 629 #t`W\
the image quality, except in those cases where the user is ])$Rw $`w
interested only in the image of a point-like object. The Cc>+OUL
image quality for the unacceptable fields varies significan- ^n<o,K4 \}
tly over a lateral region of 12 Airy disk diameters. ~Jx0#+z9V
Warning: The MTF results at one or more fields are inaccurate. } ^n346^
The mapping between entrance pupil coordinates and exit pupil coordinates x10u?@
is nonlinear. The nature of the nonlinearity is such that Code V is not Ce!xa\
able to compute an accurate MTF result. Usually, this condition is M}xyW"yp
caused by severe pupil distortion or some discontinuity in the pupil ] Qh0+!SdG
coordinate mapping. In all cases where the pupil coordinate mapping z3Q#Wmv2
has sufficient nonlinearity to cause this warning, the imagery is extremely rnS&^
nonstationary (non-isoplanatic) and small changes in object space u% I |o s]
coordinates will cause large changes in the image of a point source. )CUB7D)=
Error: The problem described here occurs at the following field(s): Eh/Z4 pz T
Field: 1 s|o+
Im
Field: 2 _jD\kg#LY
Field: 3 gP:H_nVh
Field: 4 0XUWK@)P
ERROR - For field 4, wavelength 1, rays at the edge of the pupil 1_6oM/?'
may be ignored. Check apertures and vignetting for consistency. /m(v5v7(
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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