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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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光阑 ??i4z[0M }irn'`I 公差分析结果:
h#hxOVl%x %Jf<l&K.` Units are Millimeters.
]Y| 9?9d Cb_oS4vM Paraxial Focus compensation is on. In this mode, all
1<h>B: compensators are ignored, except paraxial back focus change.
>R2SQA o 4
8{vE3JY WARNING: Boundary constraints on compensators are ignored when
2]c{P\ using fast mode or user-defined merit functions.
W},b{NT v i)%$~ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
f(eQ+0D Mode : Sensitivities
$DP&a1'g Sampling : 3
7 uarh! Optimization Cycles : Automatic mode
ne>g?"Pex{ Nominal Criteria : 0.38686619
thqS*I'#g Test Wavelength : 0.5460
6ITLGA )*5G">) )p Fields: User Defined Real Image height in Millimeters
[,aqQ6S # X-Field Y-Field Weight VDX VDY VCX VCY
RuG-{NF{F 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
P(>(K{v 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
-OYDe@Wb] 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
"W#t;;9Wz 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
9 F^;! 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
,b$2= JO'f 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
w~@-9<^K]v P=5NKg Sensitivity Analysis:
Ce'pis %ObD2)s6:^ |------------ Minimum ------------| |------------ Maximum ------------|
I=Oy- Type Value Criteria Change Value Criteria Change
#2:a[
~Lf TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
%Z8vdU# l TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
CWO=0_>2 TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
(Bo bB]~a TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
L}j0a> =x4 TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
GyC /_ntn TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
-~4+w w#^U45y1v Worst offenders:
IF@HzT;Q Type Value Criteria Change
?R5'#|EyX TTHI 10 11 -0.010000 0.375901 -0.010965
Uw<&Wm`' TTHI 4 6 0.010000 0.378999 -0.007867
!?[oIQ)h TTHI 2 3 0.010000 0.380196 -0.006670
b8f+,2Tk TTHI 7 8 -0.010000 0.380585 -0.006282
B/"2., TTHI 4 6 -0.010000 0.380717 -0.006149
|8)Xc=Hz TTHI 10 11 0.010000 0.385879 -0.000987
F8+e,x TTHI 2 3 -0.010000 0.386393 -0.000473
+3,|"g:: TTHI 7 8 0.010000 0.386480 -0.000386
E:nt)Ef, TTHI 12 13 0.010000 0.386709 -0.000158
9B+wYJp TTHI 14 15 0.010000 0.386722 -0.000144
,eQ[Fi!! 9B)(>~q A.Bk/N1G Estimated Performance Changes based upon Root-Sum-Square method:
&gc`<kLu Nominal MTF : 0.3869
X-B8MoG| Estimated change : -0.0124
ZB5?!.ND Estimated MTF : 0.3745
K<v:-TjQZ: /9Ilo\MdD Compensator Statistics:
k:#6^!b1 Change in back focus:
s T3p>8n Minimum : -0.008974
>m_v5K Maximum : 0.008997
D{'#er Mean : 0.000002
e@F|NCQ.9 Standard Deviation : 0.004372
v.W{x?5 WP-jtZ?!" &k
T"oK Monte Carlo Analysis:
v6e%#= Number of trials: 20
~DLIz g7p! ' eO/PnYW Initial Statistics: Normal Distribution
*rqm8z50a F?Or;p5`Y Trial Criteria Change
|
W#~F&{] 1 0.381931 -0.004936
,2 WH/" 2 0.386597 -0.000269
a%hGZCI 3 0.380763 -0.006103
Su8'$CFz$. 4 0.385898 -0.000968
=hw^P%Zn 5 0.379542 -0.007324
Xy#VQ{! 6 0.386121 -0.000745
vW' 5` % 7 0.388123 0.001257
"E*8h/4u 8 0.385172 -0.001695
H?}wl% 9 0.386426 -0.000440
Fc0jQ@4= 10 0.387614 0.000748
!Y;<:zx5 11 0.375242 -0.011624
~4
FDKUC 12 0.386008 -0.000859
?gV'(3
! 13 0.388606 0.001740
;mO,3dV 14 0.383519 -0.003347
7unA"9=[4V 15 0.381154 -0.005712
qmmv7== 16 0.382717 -0.004149
gJ\%>r7h 17 0.388328 0.001462
q|q::q* 18 0.386187 -0.000679
p
q-!WQ 19 0.385583 -0.001283
Kj*m r%IaU 20 0.383495 -0.003371
N4 [E~- (Cj,\r Nominal 0.386866
v`{:~q* Best 0.388606
GhnE>d;i Worst 0.375242
R @r{ Mean 0.384451
?^3B3qqh9 Std Dev 0.003324
"2h5m4 *d
l"wH& Compensator Statistics:
5fHYc0 Change in back focus:
Zd>ZY,-5 Minimum : -0.011827
`F,zenk= Maximum : 0.006609
rrQ0qg Mean : 0.000099
`I>], J/ Standard Deviation : 0.004182
6=>7M
b$ 6H;kJHn 90% >= 0.379542
*4#on> 50% >= 0.385583
3%NE/lw1 10% >= 0.388123
onzA7Gre >5i ?JUZ End of Run