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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。 J2Mq1*Vp q }G)2HTaZ 成像示意图 kz*6%Cg*~ 首先我们建立十字元件命名为Target TE5J
@I @<jm+f"MP 创建方法: [[#R ry F%:74.]Y 面1 : I7#^'/ 面型:plane `h'7X( 材料:Air T)I\?hqTB 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Xw#"?B(M] #De a$ SajG67 辅助数据: B k*Rz4Oa 首先在第一行输入temperature :300K, ;nx.:f emissivity:0.1; 0j!xv(1 Bp_8PjQ }BUm}.-{u, 面2 : DbSR(: 面型:plane ;Nw)zS 材料:Air sU+8'&vBp 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 2 :4o`o :Xs4 C%H; AQ?;UDqU 位置坐标:绕Z轴旋转90度, m1e Sn |)7 o-o -'0l Q;s{M{u 辅助数据: X`(fJ', ?iZM.$![ 首先在第一行输入temperature :300K,emissivity: 0.1; 6V"uovN2 x_x_TEyy h [C/{ ru&E Target 元件距离坐标原点-161mm; ~.4y* & )}7X4g6X WH"'Ju5} 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 0CvGpM, sYfm]Faz 'd|!Hr<2 探测器参数设定: D~bx'Wr+ %
H<@Y$r 在菜单栏中选择Create/Element Primitive /plane )Ii`/I^ \*&?o51!e ZXN`8!]& D@O5G d ^We}i kl[(!"p 元件半径为20mm*20,mm,距离坐标原点200mm。 l =t/"M= cs7^#/3< 光源创建: -\USDi( xkRS?Q g 光源类型选择为任意平面,光源半角设定为15度。 B9Mp3[ +_k A&Q(t &Nh
zEl1 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。 A|4om=MO M7T*J>i 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。 aOw#]pB| 8#HnV%|N /CH]'u^j 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。 pY[b[ezb %t$KVV 创建分析面: /E2P ~1E!Co xY/F)JOeG 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 5Po:$( )-ojm$ UmvnVmnv 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。 d"IZt;s/, ul~6zBKO FRED在探测器上穿过多个像素点迭代来创建热图 10h;N[ !*L)v 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。 ke! 将如下的代码放置在树形文件夹 Embedded Scripts, 9-V'U\}L M 87CP=yc ,Jh#$mil 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。 `)5WA{z jl>TZ)4}V 绿色字体为说明文字, BgD3P.;[ a]7g\rg) '#Language "WWB-COM" mj ?Gc 'script for calculating thermal image map SD :D8"8 'edited rnp 4 november 2005 k7Qs#L ^"p. 3Hy 'declarations i}zz!dJTE Dim op As T_OPERATION ~c<8;,cjYR Dim trm As T_TRIMVOLUME NA/`LaJ Dim irrad(32,32) As Double 'make consistent with sampling (&Jo.
< Dim temp As Double @8>bp#x/1 Dim emiss As Double W6}>iB Dim fname As String, fullfilepath As String 1<1+nGO n42\ty9 'Option Explicit 3N-pND0>p [T,^l#S1 Sub Main |nWEuKHy 'USER INPUTS bEj}J_# nx = 31 d{Jk:@.1 ny = 31 [520!JhZY numRays = 1000 U;WwEta ] minWave = 7 'microns jd-ccnR l maxWave = 11 'microns 1P[x.t# sigma = 5.67e-14 'watts/mm^2/deg k^4 zG<<MR/< fname = "teapotimage.dat" yc~<h/}# P{UV3ZA% Print "" J<+f7L Print "THERMAL IMAGE CALCULATION" !L9OJ1F Kcp YHWCa. detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ,8Po
_[ 1s@QsZ3 Print "found detector array at node " & detnode #"KC29!Yj B7[d^Y60B srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 RG'76?z a-E}3a Print "found differential detector area at node " & srcnode hXth\e\[{` u%e~a] GetTrimVolume detnode, trm Ms,MXJtH detx = trm.xSemiApe 18sc|t dety = trm.ySemiApe eGq7+ area = 4 * detx * dety yD7} Print "detector array semiaperture dimensions are " & detx & " by " & dety YwET.(oo Print "sampling is " & nx & " by " & ny ~qeFSU( P'OvwA 'reset differential detector area dimensions to be consistent with sampling :=;{w~D pixelx = 2 * detx / nx jhf3(hx&F pixely = 2 * dety / ny !2.BLJE> SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ;j/$%lC Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 f\dfKNm6 @9KW ]7 'reset the source power rX?ZUw?u& SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) g?v(>#i Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" =n"k gn \ m~?yq8H 'zero out irradiance array 3._
ep For i = 0 To ny - 1 x+Xd7N1 For j = 0 To nx - 1 uB.kkkGZ M irrad(i,j) = 0.0 !`I@Rk]`c Next j B ??07j Next i gx9Os2Z|3 {IV%_y? 'main loop j0mN4Ny EnableTextPrinting( False ) Pn">fWRCx e9h@G# ypos = dety + pixely / 2 &}k7iaO For i = 0 To ny - 1 4G(7V: xpos = -detx - pixelx / 2 g) u%?T ypos = ypos - pixely O[ird`/ #mu L-V EnableTextPrinting( True ) :Fb>=e Print i @h{|tP%" EnableTextPrinting( False ) k(dakFaC^ hvw9i7# ~< bpdI0 For j = 0 To nx - 1 WZNq!K H Cr7Zi>sd<! xpos = xpos + pixelx !Rl|o^Vw>{ oM~y8O 'shift source Q p>b LockOperationUpdates srcnode, True wL?Up>fr GetOperation srcnode, 1, op ja_8n["z op.val1 = xpos 4$&l`yWU+ op.val2 = ypos MMFwT(l<1 SetOperation srcnode, 1, op \QK@wgu LockOperationUpdates srcnode, False LOx+?4|y 8~o']B;lJ 'raytrace &*<27-x DeleteRays ux&"TkEp CreateSource srcnode aDNB~CwZZ TraceExisting 'draw vAUt~X" ljNwt 'radiometry 0
jth}\9 For k = 0 To GetEntityCount()-1 .r<aPy$ If IsSurface( k ) Then ':wf%_Iw temp = AuxDataGetData( k, "temperature" ) |qUGB.Q emiss = AuxDataGetData( k, "emissivity" ) nTqU~'d' If ( temp <> 0 And emiss <> 0 ) Then Pq omi!1 ProjSolidAngleByPi = GetSurfIncidentPower( k ) yXR1NYg frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) MuY:(zC% irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi =#G
2}8mQD End If r.H`3m.0q yV{B,T`W End If c1'@_Is o]e,5] Next k wGArR7r |RiJ>/MK\ Next j 1VX3pkUET xPm. TPj Next i ,&t+D-s<f EnableTextPrinting( True ) EMmgX*iu@ *DF3juf~ 'write out file YP2VSK2Q fullfilepath = CurDir() & "\" & fname lYx_8x2 Open fullfilepath For Output As #1 03 @aG Print #1, "GRID " & nx & " " & ny pr0X7 #_E5 Print #1, "1e+308" A>@#eyB Print #1, pixelx & " " & pixely OM\J4"YV$ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 t}q
e_c NfgXOLthM maxRow = nx - 1 QHk\Z maxCol = ny - 1 #aP#r4$ For rowNum = 0 To maxRow ' begin loop over rows (constant X) }\"EI<$s row = "" 7*5B For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) jdxHWkQ row = row & irrad(colNum,rowNum) & " " ' append column data to row string /s\ mV Next colNum ' end loop over columns +K4XMf bwsKdh Print #1, row YJJ1N/Z1 |`T(:ZKXZ2 Next rowNum ' end loop over rows hhTtxC<: Close #1 ,MY7h8V/ U zy@\ Print "File written: " & fullfilepath /%T/@y Print "All done!!" @?,x3\N- End Sub
=z.j{% ]EiM~n 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: hg)Xr5> VdHT3r NdXHpq; 找到Tools工具,点击Open plot files in 3D chart并找到该文件 >G]JwO V"/.An| `a83RX_\ 打开后,选择二维平面图: yZleots1 hY"eGaoF"
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