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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。 {yXpBS =$kSvCjP 成像示意图 pBo=omQV 首先我们建立十字元件命名为Target o$PY0~# rQE:rVKVh 创建方法: SSCyq#dl$ ,2yIKPWk 面1 : IR_&dWHyc 面型:plane 10?+6*d 材料:Air 2%!yV~Z 孔径:X=1.5, Y=6,Z=0.075,形状选择Box PBkTI2 v 3MqyHOOv o8uak*"{ 辅助数据: 4i]h0_] 首先在第一行输入temperature :300K,
r Uau?? emissivity:0.1; &YiUhK tfz"9PV80 TwdY6E3` 面2 : 5/w4[d 面型:plane $"e$#<g 材料:Air (U`<r-n\n 孔径:X=1.5, Y=6,Z=0.075,形状选择Box zDD Ms>CO7Nvy -l(G"]tRB 位置坐标:绕Z轴旋转90度, M9C
v00& zG^|W8um_ $?Dcp^ 辅助数据: L!| `IK obzdH:S 首先在第一行输入temperature :300K,emissivity: 0.1; f;{K+\T )
dB?Ep| 5MX7V4ist Target 元件距离坐标原点-161mm; ro}WBv DH9p1)L' c^F@9{I 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 P7`RAz %4$J.6M vV
PK 探测器参数设定: >~}}*yp H`T8ydNXa 在菜单栏中选择Create/Element Primitive /plane j|-{*t{/x &P pb2 Pl/B#Sbf' |U:VkiKt yg WwUpY K^m`3N" 元件半径为20mm*20,mm,距离坐标原点200mm。 ]39])ul /ka "YU 光源创建: nN'>>'@> 4R}$P1 E 光源类型选择为任意平面,光源半角设定为15度。 &iTTal.6 boeIO\2}P0 y F;KyY{ 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 zqCr'$ ,>3b|-C- 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!/ *(TT eW\C@>Ke J;5G]$s 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 :"Gd;~p. Ue&I]/?;$ 创建分析面: pP)> x*1 SO+J5,)HA j
V'~> 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。 2{A/Fbk lz:+y/+1 FIN0~
8 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。 tSX,*cz R+<M"LriR& FRED在探测器上穿过多个像素点迭代来创建热图 ~Q2,~9Dkc '>Uip+' 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。 }JM02R~I 将如下的代码放置在树形文件夹 Embedded Scripts, H=@S+4_bK T]lVwj ]L;X Aj? 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。 #XeEpdE -~TgA*_5] 绿色字体为说明文字, jc7NYoT: oV;I8;#\J '#Language "WWB-COM" F3=iyiz6 'script for calculating thermal image map /g\m7m)u 'edited rnp 4 november 2005 0czEA w=x
[=O 'declarations 5
8n(fdE Dim op As T_OPERATION *kq>Z 06'i Dim trm As T_TRIMVOLUME yIf>8ed]# Dim irrad(32,32) As Double 'make consistent with sampling X8~gLdv8 Dim temp As Double %Hpz^<` Dim emiss As Double 8C4v Dim fname As String, fullfilepath As String KY9&Ky+2 B ~PA6e+gmL 'Option Explicit s}Q*zy TIVrbO\!o Sub Main $@eFSA5k,7 'USER INPUTS *GC9o/ nx = 31 ~IS3i'bh ny = 31 ]GmXZi numRays = 1000 QvDD
minWave = 7 'microns R zn%!d^$> maxWave = 11 'microns 2@?\"kR"! sigma = 5.67e-14 'watts/mm^2/deg k^4 o]WG8Mo- fname = "teapotimage.dat" /F_(&H!m I7HP~v~ Print "" Z:Nm9m Print "THERMAL IMAGE CALCULATION" B+n(K+ y R_x:,|g detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 S)z5=N(Xz X.)D"+xnH Print "found detector array at node " & detnode 5u^;71 1'YksuYx6f srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 $LJCup,1" k%h%mz Print "found differential detector area at node " & srcnode w<G'gi]
A9C GetTrimVolume detnode, trm Qh!h "] detx = trm.xSemiApe wf/DLAC dety = trm.ySemiApe #(o( p area = 4 * detx * dety PXDwTuyc Print "detector array semiaperture dimensions are " & detx & " by " & dety Fa9gr/.F,@ Print "sampling is " & nx & " by " & ny b(?A^a 5}he)2*uD 'reset differential detector area dimensions to be consistent with sampling {aYCrk1 pixelx = 2 * detx / nx YN($rAkL pixely = 2 * dety / ny 6^vHFJ$ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False >
@n?W" Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 )+v'@]r TptXH? 'reset the source power FX:'38-fk SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) WoX,F1 o Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" (g#,AX P'p5-l UK 'zero out irradiance array r^$WX@ t& For i = 0 To ny - 1 Bw8&Amxx: For j = 0 To nx - 1 @DK;i_i irrad(i,j) = 0.0 7 J+cs^2 Next j Y|y X]\, Next i D$PR<>=y [;8vO=Z 'main loop N[8y+2SZ EnableTextPrinting( False ) p'`pO"EO Fc.1)yh. ypos = dety + pixely / 2 Sp^jC
Xu For i = 0 To ny - 1 z\r|5Z xpos = -detx - pixelx / 2 .qG*$W2f ypos = ypos - pixely `6`oLu\l us3fBY' EnableTextPrinting( True ) 3FpS o+ Print i $][$ e EnableTextPrinting( False ) (#%R'9Rv U8s&5~IPn ju%t'u\' For j = 0 To nx - 1 PXJ`<XM 84UI)nE:Q xpos = xpos + pixelx 0Rze9od]$ v|K<3@J 'shift source #E#.`/4 LockOperationUpdates srcnode, True @N,I}_ 9- GetOperation srcnode, 1, op #Hy fjj op.val1 = xpos _/%,ZoZ2 op.val2 = ypos 'q9='TOk SetOperation srcnode, 1, op cri.kr9Y LockOperationUpdates srcnode, False zMW[Xx! GUqhm$6a raytrace N>'|fNx] DeleteRays d:1TSJff%/ CreateSource srcnode _;yi/)-2 TraceExisting 'draw dLIZ)16& 6pi^ rpo 'radiometry E]26a,^L For k = 0 To GetEntityCount()-1 QwL'5ws{q If IsSurface( k ) Then K%/:V temp = AuxDataGetData( k, "temperature" ) X`E3lgfqT emiss = AuxDataGetData( k, "emissivity" ) WG?;Z If ( temp <> 0 And emiss <> 0 ) Then r7=r~3) ProjSolidAngleByPi = GetSurfIncidentPower( k ) N&'05uWY} frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) aO]FQ#l2b irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi A/+bwCDP End If @5y ~A}Vd G,6Zy-Y9 End If JSOgq/\ ;zc,vs Next k dDoKmuY>5 Hjtn*^fo^ Next j (@y te 5v@-.p Next i |rg4j EnableTextPrinting( True ) y8QJ=v* B $pOgFA1' 'write out file d:V6.7>, fullfilepath = CurDir() & "\" & fname x!@P|c1nKC Open fullfilepath For Output As #1 )^'g2gVK+p Print #1, "GRID " & nx & " " & ny rS3* k3 Print #1, "1e+308" /5Zt4&r Print #1, pixelx & " " & pixely /K2=GLl; Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 b\^q9fy ]@D#<[5\ maxRow = nx - 1 vQiKpO* maxCol = ny - 1 Q1yj+)_ For rowNum = 0 To maxRow ' begin loop over rows (constant X) w2/3\3p row = "" <.lT.>'? For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) erC )2{m row = row & irrad(colNum,rowNum) & " " ' append column data to row string ILQB%0! Next colNum ' end loop over columns |{G GATni D^~G(m;- Print #1, row _:Jra YLEa;MR Next rowNum ' end loop over rows u{_jweZ Close #1 n,E=eNc }&{z-/;H Print "File written: " & fullfilepath O5:2B\B Print "All done!!" n)'5h End Sub .h;PMY+ !y{t}|U/d 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: ;HPQhN_ S)h0@;q AM ZWPU 找到Tools工具,点击Open plot files in 3D chart并找到该文件 lwU$*?yv (pFPuV l1h;ng6 打开后,选择二维平面图: I|#1u7X%] b+ g(=z+
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