| infotek |
2020-11-18 10:58 |
十字元件热成像分析
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。 W0l,cOOZJ $Hj.{;eC/k
成像示意图 w,h`s.AN 首先我们建立十字元件命名为Target Cq'KoN%nQ cFeXpj?GV
创建方法: 8>0e*jC DpUbzr41+k 面1 : -?mfE+kt 面型:plane ?)u@Rf9> 材料:Air Ed_N[I
孔径:X=1.5, Y=6,Z=0.075,形状选择Box )rekY; @>p<3_Y1
C}_ ojcR 辅助数据: kP-3"ACG 首先在第一行输入temperature :300K, MOn emissivity:0.1; a>GyO&+Dkg P/Q!<I P*I}yPeb 面2 : Cn "s`
q 面型:plane 4scNSeW 材料:Air JwAYG5W 孔径:X=1.5, Y=6,Z=0.075,形状选择Box BFo5\l:q8 V+VkY3 wM2*# 位置坐标:绕Z轴旋转90度, P@9t;dZN dvt9u9Vg=
,M^ P! 辅助数据: X{\F;Cb* iZM+JqfU|D 首先在第一行输入temperature :300K,emissivity: 0.1; 5 N#3a0) hM{{\yZS 80Gn%1A9 Target 元件距离坐标原点-161mm; R,pX:H+ no<
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>_|O1H./4 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 >D(R YI DV<` K$ET ,u`B<heoLU 探测器参数设定: Mf&{7% z7Q?D^miy 在菜单栏中选择Create/Element Primitive /plane MLRK74D
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(gr 元件半径为20mm*20,mm,距离坐标原点200mm。 =8; {\ o1FF"tLkN 光源创建: ?kB2iU_f+ \E%'Y 光源类型选择为任意平面,光源半角设定为15度。 wnM9('\ DDPxmuNG ]3KhgK%c8 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。 ~%SH3$ eS<lwA_ 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。 9hOJvQ2U] E}40oID .pN`;*7` 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。 n~A%q,DmF Axe8n1*y 创建分析面: \H=&`? bpKZ3}U nij!1z|M 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。 `<\1[HJ\ m6',SY9T
1DvR[Lx% 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。 2Fq<*pxAY
Gcig*5 FRED在探测器上穿过多个像素点迭代来创建热图 59O?_F9 ,0hA'cp 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。 0IfKJ*]M 将如下的代码放置在树形文件夹 Embedded Scripts,
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K)\M5id] 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。 IGtl\b= \>7^f
3m 绿色字体为说明文字, WnGGo'Z +TQ47Zc '#Language "WWB-COM" [L:o`j 'script for calculating thermal image map wYQ&C{D% 'edited rnp 4 november 2005 p TeOW9 Kwg4sr5"D 'declarations m<0&~rg Dim op As T_OPERATION FvJd8kV Dim trm As T_TRIMVOLUME ,B0_MDA + Dim irrad(32,32) As Double 'make consistent with sampling OujCb^Rm Dim temp As Double ho0@ l Dim emiss As Double D,g1<:< Dim fname As String, fullfilepath As String OnK~3j #@"<:!?z 'Option Explicit /yZQ\ {= JXu$ew>q Sub Main Xt#4/>dlR 'USER INPUTS F$hYKT2| nx = 31 yb/%?DNQT ny = 31 5JLu2P numRays = 1000 $`-4Ax4% minWave = 7 'microns I;Bjfv5 maxWave = 11 'microns @)-$kk* sigma = 5.67e-14 'watts/mm^2/deg k^4 -tyK~aasQ fname = "teapotimage.dat" cdG|m[ m
q{]; Print "" $pFo Rv Print "THERMAL IMAGE CALCULATION" 7g(F#T?;' ODC8D>ZYl detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 tc!wLnhG FN%m0"/Z{t Print "found detector array at node " & detnode Ie4 hhW [fKUyIY_ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 !Z5[QNVaV W"k8KODOY Print "found differential detector area at node " & srcnode e&qh9mlE ,i,q!M{- GetTrimVolume detnode, trm Tp9-niW detx = trm.xSemiApe i![dPM dety = trm.ySemiApe EB_NK area = 4 * detx * dety qq1 - DG Print "detector array semiaperture dimensions are " & detx & " by " & dety y:h}z). Print "sampling is " & nx & " by " & ny vJU*>U, 0#YX=vjX7 'reset differential detector area dimensions to be consistent with sampling `p7&>
BOA pixelx = 2 * detx / nx p$x{yz3 pixely = 2 * dety / ny GKFq+]W SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False kr9gK~ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 =T7A]U] ^=^z1M2P 'reset the source power ,57`D' SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) o, !T2&} Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" )"m!YuS Y DVkB$2] 'zero out irradiance array {M?vBgR\B For i = 0 To ny - 1 q=DN
{a: For j = 0 To nx - 1 pOrWg@<\L irrad(i,j) = 0.0 Cc, `}SP Next j /g$G_} Next i ^+1#[E S>0nx ^P 'main loop &%_& 8DkG EnableTextPrinting( False ) N?m0USu* RJON90,J ypos = dety + pixely / 2 <6G11-K For i = 0 To ny - 1 wprX!)w<i xpos = -detx - pixelx / 2 !xKJE:4/,m ypos = ypos - pixely ~(@ E`s&{ H-xFiF EnableTextPrinting( True ) >Z;jY* Print i ZDC9oX @ EnableTextPrinting( False ) %c1#lEC2xN ,~);EC=` wV)}a5+ For j = 0 To nx - 1 v*qQ? S 'vbc#_; xpos = xpos + pixelx v i)%$~ f(eQ+0D 'shift source ~6I)|^Z LockOperationUpdates srcnode, True 7 uarh! GetOperation srcnode, 1, op P@]8pIB0d^ op.val1 = xpos @y/wEBb op.val2 = ypos "sgjWo6 SetOperation srcnode, 1, op !gmH$1w LockOperationUpdates srcnode, False ,o7hk{fR* 07/L}b`P 'raytrace Ol')7d& DeleteRays p<v.Q CreateSource srcnode ~kCwJ<E TraceExisting 'draw 0liR U5]pi+r 'radiometry oiH|uIsqR For k = 0 To GetEntityCount()-1 8V-\e?&^ If IsSurface( k ) Then cFagz* ! temp = AuxDataGetData( k, "temperature" ) dk==? emiss = AuxDataGetData( k, "emissivity" ) R <"6ojn If ( temp <> 0 And emiss <> 0 ) Then bhs(Qzx ProjSolidAngleByPi = GetSurfIncidentPower( k ) k5&bq2)I frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) b`_w])Y@ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi T`9-VX;` End If Kwhdu<6 =q"eU=9 End If 3},Zlu 3[XQR8o Next k G^(}a]>9 WM)F0@" Next j &-1./? m4[g6pNx~ Next i 60Z]M+8y8 EnableTextPrinting( True ) t+nRw?Z %k0EpJE% 'write out file 6TH!vuQ1( fullfilepath = CurDir() & "\" & fname Lz\UZeq Open fullfilepath For Output As #1 )n=ARDd^e Print #1, "GRID " & nx & " " & ny XW L^ Print #1, "1e+308" U4Nh Print #1, pixelx & " " & pixely htPqT,L Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 _iEj `Vq`z]} maxRow = nx - 1 5v^L9!`@%v maxCol = ny - 1 > 4oY 3wk8 For rowNum = 0 To maxRow ' begin loop over rows (constant X) { ?{U,& row = "" nVD Xj For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) n$2 RCQ row = row & irrad(colNum,rowNum) & " " ' append column data to row string {[(pWd%J Next colNum ' end loop over columns Qeb}!k2A !CjqL~ Print #1, row wE).> yW.COWL=) Next rowNum ' end loop over rows 5A&y]5-Q` Close #1 %q_Miu@ Ewo*yY> Print "File written: " & fullfilepath 8G ]w,eF Print "All done!!" nEy]` End Sub B(l-}|m_ 2:$ 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: s%;<O:x8o Poa?Ej Y(GN4@`S 找到Tools工具,点击Open plot files in 3D chart并找到该文件 g$j6n{Yl 'Zk<l#"} |)@N-f:E 打开后,选择二维平面图: i=v]:TOu jnoL2JR[=-
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