| infotek |
2022-01-24 09:30 |
十字元件热成像分析
简介:本文是以十字元件为背景光源,经过一个透镜元件成像在探测器上,并显示其热成像图。 <tO@dI$~> um<$L
成像示意图 [#X}( 首先我们建立十字元件命名为Target ETX>wZ li{<F{7 创建方法: 7F2:'3SQ
5Uhxl^c 面1 : iBWEZw) 面型:plane <AJRU
l 材料:Air `CL\- 孔径:X=1.5, Y=6,Z=0.075,形状选择Box HdY#cVxy h1B_*L
D5Jg(- 辅助数据: t\2-7Ohj6 首先在第一行输入temperature :300K, l7<VH z0b emissivity:0.1; +|<bb8% Mj2Dat`p9 DqI "B 面2 : -ciwIS9L
面型:plane xVI"sBUu 材料:Air VWYNq^<AT 孔径:X=1.5, Y=6,Z=0.075,形状选择Box >pol'= ?J+*i
d ",5=LW&, 位置坐标:绕Z轴旋转90度, z#n+iC$9 o8A8fHl
-4L27C 辅助数据: FyXO @yF Aj O{c=d 首先在第一行输入temperature :300K,emissivity: 0.1; )Fqtb;W= p Zxx c>r~pY~$ Target 元件距离坐标原点-161mm; VY|UB7,C gH"aMEC
gtY7N>e 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 uTl"4;&j P;X0L{u0H %rl<%%T#.M 探测器参数设定: J!Rqm!)q d;3f80Kd* 在菜单栏中选择Create/Element Primitive /plane Q/HEWk 6aAN8wO;b
tqt~F2u sP9{tk2K %X\Rfn0J" gA5DEit 元件半径为20mm*20,mm,距离坐标原点200mm。 qM>Dt a@? Bv 光源创建: hy~KY6Ta IG%x(\V-e 光源类型选择为任意平面,光源半角设定为15度。 f7%g=0.F jC-`u-_'j _jVJkg)] 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 >RiU/L d(5j#? 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 {=Py|N\\t %u Dd#+{ OaByfo<S 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 IpKI6[2{`f %yR80mn8 创建分析面: #
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vMJC 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 [H2su|rBI` &k(tDP
y7z ,I 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 +~;#!I@Di E
/ycPqD FRED在探测器上穿过多个像素点迭代来创建热图 TP`"x}ACa? ])zpx- FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 wA87|YK8* 将如下的代码放置在树形文件夹 Embedded Scripts, 3 "|A5>Vo V* ,u;*
?J"Y4,{ 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 {#+'T 13sx OJ7y 绿色字体为说明文字, 2\Yv;J+; #vR5a}BAk '#Language "WWB-COM" <1U *{y 'script for calculating thermal image map Vl:M6d1 'edited rnp 4 november 2005 c,*a|@ H
.sfM 'declarations woU3WS0 Dim op As T_OPERATION gdqED}v Dim trm As T_TRIMVOLUME Q0""wRq' Dim irrad(32,32) As Double 'make consistent with sampling !Ome;gS) Dim temp As Double q(5 Dim emiss As Double ZgzYXh2 Dim fname As String, fullfilepath As String =?hbi] tkdyR1- 'Option Explicit A+hT2Ew@t} (`f)Tt=` Sub Main \@7 4I7 'USER INPUTS DEenvS`,P nx = 31 w< |Lx#L} ny = 31 B=i%Z_r]w numRays = 1000 NB&zBJ# minWave = 7 'microns TyaK_XW maxWave = 11 'microns >DR/lBtL sigma = 5.67e-14 'watts/mm^2/deg k^4 S`[r]msw fname = "teapotimage.dat" Wp=&nh wq#'o9s, Print "" ;BEX|wxn Print "THERMAL IMAGE CALCULATION" < 'r<MA< jTok1k detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 p/jAr+XM oeG?2!Zh Print "found detector array at node " & detnode 1h?:gOig MPJ0>Ly srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 K`cy97 9OM&&Ue<E Print "found differential detector area at node " & srcnode zXeBUbVi "(E%JAwZ^W GetTrimVolume detnode, trm I,?!NzB detx = trm.xSemiApe ?)"v~vs dety = trm.ySemiApe R
#m1Aa area = 4 * detx * dety ;:ocU? Print "detector array semiaperture dimensions are " & detx & " by " & dety <V4"+5cJ8 Print "sampling is " & nx & " by " & ny O u{|o0 P6 mDwR 'reset differential detector area dimensions to be consistent with sampling
`AELe_ pixelx = 2 * detx / nx koT: r pixely = 2 * dety / ny z~yLc{M SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Z
,98 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 -.7UpDg~ (7}Zh|@W 'reset the source power )Z@hk]@?_[ SetSourcePower( srcnode, Sin(DegToRad(15))^2 )
@XX7ydG5 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" a(+u"Kr
z ?}U l( 'zero out irradiance array KKJ a?e`C For i = 0 To ny - 1 \1#!%I=. For j = 0 To nx - 1 2rX}A3%9^^ irrad(i,j) = 0.0 ltXGm)+ Next j {Gr"oO`&" Next i q3Y49d VDPq3`$+v{ 'main loop 5~SBZYI
EnableTextPrinting( False ) l)91v"vJ 4 !M6RL8{ ypos = dety + pixely / 2 { :_qa | For i = 0 To ny - 1 \!'K#%]9 xpos = -detx - pixelx / 2 4fdO Ow ypos = ypos - pixely &Zm1(k6&K %Z#[{yuFs EnableTextPrinting( True ) Y t0s Print i %v1*D^)) EnableTextPrinting( False ) F[U0TP@&* / ,
.rUn1 m_>~e}2'A For j = 0 To nx - 1 VufG7%S{ 7#iT33(3 xpos = xpos + pixelx #+PfrS= 8*yky 'shift source 38(|a5 LockOperationUpdates srcnode, True I KDh)Zm GetOperation srcnode, 1, op WevXQ-eKm op.val1 = xpos ?anKSGfj op.val2 = ypos 2HJGp+H SetOperation srcnode, 1, op %c,CfhEV%& LockOperationUpdates srcnode, False m3iB` G@Vz
}B:= raytrace ~qmu?5 DeleteRays
.)XJ- CreateSource srcnode Y@M
l}43 TraceExisting 'draw U})Z4>[bvt 1'g{tP"d 'radiometry 1`8(O >5 For k = 0 To GetEntityCount()-1 HA%r:Px If IsSurface( k ) Then 834dsl+U temp = AuxDataGetData( k, "temperature" ) +S>}<OE emiss = AuxDataGetData( k, "emissivity" ) }x}JzA+2 If ( temp <> 0 And emiss <> 0 ) Then wa4(tM2 ProjSolidAngleByPi = GetSurfIncidentPower( k ) f:K`MW frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) H)&pay irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ;Cqjg.wkB End If vxC,8Z #2*2xt End If #NLLlEE N8:&v Next k ,\RxKSU GCEq3
^/ Next j C]+T5W\"<B d[.JEgU Next i tpi>$:e EnableTextPrinting( True ) kaj6C_k| ePJtdKN: 'write out file ~.w Db,* fullfilepath = CurDir() & "\" & fname 4?^t=7N Open fullfilepath For Output As #1 tcxs%yWO1 Print #1, "GRID " & nx & " " & ny lhA<wV1-9G Print #1, "1e+308" J]|lCwF Print #1, pixelx & " " & pixely \aO.LwYm;: Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 q#~]Hp=W5 2x*C1
maxRow = nx - 1 UPkD^D, maxCol = ny - 1 t7p`A8& For rowNum = 0 To maxRow ' begin loop over rows (constant X) ~|~j01# row = "" [oQ&}3\XJ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) jHx<}< row = row & irrad(colNum,rowNum) & " " ' append column data to row string W}5 H'D Next colNum ' end loop over columns 8HLcDS# ^L<*ggw Print #1, row q:1_D> =Gq
'sy:h Next rowNum ' end loop over rows ZSTpA,+6 Close #1 zSiSZMP" +$+'|w Print "File written: " & fullfilepath KD~F5aS`[ Print "All done!!" "kjjq~l End Sub nJ4CXSdE N|ut^X+|\ 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: :oH" -R;.Md_ tU%-tlU9? 找到Tools工具,点击Open plot files in 3D chart并找到该文件 .#;;pu7W 6tbH( j}?O 打开后,选择二维平面图: sS $- PX
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