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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。 9Z.W R-}  
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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 FSkz[D_}  
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    创建方法: Hge0$6l  
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    面1 : {*t0WE&1t  
    面型:plane $g]'$PB  
    材料:Air Cc>+OUL  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box nY50dFA,  
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    辅助数据: DjveMs$d  
    首先在第一行输入temperature :300K, _*LgpZ-2(  
    emissivity:0.1; }ujl2uhM  
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    面2 : f,'9Bj. ~  
    面型:plane oVja$;>  
    材料:Air 8$V:+u  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box KkD&|&!Q7u  
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    位置坐标:绕Z轴旋转90度, "6 \_/l  
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    辅助数据: #/LU@+  
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    首先在第一行输入temperature :300K,emissivity: 0.1; IAzi:ct  
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    Target 元件距离坐标原点-161mm; xmNs<mz  
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    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 y';"tDFb  
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    探测器参数设定: o#9 Q   
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    在菜单栏中选择Create/Element Primitive /plane z6x`O-\  
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    元件半径为20mm*20,mm,距离坐标原点200mm。 (Qf. S{;  
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    光源创建:  *"Uf|  
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    光源类型选择为任意平面,光源半角设定为15度。 e6gLYhf&  
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    我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 UU*v5&  
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    我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线 )=pa*  
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    功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 Z ygu/M 6  
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    创建分析面: i2+_~$f  
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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。 |u]IOw&1  
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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。 0< 93i   
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    FRED在探测器上穿过多个像素点迭代来创建热图 RM;Uq >l  
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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。 \FIM'EKzu!  
    将如下的代码放置在树形文件夹 Embedded Scripts, nyetK  
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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。  aWPf3Q  
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    绿色字体为说明文字, rp+]f\] h  
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    '#Language "WWB-COM" $01csj  
    'script for calculating thermal image map et"Pb_-U  
    'edited rnp 4 november 2005  +#\7 #Y  
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    'declarations Xmi~fie  
    Dim op As T_OPERATION I{h KN V  
    Dim trm As T_TRIMVOLUME OE}FZCX F  
    Dim irrad(32,32) As Double 'make consistent with sampling g)R2V  
    Dim temp As Double 7377g'jL  
    Dim emiss As Double }LeS3\+UHl  
    Dim fname As String, fullfilepath As String 9ln=f=  
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    'Option Explicit I)yF!E &  
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    Sub Main jFJ}sX9]  
        'USER INPUTS D6H?*4f]  
        nx = 31 jJ-C\ v  
        ny = 31 T2/:C7zL  
        numRays = 1000 %<x! mE x  
        minWave = 7    'microns J8i,[,KcE  
        maxWave = 11   'microns " :vEWp+g  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 Fi67"*gE  
        fname = "teapotimage.dat" [`oVMR  
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        Print "" k@un}}0r  
        Print "THERMAL IMAGE CALCULATION" B~7!v${  
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        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 \ ZE[7Ae  
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        Print "found detector array at node " & detnode &e@)yVLL  
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        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 W.?/p~  
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        Print "found differential detector area at node " & srcnode ~bx ev/$d  
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        GetTrimVolume detnode, trm kI)}7e  
        detx = trm.xSemiApe d_M+W@{  
        dety = trm.ySemiApe `H6~<9r  
        area = 4 * detx * dety .WqqP  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety +Gt9!x}#e  
        Print "sampling is " & nx & " by " & ny ~(ke'`gJ0-  
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        'reset differential detector area dimensions to be consistent with sampling %g}d}5s  
        pixelx = 2 * detx / nx Vv}R S@4U  
        pixely = 2 * dety / ny <3x%-m+p4  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False fk5'v   
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 n jWe^  
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        'reset the source power 31a,i2Q4  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) p35=CX`T.  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" Oh*~+/u}q  
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        'zero out irradiance array .Q,"gsY  
        For i = 0 To ny - 1 |(3 y09  
            For j = 0 To nx - 1 Ig `q[o  
                irrad(i,j) = 0.0 T,pr&1]Lw  
            Next j UhDQl%&He  
        Next i '" "v7  
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        'main loop 6(bN*.  
        EnableTextPrinting( False ) mrP48#Y+l  
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        ypos =  dety + pixely / 2 kg7F8($  
        For i = 0 To ny - 1 @.eN+o9|  
            xpos = -detx - pixelx / 2 yxt"vm;  
            ypos = ypos - pixely "/Qz?1>l+  
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            EnableTextPrinting( True ) lFBpNUnzU  
            Print i Ek)drt7cy  
            EnableTextPrinting( False ) j 2ag b  
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            For j = 0 To nx - 1 MYS`@%ZV#k  
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                xpos = xpos + pixelx Tz @=N]D  
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                'shift source |UXSUP @s  
                LockOperationUpdates srcnode, True o P`l)`  
                GetOperation srcnode, 1, op X0;u7g2Yz  
                op.val1 = xpos >O-KJZ'GV  
                op.val2 = ypos NU=ru/  
                SetOperation srcnode, 1, op FCE y1^u  
                LockOperationUpdates srcnode, False fqgp{(`@>  
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    raytrace EQm{qc;  
                DeleteRays M=^d  
                CreateSource srcnode Ehx9-*]  
                TraceExisting 'draw \Bo%2O%4  
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                'radiometry |MwV4^  
                For k = 0 To GetEntityCount()-1 dQ`Tt- n  
                    If IsSurface( k ) Then pa>C}jk}6  
                        temp = AuxDataGetData( k, "temperature" ) ]fM|cN8(zM  
                        emiss = AuxDataGetData( k, "emissivity" ) Scrj%h%[  
                        If ( temp <> 0 And emiss <> 0 ) Then b84l`J  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) igxO:]?  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Ob$``31{s  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi nTy]sPn  
                        End If ,H]%4@]|o  
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                    End If =QqH`.3  
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                Next k |v!N1+v0  
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            Next j 0S{23L4C  
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        Next i  *&_*G~>D  
        EnableTextPrinting( True ) }N g P`m  
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        'write out file 7+HK_wNi  
        fullfilepath = CurDir() & "\" & fname HI8mNX3 "j  
        Open fullfilepath For Output As #1 \g}]u(zg%  
        Print #1, "GRID " & nx & " " & ny @| z _&E  
        Print #1, "1e+308" TQ"XjbhU;X  
        Print #1, pixelx & " " & pixely zd YH9d>D  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 b| L;*<KU  
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        maxRow = nx - 1 ]1 f^ SxSI  
        maxCol = ny - 1 digc7;8L  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) Ju+3}  
                row = "" $TUYxf0q  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) CNNqS^ct  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string m.<_WXH  
            Next colNum                     ' end loop over columns e;.,x 5+  
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                Print #1, row "| nXR8t.r  
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        Next rowNum                         ' end loop over rows o5Oig  
        Close #1 k(ouE|B  
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        Print "File written: " & fullfilepath P+CV4;Xz  
        Print "All done!!" lNe4e6  
    End Sub YmljHQP  
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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: B!'K20"gF  
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    找到Tools工具,点击Open plot files in 3D chart并找到该文件 >iT mILA  
      
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    打开后,选择二维平面图: $yOB-  
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