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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。 Oco YV J ]@^coj[ 成像示意图 C'A]i5 首先我们建立十字元件命名为Target wsU V;S*X% _7T@5\b:; 创建方法: xI*#(!x"G LjB;;&VCn 面1 : &PWB,BXv 面型:plane 8}e,%{q 材料:Air ,Gk}"w 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ,)!u)wz {yA$V0`N{ HO)/dZNU 辅助数据: RW$:9~ 首先在第一行输入temperature :300K, 'b*%ixa emissivity:0.1; ;Lm=dd@S: x35cW7R}T_ @4$\
5%j 面2 : +>~?m*$ 面型:plane 0c^>eq] 材料:Air 7Q w|! 孔径:X=1.5, Y=6,Z=0.075,形状选择Box G~7 i@Zs ._9
n~=! YC_5YY(k 位置坐标:绕Z轴旋转90度, aVL=K YXurYwV Mb1t:Xf^g 辅助数据: `+:.L>5([ iJ' xh n 首先在第一行输入temperature :300K,emissivity: 0.1; {gNV[45 7!y5
SX8C "P-lSF?T Target 元件距离坐标原点-161mm; 73#x|lY hI?sOR! )}vNOE?X~ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 jn >d*9u -x8nQ%X :0)3K7Q 探测器参数设定: {U<xdG `LAR@a5i 在菜单栏中选择Create/Element Primitive /plane x_Jwd^`t! 4wd&55=2 8}X5o]Mv ;w|b0V6 'Jf^`ZT} KDl_?9E5 元件半径为20mm*20,mm,距离坐标原点200mm。 ")O`mXg- Y HSYu 光源创建: 7QKr_ 8d*/HF)h 光源类型选择为任意平面,光源半角设定为15度。 5zFR7/p{ ZCKka0* wn_b[tdxq 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。 #P]#9Ty: 9% l% 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。 XNQAi (!GS }ENR{vz$A { -|{xBd 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 E0%~!b E9?phD 创建分析面: ?(*t@
{k h~{aGo H$G0`LP0/a 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。 DvvT?K ) ri}nL. VJ ^dY; 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。 2I*;A5$N1
Bs?7:kN( FRED在探测器上穿过多个像素点迭代来创建热图 5_XV%-wM &Tl
0Pf FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 zIP6\u 将如下的代码放置在树形文件夹 Embedded Scripts, pv^O"Bs '*\|;l#1 "#( T 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 ;<G=M2 ~QvqG{bFB 绿色字体为说明文字, L\y;LSTU 6s0_#wZC '#Language "WWB-COM" 5M9 I, 'script for calculating thermal image map 0b4R 'edited rnp 4 november 2005 It2" x; u,}{I}x_ 'declarations vjjSKP6B Dim op As T_OPERATION u%~igt@x Dim trm As T_TRIMVOLUME &\apwD Dim irrad(32,32) As Double 'make consistent with sampling }$bF
5& Dim temp As Double J|&JD? Dim emiss As Double dt2$`X18 Dim fname As String, fullfilepath As String y*D]Q`5cag N^B o
.U0\ 'Option Explicit ]E] 2o E;<l(.Ar Sub Main $Y5)( 'USER INPUTS +3KEzo1=) nx = 31 0P\$2lk ny = 31 detwa}h[0 numRays = 1000 UQB"v3Z minWave = 7 'microns 6oF7:lt maxWave = 11 'microns K_K5'2dE sigma = 5.67e-14 'watts/mm^2/deg k^4 <{~6}6o fname = "teapotimage.dat" %/9
EORdeH NJNJjdD> Print "" k?2k'2dy Print "THERMAL IMAGE CALCULATION" Bdj%hyW |j 6OM{@ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ]O]GeAGC2 |=&cQRY!p Print "found detector array at node " & detnode i+gQE! J/}:x;Y srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ,_"AT!r {dmj/6Lc Print "found differential detector area at node " & srcnode ?s:d[To6 PssMTEf GetTrimVolume detnode, trm c+2FC@q{l detx = trm.xSemiApe gks{\ H] dety = trm.ySemiApe /% kY0 LY area = 4 * detx * dety JGuN:c$ Print "detector array semiaperture dimensions are " & detx & " by " & dety ~i `>adJ: Print "sampling is " & nx & " by " & ny =2@B& Vb9',a?#n 'reset differential detector area dimensions to be consistent with sampling -YsLd 9^4 pixelx = 2 * detx / nx \?je Wyo pixely = 2 * dety / ny +wkjS r`e SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False D}vmwg@3 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 A]XZnQ QcgfBsv96 'reset the source power sqW*
pi SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 7U"[Gf Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" F{UP;"8' F4K0); 'zero out irradiance array 9~ l
hsH For i = 0 To ny - 1 zL\OB?)5J For j = 0 To nx - 1 |O"lNUW irrad(i,j) = 0.0 IKi5 v~bE Next j D:Zy Next i CxfRVL`7 c
9jGq 'main loop &8z[`JW,T EnableTextPrinting( False ) Ps 8%J; uV=Qp1~ ypos = dety + pixely / 2 '7oA< R For i = 0 To ny - 1 v$N|"o"" xpos = -detx - pixelx / 2 4n4?4BEn ypos = ypos - pixely 2Y7)WPn 0X^Ke(/89 EnableTextPrinting( True ) 8HP6+c% Print i _%GGl$kH EnableTextPrinting( False ) n(el]_d Ud!4"<C_
?]x|Zy For j = 0 To nx - 1 Pcw6!xH +-G<c6 | xpos = xpos + pixelx f-%NaTI !&"<oPjr+ 'shift source 4fKC 6UR LockOperationUpdates srcnode, True "70WUx(\t GetOperation srcnode, 1, op Jm42b4 op.val1 = xpos >ss/D^YS op.val2 = ypos :duo#w"K SetOperation srcnode, 1, op Yboiwy,n LockOperationUpdates srcnode, False HB7;0yt`: ]Oif|k`{ raytrace 2"B _At DeleteRays OD5m9XS CreateSource srcnode =XY\iV1J* TraceExisting 'draw g]c 6&Y,# oIefw:FE,a 'radiometry ^g`&7tX For k = 0 To GetEntityCount()-1 |gU(s If IsSurface( k ) Then }6@pJG temp = AuxDataGetData( k, "temperature" ) WoBo9aR emiss = AuxDataGetData( k, "emissivity" ) MzL1Bh!M If ( temp <> 0 And emiss <> 0 ) Then p8]68!=W\F ProjSolidAngleByPi = GetSurfIncidentPower( k ) /jRRf"B frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) *;Ed*ibf irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi B~_d^` End If EcCFbqS4W ,j$Vvz End If %b"\bHH @0SC"CqM Next k TqddOp 19j+lCSvH Next j :Cp'm'omb ?'<nx{!c Next i jb^N|zb EnableTextPrinting( True ) \xS&v7b 48*Do}l] 'write out file gwWN%Z" fullfilepath = CurDir() & "\" & fname )kkhJI*v Open fullfilepath For Output As #1 afb+GA! Print #1, "GRID " & nx & " " & ny Qu]z)";7 Print #1, "1e+308" ,Bal Print #1, pixelx & " " & pixely >J>b>SU=- Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 4- [J@ ;asP4R= maxRow = nx - 1 1)[]x9]^q' maxCol = ny - 1 z~>pVs For rowNum = 0 To maxRow ' begin loop over rows (constant X) |e2be1LD row = "" y})70w@+_ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) (bh95X row = row & irrad(colNum,rowNum) & " " ' append column data to row string 4`8< Next colNum ' end loop over columns >z.<u|r2 /*c\qXA5 Print #1, row [/BE8]M~ J|w)&bV Next rowNum ' end loop over rows `ck$t5:6sp Close #1 -P]sRl3O; h@LHRMO Print "File written: " & fullfilepath F<(i.o( Print "All done!!" *>+,(1Fz End Sub 8{Fsm;UsY HO''&hz 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: /0eYMG+K= xQ'2BAEa P:N1#|g 找到Tools工具,点击Open plot files in 3D chart并找到该文件 HuVJ\%. s$a09x !eUDi( 打开后,选择二维平面图: >~Qr RJ$7XCY%`*
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