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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。
h'm-]v }p|S3/G?$! 50jZu'z: ^Iy'G44 L3前面两竖线是
光阑 XDQ5qfE| A29R5 公差分析结果:
Uu_Es{@ #T3dfVWv Units are Millimeters.
J5Ovj,[EZ -\[H>)z]RB Paraxial Focus compensation is on. In this mode, all
N> jQe compensators are ignored, except paraxial back focus change.
f Hd|tl f"RS,] WARNING: Boundary constraints on compensators are ignored when
W\Df:P {< using fast mode or user-defined merit functions.
;V0^uB.z c]%~X&Tg` Criteria : Diffraction MTF average S&T at 180.0000 lp/mm
Lm3~< vP1e Mode : Sensitivities
YN}vAFR` Sampling : 3
rt0_[i Optimization Cycles : Automatic mode
Mj6
0?k Nominal Criteria : 0.38686619
c> 0R_ Test Wavelength : 0.5460
e);`hNLih 6o
d^+>U Fields: User Defined Real Image height in Millimeters
Mz 6PH)e; # X-Field Y-Field Weight VDX VDY VCX VCY
Jo''yrJpB 1 0.000E+000 0.000E+000 1.000E+000 0.000 0.000 0.000 0.000
Marx=cNj 2 0.000E+000 1.151E+000 1.000E+000 0.000 0.000 0.000 0.000
I%:\"g"c 3 0.000E+000 1.918E+000 1.000E+000 0.000 0.000 0.000 0.000
Vbv)C3ezD 4 0.000E+000 2.685E+000 1.000E+000 0.000 0.000 0.000 0.000
3O*^[$vM 5 0.000E+000 3.452E+000 1.000E+000 0.000 -0.105 0.002 0.105
v`@M IOv 6 0.000E+000 3.836E+000 1.000E+000 0.000 -0.217 0.014 0.217
UZpQ%~/ Ao+6^z_ Sensitivity Analysis:
ON9L+"vqv0 Du #>y! |------------ Minimum ------------| |------------ Maximum ------------|
]P/i}R: Type Value Criteria Change Value Criteria Change
xzHb+1+p TTHI 2 3 -0.010000 0.386393 -0.000473 0.010000 0.380196 -0.006670
6WX?Xc]$3 TTHI 4 6 -0.010000 0.380717 -0.006149 0.010000 0.378999 -0.007867
E7q,6f3@r TTHI 7 8 -0.010000 0.380585 -0.006282 0.010000 0.386480 -0.000386
#mYe@[p@ TTHI 10 11 -0.010000 0.375901 -0.010965 0.010000 0.385879 -0.000987
WjguM TTHI 12 13 -0.010000 0.386971 0.000105 0.010000 0.386709 -0.000158
}9kn;rb$g TTHI 14 15 -0.010000 0.386958 0.000092 0.010000 0.386722 -0.000144
,FwpHs $A #(QS5J&Qq Worst offenders:
}
m"':f Type Value Criteria Change
K~4bT= TTHI 10 11 -0.010000 0.375901 -0.010965
h=Q2
?O8 TTHI 4 6 0.010000 0.378999 -0.007867
W_6gV TTHI 2 3 0.010000 0.380196 -0.006670
$xCJ5M4 TTHI 7 8 -0.010000 0.380585 -0.006282
!jf!\Uu[U TTHI 4 6 -0.010000 0.380717 -0.006149
x2TE[#>< TTHI 10 11 0.010000 0.385879 -0.000987
&kcmkRRG TTHI 2 3 -0.010000 0.386393 -0.000473
c/^l2CJ0 TTHI 7 8 0.010000 0.386480 -0.000386
Jd~M q9( TTHI 12 13 0.010000 0.386709 -0.000158
1BgHkDW TTHI 14 15 0.010000 0.386722 -0.000144
Sk:x.oOZ ;66{S'*[ U&43/;<, Estimated Performance Changes based upon Root-Sum-Square method:
k{O bm
g Nominal MTF : 0.3869
Vw3=jIQN:! Estimated change : -0.0124
6q8PLyIp Estimated MTF : 0.3745
EI)2c.A Nf)SR#; Compensator Statistics:
@+1AYVz(k Change in back focus:
#3tC"2MZ Minimum : -0.008974
~T/tk?:8Vi Maximum : 0.008997
@^J>. g Mean : 0.000002
JNT|h zV Standard Deviation : 0.004372
Ms5R7<O.7 ^x$1Nf 0x<G\ l4 Monte Carlo Analysis:
e+<| Number of trials: 20
=p7id5" LM 1Vsh< Initial Statistics: Normal Distribution
u?rX:KkS ~]`U)Aw Trial Criteria Change
Sx (E'?] 1 0.381931 -0.004936
o\PHs4Ws'7 2 0.386597 -0.000269
ZD7qw*3+ 3 0.380763 -0.006103
IxG7eX! 4 0.385898 -0.000968
:."6 g)T 5 0.379542 -0.007324
)=bW\=[8 6 0.386121 -0.000745
4@Z!?QzW 7 0.388123 0.001257
0P!Fci/t 8 0.385172 -0.001695
1*'gaa&y 9 0.386426 -0.000440
M ac?HI 10 0.387614 0.000748
Ed{sC[j= 11 0.375242 -0.011624
[Q\(kd*4 12 0.386008 -0.000859
A0,e3gb 13 0.388606 0.001740
a#x@e?GvI 14 0.383519 -0.003347
,rF!o_7 15 0.381154 -0.005712
=fdW H4 16 0.382717 -0.004149
Xy`'h5
17 0.388328 0.001462
R=$}uDFmW 18 0.386187 -0.000679
&Vu-*? 19 0.385583 -0.001283
Sfp-ns32%A 20 0.383495 -0.003371
q}0I`$MU rz2,42H] Nominal 0.386866
U!K#g_} Best 0.388606
hN\sC9a1 Worst 0.375242
[-81s!#mkw Mean 0.384451
M'oZK Std Dev 0.003324
AxF$7J( Fu\#:+5\ Compensator Statistics:
&.#dZ}J Change in back focus:
}W[=O:p Minimum : -0.011827
wlslG^^(! Maximum : 0.006609
.3@Pz]\M#> Mean : 0.000099
vQy<%[QO Standard Deviation : 0.004182
~?)y'? V?`|Ha} 90% >= 0.379542
ac966<# 50% >= 0.385583
qK~]au:C 10% >= 0.388123
'WBhW5@ L `=*Pwcj End of Run