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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。 T5(S2^)o bGPE0}b 成像示意图 'X^auyL 首先我们建立十字元件命名为Target 5*AXL.2ih YmziHns`b 创建方法: CKYg!\g(: rtV`Q[E 面1 : P {TJ$ 面型:plane
=<HDek 材料:Air ZK5nN9` 孔径:X=1.5, Y=6,Z=0.075,形状选择Box @5Xo2}o-Q \N,ox(f?gW l~c[} wv 辅助数据: N3%X>*' 首先在第一行输入temperature :300K, 'nmA!s emissivity:0.1;
@Z jT_ Dac)`/ $x0SWJ \G 面2 : g.lTNQm$u 面型:plane T] zEcx+e 材料:Air 3k Ci5C 孔径:X=1.5, Y=6,Z=0.075,形状选择Box h>-P / 5E]t4" !"rPSGK* 位置坐标:绕Z轴旋转90度, #z\ub5um dzf2`@8# Ql*zl 辅助数据: T(b9b,ov) EBj^4=b[ 首先在第一行输入temperature :300K,emissivity: 0.1; sV\_DP/l oBzl=N3< "y1Iu Target 元件距离坐标原点-161mm; j4.wd
RK wP!X)p\ oQ!M+sRmF 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 }9~^}99} IhnBp 6p9 (]|h6aI'} 探测器参数设定: 8Zv``t61 RBX<>* 在菜单栏中选择Create/Element Primitive /plane "yWw3(V2> nM,:f)z -%nD'qy,. La4S/. gFDnt N]<(cG&p 元件半径为20mm*20,mm,距离坐标原点200mm。 S@qp_! ?#xl3Z ;I 光源创建: QV;o9j e#"h@kZP 光源类型选择为任意平面,光源半角设定为15度。 ,_[x|8m $.G 7Vt 1!#85SMx 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 F3tps
jQ *@U{[J 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 +H)'(< H;H=8' Fn4v/)*H 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 j8Z, :op dC11kqqj 创建分析面: =L6#=7hcl Bo 35L:r| fgLjF,Y 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 )>volP ,:_c-d# OM*_%UF 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 )uPJ?
2S9 tne_]+ FRED在探测器上穿过多个像素点迭代来创建热图 FDHW'OP4 96=<phcwN[ FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 *$f=`sj 将如下的代码放置在树形文件夹 Embedded Scripts, z>x@o}#u\| . [|UNg .l}Ap7@ 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。 C2
N+X ( {#,<)wFV\ 绿色字体为说明文字, /{M<FVXK+| \kADh?phV '#Language "WWB-COM" d2\!tJm 'script for calculating thermal image map *~rj!N?; 'edited rnp 4 november 2005 d}
>Po%r: K$E3RB_F 'declarations m|*B0GW Dim op As T_OPERATION rhv~H"qzW Dim trm As T_TRIMVOLUME Di9RRHn&q Dim irrad(32,32) As Double 'make consistent with sampling }gp@0ri%5 Dim temp As Double c`6c)11K Dim emiss As Double [Nyt0l "z Dim fname As String, fullfilepath As String ^-o{3Q(w @gUp9ZwtH 'Option Explicit 1S{Biqi+ j"W>fC/u Sub Main x*7@b8J 'USER INPUTS 2u{~35 nx = 31 bR\7j+*& ny = 31 Hv,|XE@Y numRays = 1000 7qKz_O minWave = 7 'microns 2e48L677- maxWave = 11 'microns QcegT/vO sigma = 5.67e-14 'watts/mm^2/deg k^4 %?~'A59 fname = "teapotimage.dat" s%[F,hQRk %6K7uvTq Print "" ZOK!SBn^? Print "THERMAL IMAGE CALCULATION" ?K1B^M=8 2y[Q detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 *TOd Iq&z #w$Y1bjn Print "found detector array at node " & detnode ;(Yb9Mr)z A40DbD\^ad srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 rPxRGoR >w,L= z= Print "found differential detector area at node " & srcnode oFk2y ^>u H MOIUd GetTrimVolume detnode, trm O\}C`CiC detx = trm.xSemiApe +Y;P*U}Qg[ dety = trm.ySemiApe _3IT3mb2n area = 4 * detx * dety ,@$5,rNf Print "detector array semiaperture dimensions are " & detx & " by " & dety *v<f#hB" Print "sampling is " & nx & " by " & ny !2!~_*sGe 4jT6h9% 'reset differential detector area dimensions to be consistent with sampling kc'$4 J4Tw pixelx = 2 * detx / nx X9>fE{)! pixely = 2 * dety / ny I}$`gUXX8x SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False vHaM yA- Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 s{^98* cXweg; 'reset the source power q~{)
{t; SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) w\C1Bh! Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" <,vIN,Kl8/ 4P{|H 'zero out irradiance array )Q2Ap& For i = 0 To ny - 1 lg^'/8^f For j = 0 To nx - 1 U1`5P!ov irrad(i,j) = 0.0 >t+ ENYb Next j ]3r}>/2( Next i V 6}5^W y6 (L=$+B 'main loop KQ~y;{h?b EnableTextPrinting( False ) 4:MvC^X~z rFzNdiY ypos = dety + pixely / 2 k@xinK%O{ For i = 0 To ny - 1 c!w[)>v xpos = -detx - pixelx / 2 <H64L*,5'7 ypos = ypos - pixely 1UQ,V`y /*C!]Z>. EnableTextPrinting( True ) C T~6T&' Print i cXXZ'y>FP EnableTextPrinting( False ) G1|1Z5r j26i+Z (l5p_x For j = 0 To nx - 1 (Jp~=6&lKf FDoPW~+[ xpos = xpos + pixelx {lK2yi gUiO66#x 'shift source 4Kqo>|C LockOperationUpdates srcnode, True .Ys
e/oEo GetOperation srcnode, 1, op '}agi.z op.val1 = xpos kBP?_ O op.val2 = ypos .AN1Yt SetOperation srcnode, 1, op MqJTRBs% LockOperationUpdates srcnode, False &5
7c!) V|Bwle raytrace l|q-kRRjn DeleteRays x,nl PU CreateSource srcnode Mi]^wCF TraceExisting 'draw F .S^KK r8"2C# 'radiometry bvD}N<>3N For k = 0 To GetEntityCount()-1 `wa;@p+j8 If IsSurface( k ) Then t?hfP2&6 temp = AuxDataGetData( k, "temperature" ) coCT]< emiss = AuxDataGetData( k, "emissivity" ) _2KIe(,; If ( temp <> 0 And emiss <> 0 ) Then RvG=GJJ9 ProjSolidAngleByPi = GetSurfIncidentPower( k ) [aSuEu?mC frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 9]Jv
>_W* irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ?}`-?JB1 End If ^%!{qAp}Z *+v*VH End If ;R=n<=Axa ?j&hG|W9<z Next k tR51Pw -9vNV:c Next j B=KrJ{&! DE.].FD' Next i
G#[A'tbKk EnableTextPrinting( True ) ,h=a+ja8 cs6oD!h 'write out file 20I`F>-* fullfilepath = CurDir() & "\" & fname zS:2?VXxq Open fullfilepath For Output As #1 s AFn.W Print #1, "GRID " & nx & " " & ny Kyx9_2 Print #1, "1e+308" f2 ~Aug Print #1, pixelx & " " & pixely Cl'$*h Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 iw#~xel<ez xVB
rwkk( maxRow = nx - 1 NU=2*gM maxCol = ny - 1 #^$_/Q#C For rowNum = 0 To maxRow ' begin loop over rows (constant X) 0n:cmML)D row = "" k86TlQRh For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) HGAi2+& row = row & irrad(colNum,rowNum) & " " ' append column data to row string DpggZ|J Next colNum ' end loop over columns E5i5gE"\ fTXip)n!r Print #1, row UvGxA[~2+ 3qTr|8`s Next rowNum ' end loop over rows )l9KDObis Close #1 4Q !A w , >aa2 Print "File written: " & fullfilepath jyD~ER}J Print "All done!!" Ma! End Sub u7mPp3ZYK Dtd~}-_Q 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: UYxn?W.g dQT[pNp: HW]?%9a 找到Tools工具,点击Open plot files in 3D chart并找到该文件 Yuw:W:wY ]AQ}_dRi= id" `o 打开后,选择二维平面图: "gy&eR> N!c FUZ5]
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