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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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ShP V!$0 k[m-"I%ZFX L3前面两竖线是
光阑 8a{g EZT, cPSpPx 公差分析结果:
w4mL/j N3)EG6vE* Units are Millimeters.
Os;\\~e5 `x3c},'@k Paraxial Focus compensation is on. In this mode, all
D1a4+AyI compensators are ignored, except paraxial back focus change.
aMWNZv V7<}
;Lzm WARNING: Boundary constraints on compensators are ignored when
Nt?B(.G using fast mode or user-defined merit functions.
BVDo5^&W :#vrNg(M Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
>E# 4mm Mode : Sensitivities
Yy]Henw; Sampling : 3
+$C5V,H~ Optimization Cycles : Automatic mode
R !HL+ Nominal Criteria : 0.38686619
2Qy&V/E ? Test Wavelength : 0.5460
j<u`W|vl a>6p])Wh Fields: User Defined Real Image height in Millimeters
(J;<&v}Gad # X-Field Y-Field Weight VDX VDY VCX VCY
lK0coj1+ 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
FqySnr JQ 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
(msJ:SG 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
D
KOdqTW 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
A'T! og|5 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
"cZ.86gG`: 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
pmZr<xs Zx6BK=4G Sensitivity Analysis:
O\?ei+(H7 EW)]75o{QF |------------ Minimum ------------| |------------ Maximum ------------|
[&$z[/4:8c Type Value Criteria Change Value Criteria Change
\W4SZR%u TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
BTB,a$P/ TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
{v(3[7 TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
vhKD_}}aP TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
3JwmLGj} TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
aE+E'iL TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
p-Z5 {by zPn8>J<.0Q Worst offenders:
MEE]6nU Type Value Criteria Change
Rh39x-`Z TTHI 10 11 -0.010000 0.375901 -0.010965
0>vm&W<?) TTHI 4 6 0.010000 0.378999 -0.007867
B; ~T|ex u TTHI 2 3 0.010000 0.380196 -0.006670
Mw <1 TTHI 7 8 -0.010000 0.380585 -0.006282
GCrMrZ6 TTHI 4 6 -0.010000 0.380717 -0.006149
!HFwQGP.Y TTHI 10 11 0.010000 0.385879 -0.000987
4&tY5m> TTHI 2 3 -0.010000 0.386393 -0.000473
]0o78(/w2 TTHI 7 8 0.010000 0.386480 -0.000386
[e (- TTHI 12 13 0.010000 0.386709 -0.000158
gxF3gM TTHI 14 15 0.010000 0.386722 -0.000144
a83o(9 |m ~| R]dc(D Estimated Performance Changes based upon Root-Sum-Square method:
]>!]X*\9 Nominal MTF : 0.3869
H&I0\upd Estimated change : -0.0124
rz4S"4 Estimated MTF : 0.3745
QJxcH$ o9JJ_-O" Compensator Statistics:
"p<f#s} Change in back focus:
3N?uY2 Minimum : -0.008974
mIOx)`$ Maximum : 0.008997
Mv_4*xVc Mean : 0.000002
Te;`-EL Standard Deviation : 0.004372
:iq1-Pw >LLFe~9`g FJ/kumq Monte Carlo Analysis:
dz?:)5>I Number of trials: 20
7p|Pv;wp| ~s+\Y/@A Initial Statistics: Normal Distribution
\;4RD$J T. {P}#'| Trial Criteria Change
[mX\Q`)QP 1 0.381931 -0.004936
Fm:Ri$iT 2 0.386597 -0.000269
)U5AnL 3 0.380763 -0.006103
pDW .Pav 4 0.385898 -0.000968
Hh,\>= ': 5 0.379542 -0.007324
/6g*WX2P1 6 0.386121 -0.000745
p=p,sJ/@ 7 0.388123 0.001257
J-=&B5"O> 8 0.385172 -0.001695
HyZh27PE 9 0.386426 -0.000440
5'6Oan7dL: 10 0.387614 0.000748
~zi&u46 11 0.375242 -0.011624
}6`#u:OZ 12 0.386008 -0.000859
znD0&CS9q 13 0.388606 0.001740
od$Cm5 14 0.383519 -0.003347
y "gYv 15 0.381154 -0.005712
hCM+=]z" 16 0.382717 -0.004149
L ej3? k 17 0.388328 0.001462
5s8k^n"A 18 0.386187 -0.000679
wTqgH@rGtR 19 0.385583 -0.001283
~r+;i,,X 20 0.383495 -0.003371
A+>+XA' (;\JCeGA Nominal 0.386866
6~j6M4* Best 0.388606
7h0LR7 Worst 0.375242
ZxY%x/K Mean 0.384451
pFhznH{0 Std Dev 0.003324
*IfLoKS' 7iT#dpF/A Compensator Statistics:
bvi
Y.G3 Change in back focus:
SK#;/fav6 Minimum : -0.011827
'jqkDPn Maximum : 0.006609
<t\!g Mean : 0.000099
kect)=T( Standard Deviation : 0.004182
sZA7)Z`7 /U+0T>(HS 90% >= 0.379542
sBt,y_LW 50% >= 0.385583
J.35Ad1hM 10% >= 0.388123
v:|_!+g: :.J Ad$>P End of Run