切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1912阅读
    • 0回复

    [技术]十字元件热成像分析 [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6613
    光币
    27214
    光券
    0
    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。  bUcp8  
    xgxfPcI  
    成像示意图
    O|t>.<T?  
    首先我们建立十字元件命名为Target CR$wzjP j  
    "6d0j)YO  
    创建方法: >5t! Xt  
    l>;hQh  
    面1 : v*V( hMy  
    面型:plane @XJ7ff&  
    材料:Air a]p9 [Nk  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box BWxfY^,'&6  
    ?kR1T0lKkE  
    OJu>#   
    辅助数据: ?pZ"7kkD  
    首先在第一行输入temperature :300K, qy'-'UlIr  
    emissivity:0.1; K/zb6=->  
    %?[gBf[y  
    ,\i*vJ#f  
    面2 : {^1O  
    面型:plane #TNjQNg@O  
    材料:Air g(pr.Dw6  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box b>ZAkz)U+  
    :!_l@=l  
    Md4Q.8  
    位置坐标:绕Z轴旋转90度, lo!pslqsn  
    zg ,=A?  
    deAV:c  
    辅助数据: sUlf4<_zW  
    _>vH%FY  
    首先在第一行输入temperature :300K,emissivity: 0.1;  _".h(  
    X{x(p  
    {#kCqjWG  
    Target 元件距离坐标原点-161mm; Z7bJ<TpZ  
    LF7 }gQs ^  
    2Vti|@JYp  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 H{n:R *  
    q;[HUyY,  
    /Pe xtj<  
    探测器参数设定: "m{i`<,  
    ,Vq$>T@z  
    在菜单栏中选择Create/Element Primitive /plane DY#195H  
    K+|XI|1p  
    F^/KD<cgK  
    ?lkB{-%rQ  
    s=:)!M.i  
    ulzX$  
    元件半径为20mm*20,mm,距离坐标原点200mm。 H<|}p Z  
    `xx.,;S  
    光源创建: wb9(aS4  
    &wlD`0v  
    光源类型选择为任意平面,光源半角设定为15度。 0 7Yak<+~  
    )Wle CS_  
    O#k; O*s'  
    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。 hrnE5=iY  
    S!PG7hK2  
    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 8KJ`+"<=@  
    |Ogh-<|<  
    k.b=EX|  
    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。 7>z {2D  
    &OJ?Za@p@)  
    创建分析面: :xHKbWz6j  
    ;:Z5Ft m  
    "Bwz Fh  
    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。 0 \ U*  
    6am6'_{  
    YCE *Dm  
    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。 L~f~XgQ  
    ll0y@@Iy  
    FRED在探测器上穿过多个像素点迭代来创建热图 8Tg1 >q<  
    /fUdb=!Z  
    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。 U\Y0v.11  
    将如下的代码放置在树形文件夹 Embedded Scripts, }J6:D]Q  
    ?{aC-3VAT  
    QDW,e]A  
    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。 8H-yT1  
    Ms+ekY)  
    绿色字体为说明文字, QuEX|h,F  
    OD7^*j(p`  
    '#Language "WWB-COM" Y=|p}>.}  
    'script for calculating thermal image map ;`^_9 K  
    'edited rnp 4 november 2005 /ojx$Um  
    Q>Klkd5(  
    'declarations  I!?Xq  
    Dim op As T_OPERATION 7_PY%4T"  
    Dim trm As T_TRIMVOLUME 9QX!HQ|5y8  
    Dim irrad(32,32) As Double 'make consistent with sampling m-$}'mEO  
    Dim temp As Double rR":}LA^d  
    Dim emiss As Double m8PS84."]M  
    Dim fname As String, fullfilepath As String FRR05%K  
    5.ab/uk;M  
    'Option Explicit 1#c Tk  
    'm`}XGUBS  
    Sub Main iJE:>qOTD5  
        'USER INPUTS 1OExa<Zq  
        nx = 31 9,~7,Py}  
        ny = 31 7omHorU+  
        numRays = 1000 M.,DXEZT  
        minWave = 7    'microns Wcc4/:`Hu  
        maxWave = 11   'microns  :QP1!  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 @Ol(:{<  
        fname = "teapotimage.dat" ,vmn{gz  
    WPsfl8@D  
        Print "" ~5N oR  
        Print "THERMAL IMAGE CALCULATION" p~3 x=X4  
    AB\Ya4O"9  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 "[P3b"=gW  
    smfI+Z S"  
        Print "found detector array at node " & detnode *]HnFP  
    aL[6}U0(}  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ?Xvy0/s5  
    &*" *b\  
        Print "found differential detector area at node " & srcnode wdP(MkaV  
    N,K/Ya)1  
        GetTrimVolume detnode, trm VQqBo~  
        detx = trm.xSemiApe "G%</G8M  
        dety = trm.ySemiApe 66F?exr  
        area = 4 * detx * dety M5w/TN  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety E\DA3lq  
        Print "sampling is " & nx & " by " & ny ]i(/T$?~  
    3 e'6A^#  
        'reset differential detector area dimensions to be consistent with sampling O=+$X Pa|  
        pixelx = 2 * detx / nx o/7u7BQl2  
        pixely = 2 * dety / ny d2Q*1Q@u  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False q 0F6MAXj  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ' m~=sC_uL  
    hZHM5J~  
        'reset the source power bKmwXDv'  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) N8pL2y:R[P  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" -->0e{y  
    siI%6Gn;  
        'zero out irradiance array In_"iEo,  
        For i = 0 To ny - 1 3%?tUt  
            For j = 0 To nx - 1 ou-UR5  
                irrad(i,j) = 0.0 ':;k<(<-  
            Next j 4zS0kk;+  
        Next i ;DK%!."%  
    @~$"&B  
        'main loop 2lsUCQI;  
        EnableTextPrinting( False ) ]Ac}+?  
    ~x8nC%qPvq  
        ypos =  dety + pixely / 2 AcuF0KWw/  
        For i = 0 To ny - 1 :sg}e  
            xpos = -detx - pixelx / 2 lh'S_p8g  
            ypos = ypos - pixely nI]EfHU  
    HQ-+ +;Q  
            EnableTextPrinting( True ) =w+8q1!o  
            Print i ?nW>' z  
            EnableTextPrinting( False )  <EU R:  
    I)'bf/6?  
    6qZ\^ U  
            For j = 0 To nx - 1 =${.*,o  
    m4@NW*G{  
                xpos = xpos + pixelx 7C7.}U  
    ]S&ki}i&  
                'shift source P!|Z%H  
                LockOperationUpdates srcnode, True ??p%_{QY~b  
                GetOperation srcnode, 1, op G~<UP(G  
                op.val1 = xpos oV:oc,  
                op.val2 = ypos b`-|7<s  
                SetOperation srcnode, 1, op ia'z9  
                LockOperationUpdates srcnode, False =|agW.l  
     %nY\"  
    raytrace L_!ShE  
                DeleteRays CfU|]<  
                CreateSource srcnode =lJ ?yuc  
                TraceExisting 'draw ;Z{D@g+  
    p5#x7*xR6  
                'radiometry p@G7}'|eyA  
                For k = 0 To GetEntityCount()-1 @ye!? %  
                    If IsSurface( k ) Then k B>F(^  
                        temp = AuxDataGetData( k, "temperature" ) vv ,4n&D  
                        emiss = AuxDataGetData( k, "emissivity" ) GHGyeqNM  
                        If ( temp <> 0 And emiss <> 0 ) Then ]Orx %8QS!  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) *(Dmd$|0|  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 4MS<t FH)  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi :82h GU  
                        End If 3{3@>8{w  
    w95M B*N  
                    End If }'x;J   
    \2s`mCY  
                Next k tz@MZs09  
    )J S6W  
            Next j sFFQ]ST2p  
    R p&J!hlA  
        Next i LQR2T5S/Q,  
        EnableTextPrinting( True ) i 6G40!G=)  
    Tzex\]fw  
        'write out file BNK]Os  
        fullfilepath = CurDir() & "\" & fname &j 4pC$Dj  
        Open fullfilepath For Output As #1 5Ml=<^  
        Print #1, "GRID " & nx & " " & ny G|g^yaq>  
        Print #1, "1e+308" B'}?cG]  
        Print #1, pixelx & " " & pixely ?mg@zq8  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 "Q.*  
    ^AP8T8v  
        maxRow = nx - 1 9wWBE<}>u  
        maxCol = ny - 1 C{}_Rb'x  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 3%Y:+%VE  
                row = "" &$ h~Q  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) Q7865  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string eQbHf  
            Next colNum                     ' end loop over columns Uq  .6h  
    )Z/"P\qo  
                Print #1, row "bo0O7InOV  
    P"w\hF  
        Next rowNum                         ' end loop over rows Rg?6eN  
        Close #1 /}?7Eni  
    !a@)6or  
        Print "File written: " & fullfilepath OBWWcL-  
        Print "All done!!" #V!a<w4_  
    End Sub bx3Q$|M?  
    USBQEt  
    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: P=94  
    s6bsVAO>  
     j#](Q!  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 s*izhjjX  
      
    l[}4 X/  
    U[C4!k:0  
    打开后,选择二维平面图: \fA{sehdL  
    C ^Y\?2h1  
     
    分享到