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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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}20=I+ }u(d'9u L3前面两竖线是
光阑 qWRNHUd K!IF?iell 公差分析结果:
>$7wA9YhL "wT~$I" Units are Millimeters.
Ov$N" (t]lP/
Paraxial Focus compensation is on. In this mode, all
uvu**s compensators are ignored, except paraxial back focus change.
](B&l{V m&Y;/kr WARNING: Boundary constraints on compensators are ignored when
?RgU6/2 using fast mode or user-defined merit functions.
+zFV~]b /E`l:&89) Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
K^!e-Xi6 Mode : Sensitivities
j33P~H~ Sampling : 3
6Nfof Optimization Cycles : Automatic mode
6.
+[
z Nominal Criteria : 0.38686619
dD/29b( Test Wavelength : 0.5460
c8k6(#\ jjS{q,bo Fields: User Defined Real Image height in Millimeters
2x<Qt2" # X-Field Y-Field Weight VDX VDY VCX VCY
H j5WJ{p. 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
gFWEodx,9 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
T+AlcOP 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
aBqe+FXp4 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
l5\B2 +}7 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
^7ea6G" 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
EzD
-1sJ G+#| )V Sensitivity Analysis:
&xGfkCP.] T3u5al |------------ Minimum ------------| |------------ Maximum ------------|
Y{Y;EY4 Type Value Criteria Change Value Criteria Change
1jUhG2y TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
^*cMry TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
v @$evmA TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
P`Hd*xh".j TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
y (c|5CQ TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
_SBp66
r TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
Ie^Dn!0S s0XRL1kWr Worst offenders:
+!L_E6pyXE Type Value Criteria Change
ADLa.{ TTHI 10 11 -0.010000 0.375901 -0.010965
;+r) j"W TTHI 4 6 0.010000 0.378999 -0.007867
)AnlFO+V TTHI 2 3 0.010000 0.380196 -0.006670
Ac5o K TTHI 7 8 -0.010000 0.380585 -0.006282
=M/UHOY TTHI 4 6 -0.010000 0.380717 -0.006149
RB lOTQjv TTHI 10 11 0.010000 0.385879 -0.000987
Q
!RVD*( TTHI 2 3 -0.010000 0.386393 -0.000473
Ww'TCWk@ TTHI 7 8 0.010000 0.386480 -0.000386
V 9QvQA
r TTHI 12 13 0.010000 0.386709 -0.000158
eZR8<Z% TTHI 14 15 0.010000 0.386722 -0.000144
K\^&_#MG 7U{b+=,wK rx}ujjx Estimated Performance Changes based upon Root-Sum-Square method:
D<_,>{$gW Nominal MTF : 0.3869
;G4HMtL Estimated change : -0.0124
gq/ePSa Estimated MTF : 0.3745
AjL?Qh4 aiR|.opIb Compensator Statistics:
(:fE _H2z Change in back focus:
Y6;0khp Minimum : -0.008974
9U }MXY0 Maximum : 0.008997
Cdt,//xrz Mean : 0.000002
T4H oSei Standard Deviation : 0.004372
SQ^^1.V&/Y k[r./xEv+t {0)WS}& Monte Carlo Analysis:
r.a9W?(E Number of trials: 20
0'q(XB`i= _} X`t8L h Initial Statistics: Normal Distribution
_A)_K;cz < ;%q
Trial Criteria Change
4ye`;hXy 1 0.381931 -0.004936
Hz3 S^o7 2 0.386597 -0.000269
U&w5&W{F} 3 0.380763 -0.006103
6XOpB^@ 4 0.385898 -0.000968
-9H!j4]T? 5 0.379542 -0.007324
3'sWlhf; 6 0.386121 -0.000745
QN}3S0 7 0.388123 0.001257
S\v&{ 8 0.385172 -0.001695
+4:+qGAJ{ 9 0.386426 -0.000440
M[
~2,M&H 10 0.387614 0.000748
'a-5UTT 11 0.375242 -0.011624
t0asW5f 12 0.386008 -0.000859
<SC|A| 13 0.388606 0.001740
F'5d\ v 14 0.383519 -0.003347
7>2j=Y_Kp 15 0.381154 -0.005712
j3rv2W\ 16 0.382717 -0.004149
:S+U}Sm[ 17 0.388328 0.001462
,I2reG 18 0.386187 -0.000679
z[lRb]:i[ 19 0.385583 -0.001283
soqNzdTB2 20 0.383495 -0.003371
L
yA(. @rK>yPhf Nominal 0.386866
"mP*}VF Best 0.388606
e}Af"LI Worst 0.375242
Pu%>j'A Mean 0.384451
$MJDB Std Dev 0.003324
^pQ;0[9Y0 "PX3%II Compensator Statistics:
rCSG@D. Change in back focus:
2`FsG/o\T~ Minimum : -0.011827
ANpY qV Maximum : 0.006609
3Ibt'$dK Mean : 0.000099
xwH|ryfs,Z Standard Deviation : 0.004182
B> "r -O %`\3V
{2* 90% >= 0.379542
<C.$Db&9 50% >= 0.385583
G|G?h 10% >= 0.388123
U*R~w5W.[ ^`>Ysc(@& End of Run