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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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公差分析结果:
8zWBXV OxmlzQ"vM Units are Millimeters.
F=*BvI"+ f<s'prF Paraxial Focus compensation is on. In this mode, all
X,iuz/Q compensators are ignored, except paraxial back focus change.
j"D0nG, \ eyQo>( WARNING: Boundary constraints on compensators are ignored when
:)
Fp
B" using fast mode or user-defined merit functions.
~q#[5l(r8 6>LQGO Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
6/V{>MTZg Mode : Sensitivities
~'Qpf 8) Sampling : 3
kERaY9L\ Optimization Cycles : Automatic mode
ZhJ|ZvJ Nominal Criteria : 0.38686619
"$,}|T?Y` Test Wavelength : 0.5460
om*tdG KOAz-h@6 Fields: User Defined Real Image height in Millimeters
yaYIgG # X-Field Y-Field Weight VDX VDY VCX VCY
hNR>Hy\ 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
1=o(sIeA 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
<5!RAdaj+ 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
,G!_ SZ
4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
x`=5l` 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
v%l|S{>( 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
*"wD&E? P7BJ?x Sensitivity Analysis:
NkjQyMF z}b U\3! |------------ Minimum ------------| |------------ Maximum ------------|
;hfG${l; Type Value Criteria Change Value Criteria Change
hF=V
?\ TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
1!v >I"] TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
]B[/sqf TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
<g|nmu)o$ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
zx]M/=7,V# TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
2AdHj&XE TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
Bc9|rl V, onJ[&f Worst offenders:
P".qL5 Type Value Criteria Change
1WA""yb TTHI 10 11 -0.010000 0.375901 -0.010965
pS|JDMo TTHI 4 6 0.010000 0.378999 -0.007867
I;":O"ij\ TTHI 2 3 0.010000 0.380196 -0.006670
Q&U= jX TTHI 7 8 -0.010000 0.380585 -0.006282
zk^7gx3x TTHI 4 6 -0.010000 0.380717 -0.006149
a\.O L}"
TTHI 10 11 0.010000 0.385879 -0.000987
aY1#K6(y TTHI 2 3 -0.010000 0.386393 -0.000473
-"JE-n TTHI 7 8 0.010000 0.386480 -0.000386
Vo9)KxR TTHI 12 13 0.010000 0.386709 -0.000158
jtVPv] TTHI 14 15 0.010000 0.386722 -0.000144
0wE8GmG C7*Yg$`{ j"$b%| Estimated Performance Changes based upon Root-Sum-Square method:
I}Gl*@K&O Nominal MTF : 0.3869
Nno={i1jk Estimated change : -0.0124
*}WqYqOow Estimated MTF : 0.3745
1
FIiX }"; hz*a Compensator Statistics:
G}hkr Change in back focus:
|sZ9/G7 Minimum : -0.008974
v'Py[[R Maximum : 0.008997
GPhwq n{ Mean : 0.000002
\?mU$,voI Standard Deviation : 0.004372
7QL) }b.H []fj~hj XuAc3~HAd Monte Carlo Analysis:
W,oV$ s^ Number of trials: 20
1p5q}">z eEds-&_ Initial Statistics: Normal Distribution
{~p %\ b8-^wJH! Trial Criteria Change
vR.6^q 1 0.381931 -0.004936
8w@jUGsc 2 0.386597 -0.000269
B(vz$QE,$r 3 0.380763 -0.006103
E":":AC# 4 0.385898 -0.000968
I:2jwAl 5 0.379542 -0.007324
0BwQ!B. 6 0.386121 -0.000745
[(^''*7r+T 7 0.388123 0.001257
^J=txsx 8 0.385172 -0.001695
C g,w6<7 9 0.386426 -0.000440
)da8Ru 10 0.387614 0.000748
"lj:bxM2C 11 0.375242 -0.011624
_xwfz]lb+ 12 0.386008 -0.000859
$,@+Ua
13 0.388606 0.001740
Wv'B[;[) 14 0.383519 -0.003347
5TW<1'u 15 0.381154 -0.005712
:95_W/l 16 0.382717 -0.004149
]$k
m 17 0.388328 0.001462
p.7p,CyB 18 0.386187 -0.000679
k`zK 19 0.385583 -0.001283
YO4ppL~xe 20 0.383495 -0.003371
w5G34[v [~H`9Ab= Nominal 0.386866
s5|)4Zac Best 0.388606
L7'X7WYf& Worst 0.375242
,UJPLj^ Mean 0.384451
CZno2$8@e Std Dev 0.003324
hzVr3;3Zn
JZ0+VB-3U Compensator Statistics:
`)_FO]m}jS Change in back focus:
L.&Vi"M <@ Minimum : -0.011827
\evgDZf Maximum : 0.006609
sSb&r Mean : 0.000099
jS)-COk Standard Deviation : 0.004182
gM]/Y6*$b "tbBbEj?d 90% >= 0.379542
z>#$#:Z4 50% >= 0.385583
NY
w(hAPv 10% >= 0.388123
"@bk$o= H zK=UcD End of Run