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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 G&0JK ,Y hA"z0Fszh 公差分析结果:
KR4 RIJZ_t gD6BPW~0 Units are Millimeters.
G{|FV
m 'BEM:1) Paraxial Focus compensation is on. In this mode, all
(]<G)+* compensators are ignored, except paraxial back focus change.
sWLH"'Z <{1 3Nd'o WARNING: Boundary constraints on compensators are ignored when
pC)S9Kl using fast mode or user-defined merit functions.
gJZ9XLPC FkoN+\d Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
vnz}Pr! c Mode : Sensitivities
v[?eL0Z Sampling : 3
B;L^!sLP
Optimization Cycles : Automatic mode
Aa%ks+1 Nominal Criteria : 0.38686619
=G<S!qW Test Wavelength : 0.5460
\V<deMb= W&a<Q)o*I Fields: User Defined Real Image height in Millimeters
zhde1JE # X-Field Y-Field Weight VDX VDY VCX VCY
}*0*8~Q'5 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
9hs7B!3pc> 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
7Rom#Kl: 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
~E7=c3:" 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
K fNR)
5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
+f?xVW<h 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
wsfn>w?!V j,JGs[A Sensitivity Analysis:
,b8B)VZ? j6$_U@)%O |------------ Minimum ------------| |------------ Maximum ------------|
IqONDdep9 Type Value Criteria Change Value Criteria Change
,t>/_pI+= TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
FY]z*= TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
nbz?D_ TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
;;- I<TL TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
L~(`zO3f TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
.:s**UiDR TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
re}P *gzX=*;x+? Worst offenders:
l4Y}<j\; Type Value Criteria Change
%7rWebd- TTHI 10 11 -0.010000 0.375901 -0.010965
b$ )XS TTHI 4 6 0.010000 0.378999 -0.007867
^?tF'l` TTHI 2 3 0.010000 0.380196 -0.006670
e c`3Qw TTHI 7 8 -0.010000 0.380585 -0.006282
E>?T<!r~j TTHI 4 6 -0.010000 0.380717 -0.006149
xpVYNS{c+| TTHI 10 11 0.010000 0.385879 -0.000987
enT.9|vm/ TTHI 2 3 -0.010000 0.386393 -0.000473
tpi63<N TTHI 7 8 0.010000 0.386480 -0.000386
f8
M=P.jz TTHI 12 13 0.010000 0.386709 -0.000158
bKH8/*Yk TTHI 14 15 0.010000 0.386722 -0.000144
_nj?au(@`Y C"ZCX6p+$ N8l(m5Kk,k Estimated Performance Changes based upon Root-Sum-Square method:
Lw.N3!e[ Nominal MTF : 0.3869
fXYg % Estimated change : -0.0124
yeNC-U< Estimated MTF : 0.3745
-3c?Yaf" l4d2i;4BK Compensator Statistics:
iwfv t^ Change in back focus:
2$? )VXtw Minimum : -0.008974
U;4:F{3m
Maximum : 0.008997
hQgi--Msw' Mean : 0.000002
pOip$Z Standard Deviation : 0.004372
'?k*wEu ~z!U/QR2 Piz/vH6M} Monte Carlo Analysis:
d&0^AvM@ Number of trials: 20
&`63"^y A_@#V)D2 Initial Statistics: Normal Distribution
p_QL{gn '5eW"HGU]` Trial Criteria Change
{j
E}mzi 1 0.381931 -0.004936
mOyBSOad4 2 0.386597 -0.000269
p9 |r y+t 3 0.380763 -0.006103
([ xYOxcp5 4 0.385898 -0.000968
` oYrW0Vm 5 0.379542 -0.007324
nMXSpX>!| 6 0.386121 -0.000745
6?ylSQ]1 7 0.388123 0.001257
pUr.<yc&u 8 0.385172 -0.001695
%c(':vI# 9 0.386426 -0.000440
b07 MTDFH7 10 0.387614 0.000748
qgU$0enSs 11 0.375242 -0.011624
-`B|$ W 12 0.386008 -0.000859
)fR'1_ 13 0.388606 0.001740
>9|/sH@W 14 0.383519 -0.003347
@QMMtfeLj 15 0.381154 -0.005712
x5 3aGi| 16 0.382717 -0.004149
z.pP~he 17 0.388328 0.001462
\?)<==^ 18 0.386187 -0.000679
[HK[{M=v= 19 0.385583 -0.001283
;e_n7>'#% 20 0.383495 -0.003371
h 5ST`jZ BxO8oKe Nominal 0.386866
hHdH#-O:4" Best 0.388606
'zZN]P Worst 0.375242
#tdI;x3 Mean 0.384451
i}+K;,Da:8 Std Dev 0.003324
H{`S/>)[ <`a!%_LC
[ Compensator Statistics:
grnlJ= Change in back focus:
$ T.c>13 Minimum : -0.011827
$GYcZN& Maximum : 0.006609
N'!a{rF Mean : 0.000099
-}{c;pT Standard Deviation : 0.004182
_bn*B$ {(AYs*5 90% >= 0.379542
u-At k-2M 50% >= 0.385583
Y_)!U`>N? 10% >= 0.388123
k 0z2)3L !,PG!Gnl End of Run