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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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"&2D6 JL(*peeu3 L3前面两竖线是
光阑 ::M/s#-@ &`@Jy|N\ 公差分析结果:
n*O/X 2%@j<yS Units are Millimeters.
<MfB;M >ueJ+sgH Paraxial Focus compensation is on. In this mode, all
^ePSI|EW compensators are ignored, except paraxial back focus change.
m,.d< ** k|
jCc WARNING: Boundary constraints on compensators are ignored when
2"i<--Y using fast mode or user-defined merit functions.
W)9KYI9u !w/~dy Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
?Z14l0iZ%d Mode : Sensitivities
L g%cVSz/C Sampling : 3
$[|8bE Optimization Cycles : Automatic mode
B2,!
0Re Nominal Criteria : 0.38686619
8KAyif@1:: Test Wavelength : 0.5460
Z-vzq; -)$)<k Fields: User Defined Real Image height in Millimeters
-}N{'S,Bp # X-Field Y-Field Weight VDX VDY VCX VCY
_5X}&>>lhF 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
}7C{:H2d 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
z2dM*NMK 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
T+~~w'v0 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
J#X 7Ss 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
>c1mwZS; 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
n"MFC F]ALZxwkz Sensitivity Analysis:
5w1=j\oq "1[N;|xa |------------ Minimum ------------| |------------ Maximum ------------|
~ R* 6w($ Type Value Criteria Change Value Criteria Change
Y@r#:BH) TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
TVjY8L9'h TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
<"\K|2Sg TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
`i.f4]r TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
fIBLJ53 TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
wZOO#&X#r TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
:#gz)r 4 5Ql7~ Worst offenders:
KlrKGmy,) Type Value Criteria Change
Mv9s TTHI 10 11 -0.010000 0.375901 -0.010965
h{h=',o1 TTHI 4 6 0.010000 0.378999 -0.007867
r^
"mPgY TTHI 2 3 0.010000 0.380196 -0.006670
WUHx0I TTHI 7 8 -0.010000 0.380585 -0.006282
.KB*u*h TTHI 4 6 -0.010000 0.380717 -0.006149
YqDw*S{ TTHI 10 11 0.010000 0.385879 -0.000987
3s|tS2^4 TTHI 2 3 -0.010000 0.386393 -0.000473
f5yd2wKy6 TTHI 7 8 0.010000 0.386480 -0.000386
7C 4Njei" TTHI 12 13 0.010000 0.386709 -0.000158
o+ tY[UX TTHI 14 15 0.010000 0.386722 -0.000144
vfo[<" `b]
NB^/ NuP@eeF>, Estimated Performance Changes based upon Root-Sum-Square method:
2R5]UR S Nominal MTF : 0.3869
9:kb0oBa?l Estimated change : -0.0124
>PYe" Estimated MTF : 0.3745
!~mN"+u& %V+,# Compensator Statistics:
K]7@%cS Change in back focus:
pa\]@;P1 Minimum : -0.008974
^|x{E20 Maximum : 0.008997
SS`\,%aog Mean : 0.000002
MP3E]T~: Standard Deviation : 0.004372
ec3('}X v\HGL56T Y] n^(V Monte Carlo Analysis:
BShZ)t Number of trials: 20
=djzE`)0 @.g4?c Initial Statistics: Normal Distribution
`QkzWy~V3 UGN. ]#"# Trial Criteria Change
OE[/sv 1 0.381931 -0.004936
}U(^ QB 2 0.386597 -0.000269
Ny~;"n 3 0.380763 -0.006103
\u)(+t{ 4 0.385898 -0.000968
i
9b^\&& 5 0.379542 -0.007324
,{oANqP 6 0.386121 -0.000745
hm5<_(F! 7 0.388123 0.001257
u_[Zu8 8 0.385172 -0.001695
Tru`1/ 7I 9 0.386426 -0.000440
bk7miRIB 10 0.387614 0.000748
J[B8sa 11 0.375242 -0.011624
bX9}G#+U 12 0.386008 -0.000859
\fKv+ 13 0.388606 0.001740
*|jqRfa" 14 0.383519 -0.003347
RM`8P5i]sF 15 0.381154 -0.005712
dE^'URBiA 16 0.382717 -0.004149
Qv?jo(] 17 0.388328 0.001462
%|u"0/ 18 0.386187 -0.000679
Xr~r`bR= 19 0.385583 -0.001283
OC[a?#R1 20 0.383495 -0.003371
te:VYP a{8GT2h`4 Nominal 0.386866
mDq01fU4 Best 0.388606
'}OrFN Worst 0.375242
Uvuvr_IP Mean 0.384451
~k J#IA Std Dev 0.003324
: i(h[0 LCdc7 Compensator Statistics:
wY=ky629 Change in back focus:
I{2e0 Minimum : -0.011827
ud.S,
8Sy Maximum : 0.006609
%"z W] Mean : 0.000099
ypsCyDQK` Standard Deviation : 0.004182
QvqBT }tJ:-!*2 90% >= 0.379542
EU\1EBT^ 50% >= 0.385583
IGp-`%9 10% >= 0.388123
Zc"]Cv( 0? l End of Run