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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。 4>
k"$l/: j9gn7LS 成像示意图 RO+ jVY~H- 首先我们建立十字元件命名为Target QN47+)cVt" wcH,!;3z+ 创建方法: r1<dZtb |w5m2Z 面1 : eHHY.^| 面型:plane OfG/7pw5%B 材料:Air #($~e| 孔径:X=1.5, Y=6,Z=0.075,形状选择Box y0vJ@ %` 'Qdea$o b@ QCdi,u 辅助数据: Hlhd6be 首先在第一行输入temperature :300K, L0l'4RRm\ emissivity:0.1; w*?SGW "C0?s7Y -pmb-#`M 面2 : 5{/uHscwLa 面型:plane )]}G8A 材料:Air !3F3E8% 孔径:X=1.5, Y=6,Z=0.075,形状选择Box a\m_Q{: 6am
g*=] KH$|wv 位置坐标:绕Z轴旋转90度, W4;/;[/L K;z$~;F vtq$@#?~ b 辅助数据: O&dBLh!G |`ya+/ff+ 首先在第一行输入temperature :300K,emissivity: 0.1; pfBe24q g.Tc>?~ :)Pj()Os| Target 元件距离坐标原点-161mm; fmq''1u }!Y=SP1e l~]D|92 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 1rx,qfCq ;NOmI+t0w& .k:heN2-x 探测器参数设定: },n? ?g\emhG 在菜单栏中选择Create/Element Primitive /plane ;6eBfMhL /#WvC;B @(bg# aFaioE#h( ({ O~O5k 7fI2b,~ 元件半径为20mm*20,mm,距离坐标原点200mm。 0G31Kou NbC2N)L4 光源创建: )I#{\^ qnCjNN
光源类型选择为任意平面,光源半角设定为15度。 ~NZL~p ?3lAogB !&xci})7a 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。 zauDwV= MyZVx|7E 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。 X n8&&w" ollsB3]] ]1FLG*sB 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。 QM![tZt%; ]5K+W 创建分析面:
1fvN[ Kt](| Y[l<fbh(} 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。 qu1+.z=| Nm
!~h|3 &|j0GP& 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。 $ay!'MK0d s`ZP2"`f FRED在探测器上穿过多个像素点迭代来创建热图 C1'y6{,@ 6DU~6c=) FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 *|<T@BXn 将如下的代码放置在树形文件夹 Embedded Scripts, /vq$/ &<x.D]FA] e!PB3I 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。 %&_^I* w
>2sr^!y 绿色字体为说明文字, .XqeO@z 6I: 6+n '#Language "WWB-COM" Unv'm5/L 'script for calculating thermal image map #|4G,! 'edited rnp 4 november 2005 7O'.KoMw $[}EV(#y 'declarations
gyMHC{l/B Dim op As T_OPERATION ~Th,<w*o Dim trm As T_TRIMVOLUME pU9.#O Dim irrad(32,32) As Double 'make consistent with sampling P3`$4p? Dim temp As Double B2oKvgw Dim emiss As Double .dMdb7 Dim fname As String, fullfilepath As String {1Y@%e d&CpaOSu 'Option Explicit R)BXN~dQ xu_,0ZT]{ Sub Main ]/kpEx 'USER INPUTS p J_+n:_{ nx = 31 WPkKbF ny = 31 1cv~_jFh numRays = 1000 nj0sh"~+ minWave = 7 'microns 5wmd[YL maxWave = 11 'microns y] c1x=x sigma = 5.67e-14 'watts/mm^2/deg k^4 4xEw2F fname = "teapotimage.dat" e*qGrg (E X3a 9- Print "" .=9WY_@SZ Print "THERMAL IMAGE CALCULATION" ;:j1FOj zxx\jpBBk detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 |dqHpogh OtoM Print "found detector array at node " & detnode vjS=ZinN" ;<N:! $p srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 }rI:pp^KS Hc=QSP Print "found differential detector area at node " & srcnode *Q^z4UY @`dg:P*[ GetTrimVolume detnode, trm 7]xDMu'^&f detx = trm.xSemiApe -1Dq_!i dety = trm.ySemiApe Oo@o$\+v area = 4 * detx * dety 1Vdi5;dn Print "detector array semiaperture dimensions are " & detx & " by " & dety 8k95IJR1 Print "sampling is " & nx & " by " & ny -z~!%4 a sa4w.9O1GS 'reset differential detector area dimensions to be consistent with sampling jOVF+9M pixelx = 2 * detx / nx ~<f[7dBv pixely = 2 * dety / ny l@Vv%w9H SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False '"fJA/O Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 V-}}?c1 F IO)#O< 'reset the source power @]vY[O!&; SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) !*}UP|8 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" OIL8'xY.w &K\80wGK 'zero out irradiance array ,JE_aje7 For i = 0 To ny - 1 `,-mXxTNT For j = 0 To nx - 1 A vq+s.h irrad(i,j) = 0.0 !Fp %2gt| Next j d]]z ) Next i #dj?^n g az6& 'main loop 7bzm5w@v EnableTextPrinting( False ) NC%hsg^0/ 'ZW(Hjrd ypos = dety + pixely / 2 -3R:~z^L For i = 0 To ny - 1 dHUbaf:e)T xpos = -detx - pixelx / 2 WHY/x /$ ypos = ypos - pixely +T$Olz _ \6v@ EnableTextPrinting( True ) n?.; *: Print i );h(D!D, EnableTextPrinting( False ) <ToBVGX mkn1LzE|F din,yHu~ For j = 0 To nx - 1 >\Dy FAEF xpos = xpos + pixelx w'2FYe{wj P>C'?'Q7 'shift source g0tnt)] LockOperationUpdates srcnode, True {siOa%;* GetOperation srcnode, 1, op "Gp[.=.z? op.val1 = xpos r%?-MGc op.val2 = ypos _-TplGSO=c SetOperation srcnode, 1, op 2|,L 9 LockOperationUpdates srcnode, False ?eIb7O x,,y}_YX raytrace CaJ-oy8 DeleteRays Q v9q~l CreateSource srcnode 2'Dl$DH TraceExisting 'draw :+ ,;5 U =.PL\ 'radiometry Cg):
Q8 For k = 0 To GetEntityCount()-1 \vAjg If IsSurface( k ) Then MjMDD temp = AuxDataGetData( k, "temperature" ) = {O ~ emiss = AuxDataGetData( k, "emissivity" ) [s>3xWZ+a If ( temp <> 0 And emiss <> 0 ) Then R+M =)Z ProjSolidAngleByPi = GetSurfIncidentPower( k ) {Yj5Mj|# frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 2!^=G=H/ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi b_31 \ End If pbzFzLal `I5^zi8 End If }csA|cC 6h;(b2p{ Next k 9GD0jJEu 7Jf~Bn Next j %bDxvaftT I\.|\^ Next i tK%ie\ EnableTextPrinting( True ) %":3xj'EEI ?G,4N<]Nu 'write out file
b/'bhE= fullfilepath = CurDir() & "\" & fname {]HiT pn Open fullfilepath For Output As #1 $+*nb4 Print #1, "GRID " & nx & " " & ny o+a= Print #1, "1e+308" M~taZt4 Print #1, pixelx & " " & pixely ENTcTrTn Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 7ftn
gBv? ^PZ[;F40 maxRow = nx - 1 1B~O!']N< maxCol = ny - 1 J/je/PC For rowNum = 0 To maxRow ' begin loop over rows (constant X) x0
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o]r row = "" .k,j64
r For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ED&nrd1P row = row & irrad(colNum,rowNum) & " " ' append column data to row string b(*\4n Next colNum ' end loop over columns J2=4%#R! lMFR_g?r Print #1, row A[Mke b>07t!; Next rowNum ' end loop over rows ,{_i{WV Close #1 G^c,i5}w g&$=Y7G Print "File written: " & fullfilepath U]3!"+Y1P Print "All done!!" Unk/uk End Sub X0.H(p#s g*V.u]U!i 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: NHd@s#@ -zg*p&F ppAbG,7 找到Tools工具,点击Open plot files in 3D chart并找到该文件 h*S"]ye5 b RR N is<:}z 打开后,选择二维平面图: #1<m\z 7l 7V"?o
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