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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。 er l_Gg bmt2~! 成像示意图 ,p$1n; 首先我们建立十字元件命名为Target T=b5th} r<&d1fM;X 创建方法: z${B| De4+4& 面1 : *QjFrw3 面型:plane +Icg;m{ 材料:Air U6.$F#n 孔径:X=1.5, Y=6,Z=0.075,形状选择Box wk8XD(& 3b#KrN' I"T_< 辅助数据: #<v3G)|aS 首先在第一行输入temperature :300K, uERc\TZ emissivity:0.1; /JR*X!&" gtCd#t'(V p@r~L(>+3 面2 : s{IycTbz 面型:plane eW7;yH 材料:Air gR~XkU 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 'Ur$jW ZZl)p\r :j?Lil%R 位置坐标:绕Z轴旋转90度, v9M;W+J B[cZEFo\ q'c'rN^ 辅助数据: EVRg/{X A5?[j
QT0 首先在第一行输入temperature :300K,emissivity: 0.1; +uv]dD*i bS*
"C,b~s Mg^GN-l Target 元件距离坐标原点-161mm; E >SnH
j>?c]h{- &*MwKr<y 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 _Y}(v((; ]_F%{ 8| lm]4zs /A 探测器参数设定: qjUQ2d &IOChQ`8P 在菜单栏中选择Create/Element Primitive /plane Cd6^aFoK! 10}\7p8 Et`z7Q*e in#g =wI,H@ }1d
6d3b 元件半径为20mm*20,mm,距离坐标原点200mm。 _~5{l_v|I S
G]e^%i 光源创建: *Pw;;#\B oD~VK,. 光源类型选择为任意平面,光源半角设定为15度。
Sn" 1XU "{L%5:H@ d
t0?4 d 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。 yWt87+%T Q@/wn 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。 HPr5mWs: 0'z$"(6D ]#R;%L 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。 <\2,7K{{+; K~v"%sG{` 创建分析面: A[=)Zw
" >9Ub=tZm ~~:i+-[ 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。 J%3S3C2*m {gK
i15t 7P=1+2V 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。 J<u,Y= -~ h"]v+u`!SM FRED在探测器上穿过多个像素点迭代来创建热图 V0ulIKck f }eZX 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。 LnrR#fF]Z 将如下的代码放置在树形文件夹 Embedded Scripts, jo{GPp} s 6vsV XSn^$$S 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。 sT'wps 2 _%z)Y=Q 绿色字体为说明文字, ?<xGO@b
. 73 D|gF* '#Language "WWB-COM" v[35C]gS 'script for calculating thermal image map ]}~*uT}> 'edited rnp 4 november 2005 xREqcH,vU d!e$BiC 'declarations B.Ic8' Dim op As T_OPERATION YNHn# 98\ Dim trm As T_TRIMVOLUME U#d",s Dim irrad(32,32) As Double 'make consistent with sampling @j5W4HU Dim temp As Double 5pE[}@-c9 Dim emiss As Double )5Gzk&| Dim fname As String, fullfilepath As String D3(|bSca Ny
p5= 'Option Explicit y%`^*E& /|`;|0/2 Sub Main 8O("o7~" 'USER INPUTS zSj.Y{J nx = 31 qRTxg% ny = 31 pkjL2U: numRays = 1000 @H1pPr minWave = 7 'microns 0[);v/@Ho maxWave = 11 'microns "4&HxD8_ih sigma = 5.67e-14 'watts/mm^2/deg k^4 >umcpkp-h fname = "teapotimage.dat" V,*YM y 3c]zDjV Print "" E/Eny5 Print "THERMAL IMAGE CALCULATION" X -w#E3 h,rGa\X~0 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 EX=+TOkAf ) ?+-Z2BwA Print "found detector array at node " & detnode dkLc"$(O Rfeiv srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ) m%ghpX 6./h0kD` Print "found differential detector area at node " & srcnode u}qfwVX Z -`&4>\o2Lx GetTrimVolume detnode, trm %Kd8ZNv detx = trm.xSemiApe LN" bGe dety = trm.ySemiApe `-qSvjX area = 4 * detx * dety Ga+\b>C Print "detector array semiaperture dimensions are " & detx & " by " & dety CZxQz
Print "sampling is " & nx & " by " & ny ]J5[ZVz >p}d:t/ 'reset differential detector area dimensions to be consistent with sampling (
y'i{:B pixelx = 2 * detx / nx "|.>pD#0& pixely = 2 * dety / ny #:DDx5%x<b SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ?b^VEp.;} Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 y%v<Cp@R UI_|VU>J 'reset the source power J<>z}L{ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) $/Zsy6q: Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" *x)WF;(]g /n/U)!tp 'zero out irradiance array FWq6e, For i = 0 To ny - 1 =}Bq"m For j = 0 To nx - 1 Ej F< lw irrad(i,j) = 0.0 )wCA8 Next j $_@~t$ Next i v}+axu/? rcF;Lp : 'main loop xAjLn*d|N EnableTextPrinting( False ) G0^23j |hiYV ypos = dety + pixely / 2 `0=0IPVd For i = 0 To ny - 1 HC?yodp^ xpos = -detx - pixelx / 2 I&q:w\\z8| ypos = ypos - pixely jf$6{zO6j A\i/@x5# EnableTextPrinting( True ) G>YJ3p7 Print i 818</b<yn EnableTextPrinting( False ) 7$8z}2 " 5synfO iL/(WAB_od For j = 0 To nx - 1 HP3~.1Sp E@JxY xpos = xpos + pixelx (X)$8y ,B5Ptf# 'shift source O->i>d LockOperationUpdates srcnode, True 6IctW5b GetOperation srcnode, 1, op h<Yn0(. op.val1 = xpos \Y
Cj/tG8 op.val2 = ypos Y
H
2iV SetOperation srcnode, 1, op mkk74NY LockOperationUpdates srcnode, False o~NeS|a HdJLD+k/ raytrace zt[TShD^ DeleteRays PJAE~|a CreateSource srcnode 6mep|![6 TraceExisting 'draw P>)-uLc~W /raM\EyrlP 'radiometry SR*%-JbA For k = 0 To GetEntityCount()-1 N>/*)Frt If IsSurface( k ) Then kZU8s'C temp = AuxDataGetData( k, "temperature" ) (|'w$ emiss = AuxDataGetData( k, "emissivity" ) %,K |v If ( temp <> 0 And emiss <> 0 ) Then (e=ksah3> ProjSolidAngleByPi = GetSurfIncidentPower( k ) V*=cNj frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) "<v_fF<Y irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi } <2F]UuR End If !V+5$TsS KjZ^\lq' End If pvI(hjMYPk ?OZbns~ Next k _8 vxb MeQ(,irr^ Next j r?{Vqephz cuq7eMG6z Next i @tEVgyN EnableTextPrinting( True ) R>/M>*C }ebw1G 'write out file |GdA0y\v*} fullfilepath = CurDir() & "\" & fname w?jmi~6 Open fullfilepath For Output As #1 g#9w5Q Print #1, "GRID " & nx & " " & ny Pu/0< |