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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 @E:,lA xhcK~5C 公差分析结果:
p<M\U"5Ye 0RoU}r@z4 Units are Millimeters.
*/|BpakD< S)DnPjN{ Paraxial Focus compensation is on. In this mode, all
M(/r%-D compensators are ignored, except paraxial back focus change.
B^g ?=|{ j~*L~7 WARNING: Boundary constraints on compensators are ignored when
b0oMs=uBn using fast mode or user-defined merit functions.
XQw>EZdj_N N<~ku<nAU Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
S~|T4q( Mode : Sensitivities
M![J2= Sampling : 3
cTG|fdgMW Optimization Cycles : Automatic mode
o"*AtGR+" Nominal Criteria : 0.38686619
e=.]F*:J Test Wavelength : 0.5460
w K}T`*k r?/'!!4 Fields: User Defined Real Image height in Millimeters
(DI>5.x" # X-Field Y-Field Weight VDX VDY VCX VCY
cFJY^A 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
RsYU59_Y 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
uCcYPvm 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
Dd\jHF>u 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
4ecP*g 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
F]<Xv" 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
EVGt 5z =zz~kon9 Sensitivity Analysis:
>D4#y ,N)/w1?I |------------ Minimum ------------| |------------ Maximum ------------|
O&Y*pOg Type Value Criteria Change Value Criteria Change
/HaHH.e TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
MjU6/pO}L TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
9gmW&{6q TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
RNe^;
B TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
cI4K+ TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
\ZkA>oO". TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
BBev< maNl^i Worst offenders:
5rU[Tir Type Value Criteria Change
r4SXE\
G TTHI 10 11 -0.010000 0.375901 -0.010965
~Yy>zUH^X TTHI 4 6 0.010000 0.378999 -0.007867
H5Io{B%= TTHI 2 3 0.010000 0.380196 -0.006670
N(Tz%o4 TTHI 7 8 -0.010000 0.380585 -0.006282
ye,>A. TTHI 4 6 -0.010000 0.380717 -0.006149
W>j !Q^? TTHI 10 11 0.010000 0.385879 -0.000987
&__es{;P TTHI 2 3 -0.010000 0.386393 -0.000473
C@'h<[v`1v TTHI 7 8 0.010000 0.386480 -0.000386
l`f/4vy TTHI 12 13 0.010000 0.386709 -0.000158
QD0"rxZJ TTHI 14 15 0.010000 0.386722 -0.000144
%yv<y+yP~ G6$kv2(k`@ *Qg _F6y Estimated Performance Changes based upon Root-Sum-Square method:
,Vt/(x- Nominal MTF : 0.3869
Y!nJg1 Estimated change : -0.0124
@}}$zv6l, Estimated MTF : 0.3745
E2Q[ZoVS !:q/Ye3. Compensator Statistics:
X\bOz[\ Change in back focus:
gaZu;t2u Minimum : -0.008974
,[P{HrHx Maximum : 0.008997
OCBgR4I Mean : 0.000002
n(;|q&3 Standard Deviation : 0.004372
SAy=WV
EK6:~ 0Ziw_S\d&s Monte Carlo Analysis:
K/IWH[ Number of trials: 20
HTX?,C_ ]~'5\58sP Initial Statistics: Normal Distribution
CxwoBuG=? Vf]
"L.G Trial Criteria Change
--$
4Q(# 1 0.381931 -0.004936
@~^5l 2 0.386597 -0.000269
l`#4KCL( 3 0.380763 -0.006103
Vl&?U 4 0.385898 -0.000968
,$s8GAmq 5 0.379542 -0.007324
|)(VsVG& 6 0.386121 -0.000745
RI(DXWM|h 7 0.388123 0.001257
UC]\yUK1J 8 0.385172 -0.001695
-p]1=@A<} 9 0.386426 -0.000440
ywGd> @ 10 0.387614 0.000748
\LR~r%(rM 11 0.375242 -0.011624
v0z5j6)-1 12 0.386008 -0.000859
ILEz;D{] 13 0.388606 0.001740
(l^3Z3zf& 14 0.383519 -0.003347
E8$20Ue 15 0.381154 -0.005712
O}-jCW;K 16 0.382717 -0.004149
&Sw%<N*r 17 0.388328 0.001462
+6HVhoxU# 18 0.386187 -0.000679
.HS"}A T 19 0.385583 -0.001283
RJ 8+h 20 0.383495 -0.003371
m$}R%
P5a4ze Nominal 0.386866
2@'oe7E Best 0.388606
]zE;Tw.S Worst 0.375242
=,spvy'"*C Mean 0.384451
/uPcXq:L~ Std Dev 0.003324
:61Tun #5cEV'm; Compensator Statistics:
JEXy%hl Change in back focus:
+b0eE) Minimum : -0.011827
I`-8Air5f Maximum : 0.006609
x+Ttl4 Mean : 0.000099
Ktb\ b w Standard Deviation : 0.004182
C7lH]`W|/ mn, =i 90% >= 0.379542
*6sl 50% >= 0.385583
(G zb 10% >= 0.388123
g7}Gip}.> U`R5'Tf; End of Run