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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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i khEHMvVH 0c`wJktWK L3前面两竖线是
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\ _|s{G 公差分析结果:
3[ Z? `X I=lA7} Units are Millimeters.
[(dAv7YbN lual'~ Paraxial Focus compensation is on. In this mode, all
Zo&U3b{Dy compensators are ignored, except paraxial back focus change.
CP={|]>+S Li7/pUq>}! WARNING: Boundary constraints on compensators are ignored when
Q04N using fast mode or user-defined merit functions.
5qFqH &d~6MSk Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
9RAN$\AKy Mode : Sensitivities
M\T6cN@m Sampling : 3
Z/2#h<zj Optimization Cycles : Automatic mode
0gnr@9,X Nominal Criteria : 0.38686619
7ZJYT#>b Test Wavelength : 0.5460
=MoPOib\n 30B!hj$C Fields: User Defined Real Image height in Millimeters
3 i>uKU1 # X-Field Y-Field Weight VDX VDY VCX VCY
$)PNf'5Zg 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
==Y^~ab;K 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
okfhd{9 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
.+ _x|?' 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
v/CXX<^U( 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
0]5QX/I 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
3ne=7Mj `qUmOFl Sensitivity Analysis:
+VzR9ksJj 5 kQC |------------ Minimum ------------| |------------ Maximum ------------|
Thz&wH`W Type Value Criteria Change Value Criteria Change
O~igwFe TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
HQ4o^ WC TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
l$z-' TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
!v$hqNt7 TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
0 5 `x$f TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
.,feRK>3 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
|nv8&L8 wl}Q|4rZ Worst offenders:
_W&.{
7 Type Value Criteria Change
6$`8y,TMSt TTHI 10 11 -0.010000 0.375901 -0.010965
*y u|]T TTHI 4 6 0.010000 0.378999 -0.007867
X(N!y"z TTHI 2 3 0.010000 0.380196 -0.006670
o2&mhT TTHI 7 8 -0.010000 0.380585 -0.006282
i]YH"t8GY TTHI 4 6 -0.010000 0.380717 -0.006149
@_0XK)pW TTHI 10 11 0.010000 0.385879 -0.000987
UDGVq S!,E TTHI 2 3 -0.010000 0.386393 -0.000473
4fp}`U TTHI 7 8 0.010000 0.386480 -0.000386
0(HUy`]> TTHI 12 13 0.010000 0.386709 -0.000158
Sh=z TTHI 14 15 0.010000 0.386722 -0.000144
j#.Aiy:, 3-z57f,}6~ ".~,(* Estimated Performance Changes based upon Root-Sum-Square method:
U%m,:b6V Nominal MTF : 0.3869
Pv/$;R% Estimated change : -0.0124
5_0Eh!sx Estimated MTF : 0.3745
Np+<)q2 E%2]c?N5 Compensator Statistics:
qy/xJ>: Change in back focus:
kpLDK81I Minimum : -0.008974
+<&_1%5+ Maximum : 0.008997
XeJn,= Mean : 0.000002
3Vs8"BFjz Standard Deviation : 0.004372
h 5<46!P
Jf9a<[CcV g-Vxl|hR Monte Carlo Analysis:
F7x]BeTM Number of trials: 20
Qw}uB$S> ?s6v>#H% Initial Statistics: Normal Distribution
^e1@o\] J>TNyVaoQ Trial Criteria Change
b<n*wH 1 0.381931 -0.004936
3fM8W>
*7 2 0.386597 -0.000269
Uyj6Ij_Pj) 3 0.380763 -0.006103
*%E4,(T 4 0.385898 -0.000968
_h6SW2:z!E 5 0.379542 -0.007324
e
^2n58 6 0.386121 -0.000745
`-/-(v+ i 7 0.388123 0.001257
]{s0/(EA 8 0.385172 -0.001695
"m4._4U 9 0.386426 -0.000440
0*]n#+= 10 0.387614 0.000748
&N:Iirg 11 0.375242 -0.011624
8BE] A_X 12 0.386008 -0.000859
qHaH=g% 13 0.388606 0.001740
L `NY^ 14 0.383519 -0.003347
c#(Hh{0 15 0.381154 -0.005712
9sG]Q[:.] 16 0.382717 -0.004149
VddHK 17 0.388328 0.001462
( RO-~- 18 0.386187 -0.000679
:e/*5ix 19 0.385583 -0.001283
@<(4J
20 0.383495 -0.003371
%e^GfZ sPX&XqWx Nominal 0.386866
%|j`z?i| Best 0.388606
mX 3p Worst 0.375242
Znr@-=xZO* Mean 0.384451
+`,;tz=? Std Dev 0.003324
:^7>kJ5? hh8Grl; Compensator Statistics:
xP4}LL9) Change in back focus:
;NU-\<Q{ Minimum : -0.011827
|;:g7eb Maximum : 0.006609
d|?Xo\+ Mean : 0.000099
I+=+ ,iXhB Standard Deviation : 0.004182
J-#V_TzJ? ZtyDip'x 90% >= 0.379542
E75/EQ5p]p 50% >= 0.385583
"!+gA& 10% >= 0.388123
L4,b ThSG is
}>+&_ End of Run