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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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*]| ^Zp 公差分析结果:
FrUqfTi+W "G-h8IN^O Units are Millimeters.
0WfnX>(C7R E]8uj8K3] Paraxial Focus compensation is on. In this mode, all
MRw4?HqB compensators are ignored, except paraxial back focus change.
eX>*}pI SSxz1y WARNING: Boundary constraints on compensators are ignored when
$.t>* Bq using fast mode or user-defined merit functions.
*7-rm REgM Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
vBJxhK- Mode : Sensitivities
%.D!J",\/K Sampling : 3
o<iU;15 Optimization Cycles : Automatic mode
\m~p;B Nominal Criteria : 0.38686619
:8j7}' Test Wavelength : 0.5460
L&y"oAp< gwsIzYV Fields: User Defined Real Image height in Millimeters
ZjMnGRP # X-Field Y-Field Weight VDX VDY VCX VCY
a|=^ 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
dWQB1Y*N 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
P[-do 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
MoQ\~/Z| 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
52 Qr 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
!4cY^4>o 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
oPF]]Imu jDqG9] Sensitivity Analysis:
,~&HL7v 7)Vbp--b# |------------ Minimum ------------| |------------ Maximum ------------|
Z\U r F0 Type Value Criteria Change Value Criteria Change
x{8h3.ZQ, TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
i9De+3VqKK TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
Z~QLjv&$/r TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
+&S6se4 TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
;Vc|3 TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
uDXV@;6< TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
4bp})>}jB \lm]G7h Worst offenders:
H8[A*uYL
Type Value Criteria Change
4oH ,_sr TTHI 10 11 -0.010000 0.375901 -0.010965
})P!7t TTHI 4 6 0.010000 0.378999 -0.007867
[`qdpzUp& TTHI 2 3 0.010000 0.380196 -0.006670
ppNMXbXR TTHI 7 8 -0.010000 0.380585 -0.006282
Eyjsbj8 TTHI 4 6 -0.010000 0.380717 -0.006149
TwI s_r: TTHI 10 11 0.010000 0.385879 -0.000987
K)wWqC. TTHI 2 3 -0.010000 0.386393 -0.000473
T]Ai{@i TTHI 7 8 0.010000 0.386480 -0.000386
i>,AnkI& TTHI 12 13 0.010000 0.386709 -0.000158
2nC,1%kxhq TTHI 14 15 0.010000 0.386722 -0.000144
r~h# Xpn\TD<_I ^d{5GK' Estimated Performance Changes based upon Root-Sum-Square method:
M /v@C*c Nominal MTF : 0.3869
$C5*@`GM$ Estimated change : -0.0124
V`#2jDz Estimated MTF : 0.3745
o h\$u5 L;$>SLl, Compensator Statistics:
viUJ4Pn Change in back focus:
dH;2OWM Minimum : -0.008974
uOeal^uS Maximum : 0.008997
wB[f%mHs
Mean : 0.000002
0V>HoH Standard Deviation : 0.004372
znTi_S ?YS>_MN +llb{~ZN Monte Carlo Analysis:
ls:oC},p* Number of trials: 20
} v:YSG m<-!~ ew Initial Statistics: Normal Distribution
2O[sRm) ty.$H24 Trial Criteria Change
\q1tT!] 1 0.381931 -0.004936
MkoK(m{7 2 0.386597 -0.000269
O_a^|ln& 3 0.380763 -0.006103
WIf.;B)L 4 0.385898 -0.000968
2<I=xWwFA 5 0.379542 -0.007324
]&]DFY~n 6 0.386121 -0.000745
:tU^ 7 0.388123 0.001257
lMGO4U[z 8 0.385172 -0.001695
Fy Ih\ 9 0.386426 -0.000440
0t^FM<7G 10 0.387614 0.000748
r5S/lp+Y+N 11 0.375242 -0.011624
94ruQ/ 12 0.386008 -0.000859
4/`;(*]Fv 13 0.388606 0.001740
O8$~dzf,2 14 0.383519 -0.003347
m
=b7
r 15 0.381154 -0.005712
G]f|? 16 0.382717 -0.004149
Mc asnjC 17 0.388328 0.001462
.6C/,rQ?c 18 0.386187 -0.000679
+`k30-<P 19 0.385583 -0.001283
ftxL-7y% 20 0.383495 -0.003371
,.QJS6Yv &=kv69v Nominal 0.386866
F6[F~^9D Best 0.388606
<z,)4z++ Worst 0.375242
oc( '!c Mean 0.384451
dz([GP'-* Std Dev 0.003324
Dc-K08c } jJKE Compensator Statistics:
:IS?si5| Change in back focus:
b+|Jw\k Minimum : -0.011827
;F"!$Z/ Maximum : 0.006609
Fk/I
(Q Mean : 0.000099
Ldz]FB| Standard Deviation : 0.004182
B-C$>H^ ]64}Xob87_ 90% >= 0.379542
a(A~S u97 50% >= 0.385583
XY'8oU`]{ 10% >= 0.388123
?`U_|Yo UGO;5! End of Run