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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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)OQm,5F1 f1SKOq L3前面两竖线是
光阑 _s#J\!F AUF[hzA 公差分析结果:
%6lGRq{/? 'g<{l&u Units are Millimeters.
vh2/d.MO uu]C;wl Paraxial Focus compensation is on. In this mode, all
nl2Lqu1 compensators are ignored, except paraxial back focus change.
!Usmm8!K Q3+%8zZI WARNING: Boundary constraints on compensators are ignored when
.mrv"k\< using fast mode or user-defined merit functions.
$ H@
@)Vb?|3 Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
$U ._4 Mode : Sensitivities
2IHS)kkT| Sampling : 3
_\dC<K *> Optimization Cycles : Automatic mode
[%LGiCU] Nominal Criteria : 0.38686619
F',1R"/} Test Wavelength : 0.5460
cyd_xB5K P)y2'JKL Fields: User Defined Real Image height in Millimeters
s3ASA.* # X-Field Y-Field Weight VDX VDY VCX VCY
>9nVR 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
]D@aMC$# 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
9BOn8p;yz 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
`TF3Ho\MC 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
\0}bOHqEH 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
Ro$*bN6p 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
3k6Dbz <au_ S\n Sensitivity Analysis:
C4X3;l Z%S %eHr^j~w$ |------------ Minimum ------------| |------------ Maximum ------------|
r!{i2I| Type Value Criteria Change Value Criteria Change
dXn$XGF%R TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
v^/<2/E"?4 TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
K7x;/O TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
nmL|v TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
\A!Iln TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
6U|"d[ TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
l8Yr]oNkz S~z$=IiB Worst offenders:
A0.xPru1p Type Value Criteria Change
#Sy~t{4 TTHI 10 11 -0.010000 0.375901 -0.010965
xV`)?hEXFh TTHI 4 6 0.010000 0.378999 -0.007867
"{S4YA TTHI 2 3 0.010000 0.380196 -0.006670
'q/C: Yo TTHI 7 8 -0.010000 0.380585 -0.006282
b+AxTe(" TTHI 4 6 -0.010000 0.380717 -0.006149
N-}OmcO]e TTHI 10 11 0.010000 0.385879 -0.000987
=<M>fJ) TTHI 2 3 -0.010000 0.386393 -0.000473
rmX5-k TTHI 7 8 0.010000 0.386480 -0.000386
[r]<~$ TTHI 12 13 0.010000 0.386709 -0.000158
+=L+35M TTHI 14 15 0.010000 0.386722 -0.000144
#"C*dNAB jtpk5 fJB kiin7 8W Estimated Performance Changes based upon Root-Sum-Square method:
$WE_aNfja Nominal MTF : 0.3869
V~.SgbLc Estimated change : -0.0124
2l+'p[b0> Estimated MTF : 0.3745
3uvl'1(%J Pa; *%7 Compensator Statistics:
w3fD6$ Change in back focus:
(/>
yfL]J Minimum : -0.008974
sSiZG Maximum : 0.008997
P4MP`A Mean : 0.000002
guy!/zQ>A Standard Deviation : 0.004372
EO",|V- '/ueY#eG %74f6\ Monte Carlo Analysis:
Ex}TDmTu Number of trials: 20
FNl^ lj`Y "tK3h3/Xv Initial Statistics: Normal Distribution
u7p:6W bx" .<q ( Trial Criteria Change
3U?^49bJ 1 0.381931 -0.004936
-42 U 2 0.386597 -0.000269
O1]XoUH< 3 0.380763 -0.006103
Oh}@c~7; 4 0.385898 -0.000968
M9yqJPS}B 5 0.379542 -0.007324
Z\?!&& 6 0.386121 -0.000745
dt>!=<|k 7 0.388123 0.001257
wDh&S{N 8 0.385172 -0.001695
3fop.%( 9 0.386426 -0.000440
pAEJ=Te 10 0.387614 0.000748
lnxA/[`a 11 0.375242 -0.011624
;ZrFy=Iv 12 0.386008 -0.000859
.R^]<b:` 13 0.388606 0.001740
[9p@uRE 14 0.383519 -0.003347
P_@ty~u 15 0.381154 -0.005712
@6b;sv1W 16 0.382717 -0.004149
8,m: 17 0.388328 0.001462
?H!X
p 18 0.386187 -0.000679
Ga* 19 0.385583 -0.001283
LGCeYXic 20 0.383495 -0.003371
NL ceBok cja-MljD Nominal 0.386866
Rn whkb&& Best 0.388606
wi:d!,P`e Worst 0.375242
g{7?#.7 Mean 0.384451
C2%Yr y Std Dev 0.003324
A<g5:\3 JnH5v(/ Compensator Statistics:
IZ_ B $mo Change in back focus:
h"N#/zQ Minimum : -0.011827
dnX^ ? Maximum : 0.006609
gm&O-N"=U Mean : 0.000099
t`4o&vsj= Standard Deviation : 0.004182
]"1\z>Hg [
**F 90% >= 0.379542
yj`xOncE} 50% >= 0.385583
0k|/]zfb 10% >= 0.388123
CwfGp[|}e gem+$TFq End of Run