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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。 ]etLobV ku q3QW< 成像示意图 sr,8zKM) 首先我们建立十字元件命名为Target SOQm>\U'i _D7MJT 创建方法: ^,[V;3 aY7kl 面1 : ~t\Hb8o 面型:plane (r,tU( 材料:Air c-8Pc]+g 孔径:X=1.5, Y=6,Z=0.075,形状选择Box TMZg GUn Qag@#!&n +*-u_L\' 辅助数据: >v^Bn|_/ 首先在第一行输入temperature :300K, g(m3
& emissivity:0.1; w.exLC P<yd .n]P6t 面2 : qg?O+-+ 面型:plane d54(6N% 材料:Air zn|~{9>y 孔径:X=1.5, Y=6,Z=0.075,形状选择Box QHnk@R! Uv'.]#H< u1d{|fF 位置坐标:绕Z轴旋转90度, Y0iL+=[k`m AA34JVm] bAv>?Xqa 辅助数据: }wzU<(Rx 7Wub@Mp 首先在第一行输入temperature :300K,emissivity: 0.1; H@Dj$U FRpTYLA2 Qk?;n F Target 元件距离坐标原点-161mm; >AIkkQT A|p O ZVu&q{s, 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 QU0K'4Yx5j o(5Xj$Z I8
Ai_^P 探测器参数设定: ':6!f y1P KoN|K 在菜单栏中选择Create/Element Primitive /plane >en,MT| JI-q4L| m'H%O-h\ .z7%74p IKSe X \A'MEd- 元件半径为20mm*20,mm,距离坐标原点200mm。 En%PIkxeR 6u^MfOc 光源创建: i_8q!CL@{ xJ H]>#XJ 光源类型选择为任意平面,光源半角设定为15度。 qv|geBW Nq
%@(K 3gZ|^h6
+ 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。 boAu apQ` l^ 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。 8+m;zvDSU <}x_F)E[t GQ~wx1jj1 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。 L2:v#c()#) 3n-~+2l 创建分析面: 1+6)0 OH{ t~m > \(& !C>}j* 4 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。 =jZ}@L/+ Z>1\|j &t1?=F,] 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。 D.?Rc'yD gB1w,96J FRED在探测器上穿过多个像素点迭代来创建热图 *|S.[i_7 h6c0BmS{1 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。 4L}i`)CmB 将如下的代码放置在树形文件夹 Embedded Scripts, %7WQb]y '?Fw]z1$ -m*IpDi 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。 @C7iflo6 9&e=s<6dO 绿色字体为说明文字, 3B| ?{U~ uN1(l}z$ '#Language "WWB-COM" ir^%9amh 'script for calculating thermal image map fW^\G2Fk 'edited rnp 4 november 2005 kc#<Gr&Z& Yg_;Eu0'? 'declarations wWV`k Dim op As T_OPERATION QRbiO Dim trm As T_TRIMVOLUME $|~YXH~O Dim irrad(32,32) As Double 'make consistent with sampling r9[{0y!4 Dim temp As Double 5&V0(LT]C Dim emiss As Double ,n&@O,XGy
Dim fname As String, fullfilepath As String FJ]BB4
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Y 'Option Explicit *h59Vaoc Fljqh8c5 Sub Main R:49Gn:F 'USER INPUTS 4t3Y/X nx = 31 -yKx"Q9F ny = 31 Hrb67a%b numRays = 1000 Ubtu?wRBW minWave = 7 'microns zq ;YE maxWave = 11 'microns -58 sigma = 5.67e-14 'watts/mm^2/deg k^4 3q7Z?1'o
fname = "teapotimage.dat" pRS+vV3 Kgev*xg Print "" dN'2;X Print "THERMAL IMAGE CALCULATION" 9I3vW]0x[ GF(<!PC detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 :oRR1k @wa2Z Print "found detector array at node " & detnode ?"oW1a\ 05_aL` &eb srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点
c@p4,G QU0FeGtz Print "found differential detector area at node " & srcnode alu3CE M=vRy|TL GetTrimVolume detnode, trm ?LE\pk
R detx = trm.xSemiApe 1eiV[z$? dety = trm.ySemiApe N>8pA) area = 4 * detx * dety v X=zqV Print "detector array semiaperture dimensions are " & detx & " by " & dety >(N0''eM] Print "sampling is " & nx & " by " & ny /F#_~9JXG C*O648yz[ 'reset differential detector area dimensions to be consistent with sampling ;IklS*p] pixelx = 2 * detx / nx &
w%%{lM pixely = 2 * dety / ny 3]Jl\<0 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False +n#(QOz Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 k
4|*t}o7 Vaj4p""\F 'reset the source power >eF4YZ" SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 0#K?SuY.eN Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" Dw\)!,,i7U ?9jl8r> 'zero out irradiance array -Ucj|9+(a
For i = 0 To ny - 1 uK_ Q l\d For j = 0 To nx - 1 )"Ef* /+ irrad(i,j) = 0.0 oSGx7dj+ Next j Ml)0z&jQX Next i h!c6]D4!L 0MV^-M
'main loop n%N|?!rB EnableTextPrinting( False ) hN(sz /$]#L% ypos = dety + pixely / 2 Ww(($e! For i = 0 To ny - 1 AGxtmBB; xpos = -detx - pixelx / 2 SkGh@\ ypos = ypos - pixely zGm#erE 014p = W EnableTextPrinting( True ) [(%6]L} Print i r&^LSTU0! EnableTextPrinting( False ) ohI>\ >MXE)= \tL9`RKpg For j = 0 To nx - 1 @y)'h]d #g)$m}tv? xpos = xpos + pixelx xLUgbql- )9(Mt_ 'shift source b{:c0z< LockOperationUpdates srcnode, True \>8r)xC GetOperation srcnode, 1, op #Y)Gos op.val1 = xpos ym>>5 (bni op.val2 = ypos k]J!E-yI8 SetOperation srcnode, 1, op S4n ~wo LockOperationUpdates srcnode, False k91ctEp9> H
l'za raytrace N$Pi4 DeleteRays ifo^
M]v CreateSource srcnode .f+ul@o TraceExisting 'draw I/whpOg T#L/HD 'radiometry ]{tnNr>mv For k = 0 To GetEntityCount()-1 Vl91I+Ev If IsSurface( k ) Then z(-j%? temp = AuxDataGetData( k, "temperature" ) xG802?2i/; emiss = AuxDataGetData( k, "emissivity" ) $UgQ1Qc If ( temp <> 0 And emiss <> 0 ) Then SONv])); ProjSolidAngleByPi = GetSurfIncidentPower( k ) T]&%
KQ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) F*&A=@/3 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ]p,svevo End If l4 @ /}%$fB End If eB]cPo4gW K^H{B& b8 Next k v]"W.<B, @S69u s} Next j O$'BJKj-4 Zd2B4~V Next i RyI(6TZl EnableTextPrinting( True ) X\?PnD`, $:{r#mM 'write out file {'.[N79xP fullfilepath = CurDir() & "\" & fname u@(z(P Open fullfilepath For Output As #1 i_ha^mq3 Print #1, "GRID " & nx & " " & ny =dVPx<l5 Print #1, "1e+308" 6 WD( Print #1, pixelx & " " & pixely 7~gIOu Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 zv1#PfO@) Z0Tpz2m maxRow = nx - 1 MfX1&/Z+ maxCol = ny - 1 m :6. For rowNum = 0 To maxRow ' begin loop over rows (constant X) }8H_^G8 row = "" Ts+S>$ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y)
;oej~ row = row & irrad(colNum,rowNum) & " " ' append column data to row string \O*8% Next colNum ' end loop over columns C\~!2cy ;WF3w Print #1, row NU>'$s wt8?@lJ"/ Next rowNum ' end loop over rows 0E6>PE; Close #1 v)^8e0vx byT@O:f L Print "File written: " & fullfilepath R2]2#3` Print "All done!!" /|
nZ)? End Sub MLu@|Xgh aP#nK 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: q_5hKipd\b 7W)*IJ Ia>07av 找到Tools工具,点击Open plot files in 3D chart并找到该文件 kOu C@~, {S+ $C *,hg+?lZ 打开后,选择二维平面图: x]e&G!| rA=iBb3`
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