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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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F FR_1Vf G5"UhnOD' L3前面两竖线是
光阑 ;|soc:aH JT[|l-\zo 公差分析结果:
yFl@z
Rc0OEs%7P Units are Millimeters.
HR\yJt 6}n_r}kNR Paraxial Focus compensation is on. In this mode, all
opte)=]J compensators are ignored, except paraxial back focus change.
!wJ~p:vRdY 'Xxt[Jy WARNING: Boundary constraints on compensators are ignored when
)(PA:j using fast mode or user-defined merit functions.
8!b#ez L:XnW1(Or Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
Xv]O1 f cI Mode : Sensitivities
6Nj\N oS Sampling : 3
/XS}<!)% Optimization Cycles : Automatic mode
1q}iUnR Nominal Criteria : 0.38686619
jNaK] Test Wavelength : 0.5460
Q;)[~p tL 3]9qfj Fields: User Defined Real Image height in Millimeters
_?Rprmjx} # X-Field Y-Field Weight VDX VDY VCX VCY
5``/exG> 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
Ad9'q!_en 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
,kpkXK 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
vbmi_[,U 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
>y(;k|-$ 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
(pREo/ T 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
jXSo{ A%k@75V@ Sensitivity Analysis:
8JJqEkQ +]Po!bN@@ |------------ Minimum ------------| |------------ Maximum ------------|
g9<*+fV
2$ Type Value Criteria Change Value Criteria Change
5^ARC^v TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
^UEI`_HO0 TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
?E^~z- TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
?Z.p.v TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
kHo0I8
TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
QO[! TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
g&`e2|[7 GXYmJ4wR Worst offenders:
c] $X+ Type Value Criteria Change
(5cc{zKtR TTHI 10 11 -0.010000 0.375901 -0.010965
pBL,kqYNA> TTHI 4 6 0.010000 0.378999 -0.007867
vYKKv%LE TTHI 2 3 0.010000 0.380196 -0.006670
PL@hsZty~c TTHI 7 8 -0.010000 0.380585 -0.006282
;8'hvc3i$ TTHI 4 6 -0.010000 0.380717 -0.006149
!0zbWB9 TTHI 10 11 0.010000 0.385879 -0.000987
GXr9J rs.e TTHI 2 3 -0.010000 0.386393 -0.000473
plh.-" TTHI 7 8 0.010000 0.386480 -0.000386
?k TVC TTHI 12 13 0.010000 0.386709 -0.000158
z4HIDb TTHI 14 15 0.010000 0.386722 -0.000144
Xjw>Qws t:eZ`6o$T\ }JeGjpAcV Estimated Performance Changes based upon Root-Sum-Square method:
COH0aNp; Nominal MTF : 0.3869
sG=D(n1 Estimated change : -0.0124
9s>q4_D Estimated MTF : 0.3745
}TzMWdT 3=RV Jb Compensator Statistics:
=3]}87 Change in back focus:
Ynl^Z Minimum : -0.008974
^
|z|kc Maximum : 0.008997
EcxPbRg Mean : 0.000002
aHNR0L3$}{ Standard Deviation : 0.004372
j1Fy'os"! r{!]`
'8 ] JVs/ Monte Carlo Analysis:
'-oS=OrZ Number of trials: 20
,)TtI~6Q lr'h Initial Statistics: Normal Distribution
i,r O3Jn .vE=527g) Trial Criteria Change
V7[6jWgH 1 0.381931 -0.004936
twv|,kM 2 0.386597 -0.000269
![h+R@_( 3 0.380763 -0.006103
x$Y44v'> 4 0.385898 -0.000968
$N'AZY]4] 5 0.379542 -0.007324
jfP2n5X83 6 0.386121 -0.000745
O-J;iX } 7 0.388123 0.001257
"(zvI>A 8 0.385172 -0.001695
ZJ}9g(X..g 9 0.386426 -0.000440
W/!M
eTU&E 10 0.387614 0.000748
'3TwrY?- 11 0.375242 -0.011624
BgRfy2: 12 0.386008 -0.000859
`Fnl<C< 13 0.388606 0.001740
)9I>y2WU~ 14 0.383519 -0.003347
}{T9`^V:h 15 0.381154 -0.005712
-sO[,
16 0.382717 -0.004149
\UA\0p 17 0.388328 0.001462
eG&\b-% 18 0.386187 -0.000679
3#N'nhUzA 19 0.385583 -0.001283
]L+YnZ?6 20 0.383495 -0.003371
3*)<Y}Tc #hG0{_d7 Nominal 0.386866
Uc%n{
a-a Best 0.388606
jBZlNEw Worst 0.375242
W!vN(1:( Mean 0.384451
M8dv
y!D Std Dev 0.003324
% `Q[?(z hgIqr^N9 Compensator Statistics:
'NJGez'b, Change in back focus:
w0qrh\3du Minimum : -0.011827
EQ
'L" Maximum : 0.006609
Y-!~x0-H Mean : 0.000099
7k,pUC-w7c Standard Deviation : 0.004182
aF*KY<w PD #9Z=Hj 90% >= 0.379542
i7$4i| 50% >= 0.385583
W>f q 9 10% >= 0.388123
!dnCrR er@"4R0 End of Run