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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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W#{la`#Bu 2+:'0Krc L3前面两竖线是
光阑 ertBuU Kt6>L5:94 公差分析结果:
u-szt ? O| j5^-.sEEw Units are Millimeters.
Ri @`a ^A!$i$NON Paraxial Focus compensation is on. In this mode, all
LuS+_|]x compensators are ignored, except paraxial back focus change.
x8\<qh*: ;LQ9#M? WARNING: Boundary constraints on compensators are ignored when
m$:&P|!'p using fast mode or user-defined merit functions.
>DP:GcTG L/i(KF{ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
eFFc 9'o Mode : Sensitivities
sS9%3i/> Sampling : 3
wf9z"B Optimization Cycles : Automatic mode
/g76Hw>H Nominal Criteria : 0.38686619
%4,?kh``D Test Wavelength : 0.5460
_a5(s2wq+ MhxDV d Fields: User Defined Real Image height in Millimeters
6(KmA-!b(O # X-Field Y-Field Weight VDX VDY VCX VCY
i_ QcC 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
}C,O 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
eW50s`bKY 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
@Y-TOCadT 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
mQr0sI,o] 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
fu]N""~ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
>qh?L#Fk X+l'bp]Ry Sensitivity Analysis:
.'d2J> ~N Fm3t'^SqF |------------ Minimum ------------| |------------ Maximum ------------|
XYfv(y Type Value Criteria Change Value Criteria Change
61@EDIYPc TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
o~1 Kp!U TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
H l<$a"K7\ TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
c\.P/~ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
M_|> kp TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
Ns=AjhLc z TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
,}J_:\j gQouOjfP Worst offenders:
; Lql_1 Type Value Criteria Change
=k{`oO~:9+ TTHI 10 11 -0.010000 0.375901 -0.010965
`.v(fC TTHI 4 6 0.010000 0.378999 -0.007867
AGq>=avv TTHI 2 3 0.010000 0.380196 -0.006670
GoE
'L TTHI 7 8 -0.010000 0.380585 -0.006282
ir[jCea, TTHI 4 6 -0.010000 0.380717 -0.006149
RU&_j*U TTHI 10 11 0.010000 0.385879 -0.000987
Jpj!rXTX* TTHI 2 3 -0.010000 0.386393 -0.000473
+sZUJ TTHI 7 8 0.010000 0.386480 -0.000386
y%cO#P@ TTHI 12 13 0.010000 0.386709 -0.000158
x0Z5zV9 TTHI 14 15 0.010000 0.386722 -0.000144
}roG( 1-VT}J( O#_b7i Estimated Performance Changes based upon Root-Sum-Square method:
JTW)*q9a Nominal MTF : 0.3869
6`\ya@ Estimated change : -0.0124
2]WE({P Estimated MTF : 0.3745
uf' 4' G>z,#Xt Compensator Statistics:
(^n*Am;zlH Change in back focus:
e3m*i}K} Minimum : -0.008974
uk7'K 0j Maximum : 0.008997
-<f;l_( Mean : 0.000002
%XTA;lrz Standard Deviation : 0.004372
e/ s(ojDW Ph,-sR #A<P6zJXR Monte Carlo Analysis:
g,kzQ}_ Number of trials: 20
)^O-X.1 %fjuG Initial Statistics: Normal Distribution
q/gB<p9 {`"#yl6" Trial Criteria Change
vqNsZ 8|` 1 0.381931 -0.004936
Y+-xvx
: 2 0.386597 -0.000269
E4[}lX} 3 0.380763 -0.006103
%NARyz 4 0.385898 -0.000968
q4k@l 5 0.379542 -0.007324
,/,9j{|"j 6 0.386121 -0.000745
mpay^.(% 7 0.388123 0.001257
9#/(N#> 8 0.385172 -0.001695
rrBAQY|. 9 0.386426 -0.000440
9NpD!A&64< 10 0.387614 0.000748
\%A%s*1 11 0.375242 -0.011624
.dmi#%W 12 0.386008 -0.000859
D'[Uc6 13 0.388606 0.001740
Ufid%T' 14 0.383519 -0.003347
NgZUnh3{ 15 0.381154 -0.005712
b1`r!B, 16 0.382717 -0.004149
2+"r~#K* 17 0.388328 0.001462
lWZuXb,G 18 0.386187 -0.000679
Y)I8eU{Wl( 19 0.385583 -0.001283
cO#oH2} 20 0.383495 -0.003371
^U q (lH,JX`$a Nominal 0.386866
%$ceJ`%1e Best 0.388606
8cWZ"v Worst 0.375242
\h{r;#g Mean 0.384451
`,>wC+} Std Dev 0.003324
7C,T&g
1: v."Dnl Compensator Statistics:
>'=MH2; Change in back focus:
9'~-U Minimum : -0.011827
<vc`^Q&4B Maximum : 0.006609
!u;>Wyd W Mean : 0.000099
kCP$I732 Standard Deviation : 0.004182
W{"XJt_ bE\,}DTy 90% >= 0.379542
b"j|Bb 50% >= 0.385583
7"v$- W y 10% >= 0.388123
u5E]t9~Pq S"2qJ!.u End of Run