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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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m"iA#3l*= sjg`4^!wDD L3前面两竖线是
光阑 ujX;wGje _Ns EeKU 公差分析结果:
jRS{7rx%MH T+F]hv' Units are Millimeters.
vyIH<@@p7 2+
cs^M3 Paraxial Focus compensation is on. In this mode, all
wgS,U}/i compensators are ignored, except paraxial back focus change.
mOsp~|d MxIa,M< WARNING: Boundary constraints on compensators are ignored when
5FoZ$I using fast mode or user-defined merit functions.
F+V!p4G VWvSt C Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
d}[cX9U/ Mode : Sensitivities
-SrZ^ Sampling : 3
;mG*Rad Optimization Cycles : Automatic mode
rR> X< Nominal Criteria : 0.38686619
3c=kYcj Test Wavelength : 0.5460
E5bVCAz }|kFHodo Fields: User Defined Real Image height in Millimeters
l?U=s7s0? # X-Field Y-Field Weight VDX VDY VCX VCY
AAevN3a#nI 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
;/j2(O^ 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
\g39>;iR 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
<h7cQ 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
[X.bR$> 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
K
-U}sW 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
E^axLp>(I J~k9jeq9 Sensitivity Analysis:
@Nek;xJ <OMwi9 |------------ Minimum ------------| |------------ Maximum ------------|
<W"W13*j! Type Value Criteria Change Value Criteria Change
lir=0oq< TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
^Co$X+
TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
;Y?MbD TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
9{toPED TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
U#` e~d t< TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
'dLw8&T+W TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
;.A}c)b s<9g3Gh Worst offenders:
Qd[_W^QI Type Value Criteria Change
9r!8BjA TTHI 10 11 -0.010000 0.375901 -0.010965
|1U_5w TTHI 4 6 0.010000 0.378999 -0.007867
zfeT>S+ TTHI 2 3 0.010000 0.380196 -0.006670
{{?g%mQ6 TTHI 7 8 -0.010000 0.380585 -0.006282
FlBhCZ|^ TTHI 4 6 -0.010000 0.380717 -0.006149
[0 F~e TTHI 10 11 0.010000 0.385879 -0.000987
;A*SuFbV TTHI 2 3 -0.010000 0.386393 -0.000473
)>iOj50n3 TTHI 7 8 0.010000 0.386480 -0.000386
/T w{JO#Q TTHI 12 13 0.010000 0.386709 -0.000158
v`HER6 TTHI 14 15 0.010000 0.386722 -0.000144
HZyA\FS ,QY$:f< JE?rp1. Estimated Performance Changes based upon Root-Sum-Square method:
=RQF::[h Nominal MTF : 0.3869
Y2u\~.;oq Estimated change : -0.0124
k?+ 7%A] Estimated MTF : 0.3745
R6+)&:Ab{R Aqyw Compensator Statistics:
j/O~8o& Change in back focus:
:GXF=Df Minimum : -0.008974
=@HS Maximum : 0.008997
^3;B4tj[ Mean : 0.000002
6Y9N=\` Standard Deviation : 0.004372
UVo`jb|>
o 5R7x%3@L yqT !A Monte Carlo Analysis:
V(MYReaPC] Number of trials: 20
IiU> VLa 7' G;ijx Initial Statistics: Normal Distribution
8tj]@GE
qX\*lm/l Trial Criteria Change
0a~t 1 0.381931 -0.004936
jm}CrqU 2 0.386597 -0.000269
)4yP(6|lx 3 0.380763 -0.006103
)PX VR
T 4 0.385898 -0.000968
&."$kfA+ 5 0.379542 -0.007324
GWA"!~Hu 6 0.386121 -0.000745
ma.84~m 7 0.388123 0.001257
6_CP?X+T 8 0.385172 -0.001695
!GcBNQ1p+7 9 0.386426 -0.000440
8Zr;n`~ 10 0.387614 0.000748
&@0~]\,D7 11 0.375242 -0.011624
"r9Rr_,
> 12 0.386008 -0.000859
82r8K|L.<y 13 0.388606 0.001740
F9K%f&0 a 14 0.383519 -0.003347
M<vPE4TIr* 15 0.381154 -0.005712
1Cr&6 't 16 0.382717 -0.004149
po| Ux`u 17 0.388328 0.001462
K d&/9<{> 18 0.386187 -0.000679
+jm,nM9 19 0.385583 -0.001283
0dchOUj 20 0.383495 -0.003371
Y|>dS8f;4 l/.{F ;3F Nominal 0.386866
1[FN: hm Best 0.388606
-ss= c # Worst 0.375242
akj<*, Mean 0.384451
zF1!a Std Dev 0.003324
ci0A!wWD kK6OZhLH Compensator Statistics:
G@]3EP Change in back focus:
slQn Minimum : -0.011827
H>~ CL Maximum : 0.006609
@\K[WqF$$q Mean : 0.000099
YF%gs{ Standard Deviation : 0.004182
Qb536RpcTY &7L7|{18 90% >= 0.379542
CIudtY(: 50% >= 0.385583
UP~28%>X 10% >= 0.388123
/bo}I-<2 h4Crq Yxa_ End of Run