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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。 <<~swN %RD%AliO}K 成像示意图 @?CEi#- 首先我们建立十字元件命名为Target Y'eE({)<K O&@pi-=o 创建方法: .0b4"0~T6 8;GuJP\ 面1 : RM6*c
. 面型:plane gv}J"anD 材料:Air v FWg0 $, 孔径:X=1.5, Y=6,Z=0.075,形状选择Box dO!5` ] P`TJqJiY~ K bM1b 辅助数据: "*JyNwf 首先在第一行输入temperature :300K,
y@2$sK3K emissivity:0.1; c#<p44>U JSu+/rI1 :V
ZXI#([ 面2 : 'Fr"96C$ 面型:plane zya2 O?s 材料:Air " gQJeMU 孔径:X=1.5, Y=6,Z=0.075,形状选择Box :>3/*"vx?G UtYwG#/w y$`@QRW 位置坐标:绕Z轴旋转90度, :`<ME/"YE `g^b Qx 0.z\YTZ9 辅助数据: ;nbbKQ]u 2P2/]-6s#r 首先在第一行输入temperature :300K,emissivity: 0.1; m
^'! 2 i97 %shCqS Target 元件距离坐标原点-161mm; qj1Fj $b`~K MO e=sV>z> 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 'j'G4P_G [iUy_ C=qp -W.bOr 探测器参数设定: qt`HP3J& xV>sc;PEb 在菜单栏中选择Create/Element Primitive /plane NT;cTa=; f?W" ^6Df Zr|z!S?aSC TxvvCV^
!eA6Ejf wuKr9W9Xa 元件半径为20mm*20,mm,距离坐标原点200mm。 M@<r8M]G .Zm de*b 光源创建: P0ZY;/e5h #8r1<`']! 光源类型选择为任意平面,光源半角设定为15度。 ]6@6g>f? Ws;X;7tS e`bP=7`0 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 N4$ K{ w-P;E!gTt 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。 CG]/. 3,)[Q?nKD :Ny^-4-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。 ?e2G{0V n*r Xj{Kt 创建分析面: C=x70Y/ cQrXrij;! NfND@m{/ 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。 }#phNn6 :4[_&]H |>Pz#DCy 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。 DqA$%b
yyE }gKY_e3 FRED在探测器上穿过多个像素点迭代来创建热图 bJ^Jmb %|B$y;q^3 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。 ;^cMP1SH 将如下的代码放置在树形文件夹 Embedded Scripts, -%TwtO<$'] X/FR e[R 4"#F=f0 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 \0.!al0 =Y*zF>#lP 绿色字体为说明文字, T[kS;-x 5?*Iaw '#Language "WWB-COM" t(1gJZs>kX 'script for calculating thermal image map q@i.4>x 'edited rnp 4 november 2005 jJAr #| C:z7R" yj 'declarations j-zWckT{ Dim op As T_OPERATION m@"p#pt(_ Dim trm As T_TRIMVOLUME y\R-=Am". Dim irrad(32,32) As Double 'make consistent with sampling ~h$
H@&5 Dim temp As Double zz #IY'dwT Dim emiss As Double !eP0b~$/^J Dim fname As String, fullfilepath As String l $0w 9Z^ rh T!8dTk 'Option Explicit ekd;sEO 5hfx2O) Sub Main .}Hs'co 'USER INPUTS ~*L@|? nx = 31 V o%GO9b; ny = 31 jF-0 fK;)* numRays = 1000 64D4*GQ minWave = 7 'microns wrVR[v>E< maxWave = 11 'microns =z'533C sigma = 5.67e-14 'watts/mm^2/deg k^4 GK&R.R] fname = "teapotimage.dat" !J(6E:,b# Lbu,VX Print "" j#${L6 Print "THERMAL IMAGE CALCULATION" t![972.& qot{#tk
d detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 xLw[
aYy4 ,.V=y% Print "found detector array at node " & detnode yppXecFJ *2Q x69` srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 i|fkwV,5 ;V^ I>-fnm Print "found differential detector area at node " & srcnode sNJ?Z"5k1h >Vb V<ak GetTrimVolume detnode, trm t}gK)"g detx = trm.xSemiApe ]%UAN_T dety = trm.ySemiApe jyC>~}? area = 4 * detx * dety |2&|#K4k^ Print "detector array semiaperture dimensions are " & detx & " by " & dety }tedh Print "sampling is " & nx & " by " & ny >2tosxH M kaV Ye)~ 'reset differential detector area dimensions to be consistent with sampling hYh~[Kr^@^ pixelx = 2 * detx / nx >|JMvbje pixely = 2 * dety / ny O9Yk5b; SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False VqeW;8&*iv Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 T7Yg^ -" 4'XCO+i# 'reset the source power c1StA SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) T4}q%%7l Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" UbSD?Ew@35 iD2>-yf 'zero out irradiance array Xj21:IMR For i = 0 To ny - 1 }fz;La:b For j = 0 To nx - 1 m ,TYF irrad(i,j) = 0.0 G)\6W#de4 Next j &qZ:"k Next i fhe%5#3 9_pOV%Qs 'main loop |C;*GeyS;J EnableTextPrinting( False ) +#ANc;2g LzkwgcR ypos = dety + pixely / 2 )"<:Md$7 For i = 0 To ny - 1 y?{YQ)fj xpos = -detx - pixelx / 2 0G/_"}@ ypos = ypos - pixely -44''w?z PiwI.c EnableTextPrinting( True ) woR }=\K Print i .R{P%r EnableTextPrinting( False ) j0[9Cj^%c =k22f`8ew OPVcT For j = 0 To nx - 1 D$y-Kh f}F
xpos = xpos + pixelx <3c|S_|L*m .(2ui~ed 'shift source ?BnjtefIe LockOperationUpdates srcnode, True }z8HS<
#Q GetOperation srcnode, 1, op ;]Bkw6o op.val1 = xpos | WMq&-$D op.val2 = ypos B>W!RyH8o SetOperation srcnode, 1, op 5A=FEg LockOperationUpdates srcnode, False yjxv D p-o!K\o-1 'raytrace sj0{;>>%+N DeleteRays iZ-"l3)D CreateSource srcnode YE\s<$ TraceExisting 'draw ^J Y]w^u x4vowF 'radiometry Z6xM(*vg For k = 0 To GetEntityCount()-1 n:wZL&ZV0 If IsSurface( k ) Then J 4OgV? temp = AuxDataGetData( k, "temperature" ) VaRP+J}UA. emiss = AuxDataGetData( k, "emissivity" ) x#_0
6 If ( temp <> 0 And emiss <> 0 ) Then 9n#Em ProjSolidAngleByPi = GetSurfIncidentPower( k ) 9!sR} frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) m'i^BE irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 2E":6:Wsw End If
<c&6M 5<y pK`Kq End If w,QO!)j! NXw$PM|+R Next k l@zr1g) 9G@
J#vsqr Next j hqKftk)+ rpu{YC1C% Next i qJZ5w} EnableTextPrinting( True ) x)<Hr,wd 7FiQTS B: 'write out file a!US:^}lu fullfilepath = CurDir() & "\" & fname c$>$2[*= Open fullfilepath For Output As #1 "me
a*-XB Print #1, "GRID " & nx & " " & ny \%FEQa0u Print #1, "1e+308" 9
Z D4Gv Print #1, pixelx & " " & pixely _s_%}8o Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 @m=xCg.Z mw*BaDN@Q maxRow = nx - 1 D^5bzZk
N maxCol = ny - 1 %fyah}= For rowNum = 0 To maxRow ' begin loop over rows (constant X) *"pf3x6 row = "" XOe8(cXa9 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 8sG0HI$f+ row = row & irrad(colNum,rowNum) & " " ' append column data to row string W_E0+ Next colNum ' end loop over columns : 6*FnKD 6?3f+=e"~! Print #1, row kq
SpZoV0' / ao|v Next rowNum ' end loop over rows dt -=7mz# Close #1 ; SS/bS| Jmp%%^ Print "File written: " & fullfilepath _U"9#< Print "All done!!" J( End Sub /8(\AuDT GYX/G>-r 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: 'TF5CNX k-$5H~(PZ /7nircXj@ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 )NoNgU\7! W]]@pbG"H\ ^11y8[[ 打开后,选择二维平面图: 9Dq^x&z( VuOZZ7y
QQ:2987619807 3q!hY
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