| 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。 - 4}I02
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： K% Gbl#
Warning: At least 3 focal positions are recommended for finding best focus m4@f&6x
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. &;V3[
*W"
Any MTF results are of questionable value for assessing +.p$Yi`
the image quality, except in those cases where the user is _tGR:E
interested only in the image of a point-like object. The HJ\CGYmyz
image quality for the unacceptable fields varies significan- 1f.xZgO/2
tly over a lateral region of 12 Airy disk diameters. I8 <s4q
Warning: The MTF results at one or more fields are inaccurate. ,Cj8{s&;
The mapping between entrance pupil coordinates and exit pupil coordinates wq( m%F
is nonlinear. The nature of the nonlinearity is such that Code V is not T21 SuM
able to compute an accurate MTF result. Usually, this condition is
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caused by severe pupil distortion or some discontinuity in the pupil kP6P/F|RcZ
coordinate mapping. In all cases where the pupil coordinate mapping ItoSOR VV
has sufficient nonlinearity to cause this warning, the imagery is extremely )~](qLSl
nonstationary (non-isoplanatic) and small changes in object space qwb`8o
coordinates will cause large changes in the image of a point source. oc2aE:>X
Error: The problem described here occurs at the following field(s): a oZ`C3
Field: 1 MI!JZI$z5
Field: 2 Wv
Field: 3 AlQ!Q)y<@
Field: 4 |sw&sfH[FD
ERROR - For field 4, wavelength 1, rays at the edge of the pupil !6wbg
may be ignored. Check apertures and vignetting for consistency. OGy/8B2c
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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