学习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。 ^!^6 | [
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L3前面两竖线是光阑 }P(RGKQZ"
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公差分析结果: :f%FM&b
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4
Units are Millimeters. yTzP{I
5OeTOI()&5
Paraxial Focus compensation is on. In this mode, all J!5BH2bg
compensators are ignored, except paraxial back focus change. KiYO,nD;\
1{l18B`
WARNING: Boundary constraints on compensators are ignored when 6(awO2{BP
using fast mode or user-defined merit functions. 9<u^.w
#[0:5$-[
Criteria : Diffraction MTF average S&T at 180.0000 lp/mm Ck;O59A"&-
Mode : Sensitivities
N1,=5P$
Sampling : 3 fHhm)T8KB
Optimization Cycles : Automatic mode Tlrr02>B{
Nominal Criteria : 0.38686619 i; Cs,Esnf
Test Wavelength : 0.5460 e9e%8hL
sq TBlP
Fields: User Defined Real Image height in Millimeters d\aKGq;8C
# X-Field Y-Field Weight VDX VDY VCX VCY <"A|Xv'Q
1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000 [M>Md-pj
2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000 7jvy]5y8&~
3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000 +v4P9V|s
4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000 dv=y,q@W
5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105 \{r-e
6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217 3 i<,#FaL
j
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Sensitivity Analysis: U
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4;"^1 $
|------------ Minimum ------------| |------------ Maximum ------------| wKF #8Y
Type Value Criteria Change Value Criteria Change Oop5bg
TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670 qu]ch&"?U
TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867 r=GF*i[3
TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386 79 zFF
TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987 M|!^ #!a(
TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158 ,XT#V\qne
TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144 u8ofgcFYE
Y `4AML
Worst offenders: 3t<XbHF9
Type Value Criteria Change *Q2;bmIc
TTHI 10 11 -0.010000 0.375901 -0.010965 tHNvb\MR$
TTHI 4 6 0.010000 0.378999 -0.007867 bwh7.lDAl
TTHI 2 3 0.010000 0.380196 -0.006670 n]M1'yU
TTHI 7 8 -0.010000 0.380585 -0.006282 I9O9V[
TTHI 4 6 -0.010000 0.380717 -0.006149 yMdEH-?/
TTHI 10 11 0.010000 0.385879 -0.000987 s_]p6M
TTHI 2 3 -0.010000 0.386393 -0.000473 F) w.q
TTHI 7 8 0.010000 0.386480 -0.000386 @L^Fz$Sx
TTHI 12 13 0.010000 0.386709 -0.000158 *r!f! eA:
TTHI 14 15 0.010000 0.386722 -0.000144 l;i,V;@t
_&S?uz m
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Estimated Performance Changes based upon Root-Sum-Square method: p- 5)J&
Nominal MTF : 0.3869 JA W}]:jC
Estimated change : -0.0124 49f- u
Estimated MTF : 0.3745 )"?6Es SF
#_yQv? J
Compensator Statistics: Rz}?@zh_8
Change in back focus: ;t!n%SnK9!
Minimum : -0.008974 |1^>n,C
Maximum : 0.008997 ^l1tQnj)7
Mean : 0.000002 >)ZX
Standard Deviation : 0.004372 lB!`,>"c
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+|.}oL^}G
Monte Carlo Analysis: 5 e:Urv77
Number of trials: 20 K/RQ-xd4
Zu(eYH=Q
Initial Statistics: Normal Distribution 3/IQ]8g"
M=[ /v/M=
Trial Criteria Change :V2"<]
1 0.381931 -0.004936 [vki^M5i|Z
2 0.386597 -0.000269 N;,?k.vU
3 0.380763 -0.006103 SQ#6~zxl
4 0.385898 -0.000968 TJ(P TB;
5 0.379542 -0.007324 "%~\kJ(G
6 0.386121 -0.000745 l,uYp"F,ps
7 0.388123 0.001257 L(!4e
8 0.385172 -0.001695 _3$@s{k-TI
9 0.386426 -0.000440 }HS:3Dt
10 0.387614 0.000748 ]D^ dQ%{
11 0.375242 -0.011624 2}j2Bhc
12 0.386008 -0.000859 Li ,B,
13 0.388606 0.001740 mhTpR0
14 0.383519 -0.003347 C("PCD
15 0.381154 -0.005712 OJE<2:K
16 0.382717 -0.004149 9@AGx<S1
17 0.388328 0.001462 .4={K)kz|F
18 0.386187 -0.000679 H e]1<tx
19 0.385583 -0.001283 >yvP[$]!6
20 0.383495 -0.003371 `NA[zH,w3
G%)?jg@EA
Nominal 0.386866 Wd4fIegk
Best 0.388606 g+/%r91hZ
Worst 0.375242 4mOw[}@A
Mean 0.384451 <B
5^
Std Dev 0.003324 5@c,iU-L
A9PXu\%y
Compensator Statistics: U`q[5U"
Change in back focus: zjgK78!<
Minimum : -0.011827 O$x-&pW`g
Maximum : 0.006609 ulFU(%&
Mean : 0.000099 FD(zj ^*
Standard Deviation : 0.004182 {frEVHw
q!W~>c!
90% >= 0.379542 nPq\J~M
50% >= 0.385583 j)\g0u6
10% >= 0.388123 O<4i)Lx2
Qu]0BVIe
End of Run