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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 CS~_>bn -%@ah:iJ 公差分析结果:
o+7)cI 8'%m! Units are Millimeters.
GEA1y^b6" F"UI=7:o Paraxial Focus compensation is on. In this mode, all
9@yF7 compensators are ignored, except paraxial back focus change.
U3Z=X TB oLh ,F"nB WARNING: Boundary constraints on compensators are ignored when
3%5a&b using fast mode or user-defined merit functions.
%1.F;-GdsW doOuc4 Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
w.a9}GC Mode : Sensitivities
cw{TS Sampling : 3
-1RMyVx Optimization Cycles : Automatic mode
$`55 E( Nominal Criteria : 0.38686619
k$JOHru Test Wavelength : 0.5460
[`t ;or 9$HBKcO Fields: User Defined Real Image height in Millimeters
>ItT269G # X-Field Y-Field Weight VDX VDY VCX VCY
8hD[z} 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
0hV#]`9`gN 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
&UOxS W 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
4P k%+l 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
YLGE{bS 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
|w}j!}u 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
]LUcOR &h5Y_no GX Sensitivity Analysis:
<Q\KS o+'|j#P |------------ Minimum ------------| |------------ Maximum ------------|
wlJi_)! Type Value Criteria Change Value Criteria Change
!>n!Q*\(Ov TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
rR-[CT TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
7I
XWv- TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
45sEhs[$ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
>kK@tJn TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
m^}|LB:5 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
$Dj8 a\L {pIh/0 Worst offenders:
r)pt(*KHo Type Value Criteria Change
jts0ZFHc- TTHI 10 11 -0.010000 0.375901 -0.010965
gVfFEF. TTHI 4 6 0.010000 0.378999 -0.007867
EXCE^Vw TTHI 2 3 0.010000 0.380196 -0.006670
A-T-4I TTHI 7 8 -0.010000 0.380585 -0.006282
N68$b#9Ry TTHI 4 6 -0.010000 0.380717 -0.006149
f7~dn#<@ TTHI 10 11 0.010000 0.385879 -0.000987
AX8~w(sv TTHI 2 3 -0.010000 0.386393 -0.000473
<&l$xn TTHI 7 8 0.010000 0.386480 -0.000386
Sk cK>i.[ TTHI 12 13 0.010000 0.386709 -0.000158
b;UBvwY_ TTHI 14 15 0.010000 0.386722 -0.000144
~3?-l/ $ X$we\t |p&EP2?T Estimated Performance Changes based upon Root-Sum-Square method:
p{^:b6 Nominal MTF : 0.3869
pqb'L] Estimated change : -0.0124
]EX6Y Estimated MTF : 0.3745
]O"f % dDpAS#'s\ Compensator Statistics:
e=OHO,74z" Change in back focus:
p|t" 4HQ Minimum : -0.008974
!Ud'(iGa Maximum : 0.008997
OR+qi*) Mean : 0.000002
TjTG+uQ Standard Deviation : 0.004372
= 'o3 <} \mc0fY ,SR7DiYg Monte Carlo Analysis:
0vm> *M*p Number of trials: 20
V2Vr7v=Y" #XDgvX > Initial Statistics: Normal Distribution
CvY+b^ ; P[
:_"4U Trial Criteria Change
xR0T'@q 1 0.381931 -0.004936
u]IbTJ' 2 0.386597 -0.000269
`s
CwgY+ 3 0.380763 -0.006103
e
c&Y2 4 0.385898 -0.000968
z3+@[I$ 5 0.379542 -0.007324
S\).0goOW 6 0.386121 -0.000745
p@^G)x 7 0.388123 0.001257
XGx[Ny_A2 8 0.385172 -0.001695
q,, 9 0.386426 -0.000440
VV$t*9w 10 0.387614 0.000748
&W@2n&U.q 11 0.375242 -0.011624
QM0B6F 12 0.386008 -0.000859
d&j 13 0.388606 0.001740
,0W^"f.g{m 14 0.383519 -0.003347
^<CVQ8R7 15 0.381154 -0.005712
7Bp7d/R- 16 0.382717 -0.004149
$y8-JR~ 17 0.388328 0.001462
M/?,Qii 18 0.386187 -0.000679
1#A$&'&\J; 19 0.385583 -0.001283
}<04\t? 20 0.383495 -0.003371
2FIL@f|\7z faQmkO Nominal 0.386866
xs{pGQ6Q Best 0.388606
jzbq{# Worst 0.375242
I%3[aBz4 Mean 0.384451
Y$=jAN Std Dev 0.003324
~lw9sm*2v2 ;o9h|LRs Compensator Statistics:
Jl/w P Change in back focus:
puC91 Minimum : -0.011827
S[Du
> Maximum : 0.006609
Za:j;u
Y Mean : 0.000099
FH~:&; Standard Deviation : 0.004182
5'} V`?S xLW$>;kI 90% >= 0.379542
yaj dRU 50% >= 0.385583
`L'g<VK; 10% >= 0.388123
3_ -'&/7e6>y End of Run