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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。 {k_ PMl0G XlPK3^'N)h 成像示意图 R<n8M"B 首先我们建立十字元件命名为Target u8-a-k5< 1P[I}GW# 创建方法: a1
46kq lL:KaQ 0E 面1 : }g>dn 面型:plane Q^a&qYK 材料:Air 5T$}Oy1 孔径:X=1.5, Y=6,Z=0.075,形状选择Box -TzI>Fz RNv{n
mf mP9cBLz 辅助数据: 22)0zY%\ 首先在第一行输入temperature :300K, Jh37pI emissivity:0.1; b$dJ?%W b4Ricm Ci]'G>F@" 面2 : uSABh^ 面型:plane B;xZ%M] 材料:Air 0V<Aub[${ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box $Cz1C c=b+g+*xd rnnX|}J 位置坐标:绕Z轴旋转90度, 2wB.S_4"-< opm?':Qst zW%>"y 辅助数据: ?!bd!:(N +dqk6RE 首先在第一行输入temperature :300K,emissivity: 0.1; Dh
hG$ SQh+5 hMNJ'i} Target 元件距离坐标原点-161mm; bH'S.RWp= ,9=gVW{ 6N9 c<JC 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 7V~
"x&Eu AI&qU/} pTcbq 探测器参数设定: Z7JKaP9{: f'1(y\_fb 在菜单栏中选择Create/Element Primitive /plane ~c9>Nr9|` L/H v4={ rpUy$qrRc YSqv86 q}#iV$dAj LMAmpVo 元件半径为20mm*20,mm,距离坐标原点200mm。 PXV)NC 25aNC;J 光源创建: :~vxZ*a ?Fce!J 光源类型选择为任意平面,光源半角设定为15度。 GHv{ n%F-cw ID)^vwn 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。 'z)hG#{I 9Hu
d|n 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。 XAkK:}h y|^EGnaE gXLCRn!iR 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。 3FFaEl /$;,F't#2M 创建分析面: "\7 v
o*X]b] Yg/}ghF\ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 >L8?=>>?\ x5oOF7#5 W$r^ 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。 #>=8w9] 4AQ[igTDP FRED在探测器上穿过多个像素点迭代来创建热图 7skljw( C)OG62 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。 }<=3W5+ 将如下的代码放置在树形文件夹 Embedded Scripts, @@Q6TB wtSvJI~o) %4,xx'` 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。 U2bzUxK f27)v(EJ 绿色字体为说明文字, \^9pW 2v dXl]Pe|v '#Language "WWB-COM" BBxc*alG0 'script for calculating thermal image map )Ob]T{GY 'edited rnp 4 november 2005 bw9
nB{C< GzdRG^vN 'declarations wFvT0 Dim op As T_OPERATION fp{G|.SA Dim trm As T_TRIMVOLUME *<IR9.~{6% Dim irrad(32,32) As Double 'make consistent with sampling 4@6< Dim temp As Double ><=rIhG%H@ Dim emiss As Double h$pk<< Dim fname As String, fullfilepath As String TiyUr [ G=|70pxU 'Option Explicit eRs&iK2y hk_g2g Sub Main Um z05* 'USER INPUTS p>q&&;fe nx = 31 v5T`K=qC ny = 31 C',6%6P numRays = 1000 3rNc1\a; minWave = 7 'microns hU"F;4p maxWave = 11 'microns (9]6bd sigma = 5.67e-14 'watts/mm^2/deg k^4 *g_w I%l fname = "teapotimage.dat" hsz^rZ <B) Print "" 89Z#|#uM5 Print "THERMAL IMAGE CALCULATION" |gv{z" DtI$9`~ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 u]E.iXp pDn&V( Print "found detector array at node " & detnode rP'AJDuq V&*D~Jq srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 zsVcXBz |9IC/C!HC Print "found differential detector area at node " & srcnode ]JdJe6`Mc 'Jydu GetTrimVolume detnode, trm vk'rA{x detx = trm.xSemiApe L^FcS\r; dety = trm.ySemiApe ?Vc0) area = 4 * detx * dety 9i=B Print "detector array semiaperture dimensions are " & detx & " by " & dety (.?ZKL Print "sampling is " & nx & " by " & ny \|%E%Yc {<K=*rrZ 'reset differential detector area dimensions to be consistent with sampling :,
_!pe;H pixelx = 2 * detx / nx -bS)=L pixely = 2 * dety / ny Fp%Ln(/m SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False aQUGNa0+d Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 6G of.:"f %dW%o{ 'reset the source power kRlA4h1u_$ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ',)7GY/n~ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" -V5w]F' .z-UOyer 'zero out irradiance array H0>yi[2f For i = 0 To ny - 1 bL`eiol6 For j = 0 To nx - 1 $a(`ve| irrad(i,j) = 0.0 8lP6-VA Next j Td h TQ Next i IQnIaZ `}fw1X5L 'main loop sgAzL EnableTextPrinting( False ) ;>>C)c4V " e2w&&B- ypos = dety + pixely / 2 D4Etl5k For i = 0 To ny - 1 g"K>5Cb xpos = -detx - pixelx / 2 KX4],B5 + ypos = ypos - pixely ss
iok LE (D7$$!} EnableTextPrinting( True ) 9Ah[rK*} Print i !{Z~<Ky EnableTextPrinting( False ) <f>akT,W tR)H~l7q FTf<c0 For j = 0 To nx - 1 ,
ZFE( 7L3ik;> xpos = xpos + pixelx [4Q"#[V&9 O !&,5 Dy 'shift source )T|L,Lp LockOperationUpdates srcnode, True rv7{Ow_Y GetOperation srcnode, 1, op uQ/h'v op.val1 = xpos 7%;_kFRV op.val2 = ypos ?LP9iY${ SetOperation srcnode, 1, op 1m@^E:w LockOperationUpdates srcnode, False w>e
s MX|H}+\ 'raytrace DjLL|jF DeleteRays rwf^,r"r CreateSource srcnode xDLG=A%]z TraceExisting 'draw 0
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'radiometry |E)aT#$f' For k = 0 To GetEntityCount()-1 {38bv.3' If IsSurface( k ) Then sa&) #Z: temp = AuxDataGetData( k, "temperature" ) .iwZ*b{ emiss = AuxDataGetData( k, "emissivity" ) j/!H$0PN If ( temp <> 0 And emiss <> 0 ) Then /)L
0`:I# ProjSolidAngleByPi = GetSurfIncidentPower( k ) DAO]uh{6 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 'T8W!&$ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi s:>\/[*>0c End If >BVoHt~; k cuzB+ End If =O$M_1lp q_[G1&MC Next k \jU |(DE kHK0(bYK Next j G}nO@ cr;`Tl~}s Next i qxOi>v0\H EnableTextPrinting( True ) }6u2*(TmD b Bc- ^ 'write out file $ &UZy|9 fullfilepath = CurDir() & "\" & fname &qM[g9 Open fullfilepath For Output As #1 , X{> Print #1, "GRID " & nx & " " & ny }^kL|qmjR Print #1, "1e+308" Cb;WZ3HR Print #1, pixelx & " " & pixely 9pKGr@ & Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 #]Y>KX2HG F>hZ{ maxRow = nx - 1 `Ityi} maxCol = ny - 1 e^1uVN For rowNum = 0 To maxRow ' begin loop over rows (constant X) <n"C, row = "" ` uCI Xb For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 4,p;Km& row = row & irrad(colNum,rowNum) & " " ' append column data to row string Fr2N[\>s Next colNum ' end loop over columns Cfu=u *u V^s0fWa Print #1, row <@v]H@E /iaf ^
> Next rowNum ' end loop over rows <If35Z)~ Close #1 @~td`Z?1y ),}AI/j;zY Print "File written: " & fullfilepath ?#A]{l Print "All done!!" eGL1 End Sub EbNd=Z'J !^c@shLN4 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: l! bv^ ]b?9zeT*'l k(VB+k"3 找到Tools工具,点击Open plot files in 3D chart并找到该文件 s@4nWe e.d
#wyeX &EGqgNl 打开后,选择二维平面图: FDzqL;I k44Q):ncY7
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