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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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公差分析结果:
$|N6I j#l=%H Units are Millimeters.
O=B=0 D)d]o& Paraxial Focus compensation is on. In this mode, all
`Ij@;=( compensators are ignored, except paraxial back focus change.
1EyN
|m| }Q\%tZC#T WARNING: Boundary constraints on compensators are ignored when
S,#1^S using fast mode or user-defined merit functions.
oz)[- yPN '@{ 5# Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
o`bch?] Mode : Sensitivities
uO%0rKW Sampling : 3
&d_^k.%y Optimization Cycles : Automatic mode
cU1o$NRx Nominal Criteria : 0.38686619
#@R0$x Test Wavelength : 0.5460
Q+:y Br1R++] Fields: User Defined Real Image height in Millimeters
OUX7
*_ # X-Field Y-Field Weight VDX VDY VCX VCY
hlzB
cz* 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
ij"~]I 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
3$|/7(M&DA 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
e;]tO-Nu 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
['d9sEv . 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
%w`d 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
&V].,12x c_J9CKqc Sensitivity Analysis:
|xO*!NR g'"~' |------------ Minimum ------------| |------------ Maximum ------------|
T &ZQie/ Type Value Criteria Change Value Criteria Change
E&M(QX5 TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
@X==[gQ TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
NR4+&d TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
w#A)B<Y/" TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
Z)?$ZI@ TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
?uWUs )9 TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
b^o4Q[ X1j8tg Worst offenders:
J'44j;5& Type Value Criteria Change
a<cwrDZ TTHI 10 11 -0.010000 0.375901 -0.010965
mRk)5{ TTHI 4 6 0.010000 0.378999 -0.007867
d0El2Ct8 TTHI 2 3 0.010000 0.380196 -0.006670
Gm~([Ln{ TTHI 7 8 -0.010000 0.380585 -0.006282
8z=#
0+0 TTHI 4 6 -0.010000 0.380717 -0.006149
m,.Y:2?*V TTHI 10 11 0.010000 0.385879 -0.000987
|[\;.gT K TTHI 2 3 -0.010000 0.386393 -0.000473
kAftW
' TTHI 7 8 0.010000 0.386480 -0.000386
5'2kP{; TTHI 12 13 0.010000 0.386709 -0.000158
`4Yo-@iVP TTHI 14 15 0.010000 0.386722 -0.000144
~?Zib1f) [doEArwn JZ5k3#@e Estimated Performance Changes based upon Root-Sum-Square method:
O?uICnmi6 Nominal MTF : 0.3869
waMF~#PJlt Estimated change : -0.0124
dC=[o\ Estimated MTF : 0.3745
*z0!=>( #M-!/E Compensator Statistics:
N
J3;[qJ Change in back focus:
G m~ ./- Minimum : -0.008974
\"lz,bT Maximum : 0.008997
.9~j%]q Mean : 0.000002
!KHgHKEW^ Standard Deviation : 0.004372
0ho;L 0Nr' v$ ti=uk$ F*72g)hVh Monte Carlo Analysis:
\ .xS Number of trials: 20
4fLRl-) '|8dt "C Initial Statistics: Normal Distribution
?f?5Kye ^<I( Trial Criteria Change
[F-R*}&x 1 0.381931 -0.004936
sd%j&Su#4 2 0.386597 -0.000269
sJ6.3=
c 3 0.380763 -0.006103
A3]A5s6 4 0.385898 -0.000968
m:@y_:X0 5 0.379542 -0.007324
`v*HH}aDO 6 0.386121 -0.000745
`Ba]i) ! 7 0.388123 0.001257
-FZC|[is 8 0.385172 -0.001695
"\4W])30 9 0.386426 -0.000440
F#Lo^ 8 10 0.387614 0.000748
yD+4YD 11 0.375242 -0.011624
HTQZIm 12 0.386008 -0.000859
;V,L_"/X 13 0.388606 0.001740
,#Z%0NLe 14 0.383519 -0.003347
aODh5 15 0.381154 -0.005712
;aQ``B 16 0.382717 -0.004149
l=DF)#>w 17 0.388328 0.001462
#U:|-
a.> 18 0.386187 -0.000679
,s8/6n# 19 0.385583 -0.001283
10SI&O 20 0.383495 -0.003371
erH,EE^-x< -.Wcz| Nominal 0.386866
us.#|~i<h Best 0.388606
VF`!ks Worst 0.375242
Pn,I^Ej . Mean 0.384451
*5)UIRd Std Dev 0.003324
VN`.*B|9[ Ht[$s4 0P Compensator Statistics:
eiMP: Change in back focus:
>wW{$ Minimum : -0.011827
O= S[n Maximum : 0.006609
Qs1p Mean : 0.000099
ocGrB)7eD Standard Deviation : 0.004182
P$EiD+5#z OZ&/&?!XE 90% >= 0.379542
kL8rqv^ 50% >= 0.385583
gFR}WBl/ 10% >= 0.388123
.S//T/3O]Q uu6 JZp End of Run