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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。
Rs0O4.yi;@ O]SjShp <TL!iM e==}qQ L3前面两竖线是
光阑 n:-:LSa+3 I'M,p<B 公差分析结果:
#R<ErX)F 4]F:QS%
x Units are Millimeters.
Wu\{)g{&
#3l&N4/ Paraxial Focus compensation is on. In this mode, all
i1"4ztZ compensators are ignored, except paraxial back focus change.
A3VXh^y+ Hvto]~=GQ WARNING: Boundary constraints on compensators are ignored when
1/O7KR`K using fast mode or user-defined merit functions.
2aef[TY s3sAw~++ Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
bcp+7b(IB Mode : Sensitivities
bF5 mCR: Sampling : 3
s%K9;(RWI Optimization Cycles : Automatic mode
x4&<Vr Nominal Criteria : 0.38686619
xU4,R cgo Test Wavelength : 0.5460
Gm0&y G(2(-x"+ Fields: User Defined Real Image height in Millimeters
$n30[P@p; # X-Field Y-Field Weight VDX VDY VCX VCY
BM_hW8&G 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
C 'YL9r-G 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
]chfa 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
a9h K8e 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
aXAV`%b 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
\J>a* 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
5.KhI <[ +}eGCZra
Sensitivity Analysis:
8ug\GlZc
}pOem} |------------ Minimum ------------| |------------ Maximum ------------|
TC7Rw}jF Type Value Criteria Change Value Criteria Change
-RisZ-n* TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
HzcI2
P`| TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
R/&Ev$: TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
9A@/5Z:v5W TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
_O76Aw-@l TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
T}%8Vlt] TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
\yIan<q $e
bx Worst offenders:
e}
=tUdDf Type Value Criteria Change
v{/z`J!JR TTHI 10 11 -0.010000 0.375901 -0.010965
S?ypka"L TTHI 4 6 0.010000 0.378999 -0.007867
oa4{s&db- TTHI 2 3 0.010000 0.380196 -0.006670
C,2k W`[V TTHI 7 8 -0.010000 0.380585 -0.006282
nH6Ny TTHI 4 6 -0.010000 0.380717 -0.006149
:qfP>Ok TTHI 10 11 0.010000 0.385879 -0.000987
ak:Y<} TTHI 2 3 -0.010000 0.386393 -0.000473
JDTlzu1hR TTHI 7 8 0.010000 0.386480 -0.000386
%XX(x'^4 TTHI 12 13 0.010000 0.386709 -0.000158
kj$Ks2!W TTHI 14 15 0.010000 0.386722 -0.000144
T1\LS*~! ZtS>'W8l =l7@YCj5c Estimated Performance Changes based upon Root-Sum-Square method:
kx6AMx!nX Nominal MTF : 0.3869
v}vwk8 Estimated change : -0.0124
p_^Jr*Mv Estimated MTF : 0.3745
M0+xl+c+ (n4\$LdP- Compensator Statistics:
4=BIYC"Lu Change in back focus:
xL-]gwq Minimum : -0.008974
Rm i4ZPb. Maximum : 0.008997
:5YL!D/& Mean : 0.000002
6ol*$Q"z Standard Deviation : 0.004372
_h?hFs,N] TBAF_$ J>@T'# Monte Carlo Analysis:
zWN<"[agc Number of trials: 20
Yo 0wufbfV 16J"QUuG Initial Statistics: Normal Distribution
mE|?0mRA % Z1 7=g@ Trial Criteria Change
thT2U8%T 1 0.381931 -0.004936
aR- ?t14 2 0.386597 -0.000269
3}Xf 3 0.380763 -0.006103
&xAwk-{W 4 0.385898 -0.000968
F'~\!dNL 5 0.379542 -0.007324
[:CV5k~xc 6 0.386121 -0.000745
@N
tiT,3k 7 0.388123 0.001257
? Zhnb0/ 8 0.385172 -0.001695
uWtj?Q+M| 9 0.386426 -0.000440
e-Pn,j 10 0.387614 0.000748
;hz;|\ko5 11 0.375242 -0.011624
*Y:;fl +v 12 0.386008 -0.000859
F,[GdE;P 13 0.388606 0.001740
zwLJ|> 14 0.383519 -0.003347
K:<j=j@51 15 0.381154 -0.005712
]
I&l0Fx 16 0.382717 -0.004149
n+'gVEBA 17 0.388328 0.001462
tL>c@w#Pv 18 0.386187 -0.000679
"j2th. 19 0.385583 -0.001283
[3@Pu.-I+M 20 0.383495 -0.003371
Y8 % bk2 ZH~=;S-t Nominal 0.386866
m }J@w~# Best 0.388606
AGWs> Worst 0.375242
*F^t)K2 Mean 0.384451
;4MC/Q/ Std Dev 0.003324
A$7j B4 cF2!By3M Compensator Statistics:
hw @)W Change in back focus:
F|wT']1Y Minimum : -0.011827
99KW("C1F Maximum : 0.006609
+u[^@>_I0 Mean : 0.000099
hy]8t1894 Standard Deviation : 0.004182
#n_ gry!5 q*^m8 90% >= 0.379542
G`oY(2U 50% >= 0.385583
2+oS'nL 10% >= 0.388123
ns&3Dh(IVP aA6m5 End of Run