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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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光阑 inu.U[. L]Tj]u) 公差分析结果:
u>XXKlW: `M@ESA(e Units are Millimeters.
]LE,4[VxRz I|X`9 Paraxial Focus compensation is on. In this mode, all
&;Ncc,jb compensators are ignored, except paraxial back focus change.
hY)zKX_r ?QP>rm WARNING: Boundary constraints on compensators are ignored when
" ityx? using fast mode or user-defined merit functions.
kZ9Gl!g 7qC
/a
c Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
snbXAx1L Mode : Sensitivities
$tlBI:ay1 Sampling : 3
:ez76oGyc Optimization Cycles : Automatic mode
2;)IBvK Nominal Criteria : 0.38686619
5Tn< Test Wavelength : 0.5460
lMv6QL\>' 2dts}G Fields: User Defined Real Image height in Millimeters
bTs2$81[ # X-Field Y-Field Weight VDX VDY VCX VCY
c |0p'EQ 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
#}Qe{4L 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
It*U"4lgi 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
ju2H0AQ 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
PKlR_#EB? 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
^EIuGz1@0 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
!(*&P ,[n9DPZ Sensitivity Analysis:
0f4 y"9m +|C@B`h |------------ Minimum ------------| |------------ Maximum ------------|
kEh9J>|M Type Value Criteria Change Value Criteria Change
|5>Tf6$( TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
yLRe'5#m TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
,Uh^e]pC TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
F=\
REq TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
D;sG9Hky TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
m%9Yo%l~ TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
(N/u@ M r'noB<|e Worst offenders:
O%%Q./oh Type Value Criteria Change
fhi}x( TTHI 10 11 -0.010000 0.375901 -0.010965
QRQ{Bq}# TTHI 4 6 0.010000 0.378999 -0.007867
F`KXG$ TTHI 2 3 0.010000 0.380196 -0.006670
(-ELxshd TTHI 7 8 -0.010000 0.380585 -0.006282
X#1WzWk' TTHI 4 6 -0.010000 0.380717 -0.006149
\p:)Cdn TTHI 10 11 0.010000 0.385879 -0.000987
taDe^Istj TTHI 2 3 -0.010000 0.386393 -0.000473
G
1{m" 1M TTHI 7 8 0.010000 0.386480 -0.000386
)[eTZg TTHI 12 13 0.010000 0.386709 -0.000158
A}"|_&E TTHI 14 15 0.010000 0.386722 -0.000144
.QY>@b\ F=5+JjrX Av.`'.b Estimated Performance Changes based upon Root-Sum-Square method:
pZ Uy ( Nominal MTF : 0.3869
ESviWCh0Fl Estimated change : -0.0124
[XPAI[" Estimated MTF : 0.3745
X$<pt,}% PY|zN| Compensator Statistics:
*BxU5)O Change in back focus:
vdXi'< Minimum : -0.008974
+:Xg7H* Maximum : 0.008997
'oz$uvX Mean : 0.000002
a|TUH+| Standard Deviation : 0.004372
sudh=_+> h~QQ- e!=7VEB Monte Carlo Analysis:
8K^#$,.." Number of trials: 20
>0 7i"a WiZkIZ Initial Statistics: Normal Distribution
P|1 D6
/1TK+E$ Trial Criteria Change
iwIn3R, 1 0.381931 -0.004936
*/~|IbZ`o 2 0.386597 -0.000269
_I)TO_L; 3 0.380763 -0.006103
'`tFZfT 4 0.385898 -0.000968
NXLb'mH~ 5 0.379542 -0.007324
xqdkc^b 6 0.386121 -0.000745
#Br`;hL<T 7 0.388123 0.001257
Q?hf2iw 8 0.385172 -0.001695
9~^k3!>0 9 0.386426 -0.000440
=2*2$ 10 0.387614 0.000748
4]}d'x& 11 0.375242 -0.011624
%-YWn`yEm 12 0.386008 -0.000859
BZOl&G( 13 0.388606 0.001740
},<Y
\
14 0.383519 -0.003347
o^5UHFxTCB 15 0.381154 -0.005712
t<+>E_Xw 16 0.382717 -0.004149
uD{^1c3x 17 0.388328 0.001462
[6\O
<-? 18 0.386187 -0.000679
~Y0K Wx4 19 0.385583 -0.001283
EId>%0s5 20 0.383495 -0.003371
1A93ol=
p Dg!Cs Nominal 0.386866
X'.lh#& Best 0.388606
DZ`,QWuA Worst 0.375242
lX.1B&T9Lr Mean 0.384451
Ur[ai6LNG Std Dev 0.003324
Lcg1X3$G I+Y Z+ Compensator Statistics:
;
p+C0!B2 Change in back focus:
e Vj 8u Minimum : -0.011827
]}S9KP Maximum : 0.006609
EGRIhnED# Mean : 0.000099
]c\`EHN Standard Deviation : 0.004182
lib^JJF * W"Pv,: 90% >= 0.379542
iyR5mA 50% >= 0.385583
PMiu " 10% >= 0.388123
J>hjIN TJcHqzcUc End of Run