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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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dS Tyx#o _~umE/tz L3前面两竖线是
光阑 :6(@P1vA 6 )J+OyR= 公差分析结果:
.X.6<@$ }C["'tLX Units are Millimeters.
}z9v*C hRB?NM Paraxial Focus compensation is on. In this mode, all
O+<+yQl compensators are ignored, except paraxial back focus change.
{=&({ cS r.Z g<T WARNING: Boundary constraints on compensators are ignored when
Pq{p\Qkj using fast mode or user-defined merit functions.
vy={ziJ ]D,_<Kk Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
PMbq5 Mode : Sensitivities
(igB'S5wf Sampling : 3
y.8nzlkE{ Optimization Cycles : Automatic mode
Tu}EAr Nominal Criteria : 0.38686619
/f oI.S Test Wavelength : 0.5460
jVoD9H
F/ >P} XCAU Fields: User Defined Real Image height in Millimeters
y|0/;SjV # X-Field Y-Field Weight VDX VDY VCX VCY
^ )!eiM 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
1.8"N&s 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
w<]-~`K 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
_p9"MU&} 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
o F_{oV' 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
H)&iFq 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
j5/|1N %2\Pe 2Z Sensitivity Analysis:
#v~dhx=R Ii/{xVMD |------------ Minimum ------------| |------------ Maximum ------------|
<rui\/4NJ Type Value Criteria Change Value Criteria Change
cZoj|=3a TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
=;I+:K TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
't*]6^ TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
ve.P{;;Ky TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
~5Mj:{B TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
MwQt/Qv= TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
glROT@ }F9#3W&`c Worst offenders:
cCx{
") Type Value Criteria Change
_.]mES| TTHI 10 11 -0.010000 0.375901 -0.010965
{wz_ngQ TTHI 4 6 0.010000 0.378999 -0.007867
s!MD8ia TTHI 2 3 0.010000 0.380196 -0.006670
B *6ncj TTHI 7 8 -0.010000 0.380585 -0.006282
{
JDD"z TTHI 4 6 -0.010000 0.380717 -0.006149
?X\.O-=4X TTHI 10 11 0.010000 0.385879 -0.000987
r>*+d|c4 TTHI 2 3 -0.010000 0.386393 -0.000473
y[AB,Dd TTHI 7 8 0.010000 0.386480 -0.000386
/e|qyWs TTHI 12 13 0.010000 0.386709 -0.000158
B` +,
8 TTHI 14 15 0.010000 0.386722 -0.000144
G7-k ,P^ RDy&i V=1zk-XC Estimated Performance Changes based upon Root-Sum-Square method:
xA-?pLt"G Nominal MTF : 0.3869
2_M+o]Z^ Estimated change : -0.0124
g$hEVT Estimated MTF : 0.3745
+7_U(|gO <|82)hO Compensator Statistics:
cQBc6eAi Change in back focus:
ouFKqRs; Minimum : -0.008974
^f"|<r Maximum : 0.008997
Q uw|KL Mean : 0.000002
k:@N6K/$P^ Standard Deviation : 0.004372
6zNWDUf O?A% E
GZiWBr Monte Carlo Analysis:
gLZJQubz
6 Number of trials: 20
vo&h6'i>7 >w.%KVBJ Initial Statistics: Normal Distribution
,Sy&?t}` e0Gs|c+6 Trial Criteria Change
!su773vo 1 0.381931 -0.004936
OZ"76|H1` 2 0.386597 -0.000269
yA_ly < 3 0.380763 -0.006103
`GCK%evLG 4 0.385898 -0.000968
jWh)bsqI! 5 0.379542 -0.007324
Zp<#( OIu 6 0.386121 -0.000745
X*5N&AJ 7 0.388123 0.001257
f4+wP/n& 8 0.385172 -0.001695
W_3BL]^= 9 0.386426 -0.000440
)<_qTd0` 10 0.387614 0.000748
eU e, P 11 0.375242 -0.011624
W5:fY>7 12 0.386008 -0.000859
O2="'w'kR 13 0.388606 0.001740
DvOvtd 14 0.383519 -0.003347
=9^}>u 15 0.381154 -0.005712
8xhx*A 16 0.382717 -0.004149
bs16G3-p 17 0.388328 0.001462
EdSUBoWF} 18 0.386187 -0.000679
j*4:4B% 19 0.385583 -0.001283
G8/q&6f_ 20 0.383495 -0.003371
ssoE ,6kS 5a)$:oO! Nominal 0.386866
BD86t[${W Best 0.388606
u!F\`Gfm_ Worst 0.375242
ji.?bKqHE Mean 0.384451
"*W# z Std Dev 0.003324
owVks-/ oj)(.X<8N Compensator Statistics:
7^LCP* Change in back focus:
Z'}%Mkm`i} Minimum : -0.011827
h.l.da1# Maximum : 0.006609
w1VYU> Mean : 0.000099
D. x8=|; Standard Deviation : 0.004182
?cKTeGrS 9$C?)XKXB 90% >= 0.379542
EYCZuJxv 50% >= 0.385583
0G33hIOS 10% >= 0.388123
R osU~OK VEn3b End of Run