学习
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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光阑 PRLV1o1# XVLuhw i 公差分析结果：
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,b$8 ,G:4H%? Units are Millimeters.
XH2 SE eh @uE=)mP@ Paraxial Focus compensation is on. In this mode, all
nn
compensators are ignored, except paraxial back focus change.
2(rZ@W l %zD-gw> WARNING: Boundary constraints on compensators are ignored when
m Zh VpIUO using fast mode or user-defined merit functions.
q7]WR(e 'H'+6 Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
{x4[Bx1 Mode : Sensitivities
Q)@1:(V/ Sampling : 3
B5cyX*! ? Optimization Cycles : Automatic mode
|)4$\<d Nominal Criteria : 0.38686619
8k1 r|s@d Test Wavelength : 0.5460
"^ = [*i A{J 1 n Fields: User Defined Real Image height in Millimeters
vedMzef[@> # X-Field Y-Field Weight VDX VDY VCX VCY
(XwLKkw0n 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
Z+dR(9otH3 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
tZYI{ m{ 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
`p{ !5 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
&0eB@8{N 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
/2cI{]B 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
!bcbzg2d& &+j^{a Sensitivity Analysis:
} E# +7a 9aU:[]w |------------ Minimum ------------| |------------ Maximum ------------|
._&lG3' Type Value Criteria Change Value Criteria Change
tN{t-xUgk TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
^0|NmMJ] TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
`I>K? TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
B
R:
TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
N39nJqo>" TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
,4Fq vg TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
P\mm8s`f W^ :/0WR Worst offenders:
oyt //SE Type Value Criteria Change
a-E-hX2 TTHI 10 11 -0.010000 0.375901 -0.010965
!:<UgbiVv TTHI 4 6 0.010000 0.378999 -0.007867
V qL
5f TTHI 2 3 0.010000 0.380196 -0.006670
W|#ev*'F TTHI 7 8 -0.010000 0.380585 -0.006282
|{PJT#W% TTHI 4 6 -0.010000 0.380717 -0.006149
4LEE
/ TTHI 10 11 0.010000 0.385879 -0.000987
?66(t TTHI 2 3 -0.010000 0.386393 -0.000473
icul15'i TTHI 7 8 0.010000 0.386480 -0.000386
)h0 E$ * TTHI 12 13 0.010000 0.386709 -0.000158
Z&w^9;30P TTHI 14 15 0.010000 0.386722 -0.000144
'=
<`@ M91lV(Z un nx#e] Estimated Performance Changes based upon Root-Sum-Square method:
!NYM(6!( Nominal MTF : 0.3869
v7 (|K Estimated change : -0.0124
7F(F.ut Estimated MTF : 0.3745
yJ8}*Gj & vNt>ESPB Compensator Statistics:
/HuYduGdP Change in back focus:
}#G"!/ZA0: Minimum : -0.008974
&U~r}= Maximum : 0.008997
Dum`o^l# Mean : 0.000002
vif8 {S Standard Deviation : 0.004372
}=hoATs B`B%:# {*
j^g6; Monte Carlo Analysis:
N+M&d3H` Number of trials: 20
]rg+n c3 [b.'3a++ Initial Statistics: Normal Distribution
Dw`m>'J0 cvUut^CdK Trial Criteria Change
'K3 s4x($ 1 0.381931 -0.004936
I\upnEKKzZ 2 0.386597 -0.000269
2]} Uov 3 0.380763 -0.006103
F[kW:-ne@Z 4 0.385898 -0.000968
,B %fjcn 5 0.379542 -0.007324
o? i.v0@!K 6 0.386121 -0.000745
AM[jL'r| 7 0.388123 0.001257
zNny\ Z 8 0.385172 -0.001695
"Ug/
',jkV 9 0.386426 -0.000440
VS9]p o>= 10 0.387614 0.000748
28R>> C=R 11 0.375242 -0.011624
=~hsKBt* 12 0.386008 -0.000859
c',:@2R 13 0.388606 0.001740
+^*5${g;@H 14 0.383519 -0.003347
{@V3?pG?p 15 0.381154 -0.005712
Aw4?y[{H 16 0.382717 -0.004149
``$%L=_ m 17 0.388328 0.001462
l#b|@4:I 18 0.386187 -0.000679
WBr:|F+~s 19 0.385583 -0.001283
'cZMRR c < 20 0.383495 -0.003371
t0bhXFaiE }r}RRd Nominal 0.386866
r]8x;v1 Best 0.388606
b0YiQjS6> Worst 0.375242
3e%l8@R@ Mean 0.384451
Or+*q91j Std Dev 0.003324
(/U)> %n ahNX/3; y Compensator Statistics:
LZr0]g{Pu/ Change in back focus:
%o@['9U[j Minimum : -0.011827
UZje>. ~? Maximum : 0.006609
Pr5g6I'G Mean : 0.000099
Q1`<fD
Standard Deviation : 0.004182
.?rbny zb;(?!Bd# 90% >= 0.379542
y9C;T(oi; 50% >= 0.385583
rGnI( m. 10% >= 0.388123
VYamskK[G: U{uPt*GUd/ End of Run
