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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。 %y)5:] *Dtwr 成像示意图 ^"7tfo8 首先我们建立十字元件命名为Target k$UgTZ Y:[WwX| 创建方法: `*cT79
Bj09?#~[ 面1 : R#i|n<x 面型:plane -fw0bL%0 材料:Air <MZ$ baK 孔径:X=1.5, Y=6,Z=0.075,形状选择Box lc>)7UF Ev* b #mlTN3 辅助数据: AN7WMX 首先在第一行输入temperature :300K, :#0uy1h emissivity:0.1; (mz5vzyw 8:;_MBt .CdaOWM7 面2 : La48M'u 面型:plane }dw`[{cm 材料:Air C`+g:qT 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Bzn{~&i?W: x^Tjs<# j89|hG)2 位置坐标:绕Z轴旋转90度, Z.Lm[$/edn @iK=1\-2 n"vl%!B 辅助数据: ^
AxU _
vVw2HH 首先在第一行输入temperature :300K,emissivity: 0.1; 0Ge*\Q :bI4HXT3 .NcoST9a Target 元件距离坐标原点-161mm; t1?e$s 0l3v>ty \s?OvqI: 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 : Q X~bq Nv "R'Pps ATCFdtNc 探测器参数设定: pA)!40kz ";}Lf1M9 在菜单栏中选择Create/Element Primitive /plane dl;~-'0 F+PIZ% s
(|T@g W/ZmG]sZE ~t[ #p: P7QOlTQI 元件半径为20mm*20,mm,距离坐标原点200mm。 <h|XB}s+ Q:eIq<erY 光源创建: H`q" _p: i3t=4[~oL 光源类型选择为任意平面,光源半角设定为15度。 8^M5k%P $'e;ScH } Uki)3( 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 r9z_8#cR txQyHQ)@ 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 c_c]0Tm 5,`U3na, wVkms 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 K y~
9's W"S,~y 创建分析面: )~xL_yW_X H|;6K`O_ JbpKstc; 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 6g4CUP'Y 4r#O._Z "Pi\I9M3 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 L>+g;GJ /tRzb8` FRED在探测器上穿过多个像素点迭代来创建热图 _?>!Bz
m K:yS24\% FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 l=D E|: 将如下的代码放置在树形文件夹 Embedded Scripts, c_clpMx= QwXM<qG* /*p4(D_A 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 Ntr5Q
IPd b9ysxuUdS 绿色字体为说明文字, W!q'wrIx( ^4(CO[|c~ '#Language "WWB-COM" pcXY6[#N 'script for calculating thermal image map 3S1V^C-eBx 'edited rnp 4 november 2005 {:m5<6?x) G~_5E]8 'declarations @_^QBw0 Dim op As T_OPERATION ~-x8@ / Dim trm As T_TRIMVOLUME UXD?gK1 Dim irrad(32,32) As Double 'make consistent with sampling Nge_ Ks Dim temp As Double Gir_.yc/ Dim emiss As Double >0)E\_ u Dim fname As String, fullfilepath As String +*,rOK`C !+& NG&1 'Option Explicit idnn%iO C0/s/p' Sub Main *cCr0\Z` 'USER INPUTS Jpg_$~k nx = 31 }`6-^lj ny = 31 i0/gyK numRays = 1000 hRb
k-b minWave = 7 'microns
T~8` {^ maxWave = 11 'microns ]W<E#^ sigma = 5.67e-14 'watts/mm^2/deg k^4 EA7]o.Nm*{ fname = "teapotimage.dat" ju0]~, /b6Y~YbgU Print "" L`FsK64@ Print "THERMAL IMAGE CALCULATION" Hf+A52lrf ehCc
N4V( detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 seY0"ym&e X
+;Q= Print "found detector array at node " & detnode hJ4==ILx 7c!oFwM srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 J9ovy>G qTC`[l Print "found differential detector area at node " & srcnode DamLkkoA
I'"*#QOX GetTrimVolume detnode, trm RL~|Kr<7J detx = trm.xSemiApe QI~s~j dety = trm.ySemiApe WzgzI/ area = 4 * detx * dety deaxb8'7 Print "detector array semiaperture dimensions are " & detx & " by " & dety B;4hI? Print "sampling is " & nx & " by " & ny Z]$yuM :eS7"EG{3 'reset differential detector area dimensions to be consistent with sampling %_M B- pixelx = 2 * detx / nx Fdd$Bl.&XS pixely = 2 * dety / ny ]w%7/N0R SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False NrVQK}%K Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 (~-q}_G;Q }@@1N3nnxV 'reset the source power X ~4^$x SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) RTA9CR)JP4 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" l1jS2O( x)G/YUv76 'zero out irradiance array yHQ.EZ~% For i = 0 To ny - 1 `@ qSDW!b For j = 0 To nx - 1 5<IUTso5h irrad(i,j) = 0.0 E1 *\)q Next j \yb^%$hZ0
Next i ]gTaTY @U;-5KYYi 'main loop F"hi2@/TI EnableTextPrinting( False )
_+|* &IT'%*Y:V ypos = dety + pixely / 2 {xEX_$nv For i = 0 To ny - 1 N<Bi.\XC xpos = -detx - pixelx / 2 .^@+$} ypos = ypos - pixely 4}580mBc 7`X"B*`~b EnableTextPrinting( True ) )t&|oQ3sVG Print i cWFvYF EnableTextPrinting( False ) $0LlaN@e A40 -])'! 'P@a_*I For j = 0 To nx - 1 t8GJ; _?kf9 . xpos = xpos + pixelx q,u>`]} HxZ4t 'shift source _I{&5V~z LockOperationUpdates srcnode, True xO1d^{~^^ GetOperation srcnode, 1, op e-qr d op.val1 = xpos nkJ*$cT1o op.val2 = ypos 'U1r}.+b> SetOperation srcnode, 1, op h^hEyrJw
LockOperationUpdates srcnode, False ]-x#zp;= 9-Ib+/R0 raytrace %Pa-fee DeleteRays Crpkq/ M CreateSource srcnode Om}&`AP}; TraceExisting 'draw "45BOw&72G qh.c#t 'radiometry {GWcw<g.B For k = 0 To GetEntityCount()-1 sE/9~L If IsSurface( k ) Then !+>yCy$~_ temp = AuxDataGetData( k, "temperature" ) B]*&lRR emiss = AuxDataGetData( k, "emissivity" ) OPKX&)SE- If ( temp <> 0 And emiss <> 0 ) Then pQVi&( M ProjSolidAngleByPi = GetSurfIncidentPower( k ) n1sH`C[c frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) X]1ep irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi RtqW!ZZ:H End If
zZiB`% {'!D2y.7g End If )@K|Co (Nik(Oyj" Next k ]KuK\(\ sn Ekei|0 Next j :A[bqRqe (n`\ b47 Next i RhQOl9 EnableTextPrinting( True ) jNIM1_JjD e#zGLxa 'write out file AOWI` fullfilepath = CurDir() & "\" & fname nIsi Open fullfilepath For Output As #1 CJu;X[6 Print #1, "GRID " & nx & " " & ny )bK<t Print #1, "1e+308" 3_ zI$Z Print #1, pixelx & " " & pixely LXXxwIBS Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 U-lN_? +=}%
7o maxRow = nx - 1 O'wN4qb=F maxCol = ny - 1 e<C5}#wt For rowNum = 0 To maxRow ' begin loop over rows (constant X) iww h,( row = "" +Nza@B d For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) rg'? ?rq row = row & irrad(colNum,rowNum) & " " ' append column data to row string r{<u\>6X>P Next colNum ' end loop over columns 5cfzpOqr0 r?[mn^Bo 5 Print #1, row Gg;#U` b _u&% Next rowNum ' end loop over rows R]V`t^1 Close #1 !^m5by "RShsJZMH Print "File written: " & fullfilepath M"_XaVl Print "All done!!" {UUVN/$ End Sub #Se lo(Ht=d 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:
#!hpe^t _c(=> l+N?:E$5=% 找到Tools工具,点击Open plot files in 3D chart并找到该文件 jOuv\$ cX=` Tl 3]
@<. 打开后,选择二维平面图: 4p-$5Fk8} I|LS_m
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