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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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dok)Je I'?6~Sn3 L3前面两竖线是
光阑 i2`# loBtd%wY 公差分析结果:
FZH-q!"^cK BD4`eiu" Units are Millimeters.
*Er? C; rtus`A5p Paraxial Focus compensation is on. In this mode, all
Vcr VaBw compensators are ignored, except paraxial back focus change.
`2,a(Sk# Ox~ 9_d WARNING: Boundary constraints on compensators are ignored when
\1]rlzXGUT using fast mode or user-defined merit functions.
}s(C^0x h07eEg Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
5y040
N- Mode : Sensitivities
Fh^ox"3c Sampling : 3
X5 j=C] Optimization Cycles : Automatic mode
=!<^^6LZ Nominal Criteria : 0.38686619
-<PC"B Test Wavelength : 0.5460
"ee'2O KxX[S.C Fields: User Defined Real Image height in Millimeters
5a6VMqQ6 # X-Field Y-Field Weight VDX VDY VCX VCY
Ox|TMSb^ 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
R3Ee%0QK 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
6< >SHw 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
Co[n--@C 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
-,|ha>r 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
VyY.r#@ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
e"~)Utk <}]{~y Sensitivity Analysis:
S~> 5INud 9qre|AA |------------ Minimum ------------| |------------ Maximum ------------|
|AC6sfA+ Type Value Criteria Change Value Criteria Change
KJdzv!l= TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
GQ[pG{_+ TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
a*s\Em7f TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
kN.B/itvA TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
aHC%19UN TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
rH.gF43O: TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
!*_K.1' V_f`0\[x Worst offenders:
G5;V.#"Z[ Type Value Criteria Change
*i@T!O(1)M TTHI 10 11 -0.010000 0.375901 -0.010965
-bm,:Iy! TTHI 4 6 0.010000 0.378999 -0.007867
+sRP<as TTHI 2 3 0.010000 0.380196 -0.006670
r:NH6tAL TTHI 7 8 -0.010000 0.380585 -0.006282
l])Q.m TTHI 4 6 -0.010000 0.380717 -0.006149
kW+G1| TTHI 10 11 0.010000 0.385879 -0.000987
,VWGq@o% TTHI 2 3 -0.010000 0.386393 -0.000473
7*;^UqGjz TTHI 7 8 0.010000 0.386480 -0.000386
h R~v TTHI 12 13 0.010000 0.386709 -0.000158
!k-` eJ| TTHI 14 15 0.010000 0.386722 -0.000144
EHhd;,;O 9~~UM<66W . ,R4WA, Estimated Performance Changes based upon Root-Sum-Square method:
;`X~ k|7K Nominal MTF : 0.3869
8YKQItK Estimated change : -0.0124
;'^, ,{ Estimated MTF : 0.3745
i.M2E$b| tr=@+WHp Compensator Statistics:
{ *$9, Change in back focus:
:<%vE !$ Minimum : -0.008974
{R8=}Qo Maximum : 0.008997
(bvoF5% Mean : 0.000002
ESv:1o`?n Standard Deviation : 0.004372
v)+@XU2wZ OpQ8\[X+ %t[K36,p Monte Carlo Analysis:
CKd3w8; Number of trials: 20
vYdlSe=6G M _ (2sq Initial Statistics: Normal Distribution
:1MMa6 )8'jxiGs Trial Criteria Change
OD|1c6+X 1 0.381931 -0.004936
N,|r1u 9X# 2 0.386597 -0.000269
~K`1 3 0.380763 -0.006103
hy!6g n 4 0.385898 -0.000968
F.
T@)7 5 0.379542 -0.007324
agT7=hX]. 6 0.386121 -0.000745
&D*8l?A/1f 7 0.388123 0.001257
Y&GuDLUF 8 0.385172 -0.001695
]|
WA#8_| 9 0.386426 -0.000440
4U{m7[ 10 0.387614 0.000748
K'Spbn!nC 11 0.375242 -0.011624
EY$?^iS 12 0.386008 -0.000859
61|B]ei/ 13 0.388606 0.001740
$
S~%Ks C 14 0.383519 -0.003347
pBU]=[M0 15 0.381154 -0.005712
-_|]N/v\ 16 0.382717 -0.004149
R@n5AN( 17 0.388328 0.001462
s.rT] 18 0.386187 -0.000679
.eY`Ri<3t 19 0.385583 -0.001283
n_P(k-^U* 20 0.383495 -0.003371
?!7
SzLll ^1VbH3M Nominal 0.386866
OoM_q/oI Best 0.388606
c/'M#h)" Worst 0.375242
X+at%L= Mean 0.384451
=UUd8,C/ Std Dev 0.003324
aTClw<6} >[Rz
<yv Compensator Statistics:
%)JRbX<c Change in back focus:
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