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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。
lE:g A, 2{OR#v~ ~^mUu`@r )kD/ 8 L3前面两竖线是
光阑 #z `W ,^C t^rw@$"} 公差分析结果:
?"B]"%M& F!omkN Units are Millimeters.
!|cg= ~Z\:Nx Paraxial Focus compensation is on. In this mode, all
uDF;_bli)H compensators are ignored, except paraxial back focus change.
FcDS*ZEk! \(o"/* WARNING: Boundary constraints on compensators are ignored when
9njwAKF? using fast mode or user-defined merit functions.
Z~5) )5Ye; hx;f/EPx Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
*IG$"nu Mode : Sensitivities
?e7]U*jEU Sampling : 3
^t;z;.g Optimization Cycles : Automatic mode
aB9!}3@ Nominal Criteria : 0.38686619
MY&Jdmga Test Wavelength : 0.5460
yK~=6^M [M?2axOC Fields: User Defined Real Image height in Millimeters
p9(y b # X-Field Y-Field Weight VDX VDY VCX VCY
tXD$HeBB? 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
$XBK_ 5 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
._mep\#.: 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
+X}i%F' 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
k+3qX'fd 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
O7K.\ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
^J!q>KJs /ZLY@&M Sensitivity Analysis:
TJ|Jv8j<s p?@ %/!S |------------ Minimum ------------| |------------ Maximum ------------|
xmW~R*^ Type Value Criteria Change Value Criteria Change
?6#won TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
Tb/TP3N TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
.])prp8 TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
{ _rfhz TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
y_]+;% w: TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
6b|?@ TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
x&}]8S) /zn=AAYb Worst offenders:
4w4B\Na>l Type Value Criteria Change
*7BfK(9T TTHI 10 11 -0.010000 0.375901 -0.010965
/?\3%<vn TTHI 4 6 0.010000 0.378999 -0.007867
<g4}7l8 TTHI 2 3 0.010000 0.380196 -0.006670
tYS4"Nfb+ TTHI 7 8 -0.010000 0.380585 -0.006282
Wboh2:TH: TTHI 4 6 -0.010000 0.380717 -0.006149
2iAC_"n TTHI 10 11 0.010000 0.385879 -0.000987
DL]tg[w{ TTHI 2 3 -0.010000 0.386393 -0.000473
v9$!v^U"D TTHI 7 8 0.010000 0.386480 -0.000386
H=r-f@EOrI TTHI 12 13 0.010000 0.386709 -0.000158
{|;a?]? TTHI 14 15 0.010000 0.386722 -0.000144
s0kp(t!fiu 8xpplo8 wBPo{ Estimated Performance Changes based upon Root-Sum-Square method:
$Y$9]G": Nominal MTF : 0.3869
&hCbXs= Estimated change : -0.0124
>yIJ8IDF Estimated MTF : 0.3745
s?SspuV I7f ^2 Compensator Statistics:
O 4 !$ Change in back focus:
%|Ps|iV Minimum : -0.008974
IG-\& Maximum : 0.008997
5xY{Q Mean : 0.000002
95DEuReKi Standard Deviation : 0.004372
Rx%S<i;9 <v"o+ ! -gU~0 Monte Carlo Analysis:
&)eg3P)7 Number of trials: 20
+)]YvZ6%[, p!.~hw9 Initial Statistics: Normal Distribution
g(7-3q8eq "Fz.#U Trial Criteria Change
DwD$T%kF 1 0.381931 -0.004936
t [QD#; 2 0.386597 -0.000269
{(73*-~$ 3 0.380763 -0.006103
Cs $5Of( 4 0.385898 -0.000968
8h)XULs2 5 0.379542 -0.007324
'\Xkvi 6 0.386121 -0.000745
(8 nv&| 7 0.388123 0.001257
BD g]M/{ 8 0.385172 -0.001695
``o]i{x 9 0.386426 -0.000440
v=`yfCX-qX 10 0.387614 0.000748
lQA5HzC\ 11 0.375242 -0.011624
I[Ra0Q>([k 12 0.386008 -0.000859
5&Oc`5QD 13 0.388606 0.001740
+A9~h/"kt 14 0.383519 -0.003347
%pWn9 15 0.381154 -0.005712
AerU`^ 16 0.382717 -0.004149
%>_[b, 17 0.388328 0.001462
:1v,QEb\ 18 0.386187 -0.000679
&H(yLd[ 19 0.385583 -0.001283
]`^! ]Ql 20 0.383495 -0.003371
8$00\><r xm'9n? Nominal 0.386866
>mGH4{H Best 0.388606
:=QX ^* Worst 0.375242
=KRM`_QShg Mean 0.384451
Aoa8Q
E
Std Dev 0.003324
)0{`}7X rTD +7
)E Compensator Statistics:
:Mx Change in back focus:
=w2 4(S Minimum : -0.011827
Lx"GBEkt7 Maximum : 0.006609
$:ush"=f8^ Mean : 0.000099
8-$t7bV5 Standard Deviation : 0.004182
:uL<UD,vu3 uo F.f$%" 90% >= 0.379542
sEhvx+( 50% >= 0.385583
hU)t5/h;K 10% >= 0.388123
~/OY1~c <O#&D|EMd| End of Run