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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。 ,Bh!|H(?L1 A[QUFk( 成像示意图 5~&9/ALk5 首先我们建立十字元件命名为Target ;Z]i$Vi_r ETk4I" 创建方法: XB ]A oRK=aH 面1 : HGqT"NJr 面型:plane 1}1.5[4d 材料:Air ?@"F\Bv<h 孔径:X=1.5, Y=6,Z=0.075,形状选择Box P]]re,&R ! d Ns3d QcBuUFf!c 辅助数据: H_gY)m 首先在第一行输入temperature :300K, m$^Wyk} emissivity:0.1; _;baZ- kSJWXNC +"1@6,M 面2 : l-` M
9# 面型:plane X|!VtO 材料:Air ziUEA>m*/ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ;.$AhjqiP N y_d $yG>=GN 位置坐标:绕Z轴旋转90度, b1An2e[ \;&WF1d`ac lYz{#UX} 辅助数据: om6'%nXhn Ox.6]W~ 首先在第一行输入temperature :300K,emissivity: 0.1; uE {r09^q\ nf#;]FijB e}%~S9\UL5 Target 元件距离坐标原点-161mm; 9<qAf` Nn/me )b^yAzL? 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ^0oOiZs VX+:k.} \@")2o+ 探测器参数设定:
DZPg|*KT ?` ?HqR0 在菜单栏中选择Create/Element Primitive /plane #-T xhwYs U^aMh- /2 V AlZ]UGf^ 5d ?\>dA WC2sRv4]3 元件半径为20mm*20,mm,距离坐标原点200mm。 3zC<k2B dMn0nc+ 光源创建: A7U]wW9 +5AWX,9,- 光源类型选择为任意平面,光源半角设定为15度。 -M\ae !2YvG%t^6 GYp}V0 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。 p./9^S
. W ~&d_n 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。 ,O`a_b] .7GTL =;HC7TUM& 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。 -@=As00Bg fXo$1! 创建分析面: PBkTI2 v 3MqyHOOv o8uak*"{ 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。 4i]h0_]
r Uau?? &YiUhK 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。 ,)u1r3@I^ TwdY6E3` FRED在探测器上穿过多个像素点迭代来创建热图 5/w4[d $"e$#<g 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。 (U`<r-n\n 将如下的代码放置在树形文件夹 Embedded Scripts, zDD Ms>CO7Nvy t=(d, kf 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。 B>]4NF\)H9 >6X$iBb0 绿色字体为说明文字, ZovF]jf k lf`" (:./ '#Language "WWB-COM" dbe\ YE 'script for calculating thermal image map kleE\8_ 'edited rnp 4 november 2005 IuV7~w _P}wO8 'declarations {JGXdp:SB Dim op As T_OPERATION 7T69tQZ< Dim trm As T_TRIMVOLUME ;Q.'u Dim irrad(32,32) As Double 'make consistent with sampling QgF2f/;! Dim temp As Double u{J\X$] Dim emiss As Double f%[0}.wp Dim fname As String, fullfilepath As String }5b,u6 rbw~Ml0 'Option Explicit /mK."5-cm RKb{QAK!v Sub Main )\PPIY>iP 'USER INPUTS 8"=E0(m nx = 31 52P^0<Wq ny = 31 Tebu?bj numRays = 1000 zk m#w minWave = 7 'microns 2Q;g|*] maxWave = 11 'microns wn Q% 'Eo sigma = 5.67e-14 'watts/mm^2/deg k^4 rds4eUxe fname = "teapotimage.dat" APUpqY JT cE{i Print "" 1lLXu Print "THERMAL IMAGE CALCULATION" N2uTWT> -n"7G%$M detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 UA3!28Y&E3 Q=u [j|0mc Print "found detector array at node " & detnode $aC%&&+wG {>h,@ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ]|8*l]oc FT;I|+H*P Print "found differential detector area at node " & srcnode !*!i&0QC~R *|B5,Ey GetTrimVolume detnode, trm j
V'~> detx = trm.xSemiApe D6fGr$(N% dety = trm.ySemiApe dF+R
q|n{ area = 4 * detx * dety GLiD,QX< Print "detector array semiaperture dimensions are " & detx & " by " & dety Hd ${I", Print "sampling is " & nx & " by " & ny [A'9sxG vSv:!5* 'reset differential detector area dimensions to be consistent with sampling h[& \OD,P pixelx = 2 * detx / nx 82P#C4c+d pixely = 2 * dety / ny 9jJ:T$} SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ekPn`U Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 .2f0e[J QI4a@WB]ok 'reset the source power )YPut. SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) #9/S2m2\YG Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 7J|eL
yj RD6`b_]o 'zero out irradiance array A 6j>KTU For i = 0 To ny - 1 MT^krv(G For j = 0 To nx - 1 t@cImmh\T irrad(i,j) = 0.0 Ou5,7Ne Next j nV_[40KP_ Next i *n*po.Xr O[5u6heNMr 'main loop Senb_? EnableTextPrinting( False ) w1,6%?p(O P~@.(hed ypos = dety + pixely / 2 qlg?'l$03) For i = 0 To ny - 1 %Hpz^<` xpos = -detx - pixelx / 2 8C4v ypos = ypos - pixely pKhV<MFB NGAjajB EnableTextPrinting( True ) - -ZSl Print i 9V?:!%J EnableTextPrinting( False ) nD!5I@D Lb0B m R%0 *GC9o/ For j = 0 To nx - 1 ~IS3i'bh ]GmXZi xpos = xpos + pixelx QvDD
X0BBJ( e 'shift source *:,y`!F=y LockOperationUpdates srcnode, True i3<ZFR GetOperation srcnode, 1, op (I ~r~5^ op.val1 = xpos /F_(&H!m op.val2 = ypos !A#(bC SetOperation srcnode, 1, op P7y.:%DGD0 LockOperationUpdates srcnode, False *v0}S5^/" o(3`-ucD` raytrace *K=Yrisz DeleteRays [8rl{~9E CreateSource srcnode F:cenIaBF TraceExisting 'draw > m##JzWLr RrRE$g 'radiometry iNEE2BPp For k = 0 To GetEntityCount()-1 BLcsIyq If IsSurface( k ) Then w<G'gi] temp = AuxDataGetData( k, "temperature" ) B$&&'i% emiss = AuxDataGetData( k, "emissivity" ) Qh!h "] If ( temp <> 0 And emiss <> 0 ) Then wf/DLAC ProjSolidAngleByPi = GetSurfIncidentPower( k ) #(o( p frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) PXDwTuyc irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi j[&C6l+wH End If -: 8[ YY9Ub End If IWP[?U= /+{1;}AT Next k 9/4Bx!~A "6xTh0D
Next j zR6^rq* {,
zg Next i "bk'#?9 EnableTextPrinting( True ) }@NT#hD `'}c-
Q 'write out file jjU("b= fullfilepath = CurDir() & "\" & fname $+Zj)V( Open fullfilepath For Output As #1 *pKj6x Print #1, "GRID " & nx & " " & ny RMO6k bfP Print #1, "1e+308" 2:Rxyg@' Print #1, pixelx & " " & pixely [XDr-5Dm Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 s5D<c'- E@D}Sqt maxRow = nx - 1 .80L>0 maxCol = ny - 1 D_-<V,3t For rowNum = 0 To maxRow ' begin loop over rows (constant X) ["
nDw<U row = "" O"~BnA`dJ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) HzD=F3\r| row = row & irrad(colNum,rowNum) & " " ' append column data to row string iTg7@% Next colNum ' end loop over columns *u?N{LkqS /{+77{#Qn Print #1, row 0
|Y'@& -3eHJccB Next rowNum ' end loop over rows oar`xH$C Close #1 k{d)'\FM 8
!+eq5S3 Print "File written: " & fullfilepath A3c&VT6Q Print "All done!!" m-)yQM8 End Sub $ H2HVJ 84UI)nE:Q 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: eE-c40Bae 4.}J'3 . v|K<3@J 找到Tools工具,点击Open plot files in 3D chart并找到该文件 s^Wh!:>r/ L#X!. =x3ZQA 打开后,选择二维平面图: 9;k!dM !
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