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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。 'yd<<BM` `./$hh 成像示意图 9aky+ 首先我们建立十字元件命名为Target qOAK`{b 5]D"y Ay81 创建方法: .G8+D%%. ?.Z4GWyXa 面1 : N=R|s$,Oy9 面型:plane ,$BbJQ5 材料:Air n\Y{?x 孔径:X=1.5, Y=6,Z=0.075,形状选择Box YBb%D -8H0f-1 \@8j&],dl 辅助数据: s @\UZC 首先在第一行输入temperature :300K, "l0z?u emissivity:0.1; EF1aw2 (|H1zO K'z|a{ru.{ 面2 : /sVy"48- 面型:plane iv@ey-,< 材料:Air _
T ;+* 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Q v=F' ], Xva`" }Jfi"L 位置坐标:绕Z轴旋转90度, yv1Z*wTpO ^PHWUb+`` nHiE$Y 辅助数据: t<~$?tuZ Fv_rDTo 首先在第一行输入temperature :300K,emissivity: 0.1; X633.]+ t*X
k'(v 7S+_eL^ Target 元件距离坐标原点-161mm; B"sQ\gb%Q Y v22,|: }s i{ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 .KH3.v/c| E2J.t`H HjG!pO{ 探测器参数设定: i%RN0UO^ gG5@ KD6k 在菜单栏中选择Create/Element Primitive /plane 8&T6 L O)&|9xw 8)n799<. Z:51Q .C$4jR.KC PU|
X+V> 元件半径为20mm*20,mm,距离坐标原点200mm。 cO}`PD$i Qy!*U%tG' 光源创建: ="X2AuK%1$ Hqsj5j2i 光源类型选择为任意平面,光源半角设定为15度。 ibe#Y =/_tQR~ w, uyN 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。 6KT]3*B g~,"C8-H 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。 9UF^h{X 0A$x'pU) Ih_2")d 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 UvwO/A\Gv p%MH**A 创建分析面: zT_ OB-gH3: CVo2?ZQ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 (- ]A1WQ? c& &^Do P'wn$WE[n\ 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。 btb$C /da5" FRED在探测器上穿过多个像素点迭代来创建热图 <K6:" {[Bo"a>% FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 }r%Si 将如下的代码放置在树形文件夹 Embedded Scripts, A}./ ;[ AHa%?wb ~96fyk| 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 ey icMy`7{ /HlLfW 绿色字体为说明文字, ,\t:R1.
RXo!K iQO '#Language "WWB-COM" <m") 2dJ 'script for calculating thermal image map Io8h 8N- 'edited rnp 4 november 2005 4$HU=]b6Tf m6'VMW 'declarations rUg<(/c Dim op As T_OPERATION /Mac:;W` Dim trm As T_TRIMVOLUME >%x N?% Dim irrad(32,32) As Double 'make consistent with sampling pi/Jto25z Dim temp As Double -o\o{?t, Dim emiss As Double CJn{tP Dim fname As String, fullfilepath As String c,wYXnJ_t :K-05$K 'Option Explicit ihv=y\Jt rGNYu\\ Sub Main "'#18&N 'USER INPUTS !&8nwOG nx = 31 m{dXN= ny = 31 Ib8*rL0p<L numRays = 1000 A>C&`A=- minWave = 7 'microns H>zX8qP+ maxWave = 11 'microns 8mrB_B5 sigma = 5.67e-14 'watts/mm^2/deg k^4 )sONfn fname = "teapotimage.dat" :>y?B!= SVJL|S 3k Print "" ^`BiA'gPPC Print "THERMAL IMAGE CALCULATION" @y"/hh_? 5uo?KSX% detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 O~wZU Zf [2WJ];FJ Print "found detector array at node " & detnode NU]+ {7 #o>~@.S#:0 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 [9hslk D90.z"N\i9 Print "found differential detector area at node " & srcnode c >8IM D@O#P^? GetTrimVolume detnode, trm D7X8yv1 detx = trm.xSemiApe s *8)|N dety = trm.ySemiApe "UNWbsn6Qr area = 4 * detx * dety <`PW4zSI Print "detector array semiaperture dimensions are " & detx & " by " & dety u!]g^r Print "sampling is " & nx & " by " & ny eNQQ`ll@m ~!t# M2Sk 'reset differential detector area dimensions to be consistent with sampling E4CyW pixelx = 2 * detx / nx )U2cS\k'7n pixely = 2 * dety / ny 4V6^@ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ApT8;F B Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 @k|V4 d ynq)lf 'reset the source power >e'Hz (~'/ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) y Tb OBl Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" NZ|(#` X t)p . $ 'zero out irradiance array o(gEyK For i = 0 To ny - 1 /s/\5-U7q For j = 0 To nx - 1 goMv8d irrad(i,j) = 0.0 ,
z-#B] Next j (yr<B_Y'MY Next i \dx$G?R dE_d.[! 'main loop aSGZF w EnableTextPrinting( False ) VZhHO
d QEC4!$L^ ypos = dety + pixely / 2 6r]l8*34; For i = 0 To ny - 1 r;7&U<j~Z xpos = -detx - pixelx / 2 [ Q@rW5,- ypos = ypos - pixely +46m~" ] 2F
z;TNS EnableTextPrinting( True ) lihV! 1 Print i @L-] %C EnableTextPrinting( False ) f[XsnN2 c}-WK*v *LZB.84 For j = 0 To nx - 1 Dt ~3Qd0 B-.QGf8K. xpos = xpos + pixelx m4m,-}KNi b}-/~l-: 'shift source > &V Y LockOperationUpdates srcnode, True SK]"JSY` GetOperation srcnode, 1, op p]]*H2UD op.val1 = xpos lQ{o[axT op.val2 = ypos 1y{@fg~.. SetOperation srcnode, 1, op \*
/R6svz LockOperationUpdates srcnode, False tK0Ksnl^ o9JZ-biH raytrace 6?(Z f DeleteRays Z/*X)mBuB CreateSource srcnode U4.-{. TraceExisting 'draw 8o7%qWX HX`>"
?{ 'radiometry >hFg,5 _l3 For k = 0 To GetEntityCount()-1 hgU#2`fS If IsSurface( k ) Then g,O3\jjQ temp = AuxDataGetData( k, "temperature" ) C4h4W3w emiss = AuxDataGetData( k, "emissivity" ) Y@#rGV> If ( temp <> 0 And emiss <> 0 ) Then |'SgGg=E ProjSolidAngleByPi = GetSurfIncidentPower( k ) {0IC2jE frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) M~O$,dof irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi @&F\ M} End If },& =r= B TNj WZ End If qJZ:\u8oO ixjhZk i< Next k hlO,mU \)/dFo\l Next j :dML+R#Ymh h4,S/n Next i 7.!`c-8
u EnableTextPrinting( True ) rv26vnJy" 9`|
^cL*6 'write out file 8)m fullfilepath = CurDir() & "\" & fname rl0|)j Open fullfilepath For Output As #1 =JM !`[ Print #1, "GRID " & nx & " " & ny :OC(93d)0 Print #1, "1e+308" IS[&V&.n Print #1, pixelx & " " & pixely VYAz0H1-_ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 [}1+=Ub =AVr<kP maxRow = nx - 1 ,Srj38p maxCol = ny - 1 JZom#A.
dt For rowNum = 0 To maxRow ' begin loop over rows (constant X) f{j.jfl\x row = "" ?]Wg{\NC6 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) bKb}VP row = row & irrad(colNum,rowNum) & " " ' append column data to row string .KX LWH Next colNum ' end loop over columns IuOY.c2.u T0F!0O ` Print #1, row {T(z@0Xu >ZjGs8& Next rowNum ' end loop over rows QBwgI>zfS" Close #1 a?gziCmS?C TD"w@jBA Print "File written: " & fullfilepath \66j4?H# Print "All done!!" nLjc.Z\Bl End Sub )m4O7'2G p(`?y:.3 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: o0`|r+E\ Tu9[byfrI MET"s.v 找到Tools工具,点击Open plot files in 3D chart并找到该文件 'du{ky etD8S KD Vv<Tjr 打开后,选择二维平面图: \Bg?QhA_D 7O^'?L<C'
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