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。
9I5AYa? Z9h4 pd
$B9?>a|{A @b2?BSdUp L3前面两竖线是
光阑 SH"<f_ ?|NsaW 公差分析结果:
[#X}( "`S?q G Units are Millimeters.
eMEKR5*-O qxyY2& Paraxial Focus compensation is on. In this mode, all
3DCR n : compensators are ignored, except paraxial back focus change.
GaJE(N Pec40g:#F WARNING: Boundary constraints on compensators are ignored when
)_Hv9!U]e using fast mode or user-defined merit functions.
U![$7k>,pr 247vU1 Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
<)_#6)z: Mode : Sensitivities
wmMn1q0F Sampling : 3
PktnjdFV Optimization Cycles : Automatic mode
7^@ 1cA=S Nominal Criteria : 0.38686619
qUg/mdv& Test Wavelength : 0.5460
yI!W658$6 Jv%)UR.] Fields: User Defined Real Image height in Millimeters
]A\qI>, # X-Field Y-Field Weight VDX VDY VCX VCY
cJSwA&
1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
J?E!\V&U 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
B"88 .U}$ 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
4v(?]]X 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
1o_Zw. 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
/r&4< @ 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
.'l3NV^{ ;Hp78!#, Sensitivity Analysis:
&liFUP?
B'O1dRj&6 |------------ Minimum ------------| |------------ Maximum ------------|
Aj O{c=d Type Value Criteria Change Value Criteria Change
)Fqtb;W= TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
MCXt,`}[ TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
39~WP$GM TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
RZ9_*Lq7+ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
u#V; TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
1?"Zrd TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
R+U*]5~R ojJua c4 Worst offenders:
a>y e Type Value Criteria Change
.345%j TTHI 10 11 -0.010000 0.375901 -0.010965
J!Rqm!)q TTHI 4 6 0.010000 0.378999 -0.007867
d;3f80Kd* TTHI 2 3 0.010000 0.380196 -0.006670
V.+a}J=Cw TTHI 7 8 -0.010000 0.380585 -0.006282
iHdX TTHI 4 6 -0.010000 0.380717 -0.006149
8[
ZuVJ] TTHI 10 11 0.010000 0.385879 -0.000987
rc`I l{~k TTHI 2 3 -0.010000 0.386393 -0.000473
<8h3)$ TTHI 7 8 0.010000 0.386480 -0.000386
zQGj,EAM} TTHI 12 13 0.010000 0.386709 -0.000158
ZXbq5p_ TTHI 14 15 0.010000 0.386722 -0.000144
'7@Dw;
]r#NjP IG%x(\V-e Estimated Performance Changes based upon Root-Sum-Square method:
f7%g=0.F Nominal MTF : 0.3869
mEb`ET| Estimated change : -0.0124
h,/3} Estimated MTF : 0.3745
'I[xZu/8yg ~X;sa,)L1+ Compensator Statistics:
p-z!i +
Change in back focus:
e)L!4Y44K Minimum : -0.008974
zR=g<e1xe Maximum : 0.008997
gaU^l73,C Mean : 0.000002
%yR80mn8 Standard Deviation : 0.004372
GIK.+kn\ _JKz5hSl +\vN#xDz Monte Carlo Analysis:
((BdT:T\_ Number of trials: 20
u)D!Rh V& |>Pv2 Initial Statistics: Normal Distribution
LG?b]'# eI-FJ/CJ Trial Criteria Change
{PL,3EBG 1 0.381931 -0.004936
'?$<k@mJW 2 0.386597 -0.000269
S;{[];
3 0.380763 -0.006103
nF
'U* 4 0.385898 -0.000968
tK\$LZ 5 0.379542 -0.007324
e.|t12)L " 6 0.386121 -0.000745
\qJ^n % 7 0.388123 0.001257
Lf Y[Z4 8 0.385172 -0.001695
,` $2 9 0.386426 -0.000440
#vR5a}BAk 10 0.387614 0.000748
25;`yB$ 11 0.375242 -0.011624
A<[w'" 12 0.386008 -0.000859
(Q|Y*yI 13 0.388606 0.001740
s%N6^}N 14 0.383519 -0.003347
pTYV@5| 15 0.381154 -0.005712
;s-fYS6(>{ 16 0.382717 -0.004149
A&Q!W)= 17 0.388328 0.001462
S.owVMQ 18 0.386187 -0.000679
?bG82@- 19 0.385583 -0.001283
ZgzYXh2 20 0.383495 -0.003371
}sfvzw_ DH4|lb} Nominal 0.386866
m&Y?]nbq Best 0.388606
&([Gc+"5E. Worst 0.375242
("J_< p Mean 0.384451
&KeD{M% Std Dev 0.003324
>LFj@YW_) *jy"g64j Compensator Statistics:
MV?sr[V-oP Change in back focus:
N)YoWA>#bF Minimum : -0.011827
~A>-tn}O Maximum : 0.006609
e/IVZmUn^ Mean : 0.000099
@])}+4D(S Standard Deviation : 0.004182
\j vS`+ wq#'o9s, 90% >= 0.379542
p?+;[!: 50% >= 0.385583
sO&eV68
[ 10% >= 0.388123
\Xg`@JrTM fR lJ`\ t End of Run