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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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r [6RfS Q4wc-s4RN #T \ L3前面两竖线是
光阑 / Z!i;@Wf \ e,?rH 公差分析结果:
`^##b6jH 3hS6jS Units are Millimeters.
<zfKC wPnybb{ Paraxial Focus compensation is on. In this mode, all
{oWsh)[x2 compensators are ignored, except paraxial back focus change.
"^%Z'ou ]US[5)EL- WARNING: Boundary constraints on compensators are ignored when
1V%'.l9 using fast mode or user-defined merit functions.
A1A3~9HuK s;{K!L@ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
70Ka! Mode : Sensitivities
E*|tOj9`1n Sampling : 3
>5Lexj Optimization Cycles : Automatic mode
FFe)e>bH Nominal Criteria : 0.38686619
<4mQ*6 Test Wavelength : 0.5460
qI2'u % Fe$/t( Fields: User Defined Real Image height in Millimeters
T=\!2gt # X-Field Y-Field Weight VDX VDY VCX VCY
.Z%G@X* 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
%^.P~s6 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
_/ Os^ >R 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
R]QpMj%o 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
nY^Nbh0 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
l4ouZR 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
Vz w PBQ - |F!F{d^p Sensitivity Analysis:
,
Oli OD+5q(!"a |------------ Minimum ------------| |------------ Maximum ------------|
TnE+[.Qu Type Value Criteria Change Value Criteria Change
uD)-V;}P@; TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
L2|aHI1'l TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
6^YJ] w TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
ZBc|438[ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
#WufZ18# TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
P*G+eqX TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
Q$=*aUU%G V(mnyI Worst offenders:
X+ f9q0 Type Value Criteria Change
yFM>T\@ TTHI 10 11 -0.010000 0.375901 -0.010965
xl]
;*& TTHI 4 6 0.010000 0.378999 -0.007867
<NB41/ TTHI 2 3 0.010000 0.380196 -0.006670
Oif,|: TTHI 7 8 -0.010000 0.380585 -0.006282
fp&Got!pB TTHI 4 6 -0.010000 0.380717 -0.006149
`ROEV~ TTHI 10 11 0.010000 0.385879 -0.000987
UK3a{O[5 TTHI 2 3 -0.010000 0.386393 -0.000473
)5yj/0oT TTHI 7 8 0.010000 0.386480 -0.000386
t ;-L{`mW TTHI 12 13 0.010000 0.386709 -0.000158
kx{!b3" TTHI 14 15 0.010000 0.386722 -0.000144
SS8ocGX H(qm>h$bU <qY5SV, Estimated Performance Changes based upon Root-Sum-Square method:
QN
G& Nominal MTF : 0.3869
6Rz[?-mkLO Estimated change : -0.0124
r
nBOj#N Estimated MTF : 0.3745
R&So4},B DO^y;y> Compensator Statistics:
Q4K+*Fi} Change in back focus:
|:2c$zq Minimum : -0.008974
jA`a/vWu Maximum : 0.008997
Hed$ytMaGz Mean : 0.000002
?`P2'i<b Standard Deviation : 0.004372
uO'/|[`8 \P?A7vuhLs A1_ J sS Monte Carlo Analysis:
Y@} FL;3 Number of trials: 20
a[C&e,)} J{~Rxa Initial Statistics: Normal Distribution
#IX&9 aFB} 7rIlTrG Trial Criteria Change
Z"tQpJg 1 0.381931 -0.004936
XO
wiHW{ 2 0.386597 -0.000269
`&g:d E(j 3 0.380763 -0.006103
~:2K#q5C 4 0.385898 -0.000968
`clB43i 5 0.379542 -0.007324
~@fR[sg< 6 0.386121 -0.000745
_^T}_ 7 0.388123 0.001257
n,nisS 8 0.385172 -0.001695
+X^4;
& 9 0.386426 -0.000440
;[Tyt[
10 0.387614 0.000748
?,% TU&Yn 11 0.375242 -0.011624
.,mPdVof 12 0.386008 -0.000859
{tt$w>X 13 0.388606 0.001740
\"d?=uFe 14 0.383519 -0.003347
8"M<{72U] 15 0.381154 -0.005712
KO,_6>8]U 16 0.382717 -0.004149
"$8w.C 17 0.388328 0.001462
rJ(OAKnY 18 0.386187 -0.000679
93D
\R 19 0.385583 -0.001283
Qp!J:YV 20 0.383495 -0.003371
(6k>FSpg M 9"-WIG@h Nominal 0.386866
V2<i/6~ Best 0.388606
o!Fl]3F Worst 0.375242
q^Inb)FeN Mean 0.384451
|s|/]aD}o Std Dev 0.003324
K-4tdC3 v@_in(dk Compensator Statistics:
Mi74Xl i Change in back focus:
,qy&|4Jz Minimum : -0.011827
uaxB -PZ Maximum : 0.006609
^saM$e^c: Mean : 0.000099
'v`_Ii|- Standard Deviation : 0.004182
F^rl$#pCS /=ylQn3
* 90% >= 0.379542
p7UTqKi 50% >= 0.385583
_?b;0{93u 10% >= 0.388123
xG%*PNM0q e?<D F.Md+ End of Run