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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。 v!T%xUb0 3'6%P_S 成像示意图 {,tEe'H7 首先我们建立十字元件命名为Target D)XF@z; *{8Kb>D 创建方法: QWv+Ja bB'iK4 面1 : @FKNB.> 面型:plane %geiJ z 材料:Air ";yCo0* 孔径:X=1.5, Y=6,Z=0.075,形状选择Box "tB"C6b ULqnr@/FbK
@dQIl# 辅助数据: * F%Wf 首先在第一行输入temperature :300K, N"/jn_>+j emissivity:0.1; 7A?~a_Ep ^AtAfVJN0 pb1/HhRR^n 面2 : " m<]B 面型:plane %Kx:'m%U 材料:Air | ?3\xw 孔径:X=1.5, Y=6,Z=0.075,形状选择Box xtYX}u E&P'@'Yk 5mUHk]W 位置坐标:绕Z轴旋转90度, ik)T>rYg0 H=[eO .)o<'u@Ri 辅助数据: FjqoO. #L5H-6nz 首先在第一行输入temperature :300K,emissivity: 0.1; x zu)``? .'JO7of ms8de>A|H Target 元件距离坐标原点-161mm; yEyx.Mh.Af Ahk6{uz T%Xl(.Ft 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 }.ZX.qYX #qY`xH'> UXwnE@`F 探测器参数设定: hAtf) 9HrT>{@ 在菜单栏中选择Create/Element Primitive /plane FIhq>L.q4 HpY-7QTPJ~ S[(Tpk2_ U;u@\E@2 UZ7Zzc#g Jt5\ 元件半径为20mm*20,mm,距离坐标原点200mm。 @dei}!e m/uBM6SXx 光源创建: NovF?kh2 ,Bax0p 光源类型选择为任意平面,光源半角设定为15度。 =aZgq99 Uo?g@D _ K["qm{X_ 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<41H;m vFm8 T58 7 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。 ,Z*&QR Hc^q_{}" !m8MyZ}% 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。 OP0KK^# RQhS]y@e 创建分析面: ;Gixu9u' jez=q TLbnG$VQS 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 :bt;DJ@ MJ "ug8N 6Hoc F/Ye 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 4.Luy f_v@.vnn. FRED在探测器上穿过多个像素点迭代来创建热图 8h"Val|qP WjLy7& FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 N?7MYP 将如下的代码放置在树形文件夹 Embedded Scripts, HZ%2WM e$kBpG"D C#<b7iMg 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。 mQ(6ahD U xVYy`_| 绿色字体为说明文字, &%eWCe++ e=uElp'% '#Language "WWB-COM" G*;?&;* 'script for calculating thermal image map xE>H:YPm 'edited rnp 4 november 2005 zv[$N, L_4c~4 'declarations xAJ
N(8? Dim op As T_OPERATION M~'4>h} Dim trm As T_TRIMVOLUME h[eC i Dim irrad(32,32) As Double 'make consistent with sampling })#VO-J Dim temp As Double u NmbR8Mx Dim emiss As Double |q|?y`X4/ Dim fname As String, fullfilepath As String ` mvPbZ0< :\hcl&W: 'Option Explicit U)CGRh8%+ Rhw- 49AWx Sub Main ?X
$#J'U; 'USER INPUTS \vg(@)$q
nx = 31 @nWhUH% ny = 31 ky4;7RK numRays = 1000 f6/<lS oW minWave = 7 'microns j8P qc] maxWave = 11 'microns ~l {*XM sigma = 5.67e-14 'watts/mm^2/deg k^4 8M6
Xd]{% fname = "teapotimage.dat" ,s ` y {*yFTP"93 Print "" VrQgn9L Print "THERMAL IMAGE CALCULATION" |)TI&T;k h2S!< detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 qStZW^lFeY TEJn;D<1I, Print "found detector array at node " & detnode ;*{"|l qe "rl(%~Op srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 /$[9-G? 6DkFI kS Print "found differential detector area at node " & srcnode 8Cx6Me>,= @n|Mr/PAj GetTrimVolume detnode, trm 1>yh`Bp\= detx = trm.xSemiApe z:Y
Z]
dety = trm.ySemiApe wak:"B[ area = 4 * detx * dety Ppton+?( Print "detector array semiaperture dimensions are " & detx & " by " & dety I3I1<}>]Z Print "sampling is " & nx & " by " & ny gDN7ly]6M #}xw
*)3 'reset differential detector area dimensions to be consistent with sampling o:wI{?%-3 pixelx = 2 * detx / nx V><,.p8 pixely = 2 * dety / ny a^vTBJXo SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False %[cZ,F= Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 UWXl
c T0;8koj^_ 'reset the source power PEr &|H2 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ~:krJ[= Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" g)Tr# G-6k[-@-v 'zero out irradiance array !-veL1r For i = 0 To ny - 1 !jQj1QZR` For j = 0 To nx - 1 OH
>#f6`[ irrad(i,j) = 0.0 5FJ(x:k?z Next j 1fH2obI~X Next i 4j1$1C{ gf ?_tB0C 'main loop @?2ES@G+Ji EnableTextPrinting( False ) u<['9U _|Uv7>}J^ ypos = dety + pixely / 2 tE8aL{<R For i = 0 To ny - 1 A.9ZFFz xpos = -detx - pixelx / 2 56?RFnZ&j ypos = ypos - pixely +$YHdgZ. BHu%x|d EnableTextPrinting( True ) ~tc,p Print i 1j*E/L EnableTextPrinting( False ) n\i~H BROn2aSx% Lcz` For j = 0 To nx - 1 4{QD: D(D OWys`2W xpos = xpos + pixelx ( 5 BZZ $L4h'(s 'shift source j.ZXLe~ LockOperationUpdates srcnode, True PX- PVW GetOperation srcnode, 1, op 4%$#
op.val1 = xpos L,O.XR op.val2 = ypos /UqIkc SetOperation srcnode, 1, op #|"M LockOperationUpdates srcnode, False `m`Y3I LO;?#e7 raytrace 2EH0d6nt DeleteRays R=J5L36F CreateSource srcnode ]7{
e~U TraceExisting 'draw n_{az{~ ._q}lWT 'radiometry =[:pm) For k = 0 To GetEntityCount()-1 R $@$ If IsSurface( k ) Then `]=0oDG:1! temp = AuxDataGetData( k, "temperature" ) G3o `\4p emiss = AuxDataGetData( k, "emissivity" ) K|Xr~\= If ( temp <> 0 And emiss <> 0 ) Then OWc~=Cr ProjSolidAngleByPi = GetSurfIncidentPower( k ) hCb2<_3CR frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) gW-mXb irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi LP'wL6# End If 050V-S>s ? _7iL? End If mndKUI}d 5]*!N Next k IuY4R0Go |s,y/svp Next j W2&(:C8V@ M0$_x~ Next i '!F'B: EnableTextPrinting( True ) 8},: zHKx,]9b 'write out file Qb5@e#
fullfilepath = CurDir() & "\" & fname N F,<^ u Open fullfilepath For Output As #1 je`Inn< Print #1, "GRID " & nx & " " & ny ^fQa whub Print #1, "1e+308" ^'n;W<\p) Print #1, pixelx & " " & pixely dJe
3DW : Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 eQwvp`@" X"sJiF S maxRow = nx - 1 J|w%n5Y maxCol = ny - 1 1ozb
tn For rowNum = 0 To maxRow ' begin loop over rows (constant X) 1H?I?IT30 row = "" M0T z('~s For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) Tol"D2cyf row = row & irrad(colNum,rowNum) & " " ' append column data to row string Q
ZC\%X8j Next colNum ' end loop over columns I+,CiJ|4 q+} \(| Print #1, row !X9^ L^v} n]6-`fpD Next rowNum ' end loop over rows 4peRbm Close #1 qLPuKIF 6OB3%R'p Print "File written: " & fullfilepath dQz#&&s-
Print "All done!!" IL1iTRH End Sub LLKYc y dvM%" 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: mL-6+pJ@ H>Ucmd;ay 6a<zZO`Z6+ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 .K]Uk/W H:P7G_!\ DJ9x?SL@KD 打开后,选择二维平面图: #q>\6} ) Ldj*{t`5
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