学习
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。
7/OOq=z UUEDCtF)
gMK3o8B/ z?_}+ L3前面两竖线是
光阑 n_Hnk4 3^-)gK 公差分析结果:
O>F.Wf5g <sFf'W_3{ Units are Millimeters.
.-26 N6S ,G/X"t ~ Paraxial Focus compensation is on. In this mode, all
A`/7>'k/q[ compensators are ignored, except paraxial back focus change.
:pjK\ r`g;k&"a WARNING: Boundary constraints on compensators are ignored when
>]|^Ux,WZ using fast mode or user-defined merit functions.
WI4_4 kuud0VWJ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
MGC0^voe Mode : Sensitivities
! tPK"k Sampling : 3
qmyZbo|8& Optimization Cycles : Automatic mode
&E'>+6 Nominal Criteria : 0.38686619
Cwa0!y5% Test Wavelength : 0.5460
257;@; g(r'Y#U Fields: User Defined Real Image height in Millimeters
)ZU#19vr7 # X-Field Y-Field Weight VDX VDY VCX VCY
4sE=WPKF# 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
B;7s ]R 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
qq%_ksQ 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
z}N^`_ * 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
%t|2GIu 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
&ziB#(&:H 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
vCo}-b-j 3:Egqw Sensitivity Analysis:
5e8-?w%e M 6Z`Pwv]; |------------ Minimum ------------| |------------ Maximum ------------|
ZS>/ 5 Type Value Criteria Change Value Criteria Change
"m)O13x TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
e/D\7Pf TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
C4TD@ TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
ywtDz8!^u TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
|-Klh TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
)4~XZt1r TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
DYk->)
62'0 )Cy^ Worst offenders:
{"(|oIo{ Type Value Criteria Change
xW )8mv?4n TTHI 10 11 -0.010000 0.375901 -0.010965
#^w 1!xXD TTHI 4 6 0.010000 0.378999 -0.007867
}(O
kl1 TTHI 2 3 0.010000 0.380196 -0.006670
]= D TTHI 7 8 -0.010000 0.380585 -0.006282
ATewdq[C TTHI 4 6 -0.010000 0.380717 -0.006149
E0Xu9IW/A TTHI 10 11 0.010000 0.385879 -0.000987
a'fb0fz TTHI 2 3 -0.010000 0.386393 -0.000473
o%Q'<0d TTHI 7 8 0.010000 0.386480 -0.000386
S%|'
/cFo TTHI 12 13 0.010000 0.386709 -0.000158
NPq2C8: TTHI 14 15 0.010000 0.386722 -0.000144
uV\#J{'* {lw
ec"{ t?&ajh Estimated Performance Changes based upon Root-Sum-Square method:
L7="! I Nominal MTF : 0.3869
n8C {Okr Estimated change : -0.0124
%['F[Mo Estimated MTF : 0.3745
5Z0x2jV 7cSvAX0Z. Compensator Statistics:
2!`Z3>Oa Change in back focus:
sAj$U^Gp Minimum : -0.008974
BNLall Maximum : 0.008997
z`6KX93 Mean : 0.000002
tjL#?j Standard Deviation : 0.004372
|0Kt@AJY yrb%g~ELGn cZi&L p Monte Carlo Analysis:
32J Number of trials: 20
Jx,s.Z0@7, VAz+J Initial Statistics: Normal Distribution
Cu5
- w ON^u|*kO Trial Criteria Change
7]
H4E.(l 1 0.381931 -0.004936
!b
Km}1T 2 0.386597 -0.000269
<7h'MNf& 3 0.380763 -0.006103
#7) 6X:/O 4 0.385898 -0.000968
Cr"hu; 5 0.379542 -0.007324
#wcoLCjs) 6 0.386121 -0.000745
WocFID:b 7 0.388123 0.001257
E_#&L({|@ 8 0.385172 -0.001695
]z$<6+G 9 0.386426 -0.000440
6
>2!
kM7 10 0.387614 0.000748
oWT0WS 11 0.375242 -0.011624
Z%{2/mQ 12 0.386008 -0.000859
=!2 13 0.388606 0.001740
|hAGgo/03 14 0.383519 -0.003347
Y"U&3e, 15 0.381154 -0.005712
uDUSR+E> 16 0.382717 -0.004149
"^7Uk#!
7 17 0.388328 0.001462
$~l:l[Zs 18 0.386187 -0.000679
-R]S)Odml 19 0.385583 -0.001283
pgarGaeq 20 0.383495 -0.003371
#YV;Gp(2h P^r8JhDJ Nominal 0.386866
}s9J+m Best 0.388606
LNWp$" Worst 0.375242
SJmri]4K Mean 0.384451
@A%`\Ea% Std Dev 0.003324
4O'ho0w7 TW$^]u~v Compensator Statistics:
U bXz`i Change in back focus:
n1V*VQV Minimum : -0.011827
fzcT(y
Maximum : 0.006609
+-i@R% Mean : 0.000099
ewR0e.g Standard Deviation : 0.004182
W\.(~-(So B:SRHd{*Wu 90% >= 0.379542
#:X:~T 50% >= 0.385583
N[%IrN3 10% >= 0.388123
Spb'jAKj' c_i;' End of Run