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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。 F0r2=f(? "Y4glomR[ 成像示意图 f|F=)tJO 首先我们建立十字元件命名为Target /;[x3}[ 23,pVo 创建方法: myqwU`s Ho[]03 面1 : A;&YPHB 面型:plane 1,]FLsuy 材料:Air PyK!Cyq 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ab.B?bx 9HlWoHuC $e,r>tgD 辅助数据: YTTij|( 首先在第一行输入temperature :300K, 9Nx%Sdu emissivity:0.1; AGjjhbGB J~oxqw} G%zJ4W% 面2 : K)+]as 面型:plane \DBEs02 材料:Air q"DHMZB 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 19pFNg'kA ,`k6@4 b353+7"| 位置坐标:绕Z轴旋转90度, Hi/[ n\<7`, "68X+! 辅助数据: PX2b(fR8_O #Q-#7|0& 首先在第一行输入temperature :300K,emissivity: 0.1; @#-\BQ; =YfzB!ld 'O.f}m SS Target 元件距离坐标原点-161mm; wi+L4v !y>up+cRjl h+&iWb3; 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 H Vhd#Q; '|), ? iVf7;M8O 探测器参数设定: f1elzANy ?~.:C' 在菜单栏中选择Create/Element Primitive /plane 0E,QOF{o {.[EX MX JRZp'Ln gu~R4@3 mW+5I-~ k'PvQl"I 元件半径为20mm*20,mm,距离坐标原点200mm。 >H5t,FfQL C]l)Pz$ 光源创建: ;T8(byH ? R#8cOmZ 光源类型选择为任意平面,光源半角设定为15度。 ) j&khHD *QIYq H+]h+K9\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。 s,!vBSn8 ST~YO 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。 %g89eaEZ Ex|Z@~T12
NXDkGO/* 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。 2QEH!)lvr DHuvHK0# 创建分析面: ["Tro;K# :RJo#ape 3 |LRb/| 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。 dTu*%S1Z T<b*=i :A:7^jrhi 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。 *qAG0EM| =h
+SZXe<r FRED在探测器上穿过多个像素点迭代来创建热图 m|x_++3 f8=qnY2j 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。 W/ WP }QM 将如下的代码放置在树形文件夹 Embedded Scripts, MU2kA&LH m .(\u?J #R31VQwK5 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。 T /IX(b'< 2EN}"Du]mj 绿色字体为说明文字, {hN<Ot &y|Ps eH" '#Language "WWB-COM" ycki0&n3 'script for calculating thermal image map 8'bZR] 'edited rnp 4 november 2005 U 0~BcFpD bi+g=cS 'declarations Eyk:pnKJb Dim op As T_OPERATION BD}%RTeWKq Dim trm As T_TRIMVOLUME *P]]7DR Dim irrad(32,32) As Double 'make consistent with sampling J(maJuY Dim temp As Double w`+-xT% Dim emiss As Double ) R5j?6}xF Dim fname As String, fullfilepath As String ]q[(z Nge@8 'Option Explicit Z)=S>06X Q k\*?<g Sub Main D)l\zs%ie 'USER INPUTS |22vNt_ nx = 31 !O}e)t ny = 31
cC| numRays = 1000 4b`Fi@J\ minWave = 7 'microns c+T`X?.j maxWave = 11 'microns Lc[TIX sigma = 5.67e-14 'watts/mm^2/deg k^4 G/fBeK$. fname = "teapotimage.dat" F^%\AA]8 Xo[cpcV Print "" m^m=/'<+ Print "THERMAL IMAGE CALCULATION" C2=PGq k{b|w') detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 +%KkzdS' h)j#?\KYm9 Print "found detector array at node " & detnode (18ZEKk 99By.+~pX srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ]GCw3r(! C"0
VOb Print "found differential detector area at node " & srcnode n_LK8 G?\eO&QG{" GetTrimVolume detnode, trm sKR%YK
"A detx = trm.xSemiApe ,3MHZPJ?k] dety = trm.ySemiApe 3$:F/H area = 4 * detx * dety "iX\U'` Print "detector array semiaperture dimensions are " & detx & " by " & dety K^tc]ZQ Print "sampling is " & nx & " by " & ny /YJBRU2 )^4Ljb1 'reset differential detector area dimensions to be consistent with sampling <&O*'
<6C pixelx = 2 * detx / nx mJ5%+.V pixely = 2 * dety / ny q(hBqU W SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False T\6,@7 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 1{d;Ngx PvjZoF[" 'reset the source power q *Hg-J} SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 5[)#3vY Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" fz|_c*&64 $dK430_B
'zero out irradiance array O&;d8 2IA{ For i = 0 To ny - 1 c~OPH
0, For j = 0 To nx - 1 D0kz;X irrad(i,j) = 0.0 8*{jxN'M Next j wmXI8'~F& Next i QkHG`yW i1KjQ1\a + 'main loop c>3? T^= EnableTextPrinting( False ) J]S30&? ~7g$TAe{ ypos = dety + pixely / 2 l7VTuVGUJ For i = 0 To ny - 1 #<sK3 PT xpos = -detx - pixelx / 2 V\r{6-%XiW ypos = ypos - pixely 2$!,$J-<Y QOrMz`OA EnableTextPrinting( True ) VnB HQ.C Print i 3c wBPqH EnableTextPrinting( False ) `r3 klL,W' Cd]A1<6s 2Kr>93O For j = 0 To nx - 1 R ;A8y KQ81Oxu*C xpos = xpos + pixelx o~"Y_dLsW eK*oV}U-k 'shift source 4/mz>eK" LockOperationUpdates srcnode, True qIQ
61>< GetOperation srcnode, 1, op O#O"]A op.val1 = xpos B|$o.$5 op.val2 = ypos 7j&EQm5\9 SetOperation srcnode, 1, op ;E.f% LockOperationUpdates srcnode, False s] ;P< -m>3@"q 'raytrace \awkt!Wa DeleteRays *f>\X[wN CreateSource srcnode S&]r6ss TraceExisting 'draw Ct~j/. V,'_BUl+x 'radiometry }oSgx For k = 0 To GetEntityCount()-1 g&EK^q If IsSurface( k ) Then @)[8m8paV temp = AuxDataGetData( k, "temperature" ) P{_%p<:V emiss = AuxDataGetData( k, "emissivity" ) ~%M*@fm If ( temp <> 0 And emiss <> 0 ) Then &N6[*7 ProjSolidAngleByPi = GetSurfIncidentPower( k ) 8JF<SQ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) wpi$-i` irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi _FcTY5."S End If (3!6nQj-t |_7k*:#q: End If (&r`
l&0 "%a<+D Next k $o\z4_I CQa8I2VF
( Next j r%ebC 7gB?rJHV, Next i J=: \b EnableTextPrinting( True ) bqA`oRb\ Kr1Y3[iNv 'write out file 4E2/?3D fullfilepath = CurDir() & "\" & fname fR {_P Open fullfilepath For Output As #1 UQ7]hX9 Print #1, "GRID " & nx & " " & ny a8ouk7G Print #1, "1e+308" 3RvDX p Print #1, pixelx & " " & pixely ElDeXLr' Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 w{2CV\^>5 .j^BWr maxRow = nx - 1 mD&I6F[s maxCol = ny - 1 S^p^)
fAmF For rowNum = 0 To maxRow ' begin loop over rows (constant X) 8Lx1XbwK row = "" $M!iQ"bb For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) /3SEu(d! row = row & irrad(colNum,rowNum) & " " ' append column data to row string (y&sUc9 Next colNum ' end loop over columns N|>JLZ> }mIN)o Print #1, row 9Oq(` 4 >$-YNZA Next rowNum ' end loop over rows hAc|a9 o Close #1 U] GD6q Jp}\@T. Print "File written: " & fullfilepath ?nbu`K6T Print "All done!!" 5G(dvM-n End Sub )1Y?S; h!|U j 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: ;fW~Gb?" bolG3Tf| ;s3\Z^h4kd 找到Tools工具,点击Open plot files in 3D chart并找到该文件 hwL`9.w 8Yf*vp>T/x jn(!6\n" 打开后,选择二维平面图: ZS(%!+ M 2\z|/
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