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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。 SJ-Sac58r YB|9k)Z2[ 成像示意图 L9@jmh*E 首先我们建立十字元件命名为Target Ah`dt8t ccSS au5N 创建方法: O#\>j g]#Wve 面1 : Xn=fLb( 面型:plane Ln|${c 材料:Air z"#.o^5 孔径:X=1.5, Y=6,Z=0.075,形状选择Box \YS?}! 0 hz%IxI9 EoeEg,'~F 辅助数据: as4NvZ@+r 首先在第一行输入temperature :300K, *&]l emissivity:0.1; ?r<F\rBT7* xJhbGK /(aX>_7jg 面2 : }TW=eu~ 面型:plane MjTKM; 材料:Air B(LV22# 孔径:X=1.5, Y=6,Z=0.075,形状选择Box |Y11sDa9h rE:>G]j6 v"+EBfx 位置坐标:绕Z轴旋转90度, $@)d9u
cd >lmL \irjIXtV 辅助数据: ltR^IiA} h :R)KM 首先在第一行输入temperature :300K,emissivity: 0.1; 1\0@?6`^ E,@UM$alP (xed(uFEK Target 元件距离坐标原点-161mm; H)Ge#=;ckQ :\_MA^< IcQ!A=lB 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 [!mjUsut* GcW}<g} #7h fEAk 探测器参数设定: di2=P)3 eB*8)gYh 在菜单栏中选择Create/Element Primitive /plane [i7)E]*oTA 0)V-|v` Vz]=J;`Mz 0pa^O$?p VYo;[ue([ YWrY{6M 元件半径为20mm*20,mm,距离坐标原点200mm。 GTl (i*
-<]_:Kf{;& 光源创建: {C6;$#7P GuvF 光源类型选择为任意平面,光源半角设定为15度。 79g>7<vp T
l(uqY?9 uTGvXKL7 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。 3G|fo4g #/<Y!qV& 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。 `|Z@UPHzG JSK5x(GlH a&Du5(r;! 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。 bGc|SF<V $#3<rcOq 创建分析面: s,H(m8#> y/hvH"f h##?~!xDmq 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 h\\2r> JBAK*g 8k?L{hF|nW 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 w]o5L 6F/
OlK< FRED在探测器上穿过多个像素点迭代来创建热图 \ZWmef s
FYJQ90it FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 <SdJM1%Qo 将如下的代码放置在树形文件夹 Embedded Scripts, {0WIDD {<[tYZmj. <D;Q8 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 +gCy@_2; @aN=U= 绿色字体为说明文字, iiB )/~!O )h_7 2 '#Language "WWB-COM" N%|Vzc 'script for calculating thermal image map b(-t)5^} 'edited rnp 4 november 2005 udI:]:,P T-2p`b}hW 'declarations TxxB0 Dim op As T_OPERATION 0*/ r' Dim trm As T_TRIMVOLUME gdFoTcHgO| Dim irrad(32,32) As Double 'make consistent with sampling UJ)M:~O Dim temp As Double Yk@s"qm3 Dim emiss As Double !2U7gVt"* Dim fname As String, fullfilepath As String @3TkD_B& jI2gi1,a 'Option Explicit mYOdBd ~K$"PKs3 Sub Main P9mxY*K)%5 'USER INPUTS V -4*nV nx = 31 _.*4Y ny = 31 /Q>{YsRRB numRays = 1000 FoD/Q
minWave = 7 'microns ~eOj:H maxWave = 11 'microns E(3+o\w sigma = 5.67e-14 'watts/mm^2/deg k^4 imCl{vt(kj fname = "teapotimage.dat" fy=C!N&/ |U$de2LF Print "" mx(%tz^t Print "THERMAL IMAGE CALCULATION" =
EChH@3 ""v`0OP&J detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 VO;UV$$ K!D!b'|bb Print "found detector array at node " & detnode lPcVhj6No% f'`nx;@X srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 [gh[F NuS|X
Print "found differential detector area at node " & srcnode E,D:D3O nL(%&z \4 GetTrimVolume detnode, trm )\D40,p detx = trm.xSemiApe [T[9*6Kt dety = trm.ySemiApe w]Ko/;;^2 area = 4 * detx * dety Y^ZBA\D2,k Print "detector array semiaperture dimensions are " & detx & " by " & dety
2HK Print "sampling is " & nx & " by " & ny uJ/?+5TU +`s&i%{1> 'reset differential detector area dimensions to be consistent with sampling @+\S!o3m pixelx = 2 * detx / nx $,QpSK`9i pixely = 2 * dety / ny "X{aS} SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False NzeI/f3K5 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ,F`KQ
)\" mQ^@ \s 'reset the source power ?y*+^E0 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 'K@{vB Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ,7fc41O3V e9Ul A 'zero out irradiance array q~Q)'*m For i = 0 To ny - 1 VM]GYz|#] For j = 0 To nx - 1 `l gjw= irrad(i,j) = 0.0 Q+!0)pG5# Next j 4/`h@]8P Next i Ub'%pU -Nlf~X 'main loop >\?z37:T EnableTextPrinting( False ) H?`)[# J%\~<_2ny ypos = dety + pixely / 2 |:(23O For i = 0 To ny - 1 NHFEr xpos = -detx - pixelx / 2 CEX}`I*- ypos = ypos - pixely t;LX48TQ 7Js>!KR EnableTextPrinting( True ) 7dlKdKH Print i b,rH&+2H EnableTextPrinting( False ) sR>`QIi(a E/dO7I`B {KU. For j = 0 To nx - 1 ?9(o*lp da00p-U xpos = xpos + pixelx 1(%>`=R8 [j=,g-EOA 'shift source !O F?xW LockOperationUpdates srcnode, True U50s!Zt45 GetOperation srcnode, 1, op `s>UU- 9 op.val1 = xpos ib(>vp$V op.val2 = ypos &PRx,G5 SetOperation srcnode, 1, op mZbWRqP[|_ LockOperationUpdates srcnode, False `\/toddUh[ P>{US1t raytrace J+}+"h~. DeleteRays FI1THzW4J CreateSource srcnode e' U"`)S TraceExisting 'draw tIGVB+g{F R,x> $n 'radiometry yV J dZ I For k = 0 To GetEntityCount()-1 aJ5H3X}Y If IsSurface( k ) Then 2/yXY_L temp = AuxDataGetData( k, "temperature" ) d1~_?V'r] emiss = AuxDataGetData( k, "emissivity" ) VDByj "% If ( temp <> 0 And emiss <> 0 ) Then d)04;[= ProjSolidAngleByPi = GetSurfIncidentPower( k ) 1jH7<%y frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) T|o`a+? irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi I!$jYY2 End If 861i3OXVE> $5TepH0D End If )YzH k ;( )|w*/JK\Z Next k lX98"} Lh8bQH Next j >H0) ph
eeW' [ Next i JkSdLj EnableTextPrinting( True ) JcTp(fnW.~ F . K2 'write out file dSOlD/c
fullfilepath = CurDir() & "\" & fname QP6z?j. Open fullfilepath For Output As #1 24T@N~\g Print #1, "GRID " & nx & " " & ny Aautih@LX Print #1, "1e+308" *2JH_Cj` Print #1, pixelx & " " & pixely ds*m6#1b Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ,c4c@|Bh? *:=];1O maxRow = nx - 1 I86e&"40 maxCol = ny - 1 uP{;*E3? For rowNum = 0 To maxRow ' begin loop over rows (constant X) LXHwX*`Y row = "" )t|^Nuj8 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) .A3DFm3 t row = row & irrad(colNum,rowNum) & " " ' append column data to row string X^zYQ6t Next colNum ' end loop over columns h [nH<m r1i$D Print #1, row 1&"-*) <Ctyht0c. Next rowNum ' end loop over rows "'['(e+7 Close #1 #F_'}?09% [RAj3Fr0 Print "File written: " & fullfilepath # v.L$7O Print "All done!!" q1YLq(e End Sub `kv1@aQPL Q`H#
fS~ 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: blJIto' ZhH+D`9 [^<SLTev 找到Tools工具,点击Open plot files in 3D chart并找到该文件 "XCU'_k= pG/
NuImA ;aq `N}d 打开后,选择二维平面图: l iw,O 6 CV '&4oq
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