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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。
AmYqrmJ 5WJof`M AA$+ayzx9{ anLSD/'4W L3前面两竖线是
光阑 i2$7nSQ9 Si=zxy T 公差分析结果:
s*%pNE U .3Ex=aQcX Units are Millimeters.
f Cg"tckE +M@p)pyu Paraxial Focus compensation is on. In this mode, all
xZ2^lsY compensators are ignored, except paraxial back focus change.
,au-g)IFZ
?X{ul
WARNING: Boundary constraints on compensators are ignored when
&oi*]:<FNe using fast mode or user-defined merit functions.
:)7{$OR& ~J #^L* Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
7-Bttv{ Mode : Sensitivities
dC&{zNG Sampling : 3
E(t:F^z&D Optimization Cycles : Automatic mode
.FV
wZ:d Nominal Criteria : 0.38686619
S#gIfb<D Test Wavelength : 0.5460
`*?8<Vm \~j6}4XS1. Fields: User Defined Real Image height in Millimeters
Wk3R6
V # X-Field Y-Field Weight VDX VDY VCX VCY
"^?|=sQ 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
!{On_>`, 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
@|A
wT 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
/m#!<t7 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
.4I"[$?Q 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
s
Yp?V\Y" 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
kl4u]MyL# snU
$Na3 Sensitivity Analysis:
2Mqac:L NR98I7 |------------ Minimum ------------| |------------ Maximum ------------|
UC@&! kM Type Value Criteria Change Value Criteria Change
TF0DQP TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
"XvM1G&s` TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
sqKLz TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
G3 h&nH,> TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
e[5=?p@| TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
;4E(n TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
AfQ?jKk&{' $inpiO|s Worst offenders:
>LqW;/&S< Type Value Criteria Change
'VH%cz* TTHI 10 11 -0.010000 0.375901 -0.010965
c{X>i>l> TTHI 4 6 0.010000 0.378999 -0.007867
z
xe6M~+ TTHI 2 3 0.010000 0.380196 -0.006670
Vs/Z8t TTHI 7 8 -0.010000 0.380585 -0.006282
MSef2|"P# TTHI 4 6 -0.010000 0.380717 -0.006149
W
PDL$y TTHI 10 11 0.010000 0.385879 -0.000987
qRV5qN2{XY TTHI 2 3 -0.010000 0.386393 -0.000473
FPg5!O% TTHI 7 8 0.010000 0.386480 -0.000386
.nGYx TTHI 12 13 0.010000 0.386709 -0.000158
c UJUZ@ol TTHI 14 15 0.010000 0.386722 -0.000144
#HgXTC .W[[Z;D nMz~.^Q- Estimated Performance Changes based upon Root-Sum-Square method:
]t4 9Efw Nominal MTF : 0.3869
jGp|:!'w Estimated change : -0.0124
zYL</!6a[ Estimated MTF : 0.3745
RA5*QW
(C1@f!Z Compensator Statistics:
\1 ^qfw Change in back focus:
*F ya
qJ) Minimum : -0.008974
C`)n\?:Sth Maximum : 0.008997
P5&mpl1 Mean : 0.000002
tA,#!Z0 Standard Deviation : 0.004372
M@R_t(&= *{/L7])gm 'Dh+v3O Monte Carlo Analysis:
X?B9Z8 Number of trials: 20
Ng;K-WB\ p-KMELB Initial Statistics: Normal Distribution
ow,4'f!d QvPG
6A]T Trial Criteria Change
;,z[|"y 1 0.381931 -0.004936
)_7OHV *3 2 0.386597 -0.000269
&s]wf 3 0.380763 -0.006103
s:4<wmu4= 4 0.385898 -0.000968
#7wOr78 5 0.379542 -0.007324
)2 Omsh 6 0.386121 -0.000745
&n|S:"B 7 0.388123 0.001257
4sj:%%UE 8 0.385172 -0.001695
Wa/&H$d\u@ 9 0.386426 -0.000440
"q-,140_ 10 0.387614 0.000748
%Pz'D6
/ 11 0.375242 -0.011624
&7gL&AY8 12 0.386008 -0.000859
N[(ovr 13 0.388606 0.001740
3]*_*<D 14 0.383519 -0.003347
"cK@Yo 15 0.381154 -0.005712
4V$DV!dPQ} 16 0.382717 -0.004149
Z$8X1(o 17 0.388328 0.001462
<G5d{rKZ 18 0.386187 -0.000679
K
>-)O=$s 19 0.385583 -0.001283
3I rmDT 20 0.383495 -0.003371
zsQhydTR _~^JRC[q Nominal 0.386866
Pf?*bI Best 0.388606
%J_`-\)"{~ Worst 0.375242
'dnTu@mUT Mean 0.384451
(l|:$%[0 Std Dev 0.003324
("UzMr, T'n~QfU Compensator Statistics:
R4?OFhN9 Change in back focus:
G! y~Y]e Minimum : -0.011827
JZCRu_M>| Maximum : 0.006609
sQBl9E'!be Mean : 0.000099
k"J[mT$b Standard Deviation : 0.004182
p6qza @ q- U/JC 90% >= 0.379542
'+!@c&d#%o 50% >= 0.385583
T8ga)BA 10% >= 0.388123
(sngq{*%%z kt.y"^ End of Run