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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。 !'f3>W\
/U$8TT8+- 成像示意图 =1oNZKBP 首先我们建立十字元件命名为Target f7hXQ|$ u=&Bmn_ 创建方法: O%f8I'u$ &48_2Q"{ 面1 : d"U(`E=H9 面型:plane 6] z}#" 材料:Air UkfB^hA 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 3I|3wQ ( XTeb9h)3 Vh<A2u3& 辅助数据: R
4wr 首先在第一行输入temperature :300K, *zWWmxcJa emissivity:0.1; ;$BdP7i: 3_`szl- }E}8_8T6 面2 : -Z^4L 面型:plane S)A'Y]2X 材料:Air M]HgIL@9# 孔径:X=1.5, Y=6,Z=0.075,形状选择Box *]x*B@RF >?YNW 3,);0@I 位置坐标:绕Z轴旋转90度, Ze!92g BwJuYH7QJ$ y_}SK6{
辅助数据: A%vsno! 'FzN[% K" 首先在第一行输入temperature :300K,emissivity: 0.1; R:aYL~ #vf_D?^ i_F$&?) Target 元件距离坐标原点-161mm; l9/:FiJ_ *C,N'M<u z]Acs 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 DI&MC9j( m]IysyFFK {6x PdUhw 探测器参数设定: ~H[%vdR RP(/x+V 在菜单栏中选择Create/Element Primitive /plane hN(L@0) aEx(rLd+ 3SARr>HRyI ?Ay3u^X }`9`JmNM sIm#_+Y 元件半径为20mm*20,mm,距离坐标原点200mm。 vv
7+>% LW39YMw< 光源创建: &-GuKH(Y< FBsn;,3<W 光源类型选择为任意平面,光源半角设定为15度。 !%mi&ak(Rn rF'R>/H G^Xd- 7 GQ 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 @+^c"=d1S 5a(<%Q
<" 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 #@Ujx_F eO{@@?/y KtTza5aF 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 64D%_8#m F@hYA 创建分析面: IMad$AKc fQQ|gwVki ):bu;3E 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。 WF/l7u#4i '; /84j-3F lIuXo3 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/!Z KtMbze FRED在探测器上穿过多个像素点迭代来创建热图 r] t )x* U1Yo7nVf 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。 3cu9[~K 将如下的代码放置在树形文件夹 Embedded Scripts, )!C7bTv 4 93I'cWN G\1J _al 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。 9Q@*0- nC~fvyd<P 绿色字体为说明文字, 8^w/HCC8O `{G?>z Fp '#Language "WWB-COM" S+FQa7k 'script for calculating thermal image map )C}KR`" 'edited rnp 4 november 2005 T_~KxQ k_Tswf3 'declarations b5Q8pWZg, Dim op As T_OPERATION UE)fUTS Dim trm As T_TRIMVOLUME J v<$*TVS0 Dim irrad(32,32) As Double 'make consistent with sampling d~<QAh#rG Dim temp As Double IIaxgfhZ Dim emiss As Double M@O2
WB1ws Dim fname As String, fullfilepath As String 6F`\YSn+ kV1vb 'Option Explicit B+Q+0tw*i NQ!<f\m4n Sub Main ,xj3w#`zaf 'USER INPUTS OMd# ^z nx = 31 hrT%XJl ny = 31 M;qb7Mu numRays = 1000 \[T{M!s minWave = 7 'microns fN0bIE
Y maxWave = 11 'microns \ 522,n` sigma = 5.67e-14 'watts/mm^2/deg k^4 -,/3"}<^78 fname = "teapotimage.dat" qsvpW%?aE e;;):\p4 Print "" \c68n Print "THERMAL IMAGE CALCULATION" M*H<
n* _vIO!*h0 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 3"vRK5Bf kdBV1E+:C Print "found detector array at node " & detnode Wo2v5- }Eb]9c\ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 V{FE [v_ ixzTJ]y u Print "found differential detector area at node " & srcnode |>@-grs !Y|8z\Q GetTrimVolume detnode, trm d|3o/@k detx = trm.xSemiApe ;24'f-Eri dety = trm.ySemiApe $vqU|]J` area = 4 * detx * dety >3+FZ@.iT Print "detector array semiaperture dimensions are " & detx & " by " & dety QxA0I+i Print "sampling is " & nx & " by " & ny '&)D>@g H1C%o0CPY 'reset differential detector area dimensions to be consistent with sampling PnJ*Zea pixelx = 2 * detx / nx HNFhH0+^ pixely = 2 * dety / ny _^b@>C>O SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False +:!ScG* Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 s~)L_ p -HN%B?}. x 'reset the source power %GS\1 Q% SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ~z>BfL Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" v}f&q! [5!'ykZ 'zero out irradiance array v#-E~;CcC For i = 0 To ny - 1 $mD>rx For j = 0 To nx - 1 2pjW,I!` irrad(i,j) = 0.0 m'SmN{(t Next j QS5H>5M) Next i \.kTe<.:_ )X~#n 'main loop -$OD }5ku# EnableTextPrinting( False ) ^A- sS~w ^IYJEqK ypos = dety + pixely / 2 s><IykIi For i = 0 To ny - 1 hc6.#~i xpos = -detx - pixelx / 2 5pB^Y MP ypos = ypos - pixely N:OD0m%`) Et)920 EnableTextPrinting( True ) T6,V Print i rv`2*B EnableTextPrinting( False ) -!i;7[N 6EZ1YG} z;ULQ For j = 0 To nx - 1 -`Da`ml xkF$D:sP xpos = xpos + pixelx HRj7n<>L= yB=C5-\F 'shift source jT{f<P0 LockOperationUpdates srcnode, True c1PViko,> GetOperation srcnode, 1, op 0Y[*lM- op.val1 = xpos Y:rJK|m op.val2 = ypos hTDV!B-_( SetOperation srcnode, 1, op bd} r#^'K LockOperationUpdates srcnode, False BSOjyy1f @l)\?IEF@f raytrace Td5bDO DeleteRays +O&RBEa[ CreateSource srcnode @X
K> TraceExisting 'draw FPvuzBJ tF<^9stM 'radiometry %A8Pkr<&E For k = 0 To GetEntityCount()-1 W)|c[Q\ If IsSurface( k ) Then /SbSID_a temp = AuxDataGetData( k, "temperature" ) S^|$23} emiss = AuxDataGetData( k, "emissivity" ) nt drXg If ( temp <> 0 And emiss <> 0 ) Then /3OC7!~;fM ProjSolidAngleByPi = GetSurfIncidentPower( k ) yI3Q |731) frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) GSC{F#:z irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi WC3W+v G7 End If -)4uYK* U)u\1AV5 End If -,FK{[h]ka 79TPg Next k }Q!h ov >g>f;\mD7$ Next j mYiSR g8LT7 Next i &/sGh0 EnableTextPrinting( True ) i/5y^
rny@n^F 'write out file (m<R0 fullfilepath = CurDir() & "\" & fname XyvZ&d6(d Open fullfilepath For Output As #1 m5X3{[a: Print #1, "GRID " & nx & " " & ny NQDLI 1o Print #1, "1e+308" w9G_>+?E Print #1, pixelx & " " & pixely 5dg-d\6S Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 /!^L69um +R2^*
*< maxRow = nx - 1 h9w@oRp`~ maxCol = ny - 1 G/NTe For rowNum = 0 To maxRow ' begin loop over rows (constant X) 's$A+8;L row = "" jN31\)/i For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) c_@XQ&DC` row = row & irrad(colNum,rowNum) & " " ' append column data to row string ~!8%_J _ Next colNum ' end loop over columns Tg3:VD 8]sTX9 Print #1, row I++W0wa.n U(rr vNt:t Next rowNum ' end loop over rows 6.7`0v?,n Close #1 \Pw8wayr% tn"Y9
k| Print "File written: " & fullfilepath H @_eFlT t Print "All done!!" A Oby*c End Sub ybD{4&ZE IW5*9)N? 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: `V]egdO i!CKA}", >v^2^$^u 找到Tools工具,点击Open plot files in 3D chart并找到该文件 .'l.7t 9
eSN+q 4(` 2# 打开后,选择二维平面图: w^ixMn~nLF ]NaMZ
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