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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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KOy{? cZh0\DyU L3前面两竖线是
光阑 !J7`frv"( #%E`~&[ 公差分析结果:
~tp]a]yV K}l3t2uk Units are Millimeters.
/whaY4__O\ ,sL'T[tuiU Paraxial Focus compensation is on. In this mode, all
59Pc:Gg; compensators are ignored, except paraxial back focus change.
DhM=q 40kAGs>_ WARNING: Boundary constraints on compensators are ignored when
z0 9Gp}^; using fast mode or user-defined merit functions.
eI1zRoIl- 64/ZfXD Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
D^[l~K Mode : Sensitivities
A 6S0dX Sampling : 3
6(8F4[D Optimization Cycles : Automatic mode
0<m7:D
Gd Nominal Criteria : 0.38686619
7h
54j Test Wavelength : 0.5460
ZsP ^< Cf[tNq Fields: User Defined Real Image height in Millimeters
q }@L "a` # X-Field Y-Field Weight VDX VDY VCX VCY
Z@Rm^g]o 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
V"#0\|]m 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
w0BphK[ 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
0>|q[SC 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
c-$rB_t+ 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
=0cTct6\ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
*?m)VvR>| ,XT,t[w Sensitivity Analysis:
JQM_96\ "|3I|#s |------------ Minimum ------------| |------------ Maximum ------------|
..`c# O& Type Value Criteria Change Value Criteria Change
B[uyr)$ TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
>#G%2Vp TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
QEJu.o TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
i-CJ{l TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
[7@blU TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
HJl?@&l/ TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
1mmL`M1 kORWj< Worst offenders:
@8W@I| Type Value Criteria Change
6Ryc&z5 TTHI 10 11 -0.010000 0.375901 -0.010965
']nIa7 TTHI 4 6 0.010000 0.378999 -0.007867
"uBnK! TTHI 2 3 0.010000 0.380196 -0.006670
s$#64"F TTHI 7 8 -0.010000 0.380585 -0.006282
J*zzjtY( 1 TTHI 4 6 -0.010000 0.380717 -0.006149
hCQOwk# TTHI 10 11 0.010000 0.385879 -0.000987
\lK?f] qJq TTHI 2 3 -0.010000 0.386393 -0.000473
85E$m'0O TTHI 7 8 0.010000 0.386480 -0.000386
:qo[@ x{ TTHI 12 13 0.010000 0.386709 -0.000158
;<FAcR TTHI 14 15 0.010000 0.386722 -0.000144
KGgtEh| {-5)nS^_ &y_t,8>5 Estimated Performance Changes based upon Root-Sum-Square method:
&;$uU Nominal MTF : 0.3869
;u2[Ww~k Estimated change : -0.0124
k4sV6f Estimated MTF : 0.3745
,l&?%H9q !td!">r46e Compensator Statistics:
0ca0-vY Change in back focus:
I$"Z\c8; Minimum : -0.008974
H>+/k-n- Maximum : 0.008997
C@qWour Mean : 0.000002
6m&GN4Ca Standard Deviation : 0.004372
Vg$d|m${ E3wpC#[Q1 >v,X:B?+FL Monte Carlo Analysis:
m'2F#{ Number of trials: 20
8O^x~[sQ Be{@ L Initial Statistics: Normal Distribution
U4d7-&U ^y>V-R/N Trial Criteria Change
C@-Hm 1 0.381931 -0.004936
Z. ${WZW 2 0.386597 -0.000269
m}yu4 3 0.380763 -0.006103
va@;V+cD 4 0.385898 -0.000968
5j`sJvq 5 0.379542 -0.007324
F>.y>h 6 0.386121 -0.000745
|co#X8J 7 0.388123 0.001257
_&=`vv' 8 0.385172 -0.001695
yD<#Q\, 9 0.386426 -0.000440
8g=O0Gb 10 0.387614 0.000748
7T[L5-g 11 0.375242 -0.011624
T]0K4dp+ 12 0.386008 -0.000859
4b}p[9k 13 0.388606 0.001740
#s~ITG#H 14 0.383519 -0.003347
KLe6V+ki* 15 0.381154 -0.005712
z_(l]Ern} 16 0.382717 -0.004149
C 9%bD 17 0.388328 0.001462
TD\TVK3P 18 0.386187 -0.000679
i<S\x 19 0.385583 -0.001283
pKLcg"{[F 20 0.383495 -0.003371
ta&z lZt UW":&`i Nominal 0.386866
(B` NnL$ Best 0.388606
NL.3qx Worst 0.375242
_U}|Le@ e Mean 0.384451
:/6:&7s Std Dev 0.003324
=F[M>o og$dv
23 Compensator Statistics:
uhq6dhhR Change in back focus:
0084`&Ki Minimum : -0.011827
f.ua,,P. Maximum : 0.006609
/;_$:`|/ Mean : 0.000099
0of:tZU Standard Deviation : 0.004182
UVXruH 70avr)OM 90% >= 0.379542
pYCMJK-H 50% >= 0.385583
a/E(GQ,, 10% >= 0.388123
="T}mc ?o V.SG' End of Run