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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。 [&Z3+/lR*  
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    成像示意图
    (\Iz(N["G  
    首先我们建立十字元件命名为Target ZwV`} 2{  
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    创建方法: ),<E-Ub  
    }|k_sx:  
    面1 : 0{8^)apII  
    面型:plane [BH^SvE  
    材料:Air y}fF<qih'>  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box j &#A 9!  
    #q06K2  
    c\n&Z'vK  
    辅助数据: 1;\A./FVv  
    首先在第一行输入temperature :300K, q*Hf%I"  
    emissivity:0.1; #SHmAB  
    rcC}4mNe  
    O:=%{/6&D  
    面2 : tA?cHDp4E  
    面型:plane Y4\BHFq  
    材料:Air 62R9 4  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box |NbF3 fD  
    Lv`*+;1 K  
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    位置坐标:绕Z轴旋转90度, oBA]qI  
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    辅助数据: Wz}8O]#/.  
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    首先在第一行输入temperature :300K,emissivity: 0.1; uB(16|W>S  
    Zy}Qc")Z  
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    Target 元件距离坐标原点-161mm; 23lLoyN  
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    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 a?zn>tx  
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    探测器参数设定: 2(-J9y|  
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    在菜单栏中选择Create/Element Primitive /plane y^rcUPLT  
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    元件半径为20mm*20,mm,距离坐标原点200mm。 h>'9-j6B  
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    光源创建: ;XJK*QDN  
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    光源类型选择为任意平面,光源半角设定为15度。 W+A-<Rh\  
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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。 =!axQ[)A  
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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 jV(\]g"/=  
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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。 0_}^IiG  
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    创建分析面: yIm@m[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。 [DW}z  
    /`M> 3q[  
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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。 y8Q96zi  
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    FRED在探测器上穿过多个像素点迭代来创建热图 -#=y   
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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。 x=+R0ny  
    将如下的代码放置在树形文件夹 Embedded Scripts, "2>I?  
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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。 45Z"U<I,9  
     #RE  
    绿色字体为说明文字, Z_ Gb9  
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    '#Language "WWB-COM" lpW|GFG  
    'script for calculating thermal image map 4Xna}7  
    'edited rnp 4 november 2005 kmJ {(y)w  
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    'declarations _3q%  
    Dim op As T_OPERATION KY)r kfo B  
    Dim trm As T_TRIMVOLUME DzZ)a E  
    Dim irrad(32,32) As Double 'make consistent with sampling @ljvTgZ(X  
    Dim temp As Double }yCw|B|a  
    Dim emiss As Double -IBf;"8f  
    Dim fname As String, fullfilepath As String /PP\L](  
    2b+0}u>a  
    'Option Explicit 'Ii%/ Ob!  
    ~[@Gj{6p0  
    Sub Main %5X}4k!p  
        'USER INPUTS !B=Oc!e=K  
        nx = 31 ~|j:xM(i  
        ny = 31 j@1rVOmK  
        numRays = 1000 9m2_zfO[ w  
        minWave = 7    'microns cz8%p;F:  
        maxWave = 11   'microns =AFTB<7-^  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 {HV$hU+_)Q  
        fname = "teapotimage.dat"  P]bq9!{1  
    UWdPB2x[  
        Print "" \bt+46y@]  
        Print "THERMAL IMAGE CALCULATION" ,hj5.;M  
    "K EB0U  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Cdjh/+!f  
    [OI&_WIw  
        Print "found detector array at node " & detnode -+1it  
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        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 32_{nLV$[  
    4X2XSK4  
        Print "found differential detector area at node " & srcnode s52c`+  
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        GetTrimVolume detnode, trm c65_E<5Z  
        detx = trm.xSemiApe lVywc:X  
        dety = trm.ySemiApe lFWN [`H  
        area = 4 * detx * dety ZeD""vJRY  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety @=[/bG  
        Print "sampling is " & nx & " by " & ny ?Gq'r2V  
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        'reset differential detector area dimensions to be consistent with sampling xF)AuGdp\  
        pixelx = 2 * detx / nx 0dKI+zgr  
        pixely = 2 * dety / ny ({3hX"C@Q  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False CPq{M.B  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 aq[;[$w  
    J@ x%TA  
        'reset the source power B;'Dh<J1  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 0\t k/<w2  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" QN[-XQ>Xt  
    _m!TUT8o  
        'zero out irradiance array W~GbB:-  
        For i = 0 To ny - 1 fP`g#t)4Tu  
            For j = 0 To nx - 1 a a<9%j  
                irrad(i,j) = 0.0 W4yNET%l,  
            Next j '3Ir(]Wfd  
        Next i r3o_mO?X  
    ; Xy\7tx  
        'main loop ~mc7O  
        EnableTextPrinting( False ) [GeJn\C_?  
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        ypos =  dety + pixely / 2 Hz$l)g}U  
        For i = 0 To ny - 1 !dfc1UjB  
            xpos = -detx - pixelx / 2 = GirUW D  
            ypos = ypos - pixely `fEB,0j^  
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            EnableTextPrinting( True ) @;}bBHQz{p  
            Print i :+ef|,:`/  
            EnableTextPrinting( False ) 03*` T  
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            For j = 0 To nx - 1 RQI?\?o  
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                xpos = xpos + pixelx R}F0_.  
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                'shift source $ WAFr  
                LockOperationUpdates srcnode, True .$+]N[-=  
                GetOperation srcnode, 1, op OKfJ  
                op.val1 = xpos Ec| Gom?  
                op.val2 = ypos u-Pa:wm0-  
                SetOperation srcnode, 1, op orn9;|8q  
                LockOperationUpdates srcnode, False wZVY h  
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    raytrace s z  
                DeleteRays f3e#.jan  
                CreateSource srcnode $:"r$7  
                TraceExisting 'draw U'S}7gya  
    \1'3--n  
                'radiometry hoI?,[@F  
                For k = 0 To GetEntityCount()-1 43pQFDWa  
                    If IsSurface( k ) Then Uw^`_\si  
                        temp = AuxDataGetData( k, "temperature" ) c 6sGjZdR  
                        emiss = AuxDataGetData( k, "emissivity" ) #|fa/kb~  
                        If ( temp <> 0 And emiss <> 0 ) Then |R:gu\gG  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) 0!F"s>(H  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) |ofegO}W7  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi v4!zB9d  
                        End If hK9Trrwau  
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                    End If }fnp}L  
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                Next k 6Y6DkFdvrZ  
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            Next j Pk[:+. f(  
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        Next i 'EJ8)2  
        EnableTextPrinting( True ) {4Y@ DQ-  
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        'write out file ZzLmsTtzIu  
        fullfilepath = CurDir() & "\" & fname Zh`lC1l'  
        Open fullfilepath For Output As #1 ?ix--?jl  
        Print #1, "GRID " & nx & " " & ny Qj~m;F!  
        Print #1, "1e+308" 7P O3{I  
        Print #1, pixelx & " " & pixely cVJ"^wgBt  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ')t :!#  
    cc7*O  
        maxRow = nx - 1 %se4aeOrX  
        maxCol = ny - 1 L<!}!v5ja  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) ]&\HAmOQS  
                row = "" 8 $0D-z  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) F+Rtoq|  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string X=_pQ+j`^  
            Next colNum                     ' end loop over columns j*>+^g\Q6  
    h`dtcJ0  
                Print #1, row e>~g!S}G  
    1C\OL!@L  
        Next rowNum                         ' end loop over rows Y~Y-L<`I  
        Close #1 ?>5[~rMn  
    ;NH 5 L,  
        Print "File written: " & fullfilepath Twyx(~'&R  
        Print "All done!!" l CHaRR7  
    End Sub SA&0f&07i  
    /e :V44  
    在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: A<l8CWv[  
    } r$&"wYM  
    ~4h<nc  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 bqp6cg\p  
      
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    :b)IDcW&j:  
    打开后,选择二维平面图: lP& 7U  
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