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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。 TETfRnm 37V$Qb_ 成像示意图 ADMeOdgca 首先我们建立十字元件命名为Target %H}M[_f HS1{4/ 创建方法: !'>#!S~h3 g](&H$g 面1 : ^Je*k)COn 面型:plane )F0Q2P1I 材料:Air U/7jK40 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 0+A#k7c6p LI"N^K'z eE{
2{C 辅助数据: q z!^<
M 首先在第一行输入temperature :300K, 26j-1c!NGd emissivity:0.1; ~Oi.bP<, !Z; Nv ;[|+tO_ 面2 : *Ym+xu_5 面型:plane hiWs:Yq 材料:Air %<h2^H\O 孔径:X=1.5, Y=6,Z=0.075,形状选择Box gOaK7A zaE!=-U **ls 4CE< 位置坐标:绕Z轴旋转90度, GVdJ&d\x Q2!RFtXV u5,vchZ 辅助数据: vE~<R 73!])!SVI 首先在第一行输入temperature :300K,emissivity: 0.1; (. ,{x)H .GW)"`HbU Ej`G( Target 元件距离坐标原点-161mm; L-e6^%eU 3LVL5y7| HA0yX?f] 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 AgdU@&^ y<y9'tx B{1yMJA 探测器参数设定: McvLU+ &hzr(v~; 在菜单栏中选择Create/Element Primitive /plane o1Wf#Zq ?j}
Fxr 8sL+ik" /IC]}0kkp X|60W p vu% p8 元件半径为20mm*20,mm,距离坐标原点200mm。 z'EphL7r Aac7km 光源创建: c* )PS`]t (HeIO 光源类型选择为任意平面,光源半角设定为15度。 @h7
i;Ok #YLI"/Kn ;{g>Z| 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。 l{_1`rC' OEHw% 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。 8noo^QO TI3@/SB> !(N,tZ 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。 hHsO?([99 ?qtL*; 创建分析面: bj 0-72V 1ka58_^ <*$IZl6I 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。 4eS(dPI0 2>inyn)S $yMNdBI[ 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。 $60]RCu d^XRkB:h FRED在探测器上穿过多个像素点迭代来创建热图 |JCn=v@ U9q6m3#$ 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。 :D=y<n;S+ 将如下的代码放置在树形文件夹 Embedded Scripts, RSf*[2 y1Yrf,E
m= .A<n2- 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。 0I>[rxal P vS\ 绿色字体为说明文字, Z`'&yG;U P.]O8r '#Language "WWB-COM" `"j _] 'script for calculating thermal image map MY>o8A 'edited rnp 4 november 2005
<:`x> _ ixo?o]Xb` 'declarations EeS VY Dim op As T_OPERATION Jgf=yri Dim trm As T_TRIMVOLUME </7?puVR Dim irrad(32,32) As Double 'make consistent with sampling n6
AP6PK7 Dim temp As Double UmA'aq Dim emiss As Double a(eUdGJ Dim fname As String, fullfilepath As String 1V 2"sE ;S^7Q5- 'Option Explicit jX{t/8v/s4 GAcU8MD Sub Main 8E\6RjM 'USER INPUTS lnRbvulH nx = 31 ik|iAWy ny = 31 8w4cqr4m numRays = 1000 iY4FOt7\ minWave = 7 'microns \BxE0GGky maxWave = 11 'microns _#6ekl|% sigma = 5.67e-14 'watts/mm^2/deg k^4 {!7 ^w fname = "teapotimage.dat" C<\O;-nHH L\H,cimN Print "" EU-=\Y Print "THERMAL IMAGE CALCULATION" qUF}rlS=r *ZA.O detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 IH0qx_;P& [#6Eax,j Print "found detector array at node " & detnode vOYG&)Jm gdyP,zMD7 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ^ G(GjW8 MUU9IMFJ Print "found differential detector area at node " & srcnode &B5@\Hd; ! <xe Ao%8 GetTrimVolume detnode, trm #97w6,P+ detx = trm.xSemiApe y9L:2f\ dety = trm.ySemiApe rZv5>aEI area = 4 * detx * dety :3Hr:~ Print "detector array semiaperture dimensions are " & detx & " by " & dety X"qC&oZmf Print "sampling is " & nx & " by " & ny .I&]G RtVG6'Y 'reset differential detector area dimensions to be consistent with sampling i@}/KT pixelx = 2 * detx / nx rwUKg[
1N pixely = 2 * dety / ny ?1u2P$d SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False I`e|[k2 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 Dk XB ngoAFb 'reset the source power O7z-4r SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) F7zBm53 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 71ctjU`U2 2nGQD{ 'zero out irradiance array 2|n~5\K|t For i = 0 To ny - 1 8}kY^"*&X For j = 0 To nx - 1 lC ^NhQi irrad(i,j) = 0.0 ,#PeK( Next j 8s_'tw/{ Next i JtrLTo YI*Av+Z) 'main loop hDJ84$eVZ EnableTextPrinting( False ) >1=sw
qa Gmi$Nl!~ ypos = dety + pixely / 2 E|jbbCZy2 For i = 0 To ny - 1 ;nbUbRb xpos = -detx - pixelx / 2 *VFUC: ypos = ypos - pixely /~Q2SrYH OBCRZ EnableTextPrinting( True ) v~N8H+!d Print i M#Vl{ b EnableTextPrinting( False ) `
qqUuFMM k]=Yi; @,RrAL}| For j = 0 To nx - 1 p9[J9D3~ OJUH".o xpos = xpos + pixelx \i-HECc"U G#&R/Tc5N 'shift source )r#^{{6[v LockOperationUpdates srcnode, True Ih]'OaE GetOperation srcnode, 1, op Jm|eZDp op.val1 = xpos 8Ilg[Drj* op.val2 = ypos a~_5N&~pi SetOperation srcnode, 1, op -$#' LockOperationUpdates srcnode, False u[_~ !y
9I:H=5c raytrace {[
j+y DeleteRays >900O4 CreateSource srcnode u~,@Zg87 TraceExisting 'draw ~7tG%{t% ZlHN-!OZp 'radiometry
p2;-*D For k = 0 To GetEntityCount()-1 T=|oZ If IsSurface( k ) Then fD#VI temp = AuxDataGetData( k, "temperature" ) h5-<2B| emiss = AuxDataGetData( k, "emissivity" ) YY(,H! If ( temp <> 0 And emiss <> 0 ) Then h^h!OQK Q ProjSolidAngleByPi = GetSurfIncidentPower( k ) !Qu)JR frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) QQ4
&,d irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi FfnW End If oW*e6"<R7 opK=Z End If 6e6~82t8/ }\E2Z[ Next k \lVxlc0{? F)mlCGv:R Next j 85P7I=`*d %,-oxeM1u Next i E"e <9 EnableTextPrinting( True ) IiG~l+V~ RzG<&a3B3s 'write out file
[]D@"Bz fullfilepath = CurDir() & "\" & fname |0vV?f$ Open fullfilepath For Output As #1 &<Bx1\ ~V Print #1, "GRID " & nx & " " & ny >z*2Og#1 Print #1, "1e+308" 2YD;Gb[8 Print #1, pixelx & " " & pixely 2 w2JFdm Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 Yl[GO}M 20G..>zW maxRow = nx - 1 gw0b>E8gZ& maxCol = ny - 1 D}1Z TX_ For rowNum = 0 To maxRow ' begin loop over rows (constant X) 4@D 8{?$~Q row = "" F2yc&mXyk For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) **L . !/ row = row & irrad(colNum,rowNum) & " " ' append column data to row string U$j*{`$4 Next colNum ' end loop over columns Hn%n>Bnl KXEDpr Print #1, row SG1fu<Q6J wV- kB4^4 Next rowNum ' end loop over rows -AUdBG Close #1 ?Xscc mN #F\}PCBe' Print "File written: " & fullfilepath Iy\{)+}aS Print "All done!!" oR'8|~U@B End Sub %/17K2g H tIl;E 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: 6$TE-l LMchNTL './j<2|;U 找到Tools工具,点击Open plot files in 3D chart并找到该文件 !ydJ{\; )v&r^DR_ ob=GB71j55 打开后,选择二维平面图: Np>[mNmga ?ic 7M
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