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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。 0x4Xs z{]$WVs:^ 成像示意图 4;<?ec(dc 首先我们建立十字元件命名为Target lr=? &>MXj D\}^<HW 创建方法: Qo4]_,kR Q]S~H+eRy 面1 : blpX_N 面型:plane FDbb/6ku 材料:Air IX$dDwY|O> 孔径:X=1.5, Y=6,Z=0.075,形状选择Box T&oY:1D,g qg7.E+ }TzMWdT 辅助数据: 3=RV Jb 首先在第一行输入temperature :300K, =3]}87 emissivity:0.1; b^~ keQ P(l$5x]g, ^HgQ"dD
< 面2 : ` .|JTm[ 面型:plane mKugb_d? 材料:Air LBq~?Q.e 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ] JVs/ '-oS=OrZ 8UJK]_99I, 位置坐标:绕Z轴旋转90度, 12`q9Io" i,r O3Jn )h]~<
fU 辅助数据: 0"ksNnxK {Fs}8\ z 首先在第一行输入temperature :300K,emissivity: 0.1; VgD z:j )_k"_VVcC 29("gB Target 元件距离坐标原点-161mm; tJ>%Xop G0oY`WXOB *1"xvle 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ajC'C!"^Ty UCG8=+t5T N[~{'i 探测器参数设定: +;^UxW x)N$.7'9OJ 在菜单栏中选择Create/Element Primitive /plane H=Scrvfx :)o 4fOJ8 KJn@2x6LP Dk8
O*B cyrVz4_a hsG~xRA\ 元件半径为20mm*20,mm,距离坐标原点200mm。 5b> -t#N, a~q_2S]h 光源创建: *j5>2-C & GKT2x '(e 光源类型选择为任意平面,光源半角设定为15度。 cq lA"Eof M8dv
y!D .1n=&d| 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。 Zk,`
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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。 `EKmp|B_p_ )4:K@ \|e>(h!l; 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。 G"k.sRKu CD]hi,B_J 创建分析面: Dl=9<:6FW DrI"YX ffoL]u\ 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。 wcr3ugvT Z|3fhaT X$*MxMNs 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 kw)("SQ 0lpkG
="&r FRED在探测器上穿过多个像素点迭代来创建热图 w>#{Nl7gz ?,s]5 FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 pH&*5=t} 将如下的代码放置在树形文件夹 Embedded Scripts, w
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H{L y8*MNw J)7\k$ D 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。 D5Zgi! I=aoP}_ 绿色字体为说明文字, r<'ni -M]B;[^ '#Language "WWB-COM" f3yH4r?;w 'script for calculating thermal image map /my5s\;s|z 'edited rnp 4 november 2005 ?'_Ty`vT E_q/*}]pE 'declarations nm"]q`(K Dim op As T_OPERATION d]A.=NAc Dim trm As T_TRIMVOLUME rR Kbs@1M Dim irrad(32,32) As Double 'make consistent with sampling 7bV(eV Dim temp As Double pbCj
^ Dim emiss As Double CdBpz/ Dim fname As String, fullfilepath As String 26M:D&| ZB Wd`*<+t] 'Option Explicit yq H TWzlF>4N Sub Main yMG(FAyu 'USER INPUTS o*MiKgQ& nx = 31 @%lkRU) ny = 31 j_I[k8z numRays = 1000 ]& 8c
45c minWave = 7 'microns Pj-.oS2dA maxWave = 11 'microns mkE_ a> sigma = 5.67e-14 'watts/mm^2/deg k^4 1Kjqs)p^ fname = "teapotimage.dat" 45.<eWH$*( e{Q;,jsh Print "" 2LfiaHO Print "THERMAL IMAGE CALCULATION" DCsamOA~ Bd'X~Vj< detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 sLKk1A
HNJR&U t Print "found detector array at node " & detnode @4t_cxmD ,?>{M srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 sYEh>%mo^C i)iK0g"2 Print "found differential detector area at node " & srcnode HVJqDF pV8_i7\ GetTrimVolume detnode, trm ! k[JP+; detx = trm.xSemiApe d*YVk{s7V dety = trm.ySemiApe mEm=SpO[$o area = 4 * detx * dety (himx8Uml2 Print "detector array semiaperture dimensions are " & detx & " by " & dety ]'NL-8x"> Print "sampling is " & nx & " by " & ny `@q\R-` PglSQ2P 'reset differential detector area dimensions to be consistent with sampling # a`D6; pixelx = 2 * detx / nx xTU;rJV pixely = 2 * dety / ny /7 8zs- SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False }qw->+nD Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 >'lv Zt uTdx`>M,O 'reset the source power J$W4AT SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) "ejsz&n Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" SK5_^4 z`qb>Y"xf3 'zero out irradiance array >\!G43Q= For i = 0 To ny - 1 ZEp>~dn; For j = 0 To nx - 1 ;^TSla+t+ irrad(i,j) = 0.0 &^UT Next j PNz]L Next i ?8do4gT+1 ]xkh"j+W 'main loop F pT$D EnableTextPrinting( False ) 28LBvJVq@ ;reBJk ypos = dety + pixely / 2 HUAbq } For i = 0 To ny - 1 ken.#>w xpos = -detx - pixelx / 2 }[{9u#@# ypos = ypos - pixely #bJp)&LO zs(P2$ EnableTextPrinting( True ) 74
WKy Print i eslvg#Q EnableTextPrinting( False ) AdpJ4}|0 2,Aw6h; C2aA])7D For j = 0 To nx - 1 ? 'qyI^m@ W}y)vrL xpos = xpos + pixelx :?}mu1 TCFr-*x 'shift source a/v]E]=qI LockOperationUpdates srcnode, True +I\54PBws GetOperation srcnode, 1, op ]h#QA; op.val1 = xpos .l hS op.val2 = ypos id588Y78 SetOperation srcnode, 1, op G!`PP LockOperationUpdates srcnode, False V.9p4k` K_AdMXF9 raytrace $|g
; DeleteRays .EPv4[2%F8 CreateSource srcnode v8WT?% TraceExisting 'draw g${JdxR: ?yxQs=&-q~ 'radiometry hH9~.4+*`g For k = 0 To GetEntityCount()-1 ,J'_Vi If IsSurface( k ) Then obGhO temp = AuxDataGetData( k, "temperature" ) 1 +s;a]-C emiss = AuxDataGetData( k, "emissivity" ) Go!{@xx> If ( temp <> 0 And emiss <> 0 ) Then '7pzw>E=: ProjSolidAngleByPi = GetSurfIncidentPower( k ) c5| sda{ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) x#5vdBf irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi fJP *RVz End If HYmUD74FR [!>9K}z,= End If 5*f54g"' {n&n^`Em Next k A|,qjiEJCc W"*2,R[}% Next j $hHV Ie]+ CPL,QVO9 Next i b\KbF/T EnableTextPrinting( True ) mo3A *|U |d z2Drc 'write out file BG8/ fullfilepath = CurDir() & "\" & fname 98)C
7N' Open fullfilepath For Output As #1 ?:M4GY"gV Print #1, "GRID " & nx & " " & ny AAs&P+;
Print #1, "1e+308" yoJ.[M4q Print #1, pixelx & " " & pixely ZDAW>H< Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 Zxd*%v; j:qexhtho maxRow = nx - 1 Mo<q(_ZeRP maxCol = ny - 1 Be6+YM5Cl For rowNum = 0 To maxRow ' begin loop over rows (constant X) WF-jy7+ row = "" $=Ns7Sbup For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 3z, Ci$[ row = row & irrad(colNum,rowNum) & " " ' append column data to row string "OA{[)fw" Next colNum ' end loop over columns Qclq^|O0 {;E6jw@ Print #1, row Cl9rJ oT t1 U+7nM Next rowNum ' end loop over rows A)4XQF Close #1 ?pfr^
!@$ |IV7g*J89 Print "File written: " & fullfilepath ^iBIp# Print "All done!!" 122s7A End Sub 4Ngp - c|`$
h 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: Zhv%mUj~ kx d*B
P hd i0YL 找到Tools工具,点击Open plot files in 3D chart并找到该文件 i\l}M]Z# $Hj;i/zD A6 .wXv, 打开后,选择二维平面图: zeuj tK .1
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