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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。
E.LD1Pm0 8L1vtYz H?oBax: O2{~Q{p L3前面两竖线是
光阑 L)(JaZyV5 xbqFek$/r 公差分析结果:
/{Mo'.=Z 27J!oin$ Units are Millimeters.
5-*hAOThg %B}<5iO Paraxial Focus compensation is on. In this mode, all
8FT]B/^&m compensators are ignored, except paraxial back focus change.
QQI,$HId $|"Y|3&X WARNING: Boundary constraints on compensators are ignored when
P K+rr.k] using fast mode or user-defined merit functions.
(1IYOlG4 U_Jchi,! Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
DplS\}='s Mode : Sensitivities
YuXCRw9p; Sampling : 3
lQl!TW"aO Optimization Cycles : Automatic mode
=Gv*yR*]t Nominal Criteria : 0.38686619
~7=eHU.@ Test Wavelength : 0.5460
Y-?0!a=e. &zR\Rmpt Fields: User Defined Real Image height in Millimeters
/
f5q9sp8 # X-Field Y-Field Weight VDX VDY VCX VCY
JtvZ~s 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
Bo,>blspw 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
&x9>8~
3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
4%B0H> 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
tgyW:<iv 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
s5/u>d 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
J8'1 ~$6 k=W~ot& Sensitivity Analysis:
0Ra%>e(I^ K<rv|bJ |------------ Minimum ------------| |------------ Maximum ------------|
57wHo[CJ Type Value Criteria Change Value Criteria Change
H@xHkqan TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
f@@7?5fW TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
yJK:4af;. TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
a,|Hn TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
2U|"]tpM& TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
i/.#` TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
J`]9n>G 1=Kt.tuf Worst offenders:
\ 5.nr*5 Type Value Criteria Change
1Q_Q-Z TTHI 10 11 -0.010000 0.375901 -0.010965
Cag^$nj TTHI 4 6 0.010000 0.378999 -0.007867
7qSnP30} TTHI 2 3 0.010000 0.380196 -0.006670
)1f%kp#] TTHI 7 8 -0.010000 0.380585 -0.006282
?edf$-"z/ TTHI 4 6 -0.010000 0.380717 -0.006149
J8-K TTHI 10 11 0.010000 0.385879 -0.000987
O3V.4tp TTHI 2 3 -0.010000 0.386393 -0.000473
5X>K#N TTHI 7 8 0.010000 0.386480 -0.000386
)K8^}L, TTHI 12 13 0.010000 0.386709 -0.000158
[_eT{v2B4 TTHI 14 15 0.010000 0.386722 -0.000144
hg%iv%1B' l 88n*O #<~oR5ddlb Estimated Performance Changes based upon Root-Sum-Square method:
;Fo7 -kK Nominal MTF : 0.3869
u6 QW*8b4 Estimated change : -0.0124
We++DWp Estimated MTF : 0.3745
,.kmUd / Xq|SO Compensator Statistics:
s#'Vasu Change in back focus:
k8\KCKql Minimum : -0.008974
L@'2}7N1% Maximum : 0.008997
\QQWh wE Mean : 0.000002
cTW$;Fpc+ Standard Deviation : 0.004372
7H*,HZc@= g:O/~L0Xb <FX]n< Monte Carlo Analysis:
T6b~uE Number of trials: 20
YZ]}l%e GSs?!BIC Initial Statistics: Normal Distribution
k.7!)jL7 *<:6A&'D9 Trial Criteria Change
q %j8Js 1 0.381931 -0.004936
Hs$HeAp; 2 0.386597 -0.000269
HE{UgU:tY 3 0.380763 -0.006103
rizjH+ 4 0.385898 -0.000968
yZ!~m3Q 5 0.379542 -0.007324
_k :BY 6 0.386121 -0.000745
$vK,Gugcx 7 0.388123 0.001257
xbxzB<yL 8 0.385172 -0.001695
Y4w]jIv 9 0.386426 -0.000440
}Ml BmD 10 0.387614 0.000748
H
"Io!{aKU 11 0.375242 -0.011624
KWeE!f 7G 12 0.386008 -0.000859
kOdA8XRY 13 0.388606 0.001740
IhBQ1,&J 14 0.383519 -0.003347
j D*<M/4 15 0.381154 -0.005712
mZXtHFMu 16 0.382717 -0.004149
iITMBS`} 17 0.388328 0.001462
w#hg_RK(Jr 18 0.386187 -0.000679
R|^bZf^ 19 0.385583 -0.001283
}D+ b`, 20 0.383495 -0.003371
).`v&-cK4E *DvX||`& Nominal 0.386866
?(U;T!n Best 0.388606
BeLqk3'/ Worst 0.375242
Tt9cX}&& Mean 0.384451
kGs\"zZM Std Dev 0.003324
E|>-7k") j!kJ@l bP Compensator Statistics:
*zN~x(0{E Change in back focus:
mR|5$1[b Minimum : -0.011827
`&.qHw) Maximum : 0.006609
(,t[`z Mean : 0.000099
w N`Njm9! Standard Deviation : 0.004182
z .\r7 cl1ygpf( 90% >= 0.379542
vE8BB$D 50% >= 0.385583
,\X! :y~ 10% >= 0.388123
j!NXNuy: si)>:e End of Run