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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。
@zVBn~=i z?b(|f\! L;(3u' Rp4BU"&sU L3前面两竖线是
光阑 n<"a+TTU >x _:=%Wr+ 公差分析结果:
+ - KRp1qq S|u1QGB Units are Millimeters.
/i]=ndAk e4NX\tCpw Paraxial Focus compensation is on. In this mode, all
j{Qbzczy, compensators are ignored, except paraxial back focus change.
-$!Pf$l@ zWR*g/i WARNING: Boundary constraints on compensators are ignored when
U
mx using fast mode or user-defined merit functions.
"351s3ff
XH Zu>[ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
A?{aUQB~| Mode : Sensitivities
fAA@ziKg Sampling : 3
yrvSbqR Optimization Cycles : Automatic mode
*7D$;?" Nominal Criteria : 0.38686619
nH3b<k;S Test Wavelength : 0.5460
YQ[&h bUg 2Bm!y Fields: User Defined Real Image height in Millimeters
:N'[de # X-Field Y-Field Weight VDX VDY VCX VCY
6[Pr<4J 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
S r#fyr 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
`
a<|CcUGU 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
MdTd$ 4J3 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
}?ac<> u& 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
hcqmjqJ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
`a1R "A Dm`U|<o Sensitivity Analysis:
_$jJpy 3E2.v5* |------------ Minimum ------------| |------------ Maximum ------------|
NB6h/0*v Type Value Criteria Change Value Criteria Change
tZ{q\+h TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
PFn[[~5V TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
kpMM%"=V TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
V/[,1W[B TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
fm2M i~}0 TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
0{Ll4 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
=rtA{g$)+ h,jAtL! Worst offenders:
9,a,A6xry Type Value Criteria Change
OQb9ijLeK TTHI 10 11 -0.010000 0.375901 -0.010965
Chi<)P$^ TTHI 4 6 0.010000 0.378999 -0.007867
LkbvA TTHI 2 3 0.010000 0.380196 -0.006670
!iz vY TTHI 7 8 -0.010000 0.380585 -0.006282
n[w,x; TTHI 4 6 -0.010000 0.380717 -0.006149
CzsY=DBH= TTHI 10 11 0.010000 0.385879 -0.000987
oP`M\KXau TTHI 2 3 -0.010000 0.386393 -0.000473
N %/DN TTHI 7 8 0.010000 0.386480 -0.000386
DO,&Foh\ TTHI 12 13 0.010000 0.386709 -0.000158
s\1_-D5]Z TTHI 14 15 0.010000 0.386722 -0.000144
!5 :[X vI# ob5nk^y Ol5xyj Estimated Performance Changes based upon Root-Sum-Square method:
Z1lF[d,f; Nominal MTF : 0.3869
jHw2Q8s|R Estimated change : -0.0124
*t*&Q /W Estimated MTF : 0.3745
< 3+&DV-<N rxk{Li<9 Compensator Statistics:
A
=#-u&l Change in back focus:
h9smviU7u Minimum : -0.008974
Q>c6ouuJ Maximum : 0.008997
"@?kxRn! Mean : 0.000002
cTx/Y&\9 Standard Deviation : 0.004372
[cAg'R6 b1^Yxe#L *K^O oS Monte Carlo Analysis:
9F1stT0G% Number of trials: 20
oi4Wxcj g*imswj7 Initial Statistics: Normal Distribution
wupD FAl 6 Trial Criteria Change
1>{-wL4rc 1 0.381931 -0.004936
17 iq 2 0.386597 -0.000269
~*]`XL.- 3 0.380763 -0.006103
(>`SS#(T! 4 0.385898 -0.000968
xyWdzc](p 5 0.379542 -0.007324
^TuEp$Z= 6 0.386121 -0.000745
E}j8p_p 7 0.388123 0.001257
F@K;A%us) 8 0.385172 -0.001695
sBI%lrO 9 0.386426 -0.000440
5kNs@FP 10 0.387614 0.000748
RYaofW 11 0.375242 -0.011624
;7*@Gf}R 12 0.386008 -0.000859
0!
%} 13 0.388606 0.001740
shvcc 14 0.383519 -0.003347
<&Xq`i/( 15 0.381154 -0.005712
uL AXN 16 0.382717 -0.004149
3m7V6##+ 17 0.388328 0.001462
l;kZS 18 0.386187 -0.000679
nQ3goVRFP 19 0.385583 -0.001283
M 7$4KFNp 20 0.383495 -0.003371
s4k%ty} x^skoz Nominal 0.386866
k(+u"T Best 0.388606
?tQv|x Worst 0.375242
A6.'1OD Mean 0.384451
!\4FIs&Qv Std Dev 0.003324
=6YO!B>7 n9-[z2n Compensator Statistics:
N\&;R$[9: Change in back focus:
6\@, Lb Minimum : -0.011827
r0bPaAKw Maximum : 0.006609
@ xr Mean : 0.000099
X6 cb#s0| Standard Deviation : 0.004182
gOAluP R/|{?:r?:x 90% >= 0.379542
0+i,,^x. 50% >= 0.385583
!S{<Xc'wv 10% >= 0.388123
XjU; oh4:. ;mlIWn End of Run