| 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。 ]F@XGJN #^- U|~,
成像示意图 29?{QJb 首先我们建立十字元件命名为Target NU*6MT4 `N~;X~XFk 创建方法: Ojx1IL 'm@0[i 面1 : |wKC9 O@% 面型:plane ,y[wS5li 材料:Air \e5bxc 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ta*B#2D> ,X&lVv#
9S0I<<m 辅助数据:
-<gGNj.x- 首先在第一行输入temperature :300K, v1yNVs\} emissivity:0.1; _MfB,CS
H|4O`I;~( nf5Ld"|%9 面2 : .17WF\1HC. 面型:plane .kSx>3 材料:Air ZM/*cA!" 孔径:X=1.5, Y=6,Z=0.075,形状选择Box SU.T0>w s[|sfqB1` T`f6`1x 位置坐标:绕Z轴旋转90度, zg!;g`Z@S I| qoH N,g
wRL=9/5(8 辅助数据: @Y'BqDFlZ 8[SiIuIV 首先在第一行输入temperature :300K,emissivity: 0.1; -MV </ H/>86GG 0^4uZeW? Target 元件距离坐标原点-161mm; lzz rzx^ `MAluu+b
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[ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 iN0gvjZ q;a`*gX^ bv`gjR 探测器参数设定: " d3pkY 8BC F.y 在菜单栏中选择Create/Element Primitive /plane Yxye?R-: 2]n"7Z8(v8
)A9K9pZj N\ ?%944R Ep/4o<N( 9^Q:l0| 元件半径为20mm*20,mm,距离坐标原点200mm。 5n,?>>p$ `QV}je 光源创建: [#>ji+%= <JE-#i 光源类型选择为任意平面,光源半角设定为15度。 /238pg~Cw5 TN}YRXtW+ 8;YeEW5 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。 B5>h@p-UV $E@L{5Yt 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 N!>Gg|@~ z5PFppSQ uM,bO*/f 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 &K5wCNX1 uBI?nv, 创建分析面: w*`5b!+/ k;PQVF&E 6k"'3AKaR 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 d?(#NP#; S8mqz.
|[n-H;0 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 YRF%].A%2 ^~Nz8PCY FRED在探测器上穿过多个像素点迭代来创建热图 A6Ttx{] 9E^IEwq' FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 6Clxe Lk 将如下的代码放置在树形文件夹 Embedded Scripts, %;kr%%t% 1TbY,3W
;o]'7qGb 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 L6yRN>5aE Szrr`.'] 绿色字体为说明文字, YXxaD@ 6r/NdI '#Language "WWB-COM" pOQ'k>! 'script for calculating thermal image map U.<';fKnT 'edited rnp 4 november 2005 k`Nc<nN8 WUx}+3eWv 'declarations _?&$@c Dim op As T_OPERATION 'L)@tkklp Dim trm As T_TRIMVOLUME dABmK; Dim irrad(32,32) As Double 'make consistent with sampling R'f|1mt Dim temp As Double #4"(M9kf Dim emiss As Double @O9.~6 Dim fname As String, fullfilepath As String Q{6Bhx *> P]:r'^Yn 'Option Explicit )K.~A&y@ (y%}].[bB Sub Main p@] \ N 'USER INPUTS z?`&HU Nf nx = 31 TB9{e!4 ny = 31 |r5 n p numRays = 1000 uTGd{w@]0| minWave = 7 'microns }yZ9pTB.?E maxWave = 11 'microns BYt#aqf sigma = 5.67e-14 'watts/mm^2/deg k^4 T6MlKcw,t fname = "teapotimage.dat" bI.LE/yk _cdrz)T Print "" `oP :F[B Print "THERMAL IMAGE CALCULATION" =4cK9ac ?{l}35Q.@ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 9 lE[oAC =?>f[J5 Print "found detector array at node " & detnode x>vC;E${" t98t&YUpm srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 NXsDn&&O (@*[^@ipV Print "found differential detector area at node " & srcnode [2I1W1pd %Cbqi.iuQ GetTrimVolume detnode, trm cjfYE] detx = trm.xSemiApe q eLfO dety = trm.ySemiApe Zyxr#:Qm area = 4 * detx * dety dC8$Ql^< Print "detector array semiaperture dimensions are " & detx & " by " & dety @qk$
6X Print "sampling is " & nx & " by " & ny ,.[T]37 SskvxH+7 'reset differential detector area dimensions to be consistent with sampling i356m9j pixelx = 2 * detx / nx {/`iZzPg pixely = 2 * dety / ny /NfuR$oMd SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False h`n,:Y^++P Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 m`
^o<V& KdIX` 'reset the source power !gA<9h SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) RGFanP Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ;0DTf nNJU@<|{* 'zero out irradiance array F#_JcEE For i = 0 To ny - 1 u;p.:{' For j = 0 To nx - 1 pEgQ)
9\
irrad(i,j) = 0.0 21'I-j Next j 94 58.!3 Next i g&eIfm S}6Ty2.\ 'main loop xl [3*K EnableTextPrinting( False ) ~<
%%n'xmm @9_H4V ypos = dety + pixely / 2 ssaEAm: For i = 0 To ny - 1 ZXV_Dc xpos = -detx - pixelx / 2 "SC }C ypos = ypos - pixely +(n&>75 r
>bMx~a] EnableTextPrinting( True ) FG/". dU Print i FOJ-?s( EnableTextPrinting( False ) zOJ4I^^ dsck:e5agZ 3cfJ(%'X For j = 0 To nx - 1 6.%M:j00E Tbf't^Ot$ xpos = xpos + pixelx k4:$LFw@ Fy:CG6@X 'shift source @@~OA>^ LockOperationUpdates srcnode, True N$>.V7H& GetOperation srcnode, 1, op >g7}JI& op.val1 = xpos ILi{5L op.val2 = ypos >h:rYEsh8V SetOperation srcnode, 1, op y4sKe:@2 LockOperationUpdates srcnode, False |@'/F #T oz3N
8^M 'raytrace <u "xHl8Io DeleteRays B(tLV9B3Q CreateSource srcnode x\(@v TraceExisting 'draw r7B.@+QK A^lJlr:_` 'radiometry 9C&Xs nk For k = 0 To GetEntityCount()-1 wUb5[m If IsSurface( k ) Then A|jmp~@K)+ temp = AuxDataGetData( k, "temperature" ) t&scvXh emiss = AuxDataGetData( k, "emissivity" ) s<3cvF< If ( temp <> 0 And emiss <> 0 ) Then sBUK v(U) ProjSolidAngleByPi = GetSurfIncidentPower( k ) fny|^F]w frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) pJ8;7u irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi B=dF\.&Z End If {qxFRi#\k 2gP^+. End If p;8I@~dh ])`+
78 Next k K4w %XVaH vG E;PwR Next j I*h%e,yIO ,uz+/K%OA5 Next i i'XW)n EnableTextPrinting( True ) R=Qa54 ;B Lw?kf 'write out file O*qSc^ 9q fullfilepath = CurDir() & "\" & fname m@(8-_ Open fullfilepath For Output As #1 VtM:~|v Print #1, "GRID " & nx & " " & ny jLc"1+ Print #1, "1e+308" {7EnM1] Print #1, pixelx & " " & pixely
kdmmfw Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 !+bLhW` [\i0@ maxRow = nx - 1 h>0R!Rl8 maxCol = ny - 1 qH1k For rowNum = 0 To maxRow ' begin loop over rows (constant X) K;uOtbdOK row = "" (i3V[H For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) lI,lR row = row & irrad(colNum,rowNum) & " " ' append column data to row string 3)D' Yx Next colNum ' end loop over columns o<1a]M| He&7(mQ0^ Print #1, row zY11.!2 ucP"<,a Next rowNum ' end loop over rows cx+w_D9b! Close #1 RC[mpR;2 fRcs@yZnS Print "File written: " & fullfilepath $*k(h|XfwW Print "All done!!" >JSk/]" End Sub &-5`Oln ^4G%*- 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: Wi;wu* DHI%R< d17RJW%A 找到Tools工具,点击Open plot files in 3D chart并找到该文件 O {hM f0^;*Y 9`a1xnL 打开后,选择二维平面图: HQ187IwpTm <bvbfS
QQ:2987619807 ~8oti4
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