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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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*<67h*|) =M*pym]QSY L3前面两竖线是
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@w: N*&T)a 公差分析结果:
D QxuV1 P/1YN Units are Millimeters.
xxl|j$m h6O'" Paraxial Focus compensation is on. In this mode, all
p o)lN[v compensators are ignored, except paraxial back focus change.
'fb\t, T!y 9v5 WARNING: Boundary constraints on compensators are ignored when
fi*b]a\' using fast mode or user-defined merit functions.
2P8wvNDG kw2yb Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
$<2d|;7r Mode : Sensitivities
g&F$hm Sampling : 3
a$Ud" Optimization Cycles : Automatic mode
C^4,L
\E Nominal Criteria : 0.38686619
&}P#<"Fo8Q Test Wavelength : 0.5460
2/V%jS[4#y ?G',Qtz<K Fields: User Defined Real Image height in Millimeters
d;gs1]E50 # X-Field Y-Field Weight VDX VDY VCX VCY
x X3I` 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
DMch88W 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
z{w %pUn} 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
2[pOGc$ 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
8+gp"!E 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
I9+h-t 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
u4xtlGt5 >}~[ew Sensitivity Analysis:
wH@S$WT Fs4shrt |------------ Minimum ------------| |------------ Maximum ------------|
M_%KhK Type Value Criteria Change Value Criteria Change
d@{12hq TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
l\V1c90m TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
{p/Yz# TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
9%NsW3| TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
0vSPeZ
TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
)b]wpEFl TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
;-py h( 0<@['W}G Worst offenders:
qQDe'f~ Type Value Criteria Change
t(roj@!x_o TTHI 10 11 -0.010000 0.375901 -0.010965
)=K8mt0qob TTHI 4 6 0.010000 0.378999 -0.007867
1DAU*^- TTHI 2 3 0.010000 0.380196 -0.006670
ETU-6qFtO TTHI 7 8 -0.010000 0.380585 -0.006282
A. tGr(r TTHI 4 6 -0.010000 0.380717 -0.006149
c\rP
-"C TTHI 10 11 0.010000 0.385879 -0.000987
?K2EK'-q TTHI 2 3 -0.010000 0.386393 -0.000473
,ps?@lD TTHI 7 8 0.010000 0.386480 -0.000386
ySiZ@i4 TTHI 12 13 0.010000 0.386709 -0.000158
r`Fs"n#^-4 TTHI 14 15 0.010000 0.386722 -0.000144
oVHe<zE.
ZLKbF9lo IZ>l Estimated Performance Changes based upon Root-Sum-Square method:
VV$#<D<) Nominal MTF : 0.3869
ue7D'
UZL> Estimated change : -0.0124
hV,T889'
Estimated MTF : 0.3745
"DvZCf[} u5rvrn ] Compensator Statistics:
%`5K8eB Change in back focus:
G?,3Zn0 Minimum : -0.008974
tF/Ni*\^rV Maximum : 0.008997
&P}t<; Mean : 0.000002
<aaT,J8%[ Standard Deviation : 0.004372
hVB(*WA^D _qf~
hhi U%@C<o
" Monte Carlo Analysis:
LD?\gK" Number of trials: 20
-UidU+ES; d]|K%<+( Initial Statistics: Normal Distribution
[75?cQD hTEb?1CXU Trial Criteria Change
&Lzd*}7 1 0.381931 -0.004936
t`hes
$E 2 0.386597 -0.000269
N\tFK*U^I 3 0.380763 -0.006103
,jz~Np_2 4 0.385898 -0.000968
.7Yox1, 5 0.379542 -0.007324
1I'Q{X&B 6 0.386121 -0.000745
@?]>4+Oa0 7 0.388123 0.001257
.6rbn8h 8 0.385172 -0.001695
*mj=kJ7(
9 0.386426 -0.000440
-"'+#9{h 10 0.387614 0.000748
Zi]E!Tgn 11 0.375242 -0.011624
5cA:;{z];g 12 0.386008 -0.000859
K5`*Y@ 13 0.388606 0.001740
G~&8/ s 14 0.383519 -0.003347
)n9,?F#l 15 0.381154 -0.005712
a"O;DYh 16 0.382717 -0.004149
;q%z\gA 17 0.388328 0.001462
havmhS)O 18 0.386187 -0.000679
B<.\^fuS 19 0.385583 -0.001283
{)b 20 0.383495 -0.003371
mc2uI-W E+<GsN] Nominal 0.386866
xuqG)HthRS Best 0.388606
+C7W2!I[G2 Worst 0.375242
lq3D!+m Mean 0.384451
7p!f+\kM Std Dev 0.003324
CflyK@ (4q/LuP^d Compensator Statistics:
`mD!z.`U Change in back focus:
8"d??3ZXJ Minimum : -0.011827
se>\5k Maximum : 0.006609
U8>4Cl J4 Mean : 0.000099
Hq>hnCT Standard Deviation : 0.004182
]FvGAG.* 6Xo "?f 90% >= 0.379542
3
.j/D^ 50% >= 0.385583
6; )5v 10% >= 0.388123
gWj r|m< tD#) End of Run