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    [技术]十字元件热成像分析 [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2022-01-24
    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探测器上,并显示其热成像图。 DJ_,1F  
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    成像示意图
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    首先我们建立十字元件命名为Target d rnqX-E;  
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    创建方法:  9f+|m9~2  
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    面1 : A[oLV"J6x5  
    面型:plane 4.I6%Bq$  
    材料:Air 'b:e`2fl  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box }__g\?Yf  
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    辅助数据: T]Gxf"mK  
    首先在第一行输入temperature :300K, KE1S5Mck>  
    emissivity:0.1; 6&M $S$y  
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    面2 : 7}OzTup  
    面型:plane d)1)/Emyj  
    材料:Air >!s =f  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box WMnR+?q  
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    位置坐标:绕Z轴旋转90度, f{xR s-u]  
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    辅助数据: )67_yHW  
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    首先在第一行输入temperature :300K,emissivity: 0.1; kq6S`~J^R  
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    Target 元件距离坐标原点-161mm; .F:qJ6E  
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    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 DeE-M"  
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    探测器参数设定: #/$}zl  
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    在菜单栏中选择Create/Element Primitive /plane [SgWUP*  
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    元件半径为20mm*20,mm,距离坐标原点200mm。 AN7WMX  
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    光源创建: !-b4@=f:  
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    光源类型选择为任意平面,光源半角设定为15度。 .CdaOWM7  
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    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。 ^ j;HYs_  
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    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 fI>>w)5  
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    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。 a]'sby  
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    创建分析面: 8*kZ.-T B  
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    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。 Q W#]i  
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    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。 ;ZX P*M9  
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    FRED在探测器上穿过多个像素点迭代来创建热图 8T92;.~(  
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    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。 Yh_H $uW  
    将如下的代码放置在树形文件夹 Embedded Scripts, l%\3'N]  
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    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。 o6sL~ *hQ  
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    绿色字体为说明文字, \]GO*]CaV  
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    '#Language "WWB-COM" <J-bDcp  
    'script for calculating thermal image map i$;GEM}tv  
    'edited rnp 4 november 2005 _6"vPN  
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    'declarations 3 Yf%M66t  
    Dim op As T_OPERATION T:o!H Xdj^  
    Dim trm As T_TRIMVOLUME <q hNX$t  
    Dim irrad(32,32) As Double 'make consistent with sampling 8(3'YNC  
    Dim temp As Double ]#R'hL%f  
    Dim emiss As Double qJ|ByZ.N+  
    Dim fname As String, fullfilepath As String 5x?eu n  
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    'Option Explicit & i"33.#]  
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    Sub Main `M/=_O3  
        'USER INPUTS 6} "?eW  
        nx = 31 #%z--xuJL  
        ny = 31 !O F#4N  
        numRays = 1000  hh<5?1  
        minWave = 7    'microns !t "uNlN  
        maxWave = 11   'microns -B :Z(]3#\  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 (1JZuR<?c  
        fname = "teapotimage.dat" #S2LQ5U  
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        Print "" /*p4(D_A  
        Print "THERMAL IMAGE CALCULATION" vR`-iRQ?_  
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        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 nL!h hseH  
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        Print "found detector array at node " & detnode XSt5s06TM  
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        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 A[J9v{bD  
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        Print "found differential detector area at node " & srcnode 2+" =i/8  
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        GetTrimVolume detnode, trm b7R#tT  
        detx = trm.xSemiApe |57KTiiNLI  
        dety = trm.ySemiApe vE/g{~[5  
        area = 4 * detx * dety jENarB^As  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety ;y<)RM  
        Print "sampling is " & nx & " by " & ny Hb 'fEo r  
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        'reset differential detector area dimensions to be consistent with sampling {YZ)IaqZ  
        pixelx = 2 * detx / nx }<7Dyn,  
        pixely = 2 * dety / ny @3wI(l[  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False k/AcXU%O+  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 _Ptf^+  
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        'reset the source power ju0]~,  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) /b6Y~YbgU  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" L`FsK64@  
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        'zero out irradiance array ehCc N4V(  
        For i = 0 To ny - 1 seY0"ym&e  
            For j = 0 To nx - 1 Djx9TBZ5  
                irrad(i,j) = 0.0 /eDah3%d  
            Next j JfKhYRl  
        Next i OdgfvHDgW  
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        'main loop WhE5u&`  
        EnableTextPrinting( False ) j)Kk:BFFY  
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        ypos =  dety + pixely / 2 %8`zaa  
        For i = 0 To ny - 1 ^q"p 8   
            xpos = -detx - pixelx / 2 .Y'kDuUu  
            ypos = ypos - pixely ;nLQ?eS\  
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            EnableTextPrinting( True ) #[sC H  
            Print i V'c9DoSRI\  
            EnableTextPrinting( False ) ;1S{xd*^N  
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            For j = 0 To nx - 1 x,7a xx6  
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                xpos = xpos + pixelx (n`\b47  
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                'shift source ;m`I}h<  
                LockOperationUpdates srcnode, True ]iz5VI@  
                GetOperation srcnode, 1, op (|6q N  
                op.val1 = xpos (nE$};c<b2  
                op.val2 = ypos uO^{+=;A =  
                SetOperation srcnode, 1, op jG.*tuf  
                LockOperationUpdates srcnode, False o9~qJnB/O  
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    raytrace zJ9,iJyuD  
                DeleteRays T.1z<l""  
                CreateSource srcnode <0kRky$  
                TraceExisting 'draw Y7{|EI+@  
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                'radiometry C*78ZwZ  
                For k = 0 To GetEntityCount()-1 5#d(_  
                    If IsSurface( k ) Then 9CN / v  
                        temp = AuxDataGetData( k, "temperature" ) C*gSx3OG  
                        emiss = AuxDataGetData( k, "emissivity" ) tICxAp:  
                        If ( temp <> 0 And emiss <> 0 ) Then t]@ Zd*  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) uq%RZF z(v  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) "QlCcH`g  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi "RShsJZMH  
                        End If qC 6Q5F  
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                    End If !t_,x=  
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                Next k _c(=>  
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            Next j J}YI-t  
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        Next i r2<+ =INn  
        EnableTextPrinting( True ) &U,f~KJ  
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        'write out file nQP0<_S  
        fullfilepath = CurDir() & "\" & fname Q3/q%#q>  
        Open fullfilepath For Output As #1 IB?A]oN1{  
        Print #1, "GRID " & nx & " " & ny (la   
        Print #1, "1e+308" ke4q$pD  
        Print #1, pixelx & " " & pixely PIrUls0}  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 K8+b\k4E  
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        maxRow = nx - 1 EjF}yuq[  
        maxCol = ny - 1 -w2g a1  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 8bysg9H0  
                row = "" ,AD| u_pP  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) 54;iLL  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string RXof$2CZS  
            Next colNum                     ' end loop over columns tFSdi. |G=  
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                Print #1, row ,,Db:4qfjD  
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        Next rowNum                         ' end loop over rows mvL'l)  
        Close #1 g SwG=e\  
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        Print "File written: " & fullfilepath (G"qIw   
        Print "All done!!" bOFLI#p&  
    End Sub E*I]v  
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    在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: M$?6 '  
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    找到Tools工具,点击Open plot files in 3D chart并找到该文件 Cei U2.:U  
      
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    打开后,选择二维平面图: [!q&r(-K  
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