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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。 8 w-2Q g\]2?vY. 成像示意图 h/`]=kCl 首先我们建立十字元件命名为Target /SDN7M]m! ^5j+O.zgN 创建方法: M\4pTcz{ \*] l'>x1 面1 : )IN!CmpN 面型:plane Zj,1)ii 材料:Air OU2.d7 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ~<[$.8* @~t^zI1 VRe7Q0 辅助数据: (9g L 首先在第一行输入temperature :300K, 2% ],0,o emissivity:0.1; 9g%1^$R ybsQ[9_36 z$#q'+$ 面2 : GWb=X cx 面型:plane
UZJ^e$N 材料:Air $;GH
-+ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box uY 6]rt_#a u@ MUcW Vf28R,~m 位置坐标:绕Z轴旋转90度, 7 'T3Wc ['~E _z 6-"@j@l5< 辅助数据: ^,W;dM2 is?#wrV=K 首先在第一行输入temperature :300K,emissivity: 0.1; =rL%P~0wq <Wd#HKIG>l <V[Qs3uo( Target 元件距离坐标原点-161mm; S F:>dneB ,"6Bw|s r{+P2MPW 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ]iI2 m5c=h 244[a]
%&; 探测器参数设定: )P13AfK e3o?=; 在菜单栏中选择Create/Element Primitive /plane q4y P\B "2l$}G H$D),s
gv kZb #k# uU$YN- {J&[JA\ 元件半径为20mm*20,mm,距离坐标原点200mm。 -BV8,1 0H9UM*O 光源创建: T`ofj7$: r`dQ<U, 光源类型选择为任意平面,光源半角设定为15度。 k -V3l a:v5(@8 2}\/_Y6 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ;?h+8Z/{ /Z~}dWI 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 +,g3Xqs}X {>v5~G Q9G\T:^ury 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 -v@LJCK7I 0<3->uK 创建分析面: {s7
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""k}M2A mz>GbImVD~ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 o=]\Jy 5^5hhm4 m;4qs#qCg? 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 E4QLXx6Wa& aPToP.e FRED在探测器上穿过多个像素点迭代来创建热图 TCWt3\ 6 l,8ev FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 oKMr Pr[` 将如下的代码放置在树形文件夹 Embedded Scripts, 6*&$ha}X u7/]Go44 WGwIc7 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。 \{EYkk0] VbI$#;:[7 绿色字体为说明文字, [4 v1
N iSP}kM} '#Language "WWB-COM" :<P3fW 'script for calculating thermal image map 1w!O&kn 'edited rnp 4 november 2005 C~-.zQ$ $Ph#pM( 'declarations |Vo{ {) Dim op As T_OPERATION ,;@vVm'} Dim trm As T_TRIMVOLUME V(5*Dn84 Dim irrad(32,32) As Double 'make consistent with sampling -=WQed} Dim temp As Double BUs={"Pa Dim emiss As Double cj\?vX\V Dim fname As String, fullfilepath As String A\w"!tNM| O=5q<7PM. 'Option Explicit yz<$?Gblz &[z<p Sub Main 6Z l#$>P 'USER INPUTS Q?2GwN nx = 31 3GL,=q ny = 31 LC,6hpmh numRays = 1000 dK Qu minWave = 7 'microns mUNAA[0 L maxWave = 11 'microns ()Q#@?c~ sigma = 5.67e-14 'watts/mm^2/deg k^4 nB;[;dCz fname = "teapotimage.dat" $@HW|Y P84=.*> Print "" P''>wjMH0 Print "THERMAL IMAGE CALCULATION" z2lT4SAv+ &n'@L9v81 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 0j :u.x <Uy $b4h Print "found detector array at node " & detnode @u@,Edh {.])'~[U srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 $ ~%w21?& H+
7HD|GE Print "found differential detector area at node " & srcnode J9/EJ'My - -\eYVh[ GetTrimVolume detnode, trm N*f]NCSi detx = trm.xSemiApe t"Bp#
U1 dety = trm.ySemiApe _;,"!'R`f area = 4 * detx * dety d%K& Print "detector array semiaperture dimensions are " & detx & " by " & dety }` YtXD-o Print "sampling is " & nx & " by " & ny 9vP#/ -g TQtHU6 'reset differential detector area dimensions to be consistent with sampling Iqci}G%r pixelx = 2 * detx / nx Nwo*tb: pixely = 2 * dety / ny rvacCwI SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False \S_Ae; Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 p}Um+I=1 3a[ LM! 'reset the source power =$y;0]7Lwi SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Q@uWh: Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" R=3|(R+kA ~d3|zlh 'zero out irradiance array "A*;V For i = 0 To ny - 1 q|}O-A*wa For j = 0 To nx - 1 z(u,$vZ_ irrad(i,j) = 0.0 r~G amjS Next j q"5\bh1" Next i Z*b$&nM *a^wYWa 'main loop ;9Qxq] EnableTextPrinting( False ) !+z&] S3s ;Y,zlq2 ypos = dety + pixely / 2 vJ{F)0 K For i = 0 To ny - 1 jNI9 .45y xpos = -detx - pixelx / 2 DL#y_;#3_ ypos = ypos - pixely 29l bOi (-],VB
(+ EnableTextPrinting( True ) ,vo]WIQ\: Print i k8!:`jG EnableTextPrinting( False ) 53$;ZO3 +s6v!({Z uzI-1@` For j = 0 To nx - 1 AV4fN@BX VN0KK
1I xpos = xpos + pixelx @}
+k]c25 If]rg+|U 'shift source (Y*9[hm LockOperationUpdates srcnode, True v$xurj:v#i GetOperation srcnode, 1, op ]a`"O op.val1 = xpos LqXVi80 op.val2 = ypos iUFG!,+d SetOperation srcnode, 1, op Ljiw9*ZI LockOperationUpdates srcnode, False g{
;OgS3> N{}8Zh4op 'raytrace 'BUfdb8d DeleteRays Nobu=
Z CreateSource srcnode cNikLd~?A TraceExisting 'draw %QQ 2u$ As5-@l`@ 'radiometry HRJ\H-
V For k = 0 To GetEntityCount()-1 "%bU74> If IsSurface( k ) Then Dc*
H:x; temp = AuxDataGetData( k, "temperature" ) t&p I emiss = AuxDataGetData( k, "emissivity" ) l8J2Xd @ If ( temp <> 0 And emiss <> 0 ) Then c[V.j+Iy#^ ProjSolidAngleByPi = GetSurfIncidentPower( k ) h:|BQC frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) cv1PiIl irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ;at1|E* End If vRn]u57O 5wdKu,nq End If 7z$bCO L=S W9oWj7&h Next k s(ap~UCOw cL!A,+S[_ Next j ?`xm_udc ]jPP]Z:y Next i }I MV@z B EnableTextPrinting( True ) 9~$E+m( Q^=0p0 'write out file Kv:Rvo fullfilepath = CurDir() & "\" & fname >y,. `ECn Open fullfilepath For Output As #1 Y@<jvH1 Print #1, "GRID " & nx & " " & ny _>aP5g?Ep Print #1, "1e+308" Vugb;5Vl Print #1, pixelx & " " & pixely ,j9? 9Z7R Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ,jtaTG.> pr1bsrMuL maxRow = nx - 1 19-V;F@; maxCol = ny - 1 ]5K(}95&' For rowNum = 0 To maxRow ' begin loop over rows (constant X) dz>Jl},`k row = "" ZR-64G=L, For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ^ fyue~9u row = row & irrad(colNum,rowNum) & " " ' append column data to row string 34[TM 3L]. Next colNum ' end loop over columns y"ss<`Cn ?Z4%u8Krvz Print #1, row +V9xKhR;x *0eV9!y Next rowNum ' end loop over rows WRA(k Close #1 V1GkX=H}, gHkHAOe/ Print "File written: " & fullfilepath (+cZP&o Print "All done!!" _<DOA:'v End Sub m2YsE
j7 Vp0_R9oQ 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: %3|/t-US H3`.Y$z |W$|og'wC 找到Tools工具,点击Open plot files in 3D chart并找到该文件 NQ;$V:s) r{84Y!k~* C^5 V 打开后,选择二维平面图: (;^>G[ =yM%#{t&W
QQ:2987619807 s$(%?,yf2
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