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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 cfy/*| 9$4/frd 公差分析结果:
YWn6wzu%Vc U{za m Units are Millimeters.
aQym=
6%e R;Gl{ Paraxial Focus compensation is on. In this mode, all
r-\T}e2Gz compensators are ignored, except paraxial back focus change.
FRJ:ym=E X'3`Q S:! WARNING: Boundary constraints on compensators are ignored when
dWq/)%@t using fast mode or user-defined merit functions.
k_|v)\4B P*"AtZuY] Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
1>*UbV<R;u Mode : Sensitivities
_sf0{/< ) Sampling : 3
]%Q]C
8[C Optimization Cycles : Automatic mode
kgbr+Yw2X Nominal Criteria : 0.38686619
{pQ@0b Test Wavelength : 0.5460
~gLEh tW "DcueU#! Fields: User Defined Real Image height in Millimeters
_QOOx+%*5 # X-Field Y-Field Weight VDX VDY VCX VCY
0u&?Zy9& 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
G+QNg.pH 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
t$PnQ@xu 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
q3pN/f;kr, 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
}5Tyz i( 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
Gad2EEZ%0 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
0F0(]7g^ l_q>(FoqA Sensitivity Analysis:
;P0Y6v3 }9+1<mT9a/ |------------ Minimum ------------| |------------ Maximum ------------|
U~B}vt Type Value Criteria Change Value Criteria Change
uI:3$ TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
WNlSve)]ie TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
I?B,rT3h TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
s2' :&5( TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
yM#trqv5 TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
NE>JtTF< TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
zHum&V8=H 51;%\@= Worst offenders:
^D>M Dj6 Type Value Criteria Change
YI\Cs=T/ TTHI 10 11 -0.010000 0.375901 -0.010965
pi l*/&pB TTHI 4 6 0.010000 0.378999 -0.007867
j C1^>D TTHI 2 3 0.010000 0.380196 -0.006670
a ~iEps TTHI 7 8 -0.010000 0.380585 -0.006282
[sO<6?LY TTHI 4 6 -0.010000 0.380717 -0.006149
<+1w'- TTHI 10 11 0.010000 0.385879 -0.000987
]v,y(yl TTHI 2 3 -0.010000 0.386393 -0.000473
E#X!*q& TTHI 7 8 0.010000 0.386480 -0.000386
Y*X6lo TTHI 12 13 0.010000 0.386709 -0.000158
bHo?Rw!. TTHI 14 15 0.010000 0.386722 -0.000144
f}9`iN=k Jm1AJ4mw PG~m-W+ Estimated Performance Changes based upon Root-Sum-Square method:
fjZveH0
Nominal MTF : 0.3869
JU2' ~chh Estimated change : -0.0124
aFc'_FrQ Estimated MTF : 0.3745
/a/uS3& S?z j&XY3 Compensator Statistics:
*[5#g3 Change in back focus:
Fe2-;o Minimum : -0.008974
WxP4{T* < Maximum : 0.008997
w.F3o4YP Mean : 0.000002
(pxz#B4 Standard Deviation : 0.004372
1sJJ"dC.w &i}cC4i (i~%4w= Monte Carlo Analysis:
o!dkS/u-m Number of trials: 20
1bAp{u& b({b5z.A Initial Statistics: Normal Distribution
g$+O<a@ n ?*5l}y= Trial Criteria Change
ez9M]! 8Lt 1 0.381931 -0.004936
F^v{ Jqc 2 0.386597 -0.000269
#Q)w$WR 3 0.380763 -0.006103
RKZk/ly 4 0.385898 -0.000968
<YNPhu~5 5 0.379542 -0.007324
0QSi\: 1f 6 0.386121 -0.000745
z+B 7 0.388123 0.001257
"'dC>7* < 8 0.385172 -0.001695
(#Kvm 9 0.386426 -0.000440
6h*bcb#C 10 0.387614 0.000748
H.S|njn:r 11 0.375242 -0.011624
<6@NgSFz' 12 0.386008 -0.000859
[5#/&k{ 13 0.388606 0.001740
b,V=B{(~ 14 0.383519 -0.003347
V1V4 <Zj 15 0.381154 -0.005712
IIEU{},}z 16 0.382717 -0.004149
2Yf;b9-k 17 0.388328 0.001462
!Yi<h/: 18 0.386187 -0.000679
5DBd
[u3 19 0.385583 -0.001283
_4#psxl[M 20 0.383495 -0.003371
|,~A9 t`3T_t Y Nominal 0.386866
)8>f Best 0.388606
`\uv+^x{ Worst 0.375242
t/BiZo|zl Mean 0.384451
G7{:d Std Dev 0.003324
Jg6[/7*m ~PvzUT-^ Compensator Statistics:
m1Z8SM+ Change in back focus:
i 58CA? Minimum : -0.011827
+~AI(h Maximum : 0.006609
qUg4-Z4 Mean : 0.000099
*\+'tFT6 Standard Deviation : 0.004182
@Oay$gP{T JKbB, 90% >= 0.379542
Mo=-P2)>lt 50% >= 0.385583
9!C?2*>A P 10% >= 0.388123
5gEWLLDp 2|o$eq3t End of Run