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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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光阑 Xi$2MyRd Qt`}$] 公差分析结果:
&c%;Lo v,^2'C$o Units are Millimeters.
[7oU = yP.,Dh s Paraxial Focus compensation is on. In this mode, all
,ir(~g+{g compensators are ignored, except paraxial back focus change.
F$X"?fj 1%g%I8W% WARNING: Boundary constraints on compensators are ignored when
K 0R<a~ using fast mode or user-defined merit functions.
hX;JMQ915 6B'd]Fe Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
9l<f?OzAO Mode : Sensitivities
ZjLu qo Sampling : 3
bLuAe
EA Optimization Cycles : Automatic mode
zT4SI'r?f Nominal Criteria : 0.38686619
3@7IY4>o Test Wavelength : 0.5460
j\@Ht~G xY v@ Fields: User Defined Real Image height in Millimeters
cgY+xd@ # X-Field Y-Field Weight VDX VDY VCX VCY
O!xul$9 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
;hzm&My 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
h'%iY6!fA 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
Mwm9{1{ 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
\\}tD@V" 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
;d5d$Np@m& 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
:Aq==N_/2 |T3F:],` Sensitivity Analysis:
{{N*/E^ ,X^I]] |------------ Minimum ------------| |------------ Maximum ------------|
Qx<86aKkF Type Value Criteria Change Value Criteria Change
`,~8(rIM TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
x`9IQQ TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
H+lBb$ TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
rW),xfo0 TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
1!/WC.0 TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
: ZehBu TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
N#C,q&; .A%*AlX Worst offenders:
P~xP@?I% Type Value Criteria Change
Ct@O S227x TTHI 10 11 -0.010000 0.375901 -0.010965
ebv"`0K$ TTHI 4 6 0.010000 0.378999 -0.007867
'fo.1 TTHI 2 3 0.010000 0.380196 -0.006670
%OT} r TTHI 7 8 -0.010000 0.380585 -0.006282
u]`ur#_ TTHI 4 6 -0.010000 0.380717 -0.006149
4Kl{^2 TTHI 10 11 0.010000 0.385879 -0.000987
}:SWgPfc TTHI 2 3 -0.010000 0.386393 -0.000473
';,Rq9-' TTHI 7 8 0.010000 0.386480 -0.000386
W[BwHNxyg TTHI 12 13 0.010000 0.386709 -0.000158
Z2@_F7cXt TTHI 14 15 0.010000 0.386722 -0.000144
0*y|k1 0[L)`7 9S<g2v Estimated Performance Changes based upon Root-Sum-Square method:
LeEv'] Nominal MTF : 0.3869
MeCHn2zwB Estimated change : -0.0124
fC|NK+Xd` Estimated MTF : 0.3745
u"hv
_ml SobOUly5{ Compensator Statistics:
"1I\~]] Change in back focus:
"fH"U1Bw Minimum : -0.008974
HdR%n Maximum : 0.008997
jt5:rWB Mean : 0.000002
25R6>CXsi Standard Deviation : 0.004372
K (px-jY 6v1F.u @a~GHG[x Monte Carlo Analysis:
P[q 'Y^\ Number of trials: 20
))9w)A@ _ -6IB> Initial Statistics: Normal Distribution
^E]Xq]vd" ;:Kd?Tz$ Trial Criteria Change
SN<Dxa8Iy 1 0.381931 -0.004936
-mfd ngp3 2 0.386597 -0.000269
Z) qts= 3 0.380763 -0.006103
G_1`NyI 4 0.385898 -0.000968
z\g6E/ %% 5 0.379542 -0.007324
}}s.0Q 6 0.386121 -0.000745
+ $Yld{i 7 0.388123 0.001257
P&kjtl68Y 8 0.385172 -0.001695
N0mP
EF2 9 0.386426 -0.000440
wbImE;-Z 10 0.387614 0.000748
?yNg5z 11 0.375242 -0.011624
$C.;GU EQ 12 0.386008 -0.000859
qvH RP@ 13 0.388606 0.001740
'.$va< 14 0.383519 -0.003347
T*3>LY+bb 15 0.381154 -0.005712
n-)Xs;`2 16 0.382717 -0.004149
\""sf{S9 17 0.388328 0.001462
]ucz8(' 18 0.386187 -0.000679
d&G#3}kOb% 19 0.385583 -0.001283
kZU
v/]Y. 20 0.383495 -0.003371
P/?'ea Z]^Ooy[pb Nominal 0.386866
]/cVlpZ{f Best 0.388606
7SVqfWp Worst 0.375242
{vf4l4J( Mean 0.384451
azKiXr#_( Std Dev 0.003324
a}p}G\b| aePLP Compensator Statistics:
S`t@L} Change in back focus:
|%HTBF Minimum : -0.011827
_*1{fvv0{ Maximum : 0.006609
)}|b6{{< Mean : 0.000099
r@)_>( Standard Deviation : 0.004182
V/,@hv`+ +r<d z 90% >= 0.379542
OA?pBA 50% >= 0.385583
+$SJ@IH[< 10% >= 0.388123
D *Hy 2eZ. _X/`7!f End of Run