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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。
kaoiSL<[6 ?|_i"*]l l+wfP76w lu+KfKa L3前面两竖线是
光阑 7+KI9u}- 9;9ge 公差分析结果:
;bHS^ {61Y; Units are Millimeters.
=HV${+K=~ %h,&N D Paraxial Focus compensation is on. In this mode, all
f`}/^*D compensators are ignored, except paraxial back focus change.
Zz QLbCV xTH3g^E WARNING: Boundary constraints on compensators are ignored when
K W
ZEi? using fast mode or user-defined merit functions.
e^x%d[sU W1LR ,:$ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
d0Ubt Mode : Sensitivities
+7AH|v8 Sampling : 3
([^f1;ncm Optimization Cycles : Automatic mode
@CxgoX^ Nominal Criteria : 0.38686619
QctzIC#;k Test Wavelength : 0.5460
#,1)@[ D6fd(=t1Z Fields: User Defined Real Image height in Millimeters
*(5T?p[7 # X-Field Y-Field Weight VDX VDY VCX VCY
2}*8( 32 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
\P"Ol\@ 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
-0]%#(E%`h 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
&m\Uc 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
h qhX 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
u]`0QxvZ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
%BT]h3dcSS C(z'oi:f Sensitivity Analysis:
;R<V-gab gq4X(rsyD |------------ Minimum ------------| |------------ Maximum ------------|
8A::q ; Type Value Criteria Change Value Criteria Change
>Y+m54EE TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
,Jn` qvmi TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
p=kt+H&; TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
F~7TE91C TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
3J/l>1[ TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
GZn=Hgv8 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
<$a-.C5 Y7I\<JG< Worst offenders:
}s6Veosl Type Value Criteria Change
-yBj7F| TTHI 10 11 -0.010000 0.375901 -0.010965
iE_[]Vgc TTHI 4 6 0.010000 0.378999 -0.007867
Zu>-y#Bw TTHI 2 3 0.010000 0.380196 -0.006670
pp7
$Q>6 TTHI 7 8 -0.010000 0.380585 -0.006282
R9"}-A TTHI 4 6 -0.010000 0.380717 -0.006149
I36%oA TTHI 10 11 0.010000 0.385879 -0.000987
&"27U TTHI 2 3 -0.010000 0.386393 -0.000473
_% \% TTHI 7 8 0.010000 0.386480 -0.000386
.Y8P6_ TTHI 12 13 0.010000 0.386709 -0.000158
hsYE&Np_Q TTHI 14 15 0.010000 0.386722 -0.000144
c9c3o{(6Y bGy|T*@ 0_Elxc Estimated Performance Changes based upon Root-Sum-Square method:
Qgv g*KX Nominal MTF : 0.3869
0 VG;z#{J Estimated change : -0.0124
B%kC>J Estimated MTF : 0.3745
Ai^0{kF6 /& c2y=/'C Compensator Statistics:
guf*>qNr Change in back focus:
\i}-Y[Dg Minimum : -0.008974
D@ !r?E` Maximum : 0.008997
gX(Xj@=(& Mean : 0.000002
T/ eX7p1 Standard Deviation : 0.004372
vifw
FPe )54a' Hp )`ixT) Monte Carlo Analysis:
X%N!gy Number of trials: 20
:O,r3O6 ![fNlG!r Initial Statistics: Normal Distribution
U}k@%m, ~Eb:AC5 Trial Criteria Change
Zs-lN*u7. 1 0.381931 -0.004936
| WTWj 2 0.386597 -0.000269
P>_9>k@;Q 3 0.380763 -0.006103
("}C& 6)cB 4 0.385898 -0.000968
B*Om\I 5 0.379542 -0.007324
".N{v1 6 0.386121 -0.000745
V}7)>i$A 7 0.388123 0.001257
v&d'ABeT 8 0.385172 -0.001695
R?/xH=u> 9 0.386426 -0.000440
h| `R[ 10 0.387614 0.000748
[u^ fy<jdp 11 0.375242 -0.011624
ka ;=%*7T 12 0.386008 -0.000859
A"s?;hv\fS 13 0.388606 0.001740
ur=:Ha 14 0.383519 -0.003347
4`fV_H.8 15 0.381154 -0.005712
@uN+]e+3 16 0.382717 -0.004149
_8F;-7Sz 17 0.388328 0.001462
F< 5kcu#iL 18 0.386187 -0.000679
jvD_{r 19 0.385583 -0.001283
) j&khHD 20 0.383495 -0.003371
*QIYq v6[VdWOx5 Nominal 0.386866
s,!vBSn8 Best 0.388606
ST~YO Worst 0.375242
?z6K/'? Mean 0.384451
KIR3m
) Std Dev 0.003324
@g+v2(f2v 6A|XB3 Compensator Statistics:
SDNRcSbOD6 Change in back focus:
@]8flb
)T Minimum : -0.011827
`
"-P g5 Maximum : 0.006609
>9i>A: Mean : 0.000099
f&$;iE Standard Deviation : 0.004182
&(l.jgqg& \*qradgx$ 90% >= 0.379542
}Qe(6'l_ 50% >= 0.385583
$sg- P|Wo 10% >= 0.388123
d#$Pf=} e6tU8`z End of Run