切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1492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
    6421
    光币
    26250
    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。 ;U Yc  
    Nl@k*^  
    成像示意图
    E\0X`QeY  
    首先我们建立十字元件命名为Target h T<n1q~  
    WsR+Np@c  
    创建方法: ?^ZXU0IkP  
    BQ#3QL't  
    面1 : rH&G<o&,  
    面型:plane V!4a*,Pz  
    材料:Air Jf7frzw  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box B'-I{~'/  
    "O*x' XhN  
    #'@i lk/.  
    辅助数据:  1,,|MW  
    首先在第一行输入temperature :300K, P;vxT}1  
    emissivity:0.1; V8hO8  
    &D]p,  
    c'Z: 9?#5  
    面2 : x4m 5JDC  
    面型:plane  H;NbQ  
    材料:Air k[\a)WcY8  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box ebC)H  
    9#7J:PfZ<  
    $5AC1g'  
    位置坐标:绕Z轴旋转90度, IG< H"tQ  
    22 &'@C>  
    a+`D'?z  
    辅助数据: pMR,#[U<  
    { p;shs5  
    首先在第一行输入temperature :300K,emissivity: 0.1; jk*tL8?i  
    ^~$\ g]  
    PU1,DU  
    Target 元件距离坐标原点-161mm; gbDX7r-  
    A`[@ 8  
    3`*Kav>"  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 F;8*H1  
    g # S0V  
    ? }yfKU`  
    探测器参数设定: VfSj E.|  
    T%$jWndI  
    在菜单栏中选择Create/Element Primitive /plane ba3*]01Yb  
    7" 4z+w  
    k?*KnfVh!  
    qnChM ;)  
    R_ ZK0ar  
    +bA%  
    元件半径为20mm*20,mm,距离坐标原点200mm。 thc <xxRP  
    -fy9<  
    光源创建: <YB9Ac~}z  
    ?Q0I'RC  
    光源类型选择为任意平面,光源半角设定为15度。 k()$:-V  
    xb:&(6\F  
    rf.`h{!!  
    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。 wi_'iv  
    4;<ut$G  
    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 jZteooJG|  
    pTJX""C  
    3BG>Y(v  
    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。 `JB?c  
    Z hd#:d  
    创建分析面: u JY)4T  
    TP%+.#Fu  
    _%/}>L>-`8  
    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。 6gH{ R$7L=  
    0hY{<^"Y  
    z//VlB  
    到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 .uF[C{RnO  
    Jrxz'9qRG  
    FRED在探测器上穿过多个像素点迭代来创建热图 b[I8iSkfi  
    h6~$/`&]b  
    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。 >R\lqLILb,  
    将如下的代码放置在树形文件夹 Embedded Scripts, `R"~v/x  
    U75Jp%bL  
    -' g*^  
    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。 *.#oxcll  
    rV6/Tdy  
    绿色字体为说明文字, bN$r k|  
    =WIJ>#Go<  
    '#Language "WWB-COM" *`_{  
    'script for calculating thermal image map 0@I S  
    'edited rnp 4 november 2005 m3bCZ 9iE  
    #bH_Dg5I  
    'declarations .8(OT./  
    Dim op As T_OPERATION Fqy\CMC  
    Dim trm As T_TRIMVOLUME ,:LA.o}h  
    Dim irrad(32,32) As Double 'make consistent with sampling }%7 NF*  
    Dim temp As Double @$9'@")  
    Dim emiss As Double T*g:# ^4  
    Dim fname As String, fullfilepath As String HpZ1xT  
    Zf$Np50@(  
    'Option Explicit Gg Jf7ie4  
    #J (~_%Wi  
    Sub Main 8N&+7FK  
        'USER INPUTS _g%TSumvq<  
        nx = 31 ^9Qy/Er'  
        ny = 31 JjaoOe  
        numRays = 1000 1#IlWEg  
        minWave = 7    'microns F8-?dpf'  
        maxWave = 11   'microns I9h ?;(  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 'R-3fO???  
        fname = "teapotimage.dat" @+3kb.P%7  
    (T`E!A0I\?  
        Print "" 2 3OC2|  
        Print "THERMAL IMAGE CALCULATION" HK`I\,K  
    wLK07e(  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 (aOv#Vor]%  
    fU=B4V4@  
        Print "found detector array at node " & detnode 8J$|NYv_b  
    1`ayc|9BR  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 PB;eHy  
    1-lu\"H`  
        Print "found differential detector area at node " & srcnode %_!bRo  
    VD_$$Gn*q  
        GetTrimVolume detnode, trm 2hzsKkrA {  
        detx = trm.xSemiApe _ODbY;M  
        dety = trm.ySemiApe _S>JKz  
        area = 4 * detx * dety QQWadVQo  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety lpz2 m\  
        Print "sampling is " & nx & " by " & ny 'Ut7{rZ5  
    0lhVqy}:}o  
        'reset differential detector area dimensions to be consistent with sampling 89r DyRJ;  
        pixelx = 2 * detx / nx /p8dZ+X  
        pixely = 2 * dety / ny %CK^Si%+  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ZK>WW  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ` ,SiA-3*  
     }Y;K~J  
        'reset the source power /!c${W!sY  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) |yx6X{$k  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" xlQBe-Wg  
    YW7b)u Yf  
        'zero out irradiance array @Y1s$,=xB  
        For i = 0 To ny - 1 6i1LjLB  
            For j = 0 To nx - 1 r-:Uz\gM  
                irrad(i,j) = 0.0 vM5k_D  
            Next j zux{S; :?  
        Next i l<A|d{"]  
    w@{=nD4p  
        'main loop @nux9MX<9  
        EnableTextPrinting( False ) G K7![p  
    Mnscb  
        ypos =  dety + pixely / 2 HSc~*Q  
        For i = 0 To ny - 1 9jw\s P@  
            xpos = -detx - pixelx / 2 thI F&  
            ypos = ypos - pixely u:=7l  
    `\}v#2VJ  
            EnableTextPrinting( True ) oz,e/v8~  
            Print i RS8Hf~0G  
            EnableTextPrinting( False ) XT4{Pe7{[P  
    A<??T[  
    ,^2>k3=  
            For j = 0 To nx - 1 <i&_ooX  
    Ru>MFG  
                xpos = xpos + pixelx ]@phF _  
    R=QZgpR  
                'shift source <$IM8Y5p+w  
                LockOperationUpdates srcnode, True Z'.AAOG  
                GetOperation srcnode, 1, op "$YJX1u3  
                op.val1 = xpos a ?)NC  
                op.val2 = ypos `~By)?cT_>  
                SetOperation srcnode, 1, op Zcx`SC-0  
                LockOperationUpdates srcnode, False =,6z4" )  
    Zg{KFM%  
    raytrace rR(X9i  
                DeleteRays $xPaYf  
                CreateSource srcnode oYH^_V  
                TraceExisting 'draw }khV'6"'|  
    5Ou`z5S\k  
                'radiometry oYm[V<nIl  
                For k = 0 To GetEntityCount()-1 DK: o]~n  
                    If IsSurface( k ) Then Na]:_K5Dp  
                        temp = AuxDataGetData( k, "temperature" ) )QU  
                        emiss = AuxDataGetData( k, "emissivity" ) <+?7H\b  
                        If ( temp <> 0 And emiss <> 0 ) Then GkQpELO:  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) J;8IY=  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 0"28'  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi j~[z2tV  
                        End If jK& h~)  
    e?8FN. q  
                    End If 2{H@(Vgpbr  
    s;01u_  
                Next k {tYZt4!{^  
    G}b]w~ML ~  
            Next j LnH?dy  
    @1o/0y"  
        Next i T[UN@^DP(  
        EnableTextPrinting( True ) H4&lb}  
    }HFN3cq;C  
        'write out file ,9zjFI  
        fullfilepath = CurDir() & "\" & fname 3q\,$*D.  
        Open fullfilepath For Output As #1 5K>3My#  
        Print #1, "GRID " & nx & " " & ny uKUiV%p!  
        Print #1, "1e+308" "K6&dk jY  
        Print #1, pixelx & " " & pixely 4;yKOQD|  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 !Prg_6 `  
    &8Cu#^3  
        maxRow = nx - 1 Q ayPo]O  
        maxCol = ny - 1 3Q.#c,`jV  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 7&jTtKLj  
                row = "" n|9-KTe7|*  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) 5\:^ y'g[  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string v&DI`xn~  
            Next colNum                     ' end loop over columns 'YmIKIw  
    CQF:Rnb  
                Print #1, row D#cyOrzy  
    4'/nax$Bx;  
        Next rowNum                         ' end loop over rows i&bA2p3+d  
        Close #1 SJb&m-  
    fI?>+I5  
        Print "File written: " & fullfilepath H<i]V9r  
        Print "All done!!" &^ 1$^=  
    End Sub N} G[7Rp8l  
    zy/@ WFPE  
    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: y\4L{GlBM  
    .o(fe\KHf  
    wh$sn:J  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 X( \ AB  
      
    4":KoS`,j  
    *+Ek0M  
    打开后,选择二维平面图: 9-&Ttbb4)0  
    /M1ob:m  
     
    分享到