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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。 3Gl]g/ d95N$n
成像示意图 >.hGoT!_k 首先我们建立十字元件命名为Target '<=MhNh\ lq8ko@ 创建方法: YaZt+WA r)5\3j[P 面1 : bus=LAJt= 面型:plane K2rS[Kdfaq 材料:Air h==GdS4 孔径:X=1.5, Y=6,Z=0.075,形状选择Box `O=;E`ep iB3+KR xnQGCw?S&} 辅助数据: gZEA;N:H%< 首先在第一行输入temperature :300K, !$xEX,vj|W emissivity:0.1; K}=8:BaUL y [9}[NMZ \Tf{ui 面2 : eAYW%a 面型:plane M}oj!xGB 材料:Air q AVfbcb 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 31sgf5 s FJ%R3N\ lcT+$4zk. 位置坐标:绕Z轴旋转90度, ROt0<^< 7x7r!rSe, _{`'{u
辅助数据: YeExjC fAM4Q 首先在第一行输入temperature :300K,emissivity: 0.1; Go+xL/f @j\?h$A/ 'oiD#\t4 Target 元件距离坐标原点-161mm; g.Caapy x$5nLS2. KpbZnW}g 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 &8_f'+i0 \eMYw7y5M c7l!G~yx' 探测器参数设定: (-'0g@0UA -m'3L7: 在菜单栏中选择Create/Element Primitive /plane #:vDBP05.m :YJ7J4 [5p7@6:$u KB,~u*~! BtpjQNN qtwT#z;Y 元件半径为20mm*20,mm,距离坐标原点200mm。 3^A/`8R7K >.O*gv/_ 光源创建: _KM $u>B8 ;+ Co!L 光源类型选择为任意平面,光源半角设定为15度。 YKw!pu= Gx h~ w-'D*dOi 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 3dX=xuQ%/ Ef_F#X0# 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 (|36!-(iK cJHABdK- S QM(8*:X 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 17n+4J] 5y[b8mur 创建分析面: @!&Jgg53G "doU.U&u JhhUg 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 D*XZT{1g :?$Sb8OuIL qr'x0r|<> 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。 aJy> 5!SoN}$ FRED在探测器上穿过多个像素点迭代来创建热图 ;*wT,2;
n{.*El>{ 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。 M|[@znzR< 将如下的代码放置在树形文件夹 Embedded Scripts, 409x!d~it yUD_w _>gXNS r4u 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。 +(=0CA0GE Mz/]D J8 绿色字体为说明文字, 9zoT6QP4 DnG/ n '#Language "WWB-COM" B@"SOX 'script for calculating thermal image map F=-uDtQ<N 'edited rnp 4 november 2005 Z^'?|qFj! wO2V%v^bp 'declarations F_Z&-+,*3t Dim op As T_OPERATION k9^+9P^L Dim trm As T_TRIMVOLUME -~vl+L Dim irrad(32,32) As Double 'make consistent with sampling D4=..; Dim temp As Double x9x#'H3 Dim emiss As Double /RJ6nmN@} Dim fname As String, fullfilepath As String PwFQ #Z ;NiArcAS! 'Option Explicit 1a($8> Sk6b`W7$ Sub Main "8wf.nZ 'USER INPUTS qYgwyj=4 nx = 31 [+g( ny = 31 %sO Wg.0_ numRays = 1000 a)3O? Y minWave = 7 'microns /<3;0~#){ maxWave = 11 'microns lv<iJH\
sigma = 5.67e-14 'watts/mm^2/deg k^4 2Ueq6IuQ fname = "teapotimage.dat" JCcN>DtP F[>7z3I Print "" Od0S2hHO Print "THERMAL IMAGE CALCULATION" -M7K8 p{iG{ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 "rme~w Di l^DINZU@ Print "found detector array at node " & detnode =y)p>3p}& uL2"StW srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 5x*5|8 v-P8WFjca Print "found differential detector area at node " & srcnode Q)x?B]b- ;j>*;Q` GetTrimVolume detnode, trm u~$WH, P3 detx = trm.xSemiApe Ni+3b dety = trm.ySemiApe vVI6m{zYV area = 4 * detx * dety eq^TA1>T Print "detector array semiaperture dimensions are " & detx & " by " & dety >;&Gz-lm Print "sampling is " & nx & " by " & ny ?j1_
n,d N=OS\pz 'reset differential detector area dimensions to be consistent with sampling
S304ncS|M pixelx = 2 * detx / nx EKqi+T^=F pixely = 2 * dety / ny RY9+ 9i SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Ihdu1]~R{ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 1*Sr5N[= g d z 'reset the source power "e~k-\^Y SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) M6J/mOVx5 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" RS'} nY} |r5e{ 'zero out irradiance array q\a[S* For i = 0 To ny - 1 >R( 8/#|E For j = 0 To nx - 1 D,MyI# irrad(i,j) = 0.0 Z`rK\Bc Next j JxjP@nr Next i Iph3%RaE
:bwM]k*$ 'main loop ?$3r5sx EnableTextPrinting( False ) 6^Ph ' VJ3hC[ ypos = dety + pixely / 2 +W6Hva. For i = 0 To ny - 1 ;P3>>DZ xpos = -detx - pixelx / 2 #e*X0;m ypos = ypos - pixely WNhbXyp_ lY.B EnableTextPrinting( True ) CoJ55TAW Print i xS"$g9o0 EnableTextPrinting( False ) p"KU7-BfvC nB=0T`vQ prZ55MS. For j = 0 To nx - 1 F<5nGx cC tVunh3- xpos = xpos + pixelx ;
yyO0Ha T j`y J!0 'shift source N=#4L$@- LockOperationUpdates srcnode, True 7$
d}!S GetOperation srcnode, 1, op Q!K`e )R op.val1 = xpos y?>#t^ op.val2 = ypos sAVefL? SetOperation srcnode, 1, op ,>u=gA&} LockOperationUpdates srcnode, False ob'n{T+lZ PRD_!VOW raytrace +3Y!xD?= DeleteRays +e'X; CreateSource srcnode [h4o7 TraceExisting 'draw H>.B99vp pW{8R^vKm 'radiometry %w7m\nw@ For k = 0 To GetEntityCount()-1 i&A%"lOI9 If IsSurface( k ) Then Tw//!rpG temp = AuxDataGetData( k, "temperature" ) rs:Q%V
^ emiss = AuxDataGetData( k, "emissivity" ) :M j_2 If ( temp <> 0 And emiss <> 0 ) Then }~Q5Y3]#~ ProjSolidAngleByPi = GetSurfIncidentPower( k ) noC?k }M frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) kJk xx*:u irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi W/r^ugDV End If G
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'Ti1! t+Z`n(> End If 6^;^rUlm dv7<AJ Next k J{Tq%\a3 yG&2UqX Next j DZe}y^F C c*({ Next i ?+r!z EnableTextPrinting( True ) 5h8o4 z/1{OL 'write out file We}lx{E fullfilepath = CurDir() & "\" & fname 5j eO"jB Open fullfilepath For Output As #1 WJ+>e+ Print #1, "GRID " & nx & " " & ny z<pJYpxH Print #1, "1e+308" Km3&N Print #1, pixelx & " " & pixely ([ dT!B#aH Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 3bs4mCq :EZQ'3X maxRow = nx - 1 \Hwg) Uc{ maxCol = ny - 1 \iU] s\{). For rowNum = 0 To maxRow ' begin loop over rows (constant X) hazq#J! row = "" Z0ReWrl;` For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ['[KR
BJL row = row & irrad(colNum,rowNum) & " " ' append column data to row string 8$vK5Dnn8 Next colNum ' end loop over columns o>c^aRZ{ dTGA5c Print #1, row KWhZ +i` T&xt`| Next rowNum ' end loop over rows }Qrab#v Close #1 k\N4@UK (][LQ6Pc Print "File written: " & fullfilepath :Q@)*kQH Print "All done!!" 0oU=RbC End Sub ;/LD)$_ O8|*M " 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: 1;&;5 @Bs0Avj. _+w/
pS`M 找到Tools工具,点击Open plot files in 3D chart并找到该文件 7Kf}O6nE cDV^8 R :0^s0l 打开后,选择二维平面图: ~`eHHgX Zb''mf\
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