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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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`oH=O6 ~ldqg2c L3前面两竖线是
光阑 gE8p**LT+ sp*_;h3' 公差分析结果:
7N0V`&}T 3D>syf Units are Millimeters.
3 "fBp iW\cLp " Paraxial Focus compensation is on. In this mode, all
& xOEp compensators are ignored, except paraxial back focus change.
Kc~h KO/Z|I WARNING: Boundary constraints on compensators are ignored when
{p&M(W] using fast mode or user-defined merit functions.
Yg@k+ =jZ}@L/+ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
Ia-`x/r*m Mode : Sensitivities
m3zmyw} Sampling : 3
)=6|G^ Optimization Cycles : Automatic mode
|f+|OZY Nominal Criteria : 0.38686619
*|S.[i_7 Test Wavelength : 0.5460
h6c0BmS{1 YI!ecx%/4 Fields: User Defined Real Image height in Millimeters
A?I/[zkc # X-Field Y-Field Weight VDX VDY VCX VCY
hd*bPj; 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
RL0,QC)e#@ 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
R B7?T5G 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
ht _fbh(l 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
QTX5F5w 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
>R"]{y 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
_kR);\V.8 JD1IL` ta; Sensitivity Analysis:
;w,+x 7 ,{=pFs2 |------------ Minimum ------------| |------------ Maximum ------------|
B;f\H,/59 Type Value Criteria Change Value Criteria Change
P9(]9np,, TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
e@[9WnxYe TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
+RLHe]9& TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
YU! SdT$ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
8!87p?Mz TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
xW92ZuzSH TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
3(D!]ku~m &K
Ti[ Worst offenders:
z3RD*3b Type Value Criteria Change
{.=4; TTHI 10 11 -0.010000 0.375901 -0.010965
O3,IR1 TTHI 4 6 0.010000 0.378999 -0.007867
-90qG"@ TTHI 2 3 0.010000 0.380196 -0.006670
t#
cm| TTHI 7 8 -0.010000 0.380585 -0.006282
Hrb67a%b TTHI 4 6 -0.010000 0.380717 -0.006149
Ubtu?wRBW TTHI 10 11 0.010000 0.385879 -0.000987
D*!p8J8Ku TTHI 2 3 -0.010000 0.386393 -0.000473
YCJc Dab TTHI 7 8 0.010000 0.386480 -0.000386
x;d*?69f] TTHI 12 13 0.010000 0.386709 -0.000158
SymBb}5 TTHI 14 15 0.010000 0.386722 -0.000144
p'PHBb8I 0< i]ph $#q:\yQsPC Estimated Performance Changes based upon Root-Sum-Square method:
,S.<qmf Nominal MTF : 0.3869
@lvvI<U Estimated change : -0.0124
$Pw@EC] Estimated MTF : 0.3745
]PlDe8 1+`Bli]dE Compensator Statistics:
<\i}zoPO Change in back focus:
-"m4 A0 Minimum : -0.008974
Vgzw ['L} Maximum : 0.008997
J=QuZwt Mean : 0.000002
r3.A!*! Standard Deviation : 0.004372
xw2dEvjgp% 9='a9\((mH ~loJYq'y Monte Carlo Analysis:
~fL:pVp Number of trials: 20
cWG>w6FI e) Q{yO Initial Statistics: Normal Distribution
/W4F(3oM pv/LTv Trial Criteria Change
px `o.%`' 1 0.381931 -0.004936
(N63k1M 2 0.386597 -0.000269
]`[r=cG 3 0.380763 -0.006103
$:|z{p 4 0.385898 -0.000968
C?IvXPlV 5 0.379542 -0.007324
?9jl8r> 6 0.386121 -0.000745
g.3 .
C? 7 0.388123 0.001257
BK,h$z7#6 8 0.385172 -0.001695
O0|**Km\+ 9 0.386426 -0.000440
-p|JJx?r 10 0.387614 0.000748
H)#HK!F6f 11 0.375242 -0.011624
%Pl
7FHfB 12 0.386008 -0.000859
W*D]?hXU; 13 0.388606 0.001740
P(H,_7 4 14 0.383519 -0.003347
pVuJ4+` 15 0.381154 -0.005712
\2$-.npz 16 0.382717 -0.004149
E:EXp7 17 0.388328 0.001462
Z^P]-CB|6A 18 0.386187 -0.000679
",U>;` 19 0.385583 -0.001283
iF.eBL% 20 0.383495 -0.003371
zGm#erE sY @S
Nominal 0.386866
(``EBEn Best 0.388606
?fO
2&)r
Worst 0.375242
)e,Rp\fY$ Mean 0.384451
z^tws*u],5 Std Dev 0.003324
qs$%/ hqEnD Compensator Statistics:
l)JNNcej Change in back focus:
)(&Z&2~A Minimum : -0.011827
/jBjqE;_ Maximum : 0.006609
#Y)Gos Mean : 0.000099
ym>>5 (bni Standard Deviation : 0.004182
fpj,~+ DA>_9o/l 90% >= 0.379542
~g&FeMo 50% >= 0.385583
@fDWp/ 10% >= 0.388123
[&IJy d E0
`tX End of Run