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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 `#HtVI V=^B7a.;> 公差分析结果:
F!7dGa$ mi[t1cN)= Units are Millimeters.
Jq>rA Vu.VH([b]Q Paraxial Focus compensation is on. In this mode, all
&1/OwTI4J compensators are ignored, except paraxial back focus change.
a+'k#m @k=UB&?I WARNING: Boundary constraints on compensators are ignored when
#($~e| using fast mode or user-defined merit functions.
YRg"{[+#]k yFoPCA86y Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
|RjAp.pm Mode : Sensitivities
}1fi# Sampling : 3
nTsKJX%\ Optimization Cycles : Automatic mode
'9{`Czc(Gb Nominal Criteria : 0.38686619
+3uPHpMB- Test Wavelength : 0.5460
WwsH7X) Q":,oZ2 Fields: User Defined Real Image height in Millimeters
r>: ~!o* # X-Field Y-Field Weight VDX VDY VCX VCY
. ;rE4B 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
|d$4Fu(M~ 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
RW{y.WhB 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
"I3
#/~q 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
ziDvDu= 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
b5Q|$E 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
Mj&G5R~_ uMx6: Sensitivity Analysis:
xXf,j#`" 0=0,ix7?# |------------ Minimum ------------| |------------ Maximum ------------|
8)lrQvZ Type Value Criteria Change Value Criteria Change
dGyrzuPJ TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
lArKfs/ TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
dI%?uk TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
1=Z!ZY}}e TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
z$gtGrU TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
t4iD<{4 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
Brtsig,4 >.M>,m\ Worst offenders:
|nCVM\+5T Type Value Criteria Change
>?Duz+W) TTHI 10 11 -0.010000 0.375901 -0.010965
_ amP:h TTHI 4 6 0.010000 0.378999 -0.007867
yky%+@2q TTHI 2 3 0.010000 0.380196 -0.006670
rFUR9O.{E TTHI 7 8 -0.010000 0.380585 -0.006282
5JHWt<n{P TTHI 4 6 -0.010000 0.380717 -0.006149
+4$][3. TTHI 10 11 0.010000 0.385879 -0.000987
FsO_|r TTHI 2 3 -0.010000 0.386393 -0.000473
Fw\g\ TTHI 7 8 0.010000 0.386480 -0.000386
;j.-6#n TTHI 12 13 0.010000 0.386709 -0.000158
+Xp1=2Mq TTHI 14 15 0.010000 0.386722 -0.000144
qJ sH yR?./M! ~-<MoCm! Estimated Performance Changes based upon Root-Sum-Square method:
SRtw Nominal MTF : 0.3869
T|8:_4/l Estimated change : -0.0124
0 N"N$f Estimated MTF : 0.3745
0SfW:3 [^Bjmw[7 Compensator Statistics:
M^*\$K% Change in back focus:
d~AL4~} Minimum : -0.008974
]#Cc7wa
Maximum : 0.008997
),CKuq> Mean : 0.000002
nK32or3 Standard Deviation : 0.004372
)X;051Q N>Ih2>8t &?1O D5 Monte Carlo Analysis:
06O_!"GD} Number of trials: 20
2"HTD|yy ,-hbwd~M Initial Statistics: Normal Distribution
#}Yrxf &<x.D]FA] Trial Criteria Change
~o#mX?'7 1 0.381931 -0.004936
=&6sU{j* 2 0.386597 -0.000269
.uVd' 3 0.380763 -0.006103
Unv'm5/L 4 0.385898 -0.000968
y>.t[*zT 5 0.379542 -0.007324
m%
3 D 6 0.386121 -0.000745
Ml$<x"Q 7 0.388123 0.001257
z3]W # 8 0.385172 -0.001695
?m5EXe 9 0.386426 -0.000440
7*j!ZUzp 10 0.387614 0.000748
P3`$4p? 11 0.375242 -0.011624
B2oKvgw 12 0.386008 -0.000859
^D5Jqh)
13 0.388606 0.001740
76"4Q! 14 0.383519 -0.003347
-uWV(
,| 15 0.381154 -0.005712
gyD ;kn\CP 16 0.382717 -0.004149
O^3kPVr 17 0.388328 0.001462
4uzMO < 18 0.386187 -0.000679
D
HT^.UM28 19 0.385583 -0.001283
zBlv?JwG 20 0.383495 -0.003371
z~X/.>
_XT'h;m Nominal 0.386866
~5`oNa Best 0.388606
|ZE^'e*k Worst 0.375242
lyX3'0c Mean 0.384451
E(j#R" Std Dev 0.003324
(w#t V* BGBHA"5fz Compensator Statistics:
=qc+sMo Change in back focus:
BO#tn{(# Minimum : -0.011827
vue^bn Maximum : 0.006609
aUzCKX%>C Mean : 0.000099
Lj(cCtb) Standard Deviation : 0.004182
m)} 01N4 njf\fw_ 90% >= 0.379542
%2T
i
Rb 50% >= 0.385583
k`Ifl) 10% >= 0.388123
')!X1A{ B Z|A&; End of Run