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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: 2023-04-06
    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。 :U^!N8i"=  
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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 1pe eecE  
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    创建方法: 4F_*,_Y  
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    面1 : T KpX]H`  
    面型:plane 6=V&3|"  
    材料:Air Jt4&%b-T  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box :Ny.OA  
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    辅助数据: 5LVhq[}mP  
    首先在第一行输入temperature :300K, 25xpq^Zw  
    emissivity:0.1; WfbG }%&J  
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    面2 : F Qtlo+3  
    面型:plane j=U [V&T  
    材料:Air 9f ,$JjX[  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box F,2)Udim  
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    位置坐标:绕Z轴旋转90度, d-%!.,F#W  
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    辅助数据: Ap}^6_YXd  
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    首先在第一行输入temperature :300K,emissivity: 0.1; l{U-$}  
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    Target 元件距离坐标原点-161mm; rUC@Bf  
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    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 * b+ef  
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    探测器参数设定: N(<4nAE  
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    在菜单栏中选择Create/Element Primitive /plane Y8I*B =7  
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    元件半径为20mm*20,mm,距离坐标原点200mm。 #h'F6  
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    光源创建: C(i1Vx<-  
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    光源类型选择为任意平面,光源半角设定为15度。 -)%l{@Mr  
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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。 (<f`}, QxD  
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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 ha6jbni  
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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。 sdq8wn  
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    创建分析面: JTuU}nm+  
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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。 . IBy'  
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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。 'UGkL;  
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    FRED在探测器上穿过多个像素点迭代来创建热图 rwb7>]UI"d  
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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。 ?LU]O\p  
    将如下的代码放置在树形文件夹 Embedded Scripts, )H&rr(  
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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。 =FXO1UZ!  
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    绿色字体为说明文字,  QKW;r  
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    '#Language "WWB-COM" 0fhz7\a^_<  
    'script for calculating thermal image map d{?X:*F  
    'edited rnp 4 november 2005 H$2<N@'4z  
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    'declarations 4+fWIY1 "  
    Dim op As T_OPERATION  egur}  
    Dim trm As T_TRIMVOLUME 4\qnCf3  
    Dim irrad(32,32) As Double 'make consistent with sampling Ke0j8|  
    Dim temp As Double |tl4I2AV  
    Dim emiss As Double H+UA  
    Dim fname As String, fullfilepath As String dtHB@\1  
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    'Option Explicit kk6Af\NZ  
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    Sub Main 8 KH|:>s=  
        'USER INPUTS k+ Shhe1  
        nx = 31 &z!yY^g  
        ny = 31 L1'R6W~%dN  
        numRays = 1000 ~ ;CnwG   
        minWave = 7    'microns '6Lw<#It  
        maxWave = 11   'microns wxy. &a]  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 L\1&$|?  
        fname = "teapotimage.dat" *&7F(  
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        Print "" l42 3+vo  
        Print "THERMAL IMAGE CALCULATION" aj>6q=R  
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        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 :m~R<BQ"  
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        Print "found detector array at node " & detnode 8_yhV{  
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        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 2$G,pT1J  
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        Print "found differential detector area at node " & srcnode vwA d6Tm  
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        GetTrimVolume detnode, trm zQpF, N<b  
        detx = trm.xSemiApe L[M`LZpJo  
        dety = trm.ySemiApe 9 b?Nlk8d  
        area = 4 * detx * dety JL[xrK0  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety <#c/uIN  
        Print "sampling is " & nx & " by " & ny BO6u<cu"-  
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        'reset differential detector area dimensions to be consistent with sampling u">KE6um  
        pixelx = 2 * detx / nx ~!bA<q  
        pixely = 2 * dety / ny )zU bMzF  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False v[P $c$Xi  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 :=CRsQAn  
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        'reset the source power ^5{M@o  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Ft} h&aYP  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" gK8E|f-z  
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        'zero out irradiance array 3m2hB%SNb  
        For i = 0 To ny - 1 6S`J7[  
            For j = 0 To nx - 1 ;gE]*Y.Z.p  
                irrad(i,j) = 0.0 >)V1aLu=  
            Next j 25bLU?x5B  
        Next i 9^D5Sl$g  
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        'main loop Dht,!LVb;  
        EnableTextPrinting( False ) S.i CkX  
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        ypos =  dety + pixely / 2 Y/|wOm;|  
        For i = 0 To ny - 1 xfAnZBsVo  
            xpos = -detx - pixelx / 2 ;ty08D/  
            ypos = ypos - pixely h_xHQf&#  
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            EnableTextPrinting( True ) gGdt&9z %  
            Print i -Y?C1DbKz  
            EnableTextPrinting( False ) fWutB5?P  
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            For j = 0 To nx - 1 )p?p39>h  
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                xpos = xpos + pixelx cV|u]ce%1  
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                'shift source -D?-ctFYj^  
                LockOperationUpdates srcnode, True CVa?L"lK  
                GetOperation srcnode, 1, op OVy ZyZ#  
                op.val1 = xpos Y1=.46Ezf  
                op.val2 = ypos # Vq"Cf  
                SetOperation srcnode, 1, op dc]D 8KX  
                LockOperationUpdates srcnode, False b@p3iq:  
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    'raytrace M2{AaYgD  
                DeleteRays |_ChK6Q?v  
                CreateSource srcnode -n>JlfCd2  
                TraceExisting 'draw 0q4E^}iR  
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                'radiometry :<"b"{X"  
                For k = 0 To GetEntityCount()-1 y?r:`n  
                    If IsSurface( k ) Then <aScA`\B#  
                        temp = AuxDataGetData( k, "temperature" ) K4.GAGd  
                        emiss = AuxDataGetData( k, "emissivity" ) 5:T)hoF@  
                        If ( temp <> 0 And emiss <> 0 ) Then 7UVhyrl  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) dI$U{;t  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) >U%:Nfo3  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 2A,iY}R  
                        End If +DpiX&^h   
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                    End If !+F6Bf  
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                Next k 7?[{/`k~?  
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            Next j K]bw1K K  
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        Next i jf|5}5kSlf  
        EnableTextPrinting( True ) X6Y<pw`y  
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        'write out file *!W<yNrR  
        fullfilepath = CurDir() & "\" & fname |cBeyqr  
        Open fullfilepath For Output As #1 Z2.S:y.  
        Print #1, "GRID " & nx & " " & ny ^o|Gx  
        Print #1, "1e+308" \/ 9s<  
        Print #1, pixelx & " " & pixely v})-:  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 #&oL iz=hZ  
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        maxRow = nx - 1 c}l?x \/  
        maxCol = ny - 1 G\I DgPj`  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 5Vj t!%?r  
                row = "" kZfUwF:yN  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) 'x{E#4A  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string Wu\szI"  
            Next colNum                     ' end loop over columns |Nfi y  
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                Print #1, row FK:Tni  
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        Next rowNum                         ' end loop over rows 3r]m8Hp  
        Close #1 5|pPzEA>  
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        Print "File written: " & fullfilepath h M/:zC:  
        Print "All done!!" 1638U 1  
    End Sub AlH\IP  
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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: Px$4.b[{_Y  
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    找到Tools工具,点击Open plot files in 3D chart并找到该文件 YR\pt8(z?  
      
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    打开后,选择二维平面图: $vQ#ah/k  
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    离线谭健
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    只看该作者 1楼 发表于: 2023-04-07
    感谢分享 o(w xu)