学习公差分析的时间不长,其实很多时候真的感到很疑惑,好像有时候在最差的十项里面未必就是最差的,好像有时候会出现比这里面其中的一些还敏感的却没有出现在最差的十项里面,最近一直不求甚解,但今天遇到一问题实在不得不让我去求甚解。事情是这样的,我对一个镜头进行分析,公差分析结果贴在下面,其中第10到11面的空气间隔就是L5-L6的间隔,按照最差的十项来说,应该是变化这个间距MTF会下降比较大,可实际上MTF却没有什么下降,而4到6面的间距(L2和L3之间的空气间隔)变化MTF下降的确比较明显,真不明白这是为什么,镜头的镜片排序大致如下面所示。还有,我请教了前辈,前辈说公差模拟是随机的,不一定正确的,只是有参考价值而已,而且他还说假如公差分析设置的操作数一样,那每次公差分析的结果也不一定相同,这让我有点疑惑,好像我印象中不是这样的,我好像这么做过,但分析的结果是一样的,当然这个我自己去试试就知道了,只是现在太晚了,不想去试一试,想睡觉了,所以对于其他问题,希望各位不吝赐教,谢谢!还有,希望各位看看我公差分析的结果,看看里面是否有设置不对的地方,有的话请指正,再次谢过。 \
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公差分析结果: @P
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Units are Millimeters. UZ3oc[#D=]
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Paraxial Focus compensation is on. In this mode, all rQ$Jk[Y
compensators are ignored, except paraxial back focus change. XCku[?Ix
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WARNING: Boundary constraints on compensators are ignored when p/%B>Y>
using fast mode or user-defined merit functions. pk:2>sx/
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Criteria : Diffraction MTF average S&T at 180.0000 lp/mm 4@ =l'Fw
Mode : Sensitivities J3#
Sampling : 3 h?2 :'Vu]
Optimization Cycles : Automatic mode T0Zv.
Nominal Criteria : 0.38686619 A]CO
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Test Wavelength : 0.5460 eWwI@ASaA
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Fields: User Defined Real Image height in Millimeters .~fAcc{Qj
# X-Field Y-Field Weight VDX VDY VCX VCY *Wmn!{\g
1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000 0G"I}Jp{
2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000 x1nqhSaD
3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000 C`>|D [
4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000 vW:XM0
5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105 Ah<6m5+
6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217 nolLeRE1
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Sensitivity Analysis: f;PvXq<7"
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|------------ Minimum ------------| |------------ Maximum ------------| }^Kye23
Type Value Criteria Change Value Criteria Change 6Jf\}^4@k
TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670 h(VF
TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867 FD*w4U5
TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386 "vnWq=E2
TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987 }n91aE3v
TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158 @(_M\>!%M
TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
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Worst offenders: A(>kp=~
Type Value Criteria Change (`pd>
TTHI 10 11 -0.010000 0.375901 -0.010965 ;'x\L<b/)
TTHI 4 6 0.010000 0.378999 -0.007867 C/L+:b&x~
TTHI 2 3 0.010000 0.380196 -0.006670 dJ0qg_ U&
TTHI 7 8 -0.010000 0.380585 -0.006282 Yh}F
TTHI 4 6 -0.010000 0.380717 -0.006149 Z>#MTxU(
TTHI 10 11 0.010000 0.385879 -0.000987 |2eF~tJqc
TTHI 2 3 -0.010000 0.386393 -0.000473 ssy+x;<x,
TTHI 7 8 0.010000 0.386480 -0.000386 JZ
TTHI 12 13 0.010000 0.386709 -0.000158 L?c7M}vV
TTHI 14 15 0.010000 0.386722 -0.000144 &J~%Nt
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Estimated Performance Changes based upon Root-Sum-Square method: ird
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Nominal MTF : 0.3869 :6Q`! in
Estimated change : -0.0124 ADa'(#+6
Estimated MTF : 0.3745 O]Mz1 ev|
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Compensator Statistics: 8v)PDO~D}A
Change in back focus: cNd2XQB9=
Minimum : -0.008974 oqOXRUy
Maximum : 0.008997 3g#fX{e_5!
Mean : 0.000002 75pz' Cb
Standard Deviation : 0.004372 S2jO
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Monte Carlo Analysis: {,|J?>{
Number of trials: 20 +AT!IZrB2i
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Initial Statistics: Normal Distribution '5mzlR
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Trial Criteria Change I=,u7w`m
1 0.381931 -0.004936 fJ?$Z|
2 0.386597 -0.000269 @YEdN}es
3 0.380763 -0.006103 Z-!W#
4 0.385898 -0.000968 79>8tOuo
5 0.379542 -0.007324 *WQ}ucE^#
6 0.386121 -0.000745 IJ%S[>
7 0.388123 0.001257 dD2N!umW
8 0.385172 -0.001695 z5CWgN
9 0.386426 -0.000440 # Z*nc0C
10 0.387614 0.000748 a%-P^M;a2
11 0.375242 -0.011624 ( /cW
12 0.386008 -0.000859 o'3t(dyyH
13 0.388606 0.001740 'ErtiD
14 0.383519 -0.003347 =~&Fq$$
15 0.381154 -0.005712 K%: :
16 0.382717 -0.004149 "Iy @PR?>
17 0.388328 0.001462 %EuXL% B
18 0.386187 -0.000679 ?^F#}>C
19 0.385583 -0.001283 ~lR"3z_Z}
20 0.383495 -0.003371 uW&P1'X
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Nominal 0.386866 ~67L
Best 0.388606 KB,!s7A
Worst 0.375242 f.gkGwNk
Mean 0.384451 `j59MSuK
Std Dev 0.003324 t-\S/N
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Compensator Statistics: -IR9^)
Change in back focus: )>)_>[
Minimum : -0.011827 Ml)Xq-&wc
Maximum : 0.006609 saH +C@_,
Mean : 0.000099 I3xx}^V
Standard Deviation : 0.004182 4QnJ;&~
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90% >= 0.379542 jZ <*XX
50% >= 0.385583 {PHxm
10% >= 0.388123 ;bd\XHwMUP
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End of Run