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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。 rsBF\(3b~ iJ42` 51 成像示意图 RUf,)]Vvk 首先我们建立十字元件命名为Target ./kmI#gaV R8EDJ2u# 创建方法: @SPmb o W#e:r z8= 面1 : 6`NsX 面型:plane T7m rOp 材料:Air )ty
*_@N0 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 51`w.ri 9^0 'VRG ( NjX?^ 辅助数据: yN{Ybp 首先在第一行输入temperature :300K, [KWF7GQi emissivity:0.1; [lS'GszA aEXV^5;,pJ tRbZ^5x\@ 面2 : 1|/2%IDUI 面型:plane ""Drf=] 材料:Air }y|%wym 孔径:X=1.5, Y=6,Z=0.075,形状选择Box XT>e/x9' BOL_kp" $0LlaN@e 位置坐标:绕Z轴旋转90度, A40 -])'! 'P@a_*I t8GJ; 辅助数据: `<HY$PAe Btpx[T 首先在第一行输入temperature :300K,emissivity: 0.1; ,wO5IaV Km+29 m{%_5 nW Target 元件距离坐标原点-161mm; J)(]cW. DLS-WL rUlpo|B 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Syp|s3u; [n74&EH <@*mFq0 , 探测器参数设定:
C&e ,z%F="@b9 在菜单栏中选择Create/Element Primitive /plane mqsf#'ri *tRJ= s
]QzNc s\7|b:y& 0QC*Z ( .)cOu> 元件半径为20mm*20,mm,距离坐标原点200mm。 =[1W.Zt WR'A%"qBwi 光源创建: }=f}@JlFB [&{"1Z 光源类型选择为任意平面,光源半角设定为15度。 WM@uxe, `=-}S+ X/7: * 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。 B.Xm*adBT 2tWUBt\,g 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。 Do_L Z@I%ppd 40g&zU- 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。 x,7axx6 D^&! 创建分析面: (4g;-*N qtgK}*9ptv aY {. 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>EIDRLJ- s?`)[K'- #;mZ3[+i5 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。 ZVGw@3 jG.*tuf FRED在探测器上穿过多个像素点迭代来创建热图 Sl$dXB@ ?QuFRl,ZJ FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 zJ9,iJyuD 将如下的代码放置在树形文件夹 Embedded Scripts, yTDoS|B+) omRd'\ RO kb%W3c9HO 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 5 ;|9bWH V_
]4UE 绿色字体为说明文字, %^5$=w Me`"@{r|# '#Language "WWB-COM" 9J|YP}% 'script for calculating thermal image map \2+xMv)8 'edited rnp 4 november 2005 g{D&|qWj lN1zfM 'declarations 7=<PVJ*/ Dim op As T_OPERATION D8dTw {C Dim trm As T_TRIMVOLUME VJ$C)0xQA Dim irrad(32,32) As Double 'make consistent with sampling aIfog+Lp Dim temp As Double {:oZ&y)Ac Dim emiss As Double M,#t7~t Dim fname As String, fullfilepath As String ,\qo }6S4yepl 'Option Explicit l y%**iN f0[xMn0Tu Sub Main .(Pe1pe 'USER INPUTS C>MoR 3] nx = 31 7}lZa~/ ny = 31 4]+ ^K` numRays = 1000 \E#r[9F{ minWave = 7 'microns 4sJx_Qi maxWave = 11 'microns ,v6Jr3 sigma = 5.67e-14 'watts/mm^2/deg k^4 Wh<lmC50( fname = "teapotimage.dat" O%)9tFT tL).f:? Print "" siG?Sd_2 Print "THERMAL IMAGE CALCULATION" NrU-%!Aw _cJ{fYwYU detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 T,IV)aq nAX|=qp# Print "found detector array at node " & detnode yf8UfB#a -w2ga1 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 8bysg9H0 ,AD| u_pP Print "found differential detector area at node " & srcnode fwnpmuJ UMX+h])#N GetTrimVolume detnode, trm q#778 detx = trm.xSemiApe tFSdi.|G= dety = trm.ySemiApe K;97/"
area = 4 * detx * dety y$&a(S] Print "detector array semiaperture dimensions are " & detx & " by " & dety 5\'%zZ, l Print "sampling is " & nx & " by " & ny q+:(@w6 FlgB-qR]<n 'reset differential detector area dimensions to be consistent with sampling FvNO*'xP pixelx = 2 * detx / nx 'LOqGpmVc pixely = 2 * dety / ny C0fA3y72 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ljis3{kn"" Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 C[KU~@ 2lSM`cw 'reset the source power Pz)QOrrG~ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) #wd \& Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" B~aOs>1
S] x2B"%3th0 'zero out irradiance array ]q3Kd{B For i = 0 To ny - 1 ?rOb?cu- For j = 0 To nx - 1 6P~"7k irrad(i,j) = 0.0 [!q&r(-K Next j qB39\j Next i MUe'xK Q)@1:(V/ 'main loop B5cyX*! ? EnableTextPrinting( False ) |)4$\<d 8k1r|s@d ypos = dety + pixely / 2 "^=[*i For i = 0 To ny - 1 A{J 1 n xpos = -detx - pixelx / 2 0C p} ypos = ypos - pixely Fa!)$eb7 mce`1Tjw EnableTextPrinting( True ) 55cldo Print i ,%'0e/ EnableTextPrinting( False ) mc+wRx
ke#;1 L@_">'pR For j = 0 To nx - 1 /C:'qhY, 5Hm!5:ZB xpos = xpos + pixelx `eWcp^| j~E +6f\ 'shift source ?iLd5 Z LockOperationUpdates srcnode, True ]18ygqt GetOperation srcnode, 1, op cORM R! op.val1 = xpos H|)1T-% op.val2 = ypos 5y3TlR SetOperation srcnode, 1, op mo,l`UL LockOperationUpdates srcnode, False P\mm8s`f W^ :/0WR 'raytrace oyt//SE DeleteRays a-E-hX2 CreateSource srcnode 9f^PR|F TraceExisting 'draw $vLV<
y07 |3s&Y`x-D 'radiometry AMd)d^; For k = 0 To GetEntityCount()-1 `zp2;]W If IsSurface( k ) Then NN 6KLbC( temp = AuxDataGetData( k, "temperature" ) E.`dk. emiss = AuxDataGetData( k, "emissivity" ) $uw+^(ut If ( temp <> 0 And emiss <> 0 ) Then LZ)m](+M ProjSolidAngleByPi = GetSurfIncidentPower( k ) l>UUaf|O frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) e^NEj1 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi eM+;x\jo? End If D w=Z_+J H 1D;:n End If ?GNF=#=M z>33O5U Next k "-n%874IT EO&ACG Next j H~|%vjH eqZ+no Next i nbASpa( EnableTextPrinting( True ) -t6R!ZI jN%p5nZ^EK 'write out file 2rCY&8 fullfilepath = CurDir() & "\" & fname KKjxg7{K Open fullfilepath For Output As #1 ^dnz=FB Print #1, "GRID " & nx & " " & ny 8RAeJ~e Print #1, "1e+308" H@MFj>~ Print #1, pixelx & " " & pixely cN WcNMm Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 N4H+_g| Dw`m>'J0 maxRow = nx - 1 q Iy^N:C2' maxCol = ny - 1 d%lHa??/h For rowNum = 0 To maxRow ' begin loop over rows (constant X) U>_IYT
row = "" l^!A For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) i6md fp|k row = row & irrad(colNum,rowNum) & " " ' append column data to row string ?JgO-. Next colNum ' end loop over columns aw/7Z` FGwnESCC Print #1, row #<wpSs 9c6GYWIFt& Next rowNum ' end loop over rows A6N~UV*_ Close #1 '}Wu3X |[Ie.&) Print "File written: " & fullfilepath *NW QmC~ Print "All done!!" ^.#X<8hr End Sub @?Gw|bP O wA~( 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: vK6ibl0 xegQRc bEBBwv 找到Tools工具,点击Open plot files in 3D chart并找到该文件 S\9t4Ki_' b0YiQjS6> 3e%l8@R@ 打开后,选择二维平面图: Or+*q91j (/U)>%n
QQ:2987619807 ahNX/3;y
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