| 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。 S'h{["P~
0
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： 8wi2&j _
Warning: At least 3 focal positions are recommended for finding best focus hxB`
hu-
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. j(QK 0 "z
Any MTF results are of questionable value for assessing 0b)q,]l]
the image quality, except in those cases where the user is xJ);P.
interested only in the image of a point-like object. The `y^tCJ2u*
image quality for the unacceptable fields varies significan- ~S85+OJ;M
tly over a lateral region of 12 Airy disk diameters. <o aVI?
Warning: The MTF results at one or more fields are inaccurate. ^$D2fS
The mapping between entrance pupil coordinates and exit pupil coordinates (lz Z=T
is nonlinear. The nature of the nonlinearity is such that Code V is not J)o =0i>*
able to compute an accurate MTF result. Usually, this condition is !4/s|b9K
caused by severe pupil distortion or some discontinuity in the pupil zra zbHI
coordinate mapping. In all cases where the pupil coordinate mapping ru#CywK{{;
has sufficient nonlinearity to cause this warning, the imagery is extremely ndXUR4
nonstationary (non-isoplanatic) and small changes in object space ,S%DHT
coordinates will cause large changes in the image of a point source. E dp%z"J;C
Error: The problem described here occurs at the following field(s): 3d>3f3D8;
Field: 1 U WU PY
Field: 2 |Ok=aV7
Field: 3 !&f>,?wlP
Field: 4 O-N@HZC
ERROR - For field 4, wavelength 1, rays at the edge of the pupil &^I2N pT
may be ignored. Check apertures and vignetting for consistency. `{B<|W$=
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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