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    [分享]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 正序阅读 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。 B]PTe~n^  
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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 FHNK%Ko  
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    创建方法: <1(:W[M  
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    面1 : \NYtxGV[Z  
    面型:plane 1Aq*|JSk(  
    材料:Air !P7##ho0  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box O*3x'I*a  
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    辅助数据: P)fv:a  
    首先在第一行输入temperature :300K, )oOcV%  
    emissivity:0.1; '1)BZ!  
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    面2 : {~g(WxE  
    面型:plane X\SZ Q[gN  
    材料:Air Wt +, 6Cq  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box )!1; =   
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    位置坐标:绕Z轴旋转90度, *|n::9  
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    辅助数据: dw)SF,  
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    首先在第一行输入temperature :300K,emissivity: 0.1; H'myd=*h~8  
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    Target 元件距离坐标原点-161mm; *uR&d;vg.8  
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    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ?3!"js B  
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    探测器参数设定: Nw@tlT4  
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    在菜单栏中选择Create/Element Primitive /plane 4[z a|t  
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    元件半径为20mm*20,mm,距离坐标原点200mm。 hR3lo;'  
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    光源创建: q/xMM `{  
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    光源类型选择为任意平面,光源半角设定为15度。 X>mY`$!/  
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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。 _Zya GDv  
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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 u-Pa:wm0-  
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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。 ^yH!IRRAq  
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    创建分析面: c[ ]_gUp8  
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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。 k"|4 LPv[  
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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。 Zrp`91&I  
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    FRED在探测器上穿过多个像素点迭代来创建热图 x[7jm"Pz  
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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。 9Vz1*4Ln  
    将如下的代码放置在树形文件夹 Embedded Scripts, LtKiJ.j?A  
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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。 kf+]bV  
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    绿色字体为说明文字, }^WQNdws56  
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    '#Language "WWB-COM" R0y={\*B5k  
    'script for calculating thermal image map obRR))  
    'edited rnp 4 november 2005 tLe!_p)  
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    'declarations 5Z}]d@  
    Dim op As T_OPERATION $8o(_8Q)  
    Dim trm As T_TRIMVOLUME <b>@'\w9  
    Dim irrad(32,32) As Double 'make consistent with sampling 8<M'~G%CEq  
    Dim temp As Double Rk.YnA_J6  
    Dim emiss As Double 5R}Qp<D[^  
    Dim fname As String, fullfilepath As String ')t :!#  
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    'Option Explicit ?F20\D\V  
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    Sub Main EZaWEW  
        'USER INPUTS )ALPMmlRs  
        nx = 31 `,d*>  
        ny = 31 Ql a'vcT  
        numRays = 1000 'Ca6cm3Tg  
        minWave = 7    'microns ,ii*[{X?  
        maxWave = 11   'microns Sj;B1&  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 w*<XPBi  
        fname = "teapotimage.dat" lxy_O0n  
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        Print "" i`/_^Fndyu  
        Print "THERMAL IMAGE CALCULATION" IY6DZP  
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        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 =3OK 3|  
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        Print "found detector array at node " & detnode jZeY^T)f"  
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        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 6s\niro2  
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        Print "found differential detector area at node " & srcnode zbK=yOIOd  
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        GetTrimVolume detnode, trm ,/AwR?m  
        detx = trm.xSemiApe $2qZds[  
        dety = trm.ySemiApe I&~kwOP  
        area = 4 * detx * dety :+{G|goZ*  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety zY~  
        Print "sampling is " & nx & " by " & ny &C<K|F!j!  
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        'reset differential detector area dimensions to be consistent with sampling B*7Y5_N  
        pixelx = 2 * detx / nx 73B,I 0U  
        pixely = 2 * dety / ny eznt "Rr2  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ~$n4Yuu2[  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 &<6E*qM  
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        'reset the source power d4KT wn5g  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) tJ[yx_mf  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" -SZXUN  
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        'zero out irradiance array <WFA3  
        For i = 0 To ny - 1 0+MNu8t  
            For j = 0 To nx - 1 q/U(j&8W{  
                irrad(i,j) = 0.0 ST$~l7p  
            Next j MyB&mC7Es  
        Next i jGpSECs  
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        'main loop /ivcqVu]  
        EnableTextPrinting( False ) VuA7rIF$66  
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        ypos =  dety + pixely / 2 ^hq+ L^$^  
        For i = 0 To ny - 1 >KHR;W03  
            xpos = -detx - pixelx / 2 MCOiB <L6  
            ypos = ypos - pixely I?` }h}7.  
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            EnableTextPrinting( True ) HS>(y2}'  
            Print i Y~\71QE>  
            EnableTextPrinting( False )  [U9b_`  
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            For j = 0 To nx - 1 e??tp]PLn  
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                xpos = xpos + pixelx +UbSqp1BS  
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                'shift source -e< d//>  
                LockOperationUpdates srcnode, True kFKc9}7W  
                GetOperation srcnode, 1, op {!!df.h  
                op.val1 = xpos nOq?Q  
                op.val2 = ypos Qn= 3b:S-  
                SetOperation srcnode, 1, op GL;@heP  
                LockOperationUpdates srcnode, False iV9wqUkMv  
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                'raytrace m$<LO%<~p  
                DeleteRays PWeCk2xH  
                CreateSource srcnode ZK:dhwer  
                TraceExisting 'draw k1tJ$}  
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                'radiometry l-s%3E3  
                For k = 0 To GetEntityCount()-1 _vOV(#q2a  
                    If IsSurface( k ) Then VB>KT(n-b  
                        temp = AuxDataGetData( k, "temperature" ) :QKxpHi  
                        emiss = AuxDataGetData( k, "emissivity" ) & Tz@lvOv%  
                        If ( temp <> 0 And emiss <> 0 ) Then aD)$aK  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) <Z{pjJ/  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) eC%uu  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi cr GFU?8  
                        End If u.v 5!G  
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                    End If m]H[$ Q  
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                Next k y?=W  
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            Next j 758`lfz=_  
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        Next i hxG=g6:G  
        EnableTextPrinting( True ) s|er+-'  
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        'write out file 0|6]ps4Z7  
        fullfilepath = CurDir() & "\" & fname UI:YzR  
        Open fullfilepath For Output As #1 }f rij1/G  
        Print #1, "GRID " & nx & " " & ny M:t!g %  
        Print #1, "1e+308" 8CXZ7 p  
        Print #1, pixelx & " " & pixely "53'FRj_\  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 x"g-okLN  
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        maxRow = nx - 1 Dl C\sm  
        maxCol = ny - 1 dA,irb I0W  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) Q 6>7{\8l  
                row = "" 3=[#(p:  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) JFOto,6L:  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string ,m4M39MWJ  
            Next colNum                     ' end loop over columns MmIVTf4  
    !Cqm=q{K  
                Print #1, row @|I:A  
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        Next rowNum                         ' end loop over rows T,' {0q  
        Close #1 c}XuzgSY  
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        Print "File written: " & fullfilepath ^3>Qf  
        Print "All done!!" 4)]w"z0Pc  
    End Sub w$5~'Cbi  
    J#k3iE}  
    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: '*4>&V.yX  
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    找到Tools工具,点击Open plot files in 3D chart并找到该文件 8(AI|"A"-  
      
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    打开后,选择二维平面图: ^{ Kj{M22  
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    QQ:2987619807
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