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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。 vTl7x +V `* 成像示意图 )ppIO"\ 首先我们建立十字元件命名为Target bzWWW^kNL V{{Xz: 创建方法: #]kO/Mr _/5#A+ ? 面1 : s L=}d[ 面型:plane 9 S4bg7 材料:Air T!%J x.^ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 8W2oGL6 NVX @1} MJ M< 辅助数据: Js'j}w 首先在第一行输入temperature :300K, \|YIuzlO4 emissivity:0.1; YHOo6syk M-V{( Tl!}Rw~Pg 面2 : ^1-Vd5g 面型:plane .Y5o&at6s 材料:Air fZgEJsr 孔径:X=1.5, Y=6,Z=0.075,形状选择Box >]<4t06D GWa:C\YK AF\gB2^ 位置坐标:绕Z轴旋转90度, xO{$6M3-~ 928uGo5 V0G"Z6 辅助数据: H(gETRh d#CAP9n;' 首先在第一行输入temperature :300K,emissivity: 0.1; >e^^YR^ I&9Itn p$ IKVFbTX:y Target 元件距离坐标原点-161mm; f;=<$Y>i y#{v\h
Cz dqgH"g 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 *6aIDFNl se@?:n1) ?Q~o<%U7 探测器参数设定: 0fog/c#q( a7}O.NDf 在菜单栏中选择Create/Element Primitive /plane mu{\_JX.A hf\/2Vl g`(3r dUH+7.\ R.KznJ uH |:gF^ 元件半径为20mm*20,mm,距离坐标原点200mm。 1<;VD0XX oV'G67 W 光源创建: L./{^) ^Rb*mI 光源类型选择为任意平面,光源半角设定为15度。 Om(Ir&0 qH(HcsgD ZkryoIQ%= 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 %J8uVD.2 tu' s]3RE 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 8osP$"/o v Q51-.g @^.o8+Pp 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。 ldnKV&N bTMgEY 创建分析面: TPn#cIPG 7$mB.\| eig{~3 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 ?4#UW7I l:~/%= iGN6'm` 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 ~? :>=x 8?1MnjhX10 FRED在探测器上穿过多个像素点迭代来创建热图 >P ~j@Lv "?^#+@LV FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 2(f-0or( 将如下的代码放置在树形文件夹 Embedded Scripts, I)MRAo TN/y4(j owx0J,,G 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 ar_@"+tZ
"u)e,gu 绿色字体为说明文字, O1!YHo 2U3e!V '#Language "WWB-COM" pV O{7I 'script for calculating thermal image map F!g;}_s9 'edited rnp 4 november 2005 vxS4YR b i>KgkRZL# 'declarations m'-QVZ{(M% Dim op As T_OPERATION *M.,Yoj Dim trm As T_TRIMVOLUME Za]~[F Dim irrad(32,32) As Double 'make consistent with sampling Z23T2 Dim temp As Double V\AY =u Dim emiss As Double (+SL1O P Dim fname As String, fullfilepath As String kN6jX 4K
]*bF44 'Option Explicit ]cM8TT v'm-A d+4t Sub Main OC)=KV@KE 'USER INPUTS DOOF--ua nx = 31 j`#H%2W\; ny = 31 ' g d=\gV numRays = 1000 ix"BLn]YZ minWave = 7 'microns "wCx]{Di maxWave = 11 'microns -f*5lkO sigma = 5.67e-14 'watts/mm^2/deg k^4 Pif-uhOk% fname = "teapotimage.dat" #/5eQTBD sN K^.0 Print "" CF:L#r Print "THERMAL IMAGE CALCULATION" R@#xPv4o% %K,cGgp^) detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ,~/WYw<o HL-'\wtl Print "found detector array at node " & detnode }$[@* Ta$55K0 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 wYLodMaYH jz Siw z Print "found differential detector area at node " & srcnode B6@q`Bmw. eaDR-g" GetTrimVolume detnode, trm P 5.@LN detx = trm.xSemiApe _SkiO}c8 dety = trm.ySemiApe hAsReZ? area = 4 * detx * dety N 'n0I^Y1A Print "detector array semiaperture dimensions are " & detx & " by " & dety ;GKL[tI" Print "sampling is " & nx & " by " & ny O{\%{XrW FzykC 'reset differential detector area dimensions to be consistent with sampling vz)R84 pixelx = 2 * detx / nx ?op;#/Q( pixely = 2 * dety / ny W)'*Dcd SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False &3J^z7kU Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 xel|,|*Yq +Jm vB6s 'reset the source power L2_[M' SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) _BONN6=*y Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 7w]3D |!/+T^u 'zero out irradiance array vvs2:87zvJ For i = 0 To ny - 1 $j8CF3d.6 For j = 0 To nx - 1 JLz32 %-M irrad(i,j) = 0.0 YQyI{ Next j [#YzU^^Ib Next i YQtq?&0Ct w`D$W&3> 'main loop io(!z-$ EnableTextPrinting( False ) }%AfZ2g;h uF1&m5^W ypos = dety + pixely / 2 F'F6 &a+ For i = 0 To ny - 1 `%^w-' xpos = -detx - pixelx / 2 vexF|'!}0# ypos = ypos - pixely A,xPA jE=m4_Ntn EnableTextPrinting( True ) D>;_R
HK Print i ^Bo'87!. EnableTextPrinting( False ) P{BW^kAdH X|/RV4x@Cq !@wUARQ For j = 0 To nx - 1 sCP|d`' CU*TY1% xpos = xpos + pixelx =CD.pw)B1 6 !?]
( 'shift source KhP_U{)D LockOperationUpdates srcnode, True 4[&&E7]EX GetOperation srcnode, 1, op X
y`2ux+>/ op.val1 = xpos mIp> ~ op.val2 = ypos dA E85 SetOperation srcnode, 1, op / 9,'. LockOperationUpdates srcnode, False w\UAKN60 7h0u7 N raytrace }s:3_9mE DeleteRays %IE;'aa
} CreateSource srcnode j%D{z5,nKm TraceExisting 'draw XT*/aa-1' o3eaNYa 'radiometry .{ZJywE< For k = 0 To GetEntityCount()-1 2+?W{yAEi If IsSurface( k ) Then `rK@> - temp = AuxDataGetData( k, "temperature" ) IW>~Yl? emiss = AuxDataGetData( k, "emissivity" ) r> Xk1~<! If ( temp <> 0 And emiss <> 0 ) Then {0np ProjSolidAngleByPi = GetSurfIncidentPower( k ) U;*t5l frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) =tY%`e irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ]~VuY:abH End If xpCZlOld jIwN,H1$- End If /OB) \{- Iz83T9I& Next k 8DMqjt3B ),y`Iw Next j ,fTC}>s4 <#;5)!gr{ Next i g kV`ZT9 EnableTextPrinting( True ) c0HPS9N\ x7G)^ 'write out file avM8-&h fullfilepath = CurDir() & "\" & fname 5O]ZX3z> Open fullfilepath For Output As #1 ]Hq,Pr_+ Print #1, "GRID " & nx & " " & ny :?LNP3} Print #1, "1e+308" 98| v.d Print #1, pixelx & " " & pixely _?y3&4N) Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ~3%\8,0 \kf
n,m maxRow = nx - 1 US^%pd maxCol = ny - 1 - US>]. For rowNum = 0 To maxRow ' begin loop over rows (constant X)
zY@0R`{@p row = "" f Ayh9 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) OwPHp&{ Y row = row & irrad(colNum,rowNum) & " " ' append column data to row string yB/F6/B~ Next colNum ' end loop over columns 8z7eL>) QVkji7)ZT Print #1, row w1(5,~OB b/JjA Next rowNum ' end loop over rows iPY)Ew`Im Close #1 KHx;r@{< v@ qDR|?^ Print "File written: " & fullfilepath {QmK4(k?|c Print "All done!!" nUVk;0at End Sub n%RaEL &OE-+z 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: yi Xb<g+B R]Z#VnL@qz S!x;w7j 找到Tools工具,点击Open plot files in 3D chart并找到该文件 #`U?,>2q ZREy I(_ vXwMo4F* 打开后,选择二维平面图: n@h$V\&\iM 4M|C>My
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