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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。 w"&n?L 8kDp_si 成像示意图 XHGFf_kW_N 首先我们建立十字元件命名为Target R_S.tT! , SnSW-P 创建方法: "Os_vlapHo -+-_I*( 面1 : yJe>JK~) 面型:plane dN[\xVcj 材料:Air QnX(V[ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box T37XBg H Yk Qd
wJY' 辅助数据: j^2j&Ta 首先在第一行输入temperature :300K, 2gVm9gAHUd emissivity:0.1; H~z`]5CN I[X772K d9|<@A 面2 : {U !g.rh 面型:plane Tc3yS(aq 材料:Air 2Q:+_v 孔径:X=1.5, Y=6,Z=0.075,形状选择Box -!]ZMi9 l0i^uMS pIKPXqA 位置坐标:绕Z轴旋转90度, t}tEvh GF=g<H
M mBON$sF| 辅助数据: =kG@a(- )p%E%6p 首先在第一行输入temperature :300K,emissivity: 0.1; CYYU7 W-lN>]5}m YLn?.sV{[0 Target 元件距离坐标原点-161mm; {h`uV/5@` hpL;bM' 4d;8`66O 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 \=0Vi6!Mc Rr|VD@% kt$jm)UI~l 探测器参数设定: rguC p}r 'F#KM1s 在菜单栏中选择Create/Element Primitive /plane $l&(%\pp 2x0<&Xy#P XAL1|]S -4_$lnw$ WU=59gB+jL KRDmY+ 元件半径为20mm*20,mm,距离坐标原点200mm。 G{%L B}2 0F><P?5 光源创建: Bh]P{H% j]/RC(;? 光源类型选择为任意平面,光源半角设定为15度。 RF0HjgP _/5H l` Aj+F
|l 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。 d <JM36j? p|D/;Mk 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。 (mt k 4 )gy!GK Jz
*;q~ 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。 cJ
@Wt>YI w%BL 创建分析面: 161xAig K?$^@N cY. bO/&l 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。 _X"N1,0 aM0f/"-_ n3
r3"~i 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。 ?R.j^S^ E#t>Qn FRED在探测器上穿过多个像素点迭代来创建热图 2u*KM`fa` 'qX|jtdM 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。 7,9=uk>0\ 将如下的代码放置在树形文件夹 Embedded Scripts, A` o8'+`C FZE"7ec>m GD_hhDyD 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。 Jidwt$1l( !6Mo]xh 绿色字体为说明文字, +l{= 6]%sFy2 '#Language "WWB-COM" Jd^,] 'script for calculating thermal image map .O}% 'edited rnp 4 november 2005 rK]Cr9W M eHNyNVz 'declarations s'J:f$flS Dim op As T_OPERATION b9<#K+L- Dim trm As T_TRIMVOLUME Ur=(.%@ Dim irrad(32,32) As Double 'make consistent with sampling 56-dD5{hxR Dim temp As Double t+T4-1 3a Dim emiss As Double T&o(N3lW Dim fname As String, fullfilepath As String !fR3(=oN M>ruKHipFE 'Option Explicit /F'sb[ lHe{\N[C Sub Main ly_HWuFJ3 'USER INPUTS HqD^B[jS nx = 31 s6.M \^ ny = 31 OL,TFLn4 numRays = 1000 x%!s:LVX minWave = 7 'microns fbKkq.w maxWave = 11 'microns >DZw sigma = 5.67e-14 'watts/mm^2/deg k^4 3!oi +_ fname = "teapotimage.dat" NDlF0f =wOm}V8N& Print "" YhE+W Print "THERMAL IMAGE CALCULATION" ww $ `q*M4, detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 (w/T-* .ndCfdy~ Print "found detector array at node " & detnode [)zP6\I ZE=Sp=@)j srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 n+q!l&& /-+xQn] Print "found differential detector area at node " & srcnode Q&=w_Wc }Nm#q@o$P GetTrimVolume detnode, trm 4DOH`6#an detx = trm.xSemiApe DiwxXqY
dety = trm.ySemiApe KZ
;k)O.Ov area = 4 * detx * dety _ff`y Print "detector array semiaperture dimensions are " & detx & " by " & dety "(z5{z?S Print "sampling is " & nx & " by " & ny yvHA7eq*" 92x(u%~E 'reset differential detector area dimensions to be consistent with sampling D rHVG pixelx = 2 * detx / nx X"e5Y!:M- pixely = 2 * dety / ny vZ&T}H~8 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False _R13f@NWB: Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 6ZG+ZHUC& Hmd]
FC,_ 'reset the source power vV6I0 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) s!c`= Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" *@v)d[z_ 6S*exw 'zero out irradiance array IsM}'. For i = 0 To ny - 1 F{Jw^\ For j = 0 To nx - 1 +)<wDDC_ irrad(i,j) = 0.0 {/(D$"j(S Next j (ehK?6[ Next i NS%xTLow- iAa.}CI,zB 'main loop 0y;*Cfi9 EnableTextPrinting( False ) )d1_Wm#B UA8GL D9 ypos = dety + pixely / 2 ~&8^9E a For i = 0 To ny - 1 'y2nN=CN xpos = -detx - pixelx / 2 !GLz)#SBl ypos = ypos - pixely S=<}:#;u0 BJB^m|b) EnableTextPrinting( True ) ;":zkb{ Print i TYmP) EnableTextPrinting( False ) O[s{ Gk'>
1 +qw$T PMh^(j[ For j = 0 To nx - 1 9XyYHi %?uc><&?e xpos = xpos + pixelx 36%nB* KJ=6 n%6 'shift source [}/LD3 LockOperationUpdates srcnode, True !2A:"2Kys: GetOperation srcnode, 1, op ^ZhG>L* op.val1 = xpos \h D dU+ op.val2 = ypos p|jV{P SetOperation srcnode, 1, op ^G.Xc\^w: LockOperationUpdates srcnode, False Q6AC(n@:FV ^m"u3b4 raytrace 8lb%eb]U DeleteRays `m>*d!h= CreateSource srcnode c^u"I'#Q TraceExisting 'draw oA7;.:3 X M#T'S9y8 'radiometry WObvbaK For k = 0 To GetEntityCount()-1 .0iQad&duh If IsSurface( k ) Then HATA- M temp = AuxDataGetData( k, "temperature" ) \"^w'ng emiss = AuxDataGetData( k, "emissivity" ) wX[8A/JPD If ( temp <> 0 And emiss <> 0 ) Then ZF|+W?0&% ProjSolidAngleByPi = GetSurfIncidentPower( k ) ?~;:jz|9<' frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) x2z;6) irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi "D'B3; uWK End If W4e5Rb4~f" 2
:mn</z End If 5ish\" Zh*u(rO Next k !{)tSipd 8J~1-; Next j H5]^
6
HwX dBe`p5Z Next i mG`e3X6@- EnableTextPrinting( True ) $dzy%lle Yd= a}T 'write out file IS[thbzkZ fullfilepath = CurDir() & "\" & fname 7.@TK& Open fullfilepath For Output As #1 0iK;Egwm Print #1, "GRID " & nx & " " & ny =gvBz | + Print #1, "1e+308" P=&o%K,:f Print #1, pixelx & " " & pixely Q7C;1aO Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 :.d:9Z|_ !]fQ+ *X0g maxRow = nx - 1 9,_mS{+B maxCol = ny - 1 t|!j2<e For rowNum = 0 To maxRow ' begin loop over rows (constant X) 0i|oYaC row = "" }gMDXy} For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) f0<%&2ym row = row & irrad(colNum,rowNum) & " " ' append column data to row string < |