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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。 Wg8*;dvtM :3J`+V}9; 成像示意图 C8}=fa3u 首先我们建立十字元件命名为Target Imyw-8/; X76rme 创建方法: %j{*`} * <?KOM 面1 : XB:E<I'q!3 面型:plane }?O>.W,/ 材料:Air ltkA7dUbu 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 9o]!D,u8=5 }wJH@'0+ 1:u~T@;" ` 辅助数据: gh `_{l
首先在第一行输入temperature :300K, E%Ko[G emissivity:0.1; SaRn>n\ vo~Qo;m )2u_[Jc= 面2 : e. E$Ej]w 面型:plane 3J3wKw!` 材料:Air 9c5DEq 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 6\y?+H1 xsvJjs;= KR%NgV+}!0 位置坐标:绕Z轴旋转90度, [8 23w.{]# :01B)~^ 3b`#)y^y?% 辅助数据: "=$uv bJeF1LjS 首先在第一行输入temperature :300K,emissivity: 0.1; >yLdrf ;D%H}+Z 3S%/>)k Target 元件距离坐标原点-161mm; wX
<ov0?[ i|S/g.r F9r|EU#; 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 N~?(<DyZR bJynUZ }"/>, 探测器参数设定: ~ET XXu${I w(*}, 在菜单栏中选择Create/Element Primitive /plane a?X@ D<.; 1DH P5q 3,Iu!KB ]7q|) S\ r=]$>& O6">Io5 元件半径为20mm*20,mm,距离坐标原点200mm。 xA0=C \GK]6VW 光源创建: P\@efq@! X"jtPYCpV{ 光源类型选择为任意平面,光源半角设定为15度。 @R`Ao9n9V <EY{goW =t.T9'{ 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。 L9!\\U wb39s^n 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。 xE*.,:,& EbJc%%c tNYuuC%N 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。 "cvhx/\1# z0&Y_Up+5 创建分析面: +{%)}?F iUZV-jl2/ RQ 8;_)% 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。 v"_E0
3! e^N}(Kpy 0u
+_D8G 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。 m@",Zr`f= {9cjitl FRED在探测器上穿过多个像素点迭代来创建热图 %Vk77( P]2V~I/X 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。 5!Ovd
O}g 将如下的代码放置在树形文件夹 Embedded Scripts, h&rZR`g 'k[vcnSz\/ 7}pg7EF3z 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。 x]IJ; &7r a 绿色字体为说明文字, }:!X@C~ a.a
,_ '#Language "WWB-COM" W<$!H
V$ 'script for calculating thermal image map cNye@}$lu 'edited rnp 4 november 2005 {TDZDH Zb:Z,O(vn 'declarations ^zfs8]QSf Dim op As T_OPERATION ~_wSB[z Dim trm As T_TRIMVOLUME 7j88^59 Dim irrad(32,32) As Double 'make consistent with sampling d)d0,fi?- Dim temp As Double h-DHIk3/ Dim emiss As Double dk 0} q6~ Dim fname As String, fullfilepath As String 'LR|DS[Ne >Sb3]$$ 'Option Explicit pm[+xM9PB \m=k~Cf:f Sub Main vhDtjf/* 'USER INPUTS }]=@Y/p nx = 31 N*)O_Ki ny = 31 (k_9<Yb3 numRays = 1000 TIK'A< minWave = 7 'microns hS&.-5v maxWave = 11 'microns e\!Aoky sigma = 5.67e-14 'watts/mm^2/deg k^4 ,hm&] fname = "teapotimage.dat" 5qFHy[IA 4[)tO-v:Y Print ""
{BgJ=0g? Print "THERMAL IMAGE CALCULATION" ph~BxK )i6 l(\F2_,2W detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ` $q0fTz tq51;L Print "found detector array at node " & detnode I+31:#d s'bTP(wl9 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 p1W6 s0L Y~?Z'uR Print "found differential detector area at node " & srcnode $EzWUt PKQ.gPu6*@ GetTrimVolume detnode, trm <(H<*Xf9 detx = trm.xSemiApe ^F&j;8U dety = trm.ySemiApe ~YByyJG
area = 4 * detx * dety hD4>mpk Print "detector array semiaperture dimensions are " & detx & " by " & dety n~ 0MhE0H Print "sampling is " & nx & " by " & ny 7k00lKA\w 3[8p,wx 'reset differential detector area dimensions to be consistent with sampling B:Awy/XMi pixelx = 2 * detx / nx lQy-&d|=#^ pixely = 2 * dety / ny M27H{}v SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 2\;/mQI2A Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 /y6I I$AvM Sh?eb 'reset the source power T|0d2aa SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Ijk hV Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" H!>>|6OPF ~Yc!~Rz 'zero out irradiance array N(2M
w:} For i = 0 To ny - 1 &gUa^5'# For j = 0 To nx - 1 e1%kW1Z9 irrad(i,j) = 0.0 kt=&mq/B Next j 0Ue~dVrM(? Next i z4;@"B p}5413z5Z= 'main loop L\t_zf_0 EnableTextPrinting( False ) |o'r?" j(k}NWPH ypos = dety + pixely / 2 z;ku*IV For i = 0 To ny - 1 ,eWLig
xpos = -detx - pixelx / 2 DIJmISk ypos = ypos - pixely @th94tk, drk BW}_ EnableTextPrinting( True ) <0 qhc$M Print i ;8^(Z EnableTextPrinting( False ) \9uK^oS pM}~/ >#Xz~xI/I For j = 0 To nx - 1 F^`+.G\ ael] {'h] xpos = xpos + pixelx 9!kp3x/` <q>d@Foi 'shift source `S.I,<& LockOperationUpdates srcnode, True /Ov1eQBNG GetOperation srcnode, 1, op M"bG(a(6: op.val1 = xpos =Y5m% ,Bq op.val2 = ypos "z;R"sv\ SetOperation srcnode, 1, op 9NNXj^7 LockOperationUpdates srcnode, False t\TxK7i _N)&<'lB< raytrace `w`F-ke]I DeleteRays l2}X\N&q CreateSource srcnode )!caOGvhJ TraceExisting 'draw {cb<9Fii Jb^{o+s53 'radiometry 6(uZn= For k = 0 To GetEntityCount()-1 e9tb]sAG If IsSurface( k ) Then /oLY\>pD temp = AuxDataGetData( k, "temperature" ) Nu\<Xr8 emiss = AuxDataGetData( k, "emissivity" ) z[myf]@ If ( temp <> 0 And emiss <> 0 ) Then /y6f~F ProjSolidAngleByPi = GetSurfIncidentPower( k ) ,D]g]#Lq frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ?u/UV,";y irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi D.|r
[c End If #NYHwO<0- }L&LtW{X End If }/,Rp/+7] VaGQre Next k nc\2A>f` G%AO%II Next j 9I;~P & [u37Hy_Gi Next i s{8=Q0^ EnableTextPrinting( True ) EtaKo}!A} eU,FYJt9 'write out file &/ED.K fullfilepath = CurDir() & "\" & fname yT5OFD|T Open fullfilepath For Output As #1 NO@`*:.^Y Print #1, "GRID " & nx & " " & ny R5%CK_ Print #1, "1e+308" sR[!6[AA Print #1, pixelx & " " & pixely X1o^MMpz(F Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 |WEl5 bNc3 G%;>_E maxRow = nx - 1 LHXR7Fjc maxCol = ny - 1 =QbOvIq For rowNum = 0 To maxRow ' begin loop over rows (constant X) Y_n3O@, row = "" hITYBPqRO For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) k?TZY|_ row = row & irrad(colNum,rowNum) & " " ' append column data to row string x[Hx.G}5+ Next colNum ' end loop over columns FfrC/"N &vt)7[ Print #1, row /3K)$Er 6M_:D Next rowNum ' end loop over rows :z&kbG Close #1 v'b%m8 P=KhR&gwV~ Print "File written: " & fullfilepath X0-PJ-\aD@ Print "All done!!" *w O~RnP End Sub }^$1<GT ;UM(y@ 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: 5pe)CjE: D GcpYA.7' ;<B 找到Tools工具,点击Open plot files in 3D chart并找到该文件 qsbV)c EU%v
|] s-+-?$K 打开后,选择二维平面图: C;K+ITlJ sxph#E%
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