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    [分享]十字元件热成像分析 [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2020-11-18
    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。 <z+b88D  
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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 1E'/!|  
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    创建方法: j^&{5s  
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    面1 : LNR~F_64Q  
    面型:plane SFdSA4D"  
    材料:Air {?zbrgQ<Z  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box X|3l*FL  
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    辅助数据: Q[U_ 0O,A9  
    首先在第一行输入temperature :300K, ['l.]k-b}  
    emissivity:0.1; Edi`x5"l  
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    面2 : O{F)|<L(G  
    面型:plane {ylhh%t4hi  
    材料:Air yavoGk  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box  iNxuQ7~  
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    位置坐标:绕Z轴旋转90度, /j0zb&  
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    辅助数据: J/o$\8tiMw  
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    首先在第一行输入temperature :300K,emissivity: 0.1; 8!c#XMHV  
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    Target 元件距离坐标原点-161mm; X%>Sio  
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    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 5r$ X  
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    探测器参数设定: RXj6L~vs5_  
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    在菜单栏中选择Create/Element Primitive /plane `S{Blv  
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    元件半径为20mm*20,mm,距离坐标原点200mm。 {D(_"  
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    光源创建: !w[io;  
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    光源类型选择为任意平面,光源半角设定为15度。 T|c9Swu r  
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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。 P2+Z^J`Y>  
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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 ,;2x.We  
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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。 "^~>aVuXf  
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    创建分析面: ET&Q}UOE  
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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。 '~1uJ0H  
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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。 [,F5GW{x  
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    FRED在探测器上穿过多个像素点迭代来创建热图 E,#J\)'z  
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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。 ?}N@bsl08w  
    将如下的代码放置在树形文件夹 Embedded Scripts, +N9(o+UrU  
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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。 #NAlje(7  
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    绿色字体为说明文字, "))G|+tz  
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    '#Language "WWB-COM" ?\QEK  
    'script for calculating thermal image map }<EA)se"  
    'edited rnp 4 november 2005 0.^9)v*i  
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    'declarations 2EeWcTBU}.  
    Dim op As T_OPERATION S >PTD@  
    Dim trm As T_TRIMVOLUME uM8YY[b  
    Dim irrad(32,32) As Double 'make consistent with sampling {I!sXj  
    Dim temp As Double WH.5vrY Z  
    Dim emiss As Double .Q pqbp 8  
    Dim fname As String, fullfilepath As String 0YsC@r47wL  
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    'Option Explicit HS|X//]  
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    Sub Main yK +&1U2`  
        'USER INPUTS 4MVa[ 0Y  
        nx = 31 y7 I')}SC  
        ny = 31 #-9;Hn4x  
        numRays = 1000 wn'_;0fg  
        minWave = 7    'microns {YCquoF  
        maxWave = 11   'microns d1c_F~h<  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 y[*Bw)F\N  
        fname = "teapotimage.dat" -ISI!EU$  
    %bnDxCj"  
        Print "" nj*B-M\p  
        Print "THERMAL IMAGE CALCULATION" eCY gi7?  
    #'Q_eBX  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 {*8'bNJ  
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        Print "found detector array at node " & detnode P`'Nv  
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        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 Z2Bl$ \  
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        Print "found differential detector area at node " & srcnode JLsy|}>  
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        GetTrimVolume detnode, trm 54kd>)|"ag  
        detx = trm.xSemiApe {89F*  
        dety = trm.ySemiApe eUYd0L!  
        area = 4 * detx * dety %3ecV$  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety C3af>L@}  
        Print "sampling is " & nx & " by " & ny 1"r6qYN!>  
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        'reset differential detector area dimensions to be consistent with sampling ~y+QL{P4~  
        pixelx = 2 * detx / nx o$4n D#P3  
        pixely = 2 * dety / ny n&x#_B-  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ,TTt<&c  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 NTk"W!<Cl2  
    n&=3Knbd@d  
        'reset the source power L$7 NT}L  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) [-cYFdt"V  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" d%Zt]1$  
    #/  1  
        'zero out irradiance array 3 tMFJ ;*`  
        For i = 0 To ny - 1 F/[vg  
            For j = 0 To nx - 1 7p&%0'BO1z  
                irrad(i,j) = 0.0 }O<u  
            Next j />(e.)f  
        Next i m!s/L,iJJ  
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        'main loop rrei6$H&  
        EnableTextPrinting( False ) ir<HC 'D[  
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        ypos =  dety + pixely / 2 _f%Wk>A4  
        For i = 0 To ny - 1 N5 SK_+  
            xpos = -detx - pixelx / 2 v V:eU-a  
            ypos = ypos - pixely S(jbPQT  
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            EnableTextPrinting( True ) w{3 B  
            Print i IiV:bHUE}0  
            EnableTextPrinting( False ) PuAcsYQhN  
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            For j = 0 To nx - 1 DG&14c>g  
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                xpos = xpos + pixelx ~p{.4n2:  
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                'shift source pC0l}hnUg  
                LockOperationUpdates srcnode, True dI<s)!  
                GetOperation srcnode, 1, op yzt6   
                op.val1 = xpos \w{x- }  
                op.val2 = ypos WR=e$ ;  
                SetOperation srcnode, 1, op K'~wlO@O  
                LockOperationUpdates srcnode, False A/Kw"l>  
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                'raytrace 3!^5a %u  
                DeleteRays ]%m0PU#  
                CreateSource srcnode I~EQuQ>=  
                TraceExisting 'draw LbDhPG`u  
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                'radiometry Tm@d;O'E1  
                For k = 0 To GetEntityCount()-1 >(Jy=m?  
                    If IsSurface( k ) Then ,2vPmff  
                        temp = AuxDataGetData( k, "temperature" ) >}h/$bU  
                        emiss = AuxDataGetData( k, "emissivity" ) `6`NuZ*6g  
                        If ( temp <> 0 And emiss <> 0 ) Then VZ{aET!  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) 09`5<9/  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) a9qB8/Gg[  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi t0p^0   
                        End If LX[J6YKR  
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                    End If Fku9hB  
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                Next k ma>{((N  
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            Next j r Ip84}  
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        Next i *xXa4HB  
        EnableTextPrinting( True ) 0\O*\w?  
    Oz!#);v  
        'write out file w}^z1n  
        fullfilepath = CurDir() & "\" & fname a(s}Ec${Z  
        Open fullfilepath For Output As #1 {`BC$V  
        Print #1, "GRID " & nx & " " & ny qYc]Y9fi  
        Print #1, "1e+308" di}YHMTx  
        Print #1, pixelx & " " & pixely Udv5Y  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 FW(y#Fmqs  
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        maxRow = nx - 1 /rN%y  
        maxCol = ny - 1 C,+6g/{  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 4(Gs$QkSo|  
                row = "" 'F^nW_ryW  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) S',i  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string Es6b~ #  
            Next colNum                     ' end loop over columns \](IBI:  
    _@jBz"aq\  
                Print #1, row y-O# +{7  
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        Next rowNum                         ' end loop over rows Px5ArSS  
        Close #1 +ia  F$  
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        Print "File written: " & fullfilepath >K**SjVG  
        Print "All done!!" [4sI<aH  
    End Sub |BhfW O8p  
    ja*k\w{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: 3Vjuk7  
    EL $"MT}p  
    2f ]CnD0$  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 Y%:FawR  
      
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    打开后,选择二维平面图: q/~U[.C  
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    QQ:2987619807
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