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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 6g,3s?aT Gqz)=' 公差分析结果:
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I[K%b 1B]wSvP@ Units are Millimeters.
](6vG$\ X1PlW8pd Paraxial Focus compensation is on. In this mode, all
?j$8Uy$$ compensators are ignored, except paraxial back focus change.
SE-, 1p %Bu n@ WARNING: Boundary constraints on compensators are ignored when
yW,#&>]# | using fast mode or user-defined merit functions.
KdQ|$t kk./-G Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
GN"LU>9| Mode : Sensitivities
Gg,k Sampling : 3
d1_*!LW$ Optimization Cycles : Automatic mode
]qG5Ne_ Nominal Criteria : 0.38686619
G/;aZ Test Wavelength : 0.5460
91Sb=9 F"? *@L Fields: User Defined Real Image height in Millimeters
*ww(5 t # X-Field Y-Field Weight VDX VDY VCX VCY
D7'0o`| 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
(dnc7KrM 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
iYs?B0*JWK 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
%iFIY=W 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
4!W?z2ly~R 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
MBrVh6z> 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
|y=F (6Z &y wY?ox Sensitivity Analysis:
s|`)' otVdx&%] |------------ Minimum ------------| |------------ Maximum ------------|
,colGth54 Type Value Criteria Change Value Criteria Change
6y!?xot TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
0s[3:bZ\Ia TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
>V=@[B(0 TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
}n8;A;axi TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
$ =a$z" TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
&8L\FAY0%9 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
$d[:4h~ 4^9_E&Fa Worst offenders:
Eu~wbU"% Type Value Criteria Change
q)y8Bv| TTHI 10 11 -0.010000 0.375901 -0.010965
V!tBipX% TTHI 4 6 0.010000 0.378999 -0.007867
eV}Tx;1|} TTHI 2 3 0.010000 0.380196 -0.006670
-%$
dFq TTHI 7 8 -0.010000 0.380585 -0.006282
\>azY
g TTHI 4 6 -0.010000 0.380717 -0.006149
t O;W?g TTHI 10 11 0.010000 0.385879 -0.000987
!9OgA TTHI 2 3 -0.010000 0.386393 -0.000473
,QAp5I%3= TTHI 7 8 0.010000 0.386480 -0.000386
5!p'n#_ TTHI 12 13 0.010000 0.386709 -0.000158
ZO$T/GE6% TTHI 14 15 0.010000 0.386722 -0.000144
z3LPR:&Z &h[}5 eZ$1|Sj]j Estimated Performance Changes based upon Root-Sum-Square method:
>7Q7H#~w Nominal MTF : 0.3869
}-iOYSn Estimated change : -0.0124
!}48;P l Estimated MTF : 0.3745
^C
T}i' 2 ZXF_ o Compensator Statistics:
"A3xX&9-q Change in back focus:
izo
$0 Minimum : -0.008974
2a-hf|b1 Maximum : 0.008997
TnAX;+u Mean : 0.000002
)S?}huX Standard Deviation : 0.004372
y5h[^K3 YNk|UwJi IQv>{h} Monte Carlo Analysis:
L@GD$F=<0 Number of trials: 20
5(Oc"0''H 11+_OC2-
Initial Statistics: Normal Distribution
z|H>jit+ ~cwwB{ Trial Criteria Change
Z_+No :F7I 1 0.381931 -0.004936
ywte\} 2 0.386597 -0.000269
4N:
;Mo&B 3 0.380763 -0.006103
. %7A7a 4 0.385898 -0.000968
1^dWmxUZH 5 0.379542 -0.007324
eQj/)@B:V 6 0.386121 -0.000745
pQ8+T|0x 7 0.388123 0.001257
i(rY'o2 BN 8 0.385172 -0.001695
h (2k;M^s 9 0.386426 -0.000440
1A`";E& 10 0.387614 0.000748
e vuP4-[y 11 0.375242 -0.011624
E~^'w.1 12 0.386008 -0.000859
3J<,2 13 0.388606 0.001740
g.s oNqt= 14 0.383519 -0.003347
Df^S77&c! 15 0.381154 -0.005712
IrC=9%pd$R 16 0.382717 -0.004149
~G:7*:[b 17 0.388328 0.001462
Pq%cuT% 18 0.386187 -0.000679
Fwqf4&/ 19 0.385583 -0.001283
'"^JNb^I 20 0.383495 -0.003371
;wrgpP3 ]+P&Y: Nominal 0.386866
Zlo,#q Best 0.388606
eH{ 9w8~ Worst 0.375242
TVA1FD Mean 0.384451
9_{!nQC.g Std Dev 0.003324
FeLP!oS> <&iBR Compensator Statistics:
Gy%e%' Change in back focus:
@35shLs Minimum : -0.011827
4fswx@l Maximum : 0.006609
H;1}Nvvd Mean : 0.000099
pkx>6(Y Standard Deviation : 0.004182
zdE^v{}| d9"4m>ymS 90% >= 0.379542
Q
# gHD 50% >= 0.385583
pJ[Q.QxU 10% >= 0.388123
`>Cx!sYhV PQ>JoRs End of Run