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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。 Wz9 }glr %rYd=Ri 成像示意图 c$>Tfa'H 首先我们建立十字元件命名为Target ]mYY1%H8M <zrGPwk 创建方法: wVp G!wFG-Y} 面1 : 6VIi
nuOW 面型:plane V,lz}&3L 材料:Air @'dtlY5; 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 6tj+ yw2sK7 *_@8 v? 辅助数据: W*N^G p@ 首先在第一行输入temperature :300K,
z7> emissivity:0.1; .]P@{T||Y o AvX( =lA*?'kd 面2 : @=:( b"Sg 面型:plane wU+-;C5e 材料:Air KxqJlben 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Q/L:0ovR NZCPmst j#zUO&Q@ 位置坐标:绕Z轴旋转90度, 3lQGU bZz ,' UhXZ^k3 辅助数据: EN'}+E
8 {p-&8- 首先在第一行输入temperature :300K,emissivity: 0.1; LL4yafh 1r'skmxq xmsw'\ Target 元件距离坐标原点-161mm; 9+_SG/@ ;(5b5PA ~{/"fTif 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 :[A>O( B^Fe.t y 73
ix4C 探测器参数设定: ?%d]iTZE |Q[[WHqj2f 在菜单栏中选择Create/Element Primitive /plane f+d[Q1 ha&2V= rzsAnLxo G&y< lh Z]jm.'@z@ 2guWWFS 元件半径为20mm*20,mm,距离坐标原点200mm。 _vr>-:G C5"=%v[gQv 光源创建: $t}t'uJ %a$ l%8j& 光源类型选择为任意平面,光源半角设定为15度。 )!+~q!A ?H3Ls~R ^M_0M 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。 1CXO=Q bVO{,P2o 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。 }V:ZGP#!' P+K< /i V $Y=JK@ 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 .ww~'5b0 #2{H!jr 创建分析面:
<m7m tX)l_?jVH Okxuhzn>" 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 X"lPXoCN J'4Pp< a/p}
?!\ 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 8725ET
t - >_rSjnM{ FRED在探测器上穿过多个像素点迭代来创建热图 kMd1)6%6A p^J=*jm)x FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 fXD9w1 将如下的代码放置在树形文件夹 Embedded Scripts, K;)(fc ;@/^hk{A #O<, 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 U4s)3jDw |0^~S 绿色字体为说明文字, lFJDdf2:$C xs?Ska,N '#Language "WWB-COM" MEKsL7 'script for calculating thermal image map ?5VPV9EX 'edited rnp 4 november 2005 L"[2[p JO[7_*s 'declarations |tn.ZEgw3~ Dim op As T_OPERATION WtS5i7:<Y Dim trm As T_TRIMVOLUME 1/\JJ\ Dim irrad(32,32) As Double 'make consistent with sampling }aSTo"~m# Dim temp As Double m-u3 ^\' Dim emiss As Double s]X0}"cz Dim fname As String, fullfilepath As String <b>g^ `}?D tleWJR8oc 'Option Explicit ^GL>xlZ( Rq@M~;p Sub Main ~S\y)l\wZ 'USER INPUTS ?q{HS&k nx = 31 +%sMd]$,n ny = 31 #EG$HX] numRays = 1000 -F7P$/9 minWave = 7 'microns lD9QS ; maxWave = 11 'microns to,\sc sigma = 5.67e-14 'watts/mm^2/deg k^4 O
n/q&h5 fname = "teapotimage.dat" 'Bx"i ^7l+ Ofb3 Print "" ~CX1WPMI: Print "THERMAL IMAGE CALCULATION" ?Z(xu~^/ 0+{CN|0 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 }j`#s P!xN]or]u Print "found detector array at node " & detnode W @
?* ~ nVyV]'-z srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 XP%/*am &*j# [6 Print "found differential detector area at node " & srcnode C.`!?CW
ihp>cl? GetTrimVolume detnode, trm EBMZ7b-7 detx = trm.xSemiApe }Gf9.ACQ dety = trm.ySemiApe D;! aix3 area = 4 * detx * dety qxbGUyH== Print "detector array semiaperture dimensions are " & detx & " by " & dety +wIv|zj9 Print "sampling is " & nx & " by " & ny 1c4@qQyo sI<PYi={-6 'reset differential detector area dimensions to be consistent with sampling b=PB" - pixelx = 2 * detx / nx 01w}8a( pixely = 2 * dety / ny =wquFA!c SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 9f #6Q*/ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 hMnJH_siY $+WMKv@< 'reset the source power Qv
B%X)J SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Ihy76_OZ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ,V &RpKek #-7w| 'zero out irradiance array 2fFGS.l For i = 0 To ny - 1 8i~n;AhDs For j = 0 To nx - 1 Y]neTX [ef irrad(i,j) = 0.0 7El :$H Next j q?$<{Z" Next i _>u0vGF- \1nj=ca? 'main loop @+&QNI06S EnableTextPrinting( False ) ?4sF:Y+\ ^kh@AgG^ ypos = dety + pixely / 2 =bh.V@* For i = 0 To ny - 1 "JpnmE[` xpos = -detx - pixelx / 2 m\eYm;RVj ypos = ypos - pixely :O9i:Xq[QW lG R6S EnableTextPrinting( True ) h(gpqSN Print i $.KDnl^ EnableTextPrinting( False ) uePa4e! T{4Ru6[ v%8S:3 For j = 0 To nx - 1 Al^h^ 9tJ !b{7gUjyI xpos = xpos + pixelx ss'`[QhR2 C@OY)!x! 'shift source 0oPcZ""X] LockOperationUpdates srcnode, True `3'4_@7s9 GetOperation srcnode, 1, op \[Q* d op.val1 = xpos m!sMr^W op.val2 = ypos !9g>/9h SetOperation srcnode, 1, op uoMDf{d LockOperationUpdates srcnode, False ;S}_/' dS)c~:&+ raytrace 'eg;)e:`b+ DeleteRays dFzlcKFFD CreateSource srcnode 't#E-+o TraceExisting 'draw BkJNu_{m? @Rs3i;"W 'radiometry s^>1rV]=(` For k = 0 To GetEntityCount()-1 s\io9'Ec If IsSurface( k ) Then eGk`Z> temp = AuxDataGetData( k, "temperature" ) n+H);Dg<8 emiss = AuxDataGetData( k, "emissivity" ) -J(93@X9 If ( temp <> 0 And emiss <> 0 ) Then ,+o*>fD ProjSolidAngleByPi = GetSurfIncidentPower( k ) ZE4xF8 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 7yFV.#K3O irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi uS&NRf9A End If *c'hmAs We:b1sZR End If 3ox
0-+_ gF8n{b Next k M'}iIO`L CSNfLGA Next j D.Z4noMA6 {3){f;b Next i E;Q
,{{# EnableTextPrinting( True ) HN~ L0EF
CQ7 'write out file |^T?5=&Kt fullfilepath = CurDir() & "\" & fname f) @-X! Open fullfilepath For Output As #1 `uLH3sr Print #1, "GRID " & nx & " " & ny B<6Ye9zuG Print #1, "1e+308" ~ -zch=+u Print #1, pixelx & " " & pixely a_amO<!
Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 m+'vrxTY $i.)1.x maxRow = nx - 1 L_QJS2 maxCol = ny - 1 1jkMje For rowNum = 0 To maxRow ' begin loop over rows (constant X) WJF#+)P:Y row = "" D/Hob For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ;nZN}&m
row = row & irrad(colNum,rowNum) & " " ' append column data to row string WbH#@]+DN Next colNum ' end loop over columns mrId`<L5l{ OM 4,Sevk Print #1, row ?h7(,39^> 7FvtWE* Next rowNum ' end loop over rows FCPiU3 Close #1 x/^,{RrPk ?JI:>3e Print "File written: " & fullfilepath gbL!8Z1h Print "All done!!" J={R@}u End Sub 18];fC $9Asr07 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: iR6w) $pGdGV\H N_eZz#); 找到Tools工具,点击Open plot files in 3D chart并找到该文件 KL4vr|i, k.("<) C,#FH} 打开后,选择二维平面图: ^L +@oS c ]!Yb-
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