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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。 1ygpp0IGJ I^o!n5VM 成像示意图 G:x*BH+ 首先我们建立十字元件命名为Target qV5DW0. s1|/S\ 创建方法: \{Q?^E Y#!h9F 面1 : XqM3<~$ 面型:plane =^H4 Yck/5 材料:Air Sq:0w 孔径:X=1.5, Y=6,Z=0.075,形状选择Box cRX~z 5[j`6l NrP0Ep%V 辅助数据: d #jK=:eK 首先在第一行输入temperature :300K, 3\T2?w9u( emissivity:0.1; 7d92Pe ''\;z<v eNiaM6(J 面2 : &rkEK4 面型:plane (C]o,7cYS 材料:Air i#%aTRKHd6 孔径:X=1.5, Y=6,Z=0.075,形状选择Box v]B
L[/4 ie-vqLc nx0K$Ptq 位置坐标:绕Z轴旋转90度, DcSnia62f 5Sk W-+$ iAa;6mH 辅助数据: eAPXWWAZJ1 j5@:a 首先在第一行输入temperature :300K,emissivity: 0.1; <AJ97MLcc ;-UmY}MU \QU^>23 Target 元件距离坐标原点-161mm; dg4vc][ OT'[:|x ; };'\~g,1 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 dL|+d:v d#2$!z# wcDRH)AW. 探测器参数设定: m|OO,gR %'0TXr$ 在菜单栏中选择Create/Element Primitive /plane Pz$R(TV tE7[Smzuf 6"dD2WV/ .jMq v9T_& JI vo_7{ 元件半径为20mm*20,mm,距离坐标原点200mm。 bTQNb!& <V>dM4Mkr 光源创建: B:7mpSnEQ }B~If}7 光源类型选择为任意平面,光源半角设定为15度。 {\[5}nV ZoArQ(YFy +VQ\mA59 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。 )&
u5IA( vzmc}y G 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。 S;]*) i,v Hr$QLtr /rSH"$ 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。 [V:\\$ tnLAJ+-M 创建分析面: ^wS5>lf7p `Qeg +Jr|z\ 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。 }pJwj ;j2vHU#q- -kbg\,PW 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。 @Vu(XG c_elShK8# FRED在探测器上穿过多个像素点迭代来创建热图 eilYA_FL. \(%Y%?dy 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。 B-l'vVx 将如下的代码放置在树形文件夹 Embedded Scripts, YM
DMH"3 H'HSD,>( >|;aIa@9 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。 ;`6^6p\p qpXWi
&g 绿色字体为说明文字, -1J[n0O. fNrgdfo '#Language "WWB-COM" 2=_gf 'script for calculating thermal image map }K3x 'edited rnp 4 november 2005 ~/*MY GaSPJt 'declarations @Pt="*g Dim op As T_OPERATION H@l}WihW Dim trm As T_TRIMVOLUME LQjsOo Dim irrad(32,32) As Double 'make consistent with sampling 6"}?.E$ Dim temp As Double 5YrBW:_OI Dim emiss As Double 5#K4bA Dim fname As String, fullfilepath As String #UbF9})q l<N}!lG| 'Option Explicit RZ+`T+zL /d%=E Sub Main G\(|N9^: 'USER INPUTS H<3I 5Kgt nx = 31 M|Rb&6O ny = 31 |DsnNk0c numRays = 1000 7.`fJf? minWave = 7 'microns Phke`3tth maxWave = 11 'microns f;b[w sigma = 5.67e-14 'watts/mm^2/deg k^4 h*v8#\b$J_ fname = "teapotimage.dat" nvPwngEQm g1(IR)U!z Print "" >vA2A1WhW Print "THERMAL IMAGE CALCULATION" AA7C$;Z15~ #_u~/jhX detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 F>rH^F r9dyA5oD Print "found detector array at node " & detnode rOVVL%@QqJ hvaSH69*m srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ,I,\ml
p3^m9J Print "found differential detector area at node " & srcnode /gG"v5] JeE;V![ GetTrimVolume detnode, trm yNTK . detx = trm.xSemiApe v;ZA4c dety = trm.ySemiApe rh^mJUh area = 4 * detx * dety j*vYBGD Print "detector array semiaperture dimensions are " & detx & " by " & dety )>Yu!8i Print "sampling is " & nx & " by " & ny b1($R[ ^N)R=tl 'reset differential detector area dimensions to be consistent with sampling y_?Me] pixelx = 2 * detx / nx ){b@}13cF pixely = 2 * dety / ny :*KHx|Q SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False _D+J!f^ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 .Fp4:
e hr)B[<9 'reset the source power v%iflCK SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) tw9f%p Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" %B.yW`,X {.INnFGP@) 'zero out irradiance array (R("H/6xs For i = 0 To ny - 1 EU+S^SyZi For j = 0 To nx - 1 LBZ+GB irrad(i,j) = 0.0 av|g}xnj Next j &eX!#nQ_. Next i W*I(f]8:y` Iepsz 'main loop V6,H}k EnableTextPrinting( False ) Ev}C<zk* #^ A* ypos = dety + pixely / 2 @W"KVPd For i = 0 To ny - 1 ]Yn_}Bq xpos = -detx - pixelx / 2 ~G6Ox)/ ypos = ypos - pixely /x
p| JAem0jPC8 EnableTextPrinting( True ) GVYkJ0, Print i _dhgAx-H)h EnableTextPrinting( False ) #6HA\dE 1^}[&ar MjC_ ( cs For j = 0 To nx - 1 y1+*6| >E{";C) xpos = xpos + pixelx abfW[J )x=1]T>v"' 'shift source ~yW4)4k;b LockOperationUpdates srcnode, True P 'od` GetOperation srcnode, 1, op c2'Lfgx4 op.val1 = xpos TI,&!E?; op.val2 = ypos
:7]Sa` SetOperation srcnode, 1, op _)>_{Pm LockOperationUpdates srcnode, False (Hb:?( >8#X;0\Kj raytrace (G;lx DeleteRays 3@$,s~+ 3 CreateSource srcnode g'n7T|h
~ TraceExisting 'draw biU^[g(" ?En O"T. 'radiometry MS
81sN\d For k = 0 To GetEntityCount()-1 2Ay*kmW If IsSurface( k ) Then Enn"hdI temp = AuxDataGetData( k, "temperature" ) /)}q Xx& emiss = AuxDataGetData( k, "emissivity" ) E%,^Yvh/ If ( temp <> 0 And emiss <> 0 ) Then &-Gqdnc ProjSolidAngleByPi = GetSurfIncidentPower( k ) xg;+<iW frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) j2StXq3 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi Kzm+GW3o[ End If %Q
fO8P Y4`}y-'d End If YA_c
N5p/@ ?R$F)g7< Next k bB1UZ O d\|?-hY`[ Next j )f[
B6Y 0uOkMuy< Next i K<SyC54 EnableTextPrinting( True ) ,*&:2o_r (3Two} 'write out file q1"$<# t fullfilepath = CurDir() & "\" & fname -$cmG4 Open fullfilepath For Output As #1 KWowN; Print #1, "GRID " & nx & " " & ny !Sh&3uy_qN Print #1, "1e+308" 4C61GB?Vy Print #1, pixelx & " " & pixely ~obqG!2m Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 jHE}qE~>5 w[zjerH3 maxRow = nx - 1 v1+3}5b'uF maxCol = ny - 1 IEsEdw]aZE For rowNum = 0 To maxRow ' begin loop over rows (constant X) p.v0D:@& row = "" `>f6)C- For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) e,vvzso row = row & irrad(colNum,rowNum) & " " ' append column data to row string K/j3a[. Next colNum ' end loop over columns *`ua'"="k V3Q+s8OIF Print #1, row "U>JM@0DNm aeFe!`F Next rowNum ' end loop over rows eg\v0Y!rI Close #1 Ce9|=Jx! &:9cAIe]H Print "File written: " & fullfilepath 4sF"6+%5d Print "All done!!" MDhRR*CBh End Sub zZPuha8 DCIxRPw 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: %Gz0^[+ R_W+Ylob Fq~yL!#! 找到Tools工具,点击Open plot files in 3D chart并找到该文件 J%v=yBC2 J>wt(] y 3G,Oba[$< 打开后,选择二维平面图: `#F{Waww' R]c+?4J
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