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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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5oG~ Fc qg#YQ'vWte L3前面两竖线是
光阑 nIg 88*6b, C%Lr3M;S' 公差分析结果:
h_ 4*?w L/ibnGhq] Units are Millimeters.
D{JjSky yx|iZhK0:} Paraxial Focus compensation is on. In this mode, all
1=J& ^O{W compensators are ignored, except paraxial back focus change.
8B*(P> P{A})t7 WARNING: Boundary constraints on compensators are ignored when
PI*@.kqR- using fast mode or user-defined merit functions.
];w}?LFb *S*49Hq7c Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
)$S=iL8( Mode : Sensitivities
gNW+Dq|X% Sampling : 3
d?X,od6 Optimization Cycles : Automatic mode
<?B3^z$ Nominal Criteria : 0.38686619
;'{7wr|9 Test Wavelength : 0.5460
5.VPK 338A m'}`+#C%) Fields: User Defined Real Image height in Millimeters
5?$MZaT # X-Field Y-Field Weight VDX VDY VCX VCY
n8Qv8 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
)$TN%hV! 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
y]yl7g =~ 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
E&cC2(w 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
f>6{tI5X 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
eXKEx4rU 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
]+Whv%M ~NIhS! Sensitivity Analysis:
ZXs,TaU H]tD~KM< |------------ Minimum ------------| |------------ Maximum ------------|
}iKjef#J Type Value Criteria Change Value Criteria Change
t >"`rcg TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
OD~Q|I(j TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
3=n6NTL TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
0+iRgnd9? TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
"T=j\/Q TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
15jQ87) TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
T9$~tv,5F DRm`y>. Worst offenders:
0qNk.1pv Type Value Criteria Change
W<)nC_$ TTHI 10 11 -0.010000 0.375901 -0.010965
3r+c&^ TTHI 4 6 0.010000 0.378999 -0.007867
8gNTW7W/ TTHI 2 3 0.010000 0.380196 -0.006670
_0$>LWO~ TTHI 7 8 -0.010000 0.380585 -0.006282
`0ym3} (O TTHI 4 6 -0.010000 0.380717 -0.006149
Pi"?l[T0 TTHI 10 11 0.010000 0.385879 -0.000987
k9*UBx TTHI 2 3 -0.010000 0.386393 -0.000473
Zo2+{a TTHI 7 8 0.010000 0.386480 -0.000386
}+m4(lpl TTHI 12 13 0.010000 0.386709 -0.000158
9 RDs`>v TTHI 14 15 0.010000 0.386722 -0.000144
'sZGLgT;m ,Gv}N& 7NRa&W2 Estimated Performance Changes based upon Root-Sum-Square method:
W)ug%@ ) Nominal MTF : 0.3869
r1
:TM|5L Estimated change : -0.0124
kHr-UJ! Estimated MTF : 0.3745
ykbfK$jz
kkZ}&OXS; Compensator Statistics:
<VD7(j]'^ Change in back focus:
TXM/+sd Minimum : -0.008974
`r1j>F7Xb Maximum : 0.008997
<b"^\]l Mean : 0.000002
r rfJs Standard Deviation : 0.004372
Mw,]Pt6~i )T9Cv8 V/xXW= Monte Carlo Analysis:
]*zG*.C Number of trials: 20
F_:Wu,dUZ 90uXJyW;d Initial Statistics: Normal Distribution
w!<e#Z]3b E8av/O
VUd Trial Criteria Change
7ucm1 1 0.381931 -0.004936
%|x9C,0p# 2 0.386597 -0.000269
l4T[x|')M 3 0.380763 -0.006103
u:J(0re 4 0.385898 -0.000968
!+$QN4{9 5 0.379542 -0.007324
j.6!T'$| 6 0.386121 -0.000745
HgW!Q(* 7 0.388123 0.001257
??e|ec2% 8 0.385172 -0.001695
%|+aI? 9 0.386426 -0.000440
^|oI^"IQ= 10 0.387614 0.000748
@nwVl8 11 0.375242 -0.011624
'2Zs15)V 12 0.386008 -0.000859
.B xQF 13 0.388606 0.001740
~6t<`&f 14 0.383519 -0.003347
>|RoLV 15 0.381154 -0.005712
Da)p%E>Q 16 0.382717 -0.004149
0.+Eo.AX4M 17 0.388328 0.001462
&;?+ ^L> 18 0.386187 -0.000679
#QsJr_= 19 0.385583 -0.001283
xKBi".wA 20 0.383495 -0.003371
Kn$t_7AF^
5q@s6_"{ Nominal 0.386866
G)YmaHeI;[ Best 0.388606
ncadVheKt Worst 0.375242
;\}dQsX Mean 0.384451
E8PwA. Std Dev 0.003324
i{N?Y0YQs0 au19Q*r9 Compensator Statistics:
`0%;Gz%} Change in back focus:
XBX`L"0 Minimum : -0.011827
%h0BA.r Maximum : 0.006609
0J[B3JO@M Mean : 0.000099
.!^OmT,u Standard Deviation : 0.004182
Z2*?a|3 e~*tQ4 90% >= 0.379542
Ys_LGfK 50% >= 0.385583
7)}_'p 10% >= 0.388123
vK/`or3U D]fgBW- End of Run