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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。 `- uZv nbkky.e 成像示意图 nH3b<k;S 首先我们建立十字元件命名为Target YQ[&h _R!!4Hp<Q 创建方法: N6 }i>";_; W~@GK 面1 : S r#fyr 面型:plane t BXsWY{ 材料:Air !?>p]0*< 孔径:X=1.5, Y=6,Z=0.075,形状选择Box M6 >\R$ 7_d#XKz@ Pt)}HF|u 辅助数据: 1_E3DXe 首先在第一行输入temperature :300K, b<8J ;u< emissivity:0.1; HI`A;G] 9QM"JEu@ 0R!}}*Ee>q 面2 : $R#L@iL- 面型:plane :@4>}k* 材料:Air x`|tT%q@l 孔径:X=1.5, Y=6,Z=0.075,形状选择Box <?va)
ou p-03V"^& (j 8,n<o 位置坐标:绕Z轴旋转90度, @^4M~F% o4
OEA)k)= LyPBFo[? 辅助数据: #d i_V" u2x=YUWb] 首先在第一行输入temperature :300K,emissivity: 0.1; Oj|p`Dzh L"^366M! W2LblZE! Target 元件距离坐标原点-161mm; EQ`t:jc{ (w:ACJ[[ *gpD4c7A\ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 >mDubP *L8HC8IbH u#k6v\/ 探测器参数设定: GpQF* x 9TN5|x 在菜单栏中选择Create/Element Primitive /plane CH+& O)Dw<j) >\x
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\B ^sJ[n pC.T)k 元件半径为20mm*20,mm,距离坐标原点200mm。 pPoC61F e;u8G/ 光源创建: RvZ-w$E&? Ck a]F2, 光源类型选择为任意平面,光源半角设定为15度。 cQ ;Ry!$ xi^e =:;` 4'[ V'c\ 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。 BiCa " #]/T9: 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。 05LQh v23Uh2[@Yy R2ZQBwB 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。 2 3w{h d nL20}"$E 创建分析面: __%E!*m"<_ ga9:*G!b{) 0lh6b3tdP 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。
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; 8mddI cyeDZ) 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 zFQkUgb ;@s~t:u FRED在探测器上穿过多个像素点迭代来创建热图 !T(Omve) <5vB{)Tq FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 -{SiK 将如下的代码放置在树形文件夹 Embedded Scripts, M:f=JuAx 80>!qG *%BI*p 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 R*C+Yk)Tkt "
CoR?[,x 绿色字体为说明文字, 5FKd{V' g}KZL-p4\m '#Language "WWB-COM" ; O0rt1 'script for calculating thermal image map ,X6j$YLWp 'edited rnp 4 november 2005 dph6aN(49 _\;#a 'declarations SnU{ZGR>sP Dim op As T_OPERATION DQnWLC"u Dim trm As T_TRIMVOLUME ;>Qd )' Dim irrad(32,32) As Double 'make consistent with sampling UH|.@7w Dim temp As Double (.+n1)L? Dim emiss As Double E1g$WhXIS Dim fname As String, fullfilepath As String Y\\nJuJo |:[vpJFK 'Option Explicit uelTsn =upP3rw Sub Main dq(L1y870 'USER INPUTS kn|l 3+ nx = 31 A@'W $p?5r ny = 31 !S{<Xc'wv numRays = 1000 2oASz| minWave = 7 'microns 1zW6Pb maxWave = 11 'microns S,%HW87 sigma = 5.67e-14 'watts/mm^2/deg k^4 )zV5KC{{ fname = "teapotimage.dat" k<qH<<r* ^u,x~nPXg Print "" Or>[_3 Print "THERMAL IMAGE CALCULATION" !YHu Ij_`=w< detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 e84TLU?~ e[!>ezaIY Print "found detector array at node " & detnode MEUqQ4/Gl :nEV/"#F srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 Gzt5efygKt L9)&9
/f Print "found differential detector area at node " & srcnode %L.+r!. bnQO}G GetTrimVolume detnode, trm ,cEcMaJ detx = trm.xSemiApe )v0vdAh'b dety = trm.ySemiApe gs>cx]> area = 4 * detx * dety ic#drpl, Print "detector array semiaperture dimensions are " & detx & " by " & dety (J*0/7
eX Print "sampling is " & nx & " by " & ny 6'zy"UkH V.1sZYA9 'reset differential detector area dimensions to be consistent with sampling 8{u01\0} pixelx = 2 * detx / nx ?2;G_P+ pixely = 2 * dety / ny )' #(1
,1k SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False gId+hxFa:r Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 V
"" _I!&w!3oM 'reset the source power Ls{fCi/2F SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 6 -}gqkR Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" [4e5(!e &EOh}O< 'zero out irradiance array gKCIfxM For i = 0 To ny - 1 qQ_QF For j = 0 To nx - 1 qT4s*kqr irrad(i,j) = 0.0 Y)`+u#`
R Next j ?Dm&A$r Next i yNL71 >w4 <9~qAq7^ 'main loop b'YbHUyu EnableTextPrinting( False ) L?fv5 S3 s-B\8&^C ypos = dety + pixely / 2 Xk$lQMwZ For i = 0 To ny - 1 9@06]EI_ xpos = -detx - pixelx / 2 9':$!Eoq ypos = ypos - pixely A-FwNo2"% UsTPNQj EnableTextPrinting( True ) [6|vx},N Print i "6i9 f$N EnableTextPrinting( False ) $BY{:#a] O]>`B{ j*{bM{~T< For j = 0 To nx - 1 p* @L1 $u :=lA:N xpos = xpos + pixelx =j0V/= Ou^dI 'shift source p98lu'?@ LockOperationUpdates srcnode, True &%lhov GetOperation srcnode, 1, op v6:DA#0 op.val1 = xpos )zN
)7 op.val2 = ypos y^Lw7 SetOperation srcnode, 1, op &ly[mBP~ LockOperationUpdates srcnode, False 8~i@7~
J 1;W>ceN" raytrace uOQ5.S+ DeleteRays 5
Jhl4p}w CreateSource srcnode |1D`v9 TraceExisting 'draw vF,l?cU~ `4CRpz 'radiometry ;IT^SHym For k = 0 To GetEntityCount()-1 RjDFc:bB If IsSurface( k ) Then yrjm0BM# temp = AuxDataGetData( k, "temperature" ) j*5VJ: emiss = AuxDataGetData( k, "emissivity" ) KJd;c. If ( temp <> 0 And emiss <> 0 ) Then bA)Xjq)Rr ProjSolidAngleByPi = GetSurfIncidentPower( k ) I9E@2[=! frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) VxCH}&! irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi VV End If eZcm3=WV| ZZTV
>: End If 2B4c:jJ `Ao:} Next k L6a8%%` ;Y"J j Next j J.<m@\U Z9U*SS5s, Next i =N=,;<6%A EnableTextPrinting( True ) `G'V9Xs( Bg`b*(Q 'write out file ,w6?}
N fullfilepath = CurDir() & "\" & fname -4Xr5j%o Open fullfilepath For Output As #1 9hv\%_>o Print #1, "GRID " & nx & " " & ny 2C-u2;X2 Print #1, "1e+308" ?sO_c3^7z Print #1, pixelx & " " & pixely AKpux,@xB Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 qb_V
,b9 r#XDgZtI maxRow = nx - 1 U|zW_dj maxCol = ny - 1 9qpH 8j+ For rowNum = 0 To maxRow ' begin loop over rows (constant X) @:[/uqL row = "" "CaVT7L For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) |0&S>%= row = row & irrad(colNum,rowNum) & " " ' append column data to row string 4Mprc~ 7vr Next colNum ' end loop over columns F JzjS; 4MM#\ Print #1, row j<!$ug9VA Pwq}
;+ Next rowNum ' end loop over rows MwuH.# Ez Close #1 ESs)|t h &(0iSS Print "File written: " & fullfilepath TC2aD&cw{ Print "All done!!" ecHy. 7H End Sub .Ybm27Dk ZGf=/Ra
a 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: xH=&={ {[$p}#7Y G67BQG\av 找到Tools工具,点击Open plot files in 3D chart并找到该文件 BAxZR PH]q#/' .VUZ4e
打开后,选择二维平面图: qb! vI3 GL /\uq
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