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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。
Cb=r 8C ;T#t)oV -B4uK ~(aq3ngo. L3前面两竖线是
光阑 ?[RG8,B ^+`vh0TPQ 公差分析结果:
?jqZeO#W7 32~Tf, Units are Millimeters.
W U<#_by
g X&wK< Paraxial Focus compensation is on. In this mode, all
+ W@r p# compensators are ignored, except paraxial back focus change.
~|DF-t
V V]q{N-Iq WARNING: Boundary constraints on compensators are ignored when
?b#?Vz using fast mode or user-defined merit functions.
QMtt:f]?i ATnD~iACY Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
]2h[.qa Mode : Sensitivities
,<EmuEw | Sampling : 3
d[~c-G6 Optimization Cycles : Automatic mode
J3:P/n& Nominal Criteria : 0.38686619
am%qlN< Test Wavelength : 0.5460
g,,cV+ \W= Fields: User Defined Real Image height in Millimeters
1'aS2vB9 # X-Field Y-Field Weight VDX VDY VCX VCY
M<ad>M 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
2CmeO&(Qf* 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
;Ly4Z*!2 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
bzJKoxU 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
uFok'3!g7% 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
MO _9Yi 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
AP@xZ%;K @%#(Hse Sensitivity Analysis:
,7j`5iq[m 50I6:=@\\ |------------ Minimum ------------| |------------ Maximum ------------|
>p<(CVX[ Type Value Criteria Change Value Criteria Change
PA,j;{,(b TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
_eO] awsA TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
M
j5C0P( TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
ED?s[K TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
|HG%o
3E] TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
e<p$Op TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
I?fE=2}9 [;?^DAnK2 Worst offenders:
Yt#($}p Type Value Criteria Change
i44:VR| TTHI 10 11 -0.010000 0.375901 -0.010965
>#q|Pjv] TTHI 4 6 0.010000 0.378999 -0.007867
9723f1&Vd TTHI 2 3 0.010000 0.380196 -0.006670
,7QnZ=F TTHI 7 8 -0.010000 0.380585 -0.006282
BMdr.0 TTHI 4 6 -0.010000 0.380717 -0.006149
;zCHEz TTHI 10 11 0.010000 0.385879 -0.000987
"q(&<+D@ TTHI 2 3 -0.010000 0.386393 -0.000473
^-ACtA) TTHI 7 8 0.010000 0.386480 -0.000386
.1pEq~> TTHI 12 13 0.010000 0.386709 -0.000158
TWs|lhC7! TTHI 14 15 0.010000 0.386722 -0.000144
*,Re&N8 hCDI;'ls VLO>{"{' Estimated Performance Changes based upon Root-Sum-Square method:
;=7z!:) Nominal MTF : 0.3869
<pE G8_{} Estimated change : -0.0124
G`
8j ^H, Estimated MTF : 0.3745
Gg!))I+ h)<R#xw Compensator Statistics:
JJ+<?CeHD Change in back focus:
9:Y:Vx Minimum : -0.008974
iM956 3v Maximum : 0.008997
(8*lLZ Mean : 0.000002
^s?wnEo;j Standard Deviation : 0.004372
ko:I.6- K */\.-L{h :J~j*_hZ Monte Carlo Analysis:
:D,YR(]) Number of trials: 20
iY($O/G[+ UP`q6]P Initial Statistics: Normal Distribution
;+jp,( 7 q-RGplx Trial Criteria Change
%*gO<U4L] 1 0.381931 -0.004936
#<~f~{x 2 0.386597 -0.000269
XMdc n, 3 0.380763 -0.006103
|u+&xX7 4 0.385898 -0.000968
OMZT\$9yT 5 0.379542 -0.007324
j~8+,: 6 0.386121 -0.000745
L,ra=SV F 7 0.388123 0.001257
};j&)M 8 0.385172 -0.001695
Z\L@5.*ydE 9 0.386426 -0.000440
Z-<u?f8{* 10 0.387614 0.000748
jgstx3 11 0.375242 -0.011624
j"V$J8)[ 12 0.386008 -0.000859
D=\|teA& 13 0.388606 0.001740
K$
&wO. 14 0.383519 -0.003347
c]]F`B 15 0.381154 -0.005712
;FmSL#]I 16 0.382717 -0.004149
Cb6MD 17 0.388328 0.001462
VZ,T`8" 18 0.386187 -0.000679
w|HZI,~ 19 0.385583 -0.001283
W<4\4 20 0.383495 -0.003371
v<SEGv- @(
t:E`8 Nominal 0.386866
G4}q*&:k Best 0.388606
}*'ha=`J Worst 0.375242
| rvr Sab) Mean 0.384451
LnDj Std Dev 0.003324
]Rye AJ3 ^55?VQB Compensator Statistics:
/kz&9FM Change in back focus:
m\f_u* Minimum : -0.011827
A|J\X=5 Maximum : 0.006609
OeYLL4H Mean : 0.000099
{X$Mwqhpp; Standard Deviation : 0.004182
/4?`F}7) Q7r,5w&cm 90% >= 0.379542
FT;JYkO 50% >= 0.385583
b8>9mKs 10% >= 0.388123
%Let AR 3~Ln:4[6ID End of Run