有高人计算过公差分析里的相关数值吗

比如我们在选择评价标准（Criterion）时，可以选择RMS Spot Radius 或者 GEO or Diff MTF Average 等等等等

那么分析结果中的名义评价标准数值是如何计算的呢，比如这是一段我的分析结果：

Criterion           : Geometric MTF average S&T at 20.0000 cycles per mm /IO<TF(X
Mode                : Sensitivities ftr8~*]O
Sampling            : 2 CAbeb+O
Nominal Criterion   : 0.59868582 u8w4e!rKo6
Test Wavelength     : 0.6328

其中提到了 Normial Criterion 也就是说名义的标准，即几何平均传函在 20线对时的标准为 0.5986582

那么这个数值是如何计算的呢？average是代表了平均吗？

我打开了Geo MTF的曲线图，从text中得到了20线对下各个市场的子午和弧失传函数值，比如我共有6个视场，那就是12个传函数值，把各个值加起来再除以12，结果为0.6209129 还是有些区别。所以我就很好奇这个数值怎么算的，

另外比如 RMS Spot radius的计算，是计算Geo spot radius 的RMS？还是计算RMS Radiu Size 的RMS？这些我在Manual里都没有找到，还望高人指点。

redbuds	2012-03-13 15:34
先对每个视场T和S的MTF计算平均值, 再对这些平均值加权平均. 注意每个视场是有权重因子的. 另外就是采样的密度要一致.

sansummer	2012-03-13 17:23
redbuds:先对每个视场T和S的MTF计算平均值, 再对这些平均值加权平均. 注意每个视场是有权重因子的. 另外就是采样的密度要一致. (2012-03-13 15:34) OsGKlWM/ W]-c`32~S 十分感谢 '",+2=JJ (QFu``ae+ 我的确设置了视场权重，刚才算了一下还是有点偏差，我再试试。 <y!(X"n` 2," ( 十分感谢您提示思路，等算好了再联系您

redbuds

2012-03-17 01:25

还有一点忘了说了, 就是公差计算时的视场设定? 是Y对称? XY对称? 用户自定义? 我的解释只是针对用户自定义时的结果.
具体的内容请见下面:

Fields: Generally speaking, the field definitions used for optimization and analysis are inadequate for
tolerancing. for example, a rotationally symmetric lens may use field definitions of 0, 7, and 10 degrees. For
tolerancing purposes, the lack of symmetry in the field definitions may cause inaccurate results when analyzing
tilt or decenter tolerances. When constructing a merit function to use for tolerancing ZEMAX can use three
different field settings:
Y-Symmetric: ZEMAX computes the maximum field coordinate, then defines new field points at +1.0, +0.7,
0.0, -0.7, and -1.0 times the maximum field coordinate, in the Y direction only. All X field values are set to
zero. This is the default for rotationally symmetric lenses.
XY-Symmetric: Similar to Y-Symmetric, except there are 9 field points used. The 5 Y-Symmetric points are
used, and -1.0, -0.7, +0.7, and +1.0 are added in the X axis direction only.
User Defined: Use whatever field definitions exist in the current lens file. This option is required when using
vignetting factors, tolerancing multiple configuration lenses, or using tolerance scripts. It is also highly
recommended when tolerancing non rotationally symmetric lenses or lenses with complex field weighting
that user defined fields be used.

nanuto	2012-07-07 10:43
我顶！！

wmh1985	2012-08-06 22:03
能不能详细点啊！还是稀里糊涂啊！

hoy0000	2012-10-09 20:10
解释的很好的东西

以爱之名	2012-10-26 23:56
只要努力每个人都能成为高手

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