| infotek |
2023-04-06 08:38 |
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。 N_Kdi%q Vxu V`Plf
成像示意图 -esQyLx 首先我们建立十字元件命名为Target =I@I aB?usVoS 创建方法: j<k6z D W^Zuu/) 面1 : X6 N&:< 面型:plane
>]~|Nf/i 材料:Air ^$sqU 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 2#r4dr0 ,isjiy
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T ~(Sc'8 辅助数据: \"Y,1in# 首先在第一行输入temperature :300K, Bc[~'gn emissivity:0.1; o:fe`#t u3GBAjPsIk PMV,*`"9"A 面2 : \C h01LR" 面型:plane f'H|K+bO 材料:Air n|LpM . 孔径:X=1.5, Y=6,Z=0.075,形状选择Box %yu =,J j F=
%A9b_a BP0:<vK{ 位置坐标:绕Z轴旋转90度, b*M?\ aA O#^H.B
>m.. 辅助数据: "\KBF 8/BMFRJ 首先在第一行输入temperature :300K,emissivity: 0.1; Zd-6_,r . R/y`:1:W -!:5jfT" Target 元件距离坐标原点-161mm; ne/JC( 5<R m{
rxH]'6kP 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 dK4rrO >MYDwH Np/\}J&IF 探测器参数设定: <.B+&3') 7K:V<vX5 在菜单栏中选择Create/Element Primitive /plane hW<v5!, Zrr)<'!i
]p3f54! X["xC3 i !NkCki"W gtZmBe= 元件半径为20mm*20,mm,距离坐标原点200mm。 |#kY_d)10 b' y*\9Ru 光源创建: f,KB BBbG voRry6Q; 光源类型选择为任意平面,光源半角设定为15度。 g}xL7bTlI> UI+6\ 3 <78|~SKAV 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 "4)N]Nj @we1#Vz. 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 <ak[`] czuIs|_K* [ 49Cvde^ 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 ExS5RV@v' 8b)WOr6n 创建分析面: v{VF>qEP ~\jP+[>M' !i^"3!.l,] 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 *;Mi/^pzK =GPXuo
Og/aTR<;= 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 'z(Y9%+a 3SP";3+ FRED在探测器上穿过多个像素点迭代来创建热图 O -1O@:}c FklR!*oL,) FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 l<f9$l^U 将如下的代码放置在树形文件夹 Embedded Scripts, Q'/sP 5Pj iZ-R%- }B
5@w6pda 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。 1
:p' nn_O"fZi 绿色字体为说明文字, hul,Yd) Z wtY)(ka '#Language "WWB-COM" :o>=^N 'script for calculating thermal image map $nO~A7 'edited rnp 4 november 2005 qk2E> g
X!>ef 'declarations i6'=]f'{ Dim op As T_OPERATION <l{oE?N Dim trm As T_TRIMVOLUME uL`#@nI Dim irrad(32,32) As Double 'make consistent with sampling ny5P*yWEh Dim temp As Double Rql/@j`JX Dim emiss As Double t0m;tb bg Dim fname As String, fullfilepath As String cag 5w~Px ("2X8(3z 'Option Explicit ez,.-@O &<VU}c^! Sub Main n1."Qix0 'USER INPUTS ]y_:+SHc nx = 31 HAxLYun(3w ny = 31 'x*C#mt numRays = 1000 JU?;Kq9R minWave = 7 'microns Qr$'Q7 maxWave = 11 'microns 2/&=:,"t,B sigma = 5.67e-14 'watts/mm^2/deg k^4 .xJ54Vz fname = "teapotimage.dat" IA2VesHb lYG`)#T Print "" )D+BvJ Y" Print "THERMAL IMAGE CALCULATION" nR{<xD^ Nw*<e ]uD detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 3K
&637 E>bkEm Print "found detector array at node " & detnode gk%nF 4YfM.~
6 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 |OH*c3~r &=g3J4$z Print "found differential detector area at node " & srcnode cRLw)"| a{kJ`fK GetTrimVolume detnode, trm .4zzPD$1 detx = trm.xSemiApe fDy*dp4z dety = trm.ySemiApe "ko*-FrQ area = 4 * detx * dety ip-X r|Bq Print "detector array semiaperture dimensions are " & detx & " by " & dety ^Arv6kD, Print "sampling is " & nx & " by " & ny C+NN.5No !mlfG"FE 'reset differential detector area dimensions to be consistent with sampling J@5iD pixelx = 2 * detx / nx ?Q"andf pixely = 2 * dety / ny <?.eU<+O`S SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False d{S'6*`D Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 duG!QS: (47?lw
& 'reset the source power dc)%5fV\ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 3``JrkPI Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 32ki ?\P .LDZqWr- 'zero out irradiance array pJHdY)Cz For i = 0 To ny - 1 $JY\q2 For j = 0 To nx - 1 <=.6Z*x+ irrad(i,j) = 0.0 l
U/Xi Next j #]}Ii{1?Y Next i
/a1uG]Mt xuXPVJdi 'main loop 5A0]+)5E8 EnableTextPrinting( False ) %~Yo{4mHs clvg5{^q[ ypos = dety + pixely / 2 ^Q8yb*MN For i = 0 To ny - 1 dmF=8nff xpos = -detx - pixelx / 2 +f/
I>9G ypos = ypos - pixely EH844k8
p apL$`{>US EnableTextPrinting( True ) ~0PzRS^o Print i v'hc-Q9+> EnableTextPrinting( False ) eo]nkyYDP YiZk|K_ kY]"3a For j = 0 To nx - 1 Y<T0yl? p/Ul[7A4e xpos = xpos + pixelx [Mu9"kF E)*ht;u 'shift source PysDDU}v LockOperationUpdates srcnode, True {!2K-7; GetOperation srcnode, 1, op PNm@mC_fh op.val1 = xpos ai<qK3!O op.val2 = ypos T1Py6Q,- SetOperation srcnode, 1, op (_pw\zk> LockOperationUpdates srcnode, False kK75 (x Tt: (l/1 'raytrace &PC6C<<f DeleteRays sa.H,<; CreateSource srcnode :ts3_-cr TraceExisting 'draw <+*0{8?0
'Ix@<$~i3F 'radiometry mqZK1<r For k = 0 To GetEntityCount()-1 yr%[IX]R If IsSurface( k ) Then %IO*(5f temp = AuxDataGetData( k, "temperature" ) YrL(4 Nt8 emiss = AuxDataGetData( k, "emissivity" ) fw&*;az If ( temp <> 0 And emiss <> 0 ) Then Zn9u&!T& ProjSolidAngleByPi = GetSurfIncidentPower( k ) GQ1/pys frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ]gBnzh. irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ZUS-4'"$ End If !.UE} ^TV ST{Vi';} End If ^SpQtW118 gXI-{R7Me Next k {Zc8,jm y]Nk^ga:U6 Next j r)gK5Mv JU)^b
V_ Next i uX-^9t EnableTextPrinting( True ) a#]V|1*O KJ+6Y9b1 'write out file RG'iWA,9m` fullfilepath = CurDir() & "\" & fname [!)HWgx Open fullfilepath For Output As #1 O[d#-0s Print #1, "GRID " & nx & " " & ny xN*k&!1& Print #1, "1e+308" # `^nmC/F Print #1, pixelx & " " & pixely ! ;>s .] Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 1
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/B *6yY>LW maxRow = nx - 1 Fv]6an. maxCol = ny - 1 {@2+oOuYfN For rowNum = 0 To maxRow ' begin loop over rows (constant X) ]$ d ;P row = "" 'xta/@Sq For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) {}s/p9F4 row = row & irrad(colNum,rowNum) & " " ' append column data to row string tMw65Xei6b Next colNum ' end loop over columns 93*d:W8Vr *+rfRH]a Print #1, row E_~e/y"- bD{tsxm[9 Next rowNum ' end loop over rows s4|tWfZ Close #1 g7! LX[ w1I07 ( Print "File written: " & fullfilepath f"Iui Print "All done!!" ^`!+7! End Sub ZbC$Fk,,I& ;j9%D`u< 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: ]$drBk86bh I/w;4!+) ,f^fr&6jb 找到Tools工具,点击Open plot files in 3D chart并找到该文件 A8tJ&O
rwY ,marNG ,<
g%}P/ 打开后,选择二维平面图: [y8(v ~H x1Gx9z9
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