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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。 b5jD /X4 be_h
uZ 成像示意图 3d1xL+ 首先我们建立十字元件命名为Target Zm++5b`W/[ %RF$Y=c'C 创建方法: ;QCGl$8A 47*2QL^zj 面1 : B>d49(jy 面型:plane 5S&Qj7kr 材料:Air ouo IbA9X 孔径:X=1.5, Y=6,Z=0.075,形状选择Box fwzyCbks [9~EH8 7TypzgXNe 辅助数据: 7J$rA.tu 首先在第一行输入temperature :300K, d_Zj W emissivity:0.1; '
Gx\ |t3}>+"?z %a0q|)Nrj 面2 : 6MU;9|& 面型:plane yU7XX+cB7 材料:Air eL)m( 孔径:X=1.5, Y=6,Z=0.075,形状选择Box [4IqHe Y4,p_6aKJ] F8tMZ,: 位置坐标:绕Z轴旋转90度, aWLA6A+C& 9<P%?Q /Hm/%os 辅助数据: P$AHw;n[R +@8, uL 首先在第一行输入temperature :300K,emissivity: 0.1; g3%x"SlIU t)k;5B`> & AOL=;z9c# Target 元件距离坐标原点-161mm; 7hMh%d0d(_ lY,9bSF$ ,1<6=vL 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 !rqs!-cCQ Dq!YB[Z$: z1tCSt}7f 探测器参数设定: U%VFr# ]eFNR1<OP 在菜单栏中选择Create/Element Primitive /plane b!"qbC1 KlBT9"6" qf[J-"o 4{6,Sx {Q]7!/>> {ynI]Wj`L 元件半径为20mm*20,mm,距离坐标原点200mm。 $mf6!p4 Dp^=% F{t 光源创建: Y1qbu~! #q&Nd2y 光源类型选择为任意平面,光源半角设定为15度。 es+ZPX>Y | -Gb Hfz o(3OChH 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 v Oo^H MfFmJ7>Bg 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 %,Y^Tp S|yDGT1 W7~OU(}[` 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 }ri7@HCY4 NcSi %] 创建分析面: 6Ol)SQE, %5Elj<eHZ n4+^f~Y 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 i5*/ZA_ LR"7e Gh%dVP9B@P 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 ('=Q[ua7-( kO/;lrwC FRED在探测器上穿过多个像素点迭代来创建热图 2Aa YQO9$g0%
~ 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。 *;T HD> 将如下的代码放置在树形文件夹 Embedded Scripts, =`V9{$i r6 pz(rCs} =}SC .E\ 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 LN'})CI8m T^X um2Ec 绿色字体为说明文字, JVPLE*T <2I<Z'B,e '#Language "WWB-COM" g9=O<u# 'script for calculating thermal image map 2>Kn'p 'edited rnp 4 november 2005
?U~`'^@ ]XfROhgP= 'declarations I[LHJ4 Dim op As T_OPERATION Thp!X/2O` Dim trm As T_TRIMVOLUME IU]@%jA_:A Dim irrad(32,32) As Double 'make consistent with sampling 9\6ZdnEKu, Dim temp As Double FJsg3D*@J Dim emiss As Double k]A$?C0Q<% Dim fname As String, fullfilepath As String !OR%AdxB [Ue"#w 'Option Explicit *{e,< DV `hU2Ss~ Sub Main +C=^,B!, 'USER INPUTS $n<X'7@0 nx = 31 `u;4Z2Lr0 ny = 31 zids2/_* numRays = 1000 FK,YVY minWave = 7 'microns r5!Sps3B maxWave = 11 'microns =G1
5eZW sigma = 5.67e-14 'watts/mm^2/deg k^4 0"c(n0L fname = "teapotimage.dat" mH4Jl1S& thQ)J |1 Print "" j"P}Wn Print "THERMAL IMAGE CALCULATION" p=f8A71 "nn>I}jK detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 fq[,9lK 9,AHC2kn% Print "found detector array at node " & detnode :k oXS SBG.t: srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 R94ID@LF $4rMYEn08 Print "found differential detector area at node " & srcnode rqi|8gKY 0BHSeO, GetTrimVolume detnode, trm E&2mFg detx = trm.xSemiApe koOp:7r dety = trm.ySemiApe (>gHfC>(lq area = 4 * detx * dety :=,lG ou Print "detector array semiaperture dimensions are " & detx & " by " & dety lRA! Print "sampling is " & nx & " by " & ny ':?MFkYC $3:O}X> 'reset differential detector area dimensions to be consistent with sampling /AUXO] pixelx = 2 * detx / nx mMtX: pixely = 2 * dety / ny lEiOE] SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False '0E^th#u-0 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 %0^taA >{w"aJ" F 'reset the source power vip&
b}u SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) sT% ^W Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" $@4(Lq1. Qf(mn8 'zero out irradiance array =jW=Z$3q For i = 0 To ny - 1 p |xMXoa` For j = 0 To nx - 1 OLgW.j:Ag irrad(i,j) = 0.0 4l"oq"uc Next j %DF-;M"8 Next i a2`|6M; d"hW45L 'main loop :=^_N} EnableTextPrinting( False ) 9..! g: #MI4 `FZ ypos = dety + pixely / 2 '6W|, For i = 0 To ny - 1 ^# gR"\F`d xpos = -detx - pixelx / 2 *^-~J/ ypos = ypos - pixely Q GQ}I *we*IhIP EnableTextPrinting( True ) DAt Zp% Print i C%\. EnableTextPrinting( False ) 9 54O=9PQ lQnqPQY r1QLSD]i6 For j = 0 To nx - 1
2<' 1m{ dAj;g9N/h xpos = xpos + pixelx 1 n<7YO7} @{y[2M} %] 'shift source q+/7v9 LockOperationUpdates srcnode, True 2YL)"
w GetOperation srcnode, 1, op %I6c}*W op.val1 = xpos 4!
V--F op.val2 = ypos 57 eA(uI SetOperation srcnode, 1, op ('7qJkV LockOperationUpdates srcnode, False GH!Lu\y\ MehMhHY raytrace [#Y7iN& DeleteRays ,8MUTXd@ V CreateSource srcnode yw9)^JU8" TraceExisting 'draw h1'j1uI }Kc03Ue`%e 'radiometry mUW4d3tE For k = 0 To GetEntityCount()-1 JVgV,4 1 If IsSurface( k ) Then @z!|HLD+ temp = AuxDataGetData( k, "temperature" ) kX)Xo`^Ys emiss = AuxDataGetData( k, "emissivity" ) C:WXI;*cr If ( temp <> 0 And emiss <> 0 ) Then b/eJEL ProjSolidAngleByPi = GetSurfIncidentPower( k ) M@b:~mI[sw frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) _9Zwg+oO[ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi K_X10/#b& End If a*gzVE7W#n ySk'#\d End If W<AxctId xJ18M@"j Next k AvS<b3EoN N4JJA+ Next j WG0Ne;Ho ?UGA-^E1 Next i B5iVT<:a EnableTextPrinting( True ) ;m[-yqX [9S? 'write out file A/zZ%h fullfilepath = CurDir() & "\" & fname / .ddx< Open fullfilepath For Output As #1 LyB &u() Print #1, "GRID " & nx & " " & ny 1D/9lR, Print #1, "1e+308" r(#]Z Print #1, pixelx & " " & pixely d?uN6JH9 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 sD[G?X YAvOV-L maxRow = nx - 1 U)n+j}vi maxCol = ny - 1 7;T6hKWV[ For rowNum = 0 To maxRow ' begin loop over rows (constant X) L(bYG0ZI5C row = "" G(~
s(r{%I For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) cU^Z=B row = row & irrad(colNum,rowNum) & " " ' append column data to row string I#m0n%-[ Next colNum ' end loop over columns nYc8+5CcK' zFn-VEJ) Print #1, row 6ofi8(n[ NQx`u"= Next rowNum ' end loop over rows O_u2V'jy9 Close #1 B7^*xskH GV1SKa Print "File written: " & fullfilepath I|27%i Print "All done!!" >8*J ;(:W End Sub +l "z (rM-~h6g 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: i^2yq&uT( l^B PTg)X@ y]5c!N %8 找到Tools工具,点击Open plot files in 3D chart并找到该文件 Kn!n}GtR X<OOgC $T)EJe 打开后,选择二维平面图: E9]/sFA-] |NsrO8H
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