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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。 Hd~fSXFl KRj3??b 成像示意图 nZkMyRk 首先我们建立十字元件命名为Target +D#.u^ i &,1 创建方法: DOWZhD wW'.bqA 面1 : izr
3{y5 面型:plane sQa9M 材料:Air ltmD=-]G_ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box :j%
B(@b ; HjT O:[@?l 辅助数据: >tV:QP]Y 首先在第一行输入temperature :300K, 1?#Wg>7' emissivity:0.1; q&EwD(k 'J#uD|9) HAMps[D[ 面2 : PAy7b7m~B 面型:plane P,SI0$Z 材料:Air VV=6v;u` 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Y@V6/D} 1 Bd*\|M I$Fr8R$ 位置坐标:绕Z轴旋转90度, I6F $@ 2dBjc{ D$bJ s O 辅助数据: bn"z&g BjbpRQ, 首先在第一行输入temperature :300K,emissivity: 0.1; M9sB2Ips< ~Uaz;<"j0 #h7$b@ Target 元件距离坐标原点-161mm; B7BikxUa Dlu]4n[LB =`BPGfCb 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Xw9"wAj 9 kS;_(DB -;o`(3wZq 探测器参数设定: >oc&hT rZ7)sE5L 在菜单栏中选择Create/Element Primitive /plane =J&aN1Hgt N`i`[ f -` e`U%n 9IG3zM f E 5bo60z ~m@w p 元件半径为20mm*20,mm,距离坐标原点200mm。 z`+j]NX] I45\xP4i 光源创建: >d#6qXKAU ||sj*K 光源类型选择为任意平面,光源半角设定为15度。 AA0zt N <\S
j5 xDBHnr}[ 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ,4z?9@wQ Yo#F ;s7 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 AehkEN&H/t Y=N; Bj QG=&{-I~[3 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 HxH=~B1"P ;Cqjg.wkB 创建分析面: vxC,8Z 66~]7w Ayi
Uz 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 ym)`<[T .Qeml4(`3 GCEq3
^/ 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 /!Kl (Eoji7U FRED在探测器上穿过多个像素点迭代来创建热图 aF\?X&| Z'sO9Sg8> FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 y:+s*x6Vg 将如下的代码放置在树形文件夹 Embedded Scripts, g$ oe00b nob^
I5? `L=$,7` 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 lhA<wV1-9G J]|lCwF 绿色字体为说明文字, p;rGaLo:u q#~]Hp=W5 '#Language "WWB-COM" VX;tglu2 'script for calculating thermal image map D;0xROW8{ 'edited rnp 4 november 2005 _}B:SM B:\TvWbu 'declarations KGm"-W Dim op As T_OPERATION -f-2!1&<3h Dim trm As T_TRIMVOLUME 21BlLz Dim irrad(32,32) As Double 'make consistent with sampling sR. ecs+ Dim temp As Double q:1_D> Dim emiss As Double 61J01(+| Dim fname As String, fullfilepath As String AQ 5CrYb o=
%Fh 'Option Explicit :bA@
u> Y(]&j`% Sub Main 9)qjW &` 'USER INPUTS \k|ZbCWg nx = 31 &,Xs=Lvmq ny = 31 .#b! # numRays = 1000 k'BLos1W minWave = 7 'microns ^m
maxWave = 11 'microns ^E7>!Lbvx sigma = 5.67e-14 'watts/mm^2/deg k^4 Tdr^~dcQ fname = "teapotimage.dat" j}?O F=hfbCF5x Print "" gi7As$+E Print "THERMAL IMAGE CALCULATION" I^{PnrB {O,Cc$_ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 |^ml|cb <L__;j1Wx Print "found detector array at node " & detnode 1b'1vp t
_Q/v srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 y\Z-x eb)S<%R/ Print "found differential detector area at node " & srcnode `
m`Sl[6 iw(\]tMt GetTrimVolume detnode, trm d+|8({X]D8 detx = trm.xSemiApe -NVk>ENL4 dety = trm.ySemiApe 5|-(Ic area = 4 * detx * dety )^^r\ Print "detector array semiaperture dimensions are " & detx & " by " & dety O329Bkg Print "sampling is " & nx & " by " & ny 0n_Cuh\ %xR;8IO 'reset differential detector area dimensions to be consistent with sampling 3Nh;^ pixelx = 2 * detx / nx mLO{~ruu pixely = 2 * dety / ny P,O9On SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False cmu5KeH Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 O;:8mm%( UG+wRX :dA 'reset the source power ?#\?&uFJ} SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ~2~KcgPsq Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" d*1@lmV* r&\}E+ 'zero out irradiance array ]P ->xJ For i = 0 To ny - 1 0}Xkj)R, For j = 0 To nx - 1 "_C^Bc irrad(i,j) = 0.0 y-"*[5{W Next j $xS `i-| Next i u9>.x
zYG oa`,|dA" 'main loop $<]y.nr|CX EnableTextPrinting( False ) QHsS|\u y6;'?.Y1 ypos = dety + pixely / 2 1`m ~c For i = 0 To ny - 1 `2NL'O: xpos = -detx - pixelx / 2 }{Lf 4|8 ypos = ypos - pixely gW6lMyiLb qrNW\ME EnableTextPrinting( True ) i[^?24~ c Print i _q=$L
eO5 EnableTextPrinting( False ) 7s5?^^ @dJ
s uwWfL32 For j = 0 To nx - 1 i2$U##-ro] (1(3:)@S6 xpos = xpos + pixelx d+ih]? S53 [Ja 'shift source =X>3C"] LockOperationUpdates srcnode, True "~7| !9< GetOperation srcnode, 1, op F)_Rs5V:( op.val1 = xpos *H&a_s/{Nb op.val2 = ypos rg_-gZl8&z SetOperation srcnode, 1, op kd'qYh LockOperationUpdates srcnode, False =}r&>|rrJ /43DR;4 raytrace kzns:-a DeleteRays Gr?"okaA CreateSource srcnode YT,1E>rd TraceExisting 'draw 1w+&Y;d| rgIJ]vmy<H 'radiometry 8o4<F%ot For k = 0 To GetEntityCount()-1 aiw~4ix If IsSurface( k ) Then o|l)oc6{ temp = AuxDataGetData( k, "temperature" ) DD|%F emiss = AuxDataGetData( k, "emissivity" ) KzeA+PI If ( temp <> 0 And emiss <> 0 ) Then 6l [TQ ProjSolidAngleByPi = GetSurfIncidentPower( k ) d)r=W@tF] frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ;b
cy(Fp,\ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi w*#k&N[X End If Fdu0?H2TL G5=(3 V% End If ^lRXc.c z 2;[75(l6|} Next k -1S+fUkiK/ ID'@}69.S Next j >V87#E s4MP!n?gB Next i {E6b/G?Q
EnableTextPrinting( True ) wxo( n?Gm 5## 'write out file *qY`MW fullfilepath = CurDir() & "\" & fname yql+N[ Open fullfilepath For Output As #1 ^o:0 Y}v= Print #1, "GRID " & nx & " " & ny gl.P#7X Print #1, "1e+308" z ;y22 Print #1, pixelx & " " & pixely Sqc*u&W Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 t}nZrD ?)4|WN|c_ maxRow = nx - 1 1x M&"p: maxCol = ny - 1 $L:g7?)k For rowNum = 0 To maxRow ' begin loop over rows (constant X) wc~a}0uz row = "" RS<c&{? For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) xE;fM\7pu row = row & irrad(colNum,rowNum) & " " ' append column data to row string ]4uIb+(S Next colNum ' end loop over columns fRaVY`|wK 8-juzL} Print #1, row dW8'$!@!! B`RbXk68q Next rowNum ' end loop over rows
6=A++H@ Close #1 :$/lGIz +Z)||MR" Print "File written: " & fullfilepath <diI*H<G Print "All done!!" $Xz9xzOR End Sub cQgmRHZ] jh\q2E~,` 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: nF
A7@hsm 4X#>; RG:ct{i 找到Tools工具,点击Open plot files in 3D chart并找到该文件 YaSwn3i/@S A3'i
- 6prN,*k5 打开后,选择二维平面图: G-M!I`P 6<]&T lS]
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