| 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。 jAue+ tB
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： YcclO
Warning: At least 3 focal positions are recommended for finding best focus ov H'_'
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. /]j{P4
Any MTF results are of questionable value for assessing Hm !"%
the image quality, except in those cases where the user is s3nt2$=:t
interested only in the image of a point-like object. The }7b{ZbDI
image quality for the unacceptable fields varies significan- DTM(SN8R+n
tly over a lateral region of 12 Airy disk diameters. 5@
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Warning: The MTF results at one or more fields are inaccurate. ebNRZJ?C,
The mapping between entrance pupil coordinates and exit pupil coordinates Tp{ jR<
is nonlinear. The nature of the nonlinearity is such that Code V is not o#1Ta7Ro
able to compute an accurate MTF result. Usually, this condition is y6-P6T
caused by severe pupil distortion or some discontinuity in the pupil *i#N50k*j'
coordinate mapping. In all cases where the pupil coordinate mapping Mp!1x x
has sufficient nonlinearity to cause this warning, the imagery is extremely rw3t U0j
nonstationary (non-isoplanatic) and small changes in object space EW vhT]<0
coordinates will cause large changes in the image of a point source. #a~BigZ[G
Error: The problem described here occurs at the following field(s): [ OUV!o
Field: 1 +/eJ#Xw3u8
Field: 2 pY3/AO=
Field: 3 +;,J0,Yn
Field: 4 eq8faC5
ERROR - For field 4, wavelength 1, rays at the edge of the pupil kdlmj[=
may be ignored. Check apertures and vignetting for consistency. );}M"W8
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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