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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。 xcfEL_'o "`Q~rjc$2 成像示意图 2<Lnfc<^k 首先我们建立十字元件命名为Target F"xD^<i F8S -H" 创建方法: Y85M$]e, >YuBi:z 面1 : `(A>7;]: 面型:plane ia!t~~f 材料:Air _W]qV2j 孔径:X=1.5, Y=6,Z=0.075,形状选择Box h32QEz-+ (i4=}Kn2 *9((X,v@/ 辅助数据: x_lCagRGC4 首先在第一行输入temperature :300K, zk8s?$ emissivity:0.1; VH1PC -d?9Acd o9-b!I2 面2 : ?2l#=t?PP 面型:plane B:dk>$>uQ 材料:Air E,,)?^ g 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Hm@+(j(N96 -?gr3rV@ is K~= 位置坐标:绕Z轴旋转90度, ZaQgSE>Y INZycNqm, ](yw2c;me 辅助数据: jO\29(_ FWqnlK# 首先在第一行输入temperature :300K,emissivity: 0.1; '3B`4W, 4G;FpWQm Htn'(Q Target 元件距离坐标原点-161mm; NQzpgf|h uKF?UXc ,Oojh;P_ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 !HyPe"`oL +-~hl dj,7lJy 探测器参数设定: 5^lroC-(x 9B&QY 2v 在菜单栏中选择Create/Element Primitive /plane @cNBY7= cbvK;; 7Yp;B:5@ 't".~H_V JEq0 {_7 nHxos`Qx 元件半径为20mm*20,mm,距离坐标原点200mm。 gIv :<EJ9 UO(B>Abp 光源创建: F4+mkB:w*7 O8#}2 光源类型选择为任意平面,光源半角设定为15度。 Bs2.$~ m[S6pqz 1.WdxMpW9 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。 Z'c{4b`N t/z]KdK P 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。 ?d`?Ss;v W70J2 Ql8E9~h 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。 /VB n OMG.64DX . 创建分析面: @a,X{0 DueQ1+ P q]Gym 7o 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。 DE3>F^ j h*2Q0GRX m)4s4P57y 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。 ]UyIp`nV; is&A_C7yg FRED在探测器上穿过多个像素点迭代来创建热图 pC,MiV$c" }5dYmny FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 Y~]E6'Bz 将如下的代码放置在树形文件夹 Embedded Scripts, cF{5[?wS -.ITcDg )2T?Z)"hO 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 bv$g$ Hb5^+.xur 绿色字体为说明文字, q)R&npP7 lV!ecJw$ '#Language "WWB-COM" b}'XDw 'script for calculating thermal image map #UGtYD}" 'edited rnp 4 november 2005 .zr2!}lB *k'D%}N: 'declarations J \U}U'qP Dim op As T_OPERATION krwY_$q Dim trm As T_TRIMVOLUME c]jK
Y< Dim irrad(32,32) As Double 'make consistent with sampling n,sl|hv2U Dim temp As Double +P,hT Dim emiss As Double 'c[4-m3bg Dim fname As String, fullfilepath As String ^G'8!!ys 7m0sF<P{g 'Option Explicit D-*`b&i48 $7~k#_#PC Sub Main ?,e7v.b 'USER INPUTS *IWO ,! nx = 31 3Gi#WV4$ ny = 31 prE~GO7Z numRays = 1000 VD+TJ` r minWave = 7 'microns [.;$6C/? maxWave = 11 'microns N'_,VB sigma = 5.67e-14 'watts/mm^2/deg k^4 xsS/)R? fname = "teapotimage.dat" {M:Fsay>p aWhhq@ Print "" ?2hoY Print "THERMAL IMAGE CALCULATION" HU]Yv+3 tWL3F?wd detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 cA%70Y:AV +r[u4? Print "found detector array at node " & detnode 7eb^^a? 3~H_UGw srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 88~BE ^ B0I(/ 7 Print "found differential detector area at node " & srcnode Lf _`8Ux t4)~A5s GetTrimVolume detnode, trm qPsf`nI7 detx = trm.xSemiApe r@L19d)J dety = trm.ySemiApe pk2OZ,14Mj area = 4 * detx * dety 5D0O.v Print "detector array semiaperture dimensions are " & detx & " by " & dety {8D`A;KD Print "sampling is " & nx & " by " & ny > ?s[g)np `.Z MwA 'reset differential detector area dimensions to be consistent with sampling 5{cbcuG pixelx = 2 * detx / nx >#).3 pixely = 2 * dety / ny )G6{JL-I SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False d
dB}mk6 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 F VBuCi?W UZsL0 'reset the source power SS OF\ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) $%!'c#
F Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" E5 "%-fAJ (+}H
ih 'zero out irradiance array dcUaZfON For i = 0 To ny - 1 l;^Id#N For j = 0 To nx - 1 fT1/@ irrad(i,j) = 0.0 {HPKp&kl Next j y]$%>N0vLX Next i gj{2"tE 1,,kU 'main loop !v(j#N< m EnableTextPrinting( False ) 0<"4W: Hq'mv_}qG ypos = dety + pixely / 2 M qq/k J For i = 0 To ny - 1 `tKrTq> xpos = -detx - pixelx / 2 RWM9cV5 ypos = ypos - pixely =Tv;?U C X5i?Bb. EnableTextPrinting( True ) %9ef[,WT Print i KS%LX c(' EnableTextPrinting( False ) 5tUp[/]pl &u)
R+7bl, .Bxv|dji For j = 0 To nx - 1 \IB@*_G uCGJe1!Ai> xpos = xpos + pixelx tow0/Jt *
S4IMfp 'shift source apsR26\^ LockOperationUpdates srcnode, True h:{rjXK
GetOperation srcnode, 1, op j} ^?3< op.val1 = xpos 7=yV8.cD op.val2 = ypos x {Z_rD SetOperation srcnode, 1, op .$nQD.X LockOperationUpdates srcnode, False *`.h8gTD, =+24jHs 'raytrace :l~^un|<2Y DeleteRays "b)Y 5[nW CreateSource srcnode 4cC TraceExisting 'draw )`;Q]?D wyF'B 'radiometry dqd:V$o For k = 0 To GetEntityCount()-1 8 w-2Q If IsSurface( k ) Then 1.p2{ temp = AuxDataGetData( k, "temperature" ) ]o}g~Xn emiss = AuxDataGetData( k, "emissivity" ) :&*Y
Io If ( temp <> 0 And emiss <> 0 ) Then /SDN7M]m! ProjSolidAngleByPi = GetSurfIncidentPower( k ) J^t-p U frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) \@IEqm6 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi -3-*T) End If 39
D!e& )IN!CmpN End If D c5tRO iveJh2!#< Next k 2>%|PQ z4GcS/3K Next j KVQ^-^ kn2s,%\`<p Next i ) -yJKmV EnableTextPrinting( True ) @\{L%y%a0 Da.eVU; 'write out file fC6zDTis8A fullfilepath = CurDir() & "\" & fname QH~;B[-> Open fullfilepath For Output As #1 S$O+p&!X Print #1, "GRID " & nx & " " & ny tOUpK20q.@ Print #1, "1e+308" QH z3 Print #1, pixelx & " " & pixely %H)^k${ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 IXjFK `^3 N|76Y maxRow = nx - 1 r7dwj maxCol = ny - 1 QT\||0V~p For rowNum = 0 To maxRow ' begin loop over rows (constant X) clhmpu row = "" EI+RF{IKh For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) uJxT)m!/ row = row & irrad(colNum,rowNum) & " " ' append column data to row string =|}_ASbzw Next colNum ' end loop over columns I8ZBs0sfF{ }57s Print #1, row NUSb7<s,&Y EKQ\MC1 Next rowNum ' end loop over rows Ez()W,6]g Close #1 .DX (!cG*FrN Print "File written: " & fullfilepath =&%}p[
3g Print "All done!!" Ry47Fze End Sub &A/k{(.XP %XF>k) 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: "2l$}G H$D),s
gv kZb #k# 找到Tools工具,点击Open plot files in 3D chart并找到该文件 RA];hQI? azK7kM~ K_SURTys 打开后,选择二维平面图: -hd@<+;E dG8_3T}i
QQ:2987619807 *'i9
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