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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。 HGDVOJq &ak6zM 成像示意图 :w-`PYJ%G 首先我们建立十字元件命名为Target y' x F0 |4b)>8TL/ 创建方法: 7*+TP~WI or?%-) 面1 : BWUq%o,@g 面型:plane 'Ud|Ex@A9 材料:Air ..KwTf 孔径:X=1.5, Y=6,Z=0.075,形状选择Box c^.l2Q! LSd*|3E}n g+[kde;(^ 辅助数据: fA^Em)cs2 首先在第一行输入temperature :300K, 5lmO:G1 emissivity:0.1; ``QHG&$/ uV]ULm#,i (ku5WWJ 面2 : NHaMo*xQ 面型:plane ;b%{ilx: 材料:Air XutF"9u 孔径:X=1.5, Y=6,Z=0.075,形状选择Box JMyTwj[7 bEH
de*q( %XRN]tsu 位置坐标:绕Z轴旋转90度, H;KDZO9W e~\QE0Oe : R>)MiHcCg 辅助数据: hWEnn=BW @}LZ! y 首先在第一行输入temperature :300K,emissivity: 0.1; %|"Qi]c d 1B:aC|B lZ+!H=` Target 元件距离坐标原点-161mm; E5G{B'%j 2(#Ks's? =dH$2W)G 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 @h9MxCE! M] EsS^/X 4A.Q21s 探测器参数设定: tIZ~^*' f~M8A. 在菜单栏中选择Create/Element Primitive /plane Fi;VDK(V9 T] | d5E 'fW#7W -q>^ALf|@> r6.N4eW.L Kn}ub+
"J 元件半径为20mm*20,mm,距离坐标原点200mm。 ^^?q$1k6r* \L]|-f(4 光源创建: mP}#Ccji? T~>#2N-Z 光源类型选择为任意平面,光源半角设定为15度。 (.X]F_*sc d>i13dAI l\Ftr_Dk 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 Jh@_9/? t9
F=^)s 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 Px;Cg
6 v.g"{us v[ ,Src 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 X;GfPw.m i@$*Csj\9* 创建分析面: \U @3` %u!XzdG "QY1.:o<( 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。 /9 hR zK5bO=0j f`P9ku#j} 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。 C7qYiSv
9f+RAN( FRED在探测器上穿过多个像素点迭代来创建热图 D<):ZfUbI ,0?!ov| 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。 ujzW|HW^v 将如下的代码放置在树形文件夹 Embedded Scripts, 1/iE`Si 3N4.$#>#9@ 46XN3r 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 Pv){sYUh Fb_S&! 绿色字体为说明文字, PZOKrW v 81rfB5 '#Language "WWB-COM" F[E?A95W 'script for calculating thermal image map ><Z'D 'edited rnp 4 november 2005 ;e{5)@h$ ef]B9J~h 'declarations fE25(wCz7 Dim op As T_OPERATION }T(z4P3 Dim trm As T_TRIMVOLUME ;u!?QSvb
Dim irrad(32,32) As Double 'make consistent with sampling ])T/sO#' Dim temp As Double V2 `>
]/| Dim emiss As Double 8T5k-HwE Dim fname As String, fullfilepath As String e!0OW7kV w~@[r4W 'Option Explicit n["
9| _l&ucA Sub Main /1.rz{wpb 'USER INPUTS OyVm(%Z
nx = 31 P Jo ny = 31 ; B$*)X9 numRays = 1000 &3DK^|Lq minWave = 7 'microns dOXD{c maxWave = 11 'microns TOT
PzB sigma = 5.67e-14 'watts/mm^2/deg k^4 .Q\\dESn" fname = "teapotimage.dat" '2v f|CX 3H8Al Print "" e}"wL g] Print "THERMAL IMAGE CALCULATION" !nw[ <GZhH: detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 (F&YdWe: m|4LbWz Print "found detector array at node " & detnode A3yi?y{[* |uUuFm srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 F(4yS2h( Zu#< Print "found differential detector area at node " & srcnode DY3:#X`4 qgexb\x\4 GetTrimVolume detnode, trm Eo=HNe detx = trm.xSemiApe 0XIxwc0Iw dety = trm.ySemiApe z8iENECwj area = 4 * detx * dety T$c+m\j6 Print "detector array semiaperture dimensions are " & detx & " by " & dety {D(,ft;s^ Print "sampling is " & nx & " by " & ny RVF F6N^ 4iBxPo(0 'reset differential detector area dimensions to be consistent with sampling A{`]&K1u pixelx = 2 * detx / nx s]x2DH+_ pixely = 2 * dety / ny FfYsSq2l SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False /'&v4C^y> Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 !5.v'K' !-(J-45 'reset the source power ^5x4 q SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) JQT4N[rEE Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" >hb-5xC @ ;J|xkJ 'zero out irradiance array wE2x:Ge: For i = 0 To ny - 1 A- 0m8< For j = 0 To nx - 1 o*_g$ irrad(i,j) = 0.0 3"tg+DncC Next j 0w}{(P; Next i &kx\W) uI9lK 'main loop "1%*'B^}bw EnableTextPrinting( False ) v=Mz I#0L
5KaSWw/ ypos = dety + pixely / 2 W-XN4:,qI For i = 0 To ny - 1 C->[$HcRa xpos = -detx - pixelx / 2 8Mb$+^zU ypos = ypos - pixely R `Q?J[e yu_gNro L EnableTextPrinting( True ) Eq7gcDQ Print i h@Dw'w EnableTextPrinting( False ) 1gAc,s2 gTD%4V YiNo#M91 For j = 0 To nx - 1 vGyppm[0 Tvrc%L(] xpos = xpos + pixelx nOr"K;C qAvvXs=5 'shift source 2dyxKK!\a LockOperationUpdates srcnode, True skSNzF7' GetOperation srcnode, 1, op qL~Pjr>cF op.val1 = xpos ?a8nz, zb op.val2 = ypos 8fEAYRGd SetOperation srcnode, 1, op W7]mfy^ LockOperationUpdates srcnode, False dcR6KG 8 3]7ipwF2q raytrace 6(sfpK' DeleteRays 2}@*Ki7 CreateSource srcnode ^CX,nj_( TraceExisting 'draw /gF]s_ LA>dkPB 'radiometry 8ZzU^x For k = 0 To GetEntityCount()-1 -KA4Inn]5 If IsSurface( k ) Then `F@f?*s: temp = AuxDataGetData( k, "temperature" ) roL]v\tr emiss = AuxDataGetData( k, "emissivity" ) Z%A<#% If ( temp <> 0 And emiss <> 0 ) Then $q.p$JQ: ProjSolidAngleByPi = GetSurfIncidentPower( k ) 7TR'zW2W frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) k0=|10bi irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi eb(m8vLR End If ap{{(y&R [)bz6\d[ End If
bsD'\ s}<)BRZi Next k Q0_M-^~WT UU-v;_oP Next j s2wwmtUCN >DkN+S Next i 8UlB~fVg EnableTextPrinting( True ) 7Im}~3NJG FC~|& 'write out file WJBW: 2=; fullfilepath = CurDir() & "\" & fname zww? Open fullfilepath For Output As #1 1h&)I%`? Print #1, "GRID " & nx & " " & ny ~rQ4n9G Print #1, "1e+308" i:AjWC@] Print #1, pixelx & " " & pixely nqUH6( Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 56VE[G lS>=y#i3Xv maxRow = nx - 1 8UjCX[v maxCol = ny - 1 DKf}47y For rowNum = 0 To maxRow ' begin loop over rows (constant X) hVROzGZk row = "" ^ON-# For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) LZ3rr- row = row & irrad(colNum,rowNum) & " " ' append column data to row string aEV|>K=6Y' Next colNum ' end loop over columns vK[v
eFH Ma
n^\gkCi Print #1, row F%Ro98?{ 2M!+gk=+ Next rowNum ' end loop over rows 1"*Nb5s Close #1 N}eU.#L VGkW3Nt0 Print "File written: " & fullfilepath Q'>_59 Print "All done!!" :XNK-A W End Sub 6:8EZ'y 7H/!rx 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: S]Yu6FtWiO )1X' W ]QjXh> 找到Tools工具,点击Open plot files in 3D chart并找到该文件 HCfS)` Cnb[t[hk+j \H"/2o%l") 打开后,选择二维平面图: 5)/4)0 'd~, o[x
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