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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。 Ad$n4Ze sC"}8+[)S3 成像示意图 v4Ga0]VN$8 首先我们建立十字元件命名为Target b;GD/UI Pw0Ci 创建方法: =~KsS}`1, -e u]:4 面1 : &o3K%M;C? 面型:plane !? 5U| 材料:Air ,`A?!.K$ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box _7T@5\b:; jZoNi LjB;;&VCn 辅助数据: vhuw&.\ 首先在第一行输入temperature :300K, zTbVp8\pI emissivity:0.1; CjIu[S1% cbYLU\! 8qEK+yi, 面2 : 8ho[I] 面型:plane f:B>zp;N 材料:Air '3IC*o" 孔径:X=1.5, Y=6,Z=0.075,形状选择Box `qVjwJ!+ 'CZa3ux (b,[C\RBF 位置坐标:绕Z轴旋转90度, in`aGFQO ;6ecrQMw& eM7Bc4V 辅助数据: 6 15s5ZA G rmzkNlN 首先在第一行输入temperature :300K,emissivity: 0.1; bI.t<; >>i@r@ {O<l[|Ip Target 元件距离坐标原点-161mm; 6r:?;j~l jw}}^3. >gwz,{ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 dC\ZjZZ @H>@[+S# D?yG+%&9 探测器参数设定: %ek'~ cRd0S*QN2 在菜单栏中选择Create/Element Primitive /plane jn >d*9u $;M:TpX mGUO6>g @yXfBML?] <<](XgR( U7uKRv9 元件半径为20mm*20,mm,距离坐标原点200mm。 B+C);WQ, Uy
? 光源创建: ,lA.C%4au~ 6
5y+Z 光源类型选择为任意平面,光源半角设定为15度。 ;$Y4xM`=m )irRO 8 #_Z$2L"U 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 Uw,2}yR OouPj@r 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 P&m\1W( R8rfM?"W cLPkK3O\= 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 8:BIbmtt5 g;$Xq)Dd 创建分析面: 'XY`(3q oAWzYu(v 8Og_W8 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。 '>$]{vQ3 Y]]}*8 C2Xd?d 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。 \AL
f$88>@ \#o2\!@` FRED在探测器上穿过多个像素点迭代来创建热图 _k8A$s<d `n$5+a+ FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 p.+ho~sC,. 将如下的代码放置在树形文件夹 Embedded Scripts, it] E-^2> fDG0BNLY 1]orUF&_ 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 xss`Y,5? ^rvx!?zO 绿色字体为说明文字,
,g%&|FAP f2,jh}4 '#Language "WWB-COM" K'K2X-E 'script for calculating thermal image map +)2s-A f- 'edited rnp 4 november 2005 Y"OG@1V;8 "\0v,!@ 'declarations Ag F,aZU Dim op As T_OPERATION gTA%uRBa Dim trm As T_TRIMVOLUME JaB<EL-9r2 Dim irrad(32,32) As Double 'make consistent with sampling P!"&%d Dim temp As Double \:'%9 x Dim emiss As Double J'N!Omz Dim fname As String, fullfilepath As String [D*UT#FM H[DUZ,J 'Option Explicit r}uz7}z %" ,V*%V; Sub Main PJ='tJDj 'USER INPUTS Oft4-4$E nx = 31 n_3O-X( ny = 31 1"pw numRays = 1000 tv!_e$CR minWave = 7 'microns 5|jw^s7 maxWave = 11 'microns XJLQ{ sigma = 5.67e-14 'watts/mm^2/deg k^4 $95h2oXt fname = "teapotimage.dat" Qg6W5Hc .BFYY13H Print "" h6} lpd Print "THERMAL IMAGE CALCULATION" <{~6}6o F <hJp,q9 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 `'V4PUe XS$OyW_Q Print "found detector array at node " & detnode 7O,U?p 4wrk2x[ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 hAHq\ 6M13f@v Print "found differential detector area at node " & srcnode 2(/g} 8T(e.I GetTrimVolume detnode, trm LVJxn2x6 detx = trm.xSemiApe /="~gq@ dety = trm.ySemiApe QR1{ w'c area = 4 * detx * dety Ot]Ru,y->+ Print "detector array semiaperture dimensions are " & detx & " by " & dety To?W?s Print "sampling is " & nx & " by " & ny 8P=o4lO+ o tk}y8 'reset differential detector area dimensions to be consistent with sampling EY \H=@A pixelx = 2 * detx / nx cK 06]-Y pixely = 2 * dety / ny 1x[)/@.'f SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False _1U1(^) Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ?2>FdtH nxr!`^Mne 'reset the source power ;pnD0bH SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) jAud {m*T Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" /{|fyKo\? Zfyo-Wk 'zero out irradiance array QcgfBsv96 For i = 0 To ny - 1 .w]GWL For j = 0 To nx - 1 < P`u} irrad(i,j) = 0.0 )KP5WudX Next j _)\c&.p]f Next i '3?\K3S4i yrR1[aT 'main loop *6} N =Z EnableTextPrinting( False ) :rg5Kt& B9wPU1 ypos = dety + pixely / 2 vBog0KD);s For i = 0 To ny - 1 7^g&)P xpos = -detx - pixelx / 2 &B|D;|7H ypos = ypos - pixely {c
(!;U A,`8#-AX EnableTextPrinting( True ) DZ_lW Print i V
=-WYu EnableTextPrinting( False ) %?m$`9yU rfq;%C 2z|*xS'G For j = 0 To nx - 1 ?.YOI.U^ v{A
KEX* xpos = xpos + pixelx .j-IX1Sa k68F-e[i^ 'shift source `P9XqWr LockOperationUpdates srcnode, True L =8rH5 GetOperation srcnode, 1, op (<)]sp2 op.val1 = xpos ldp%{"ZZ op.val2 = ypos F}=aBV|- SetOperation srcnode, 1, op A]DTUdL LockOperationUpdates srcnode, False ndeebXw* 4 M(-xl? raytrace Lliqj1& DeleteRays =dFv/F/RW CreateSource srcnode [3@):8
TraceExisting 'draw 1n@8Kv \.3D~2cU 'radiometry n+PzA[ For k = 0 To GetEntityCount()-1 n-%s8aaVf If IsSurface( k ) Then PpgP&;z4 temp = AuxDataGetData( k, "temperature" ) VhNz8) emiss = AuxDataGetData( k, "emissivity" ) ;
k)@DX If ( temp <> 0 And emiss <> 0 ) Then Uy$)%dYfq5 ProjSolidAngleByPi = GetSurfIncidentPower( k ) 3%E74 mOcD frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) u07pq4Ly irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi IEzaK End If ,JEFGI{ rW0FA End If *;fw%PW (t4&,W_spA Next k ]X^rU`": s%W<dDINl Next j X0n~-m"m `3hSLR Next i W]5USFan EnableTextPrinting( True ) E~_]Lfs) iySRY^ 'write out file ?G-e](]^< fullfilepath = CurDir() & "\" & fname UNkCL4N Open fullfilepath For Output As #1 7=DjI ~ Print #1, "GRID " & nx & " " & ny 1SR+m>pL Print #1, "1e+308" `4~H/'%QB Print #1, pixelx & " " & pixely tz&y*e& Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 dtcIC0:[ >`%'4<I maxRow = nx - 1 $9ky{T?YG maxCol = ny - 1 uECsh2Uin For rowNum = 0 To maxRow ' begin loop over rows (constant X) >J>b>SU=- row = "" =-}[^u1 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) th&[Nt7 row = row & irrad(colNum,rowNum) & " " ' append column data to row string :M6+p'`j Next colNum ' end loop over columns n8DxB@DI /)>s##p* Print #1, row Y14W?|KOB _`pD`7:aI^ Next rowNum ' end loop over rows 6MxKl
D7kl Close #1 r!{LLc}> `2PLWo Print "File written: " & fullfilepath x4/M}%h!;B Print "All done!!" :G<E^<M\)^ End Sub b/Xbs0q BouTcC 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: PfZ+PqS Ey4z.s'-l P'O#I}Dmw< 找到Tools工具,点击Open plot files in 3D chart并找到该文件 = hN
!;7G Qx'`PNU9\ R?p00 打开后,选择二维平面图: ]Qe{e3p; iT)z_
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