切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1256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
    6374
    光币
    26015
    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。 '=+gwe M  
    U]&/F{3 im  
    成像示意图
    8{ +KNqz  
    首先我们建立十字元件命名为Target V$_.&S?(Y  
    t>2EZ{N +y  
    创建方法: t~|`RMn"  
    !ir%Pz ^)  
    面1 : ?jU 3%"  
    面型:plane QuBA'4ht  
    材料:Air #bS}?fj  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box _Qq lOc9  
    SAU` u]E  
    w5vzj%6i  
    辅助数据: _&M^}||UH  
    首先在第一行输入temperature :300K, R"{P#U,HNO  
    emissivity:0.1; y\n#`*5k  
    DFb hy  
    yb-4[C:i  
    面2 : `Bb32L   
    面型:plane !ZM*)6^  
    材料:Air QJ%N80  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box Ih[k{p  
    [M#(su0fv  
    fjMmlp  
    位置坐标:绕Z轴旋转90度, s w50lId  
    8yybZ@  
    /GF"D5  
    辅助数据: FzF#V=9lP  
    hb(H-`16  
    首先在第一行输入temperature :300K,emissivity: 0.1; lSy_cItF  
    RSx{Gbd4X  
    4j(*%da  
    Target 元件距离坐标原点-161mm; F jW%M;H  
    mln%Rd6u/  
    B}@CtVWFz  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 RLO<5L  
    +1K= ]#a  
    6%V#_]  
    探测器参数设定: ;)vs=DK:)  
    z"*3p8N  
    在菜单栏中选择Create/Element Primitive /plane a_z f*;  
    lI3d _cU  
    IH"_6s#$&  
    `j'gt&  
    6ZQ$5PY  
    aNgJm~K0P  
    元件半径为20mm*20,mm,距离坐标原点200mm。 ^[EXTBk@:  
    6&btAwvOHx  
    光源创建: 8\bZ?n#dn  
    XvZ5Q  
    光源类型选择为任意平面,光源半角设定为15度。 @2eH;?uO  
    u&'&E   
    =%{E^z>1  
    我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ?SX0e(+}}  
    Q) iN_|  
    我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线 Hiih$O+  
    6-\C?w A  
    -AXMT3p=1  
    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。 ?Hbi[YD  
    w69G6G(  
    创建分析面: m@yx6[E#  
    2\#~%D>[  
    MNX-D0`g  
    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。 ( `d_DQ  
    N8Un42  
    LufZ,  
    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。 Mvk#$:8e  
    a61?G!]  
    FRED在探测器上穿过多个像素点迭代来创建热图 D[(T--LLT  
    'D?sRbJ=  
    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。 h)T-7b  
    将如下的代码放置在树形文件夹 Embedded Scripts, !< ^`Sx/+  
    $]b&3_O$N8  
    aIE\B4w  
    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。 EU()Nnm2  
    tmC9p6%  
    绿色字体为说明文字, Ot3+<{  
    :LB< z#M  
    '#Language "WWB-COM" WhL 1OG  
    'script for calculating thermal image map ^j'vM\^`ml  
    'edited rnp 4 november 2005 fG /wU$B  
    3M{b:|3/q  
    'declarations :yAvo4 )  
    Dim op As T_OPERATION mGUl/.;yp-  
    Dim trm As T_TRIMVOLUME C5oIl_t  
    Dim irrad(32,32) As Double 'make consistent with sampling _ 3>|1RB  
    Dim temp As Double ?Tk4Vt  
    Dim emiss As Double >V3pYRA   
    Dim fname As String, fullfilepath As String I[I]C9D  
    k N$L8U8f  
    'Option Explicit EB>rY  
    b"z9Dpv  
    Sub Main #|{^k u  
        'USER INPUTS !O#NP!   
        nx = 31 :6Sb3w5h  
        ny = 31 _:l<4u !  
        numRays = 1000 cH$Sk  
        minWave = 7    'microns %LZf= `:(  
        maxWave = 11   'microns lb`2a3W/  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 vM2\tL@"  
        fname = "teapotimage.dat" >5-]Ur~  
    `!g XA.9Uv  
        Print "" !yX4#J(  
        Print "THERMAL IMAGE CALCULATION" 3mM.#2=@>  
    Ci^tP~)&"  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 '^.}5be&  
    c95{Xy  
        Print "found detector array at node " & detnode :n<<hR0d  
    ^k}jPc6  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 p uLQ_MNV  
    )haHI)xR  
        Print "found differential detector area at node " & srcnode {!vz 6QDS  
    iG;GAw|E  
        GetTrimVolume detnode, trm EYF]&+ 9  
        detx = trm.xSemiApe Qws#v}xF  
        dety = trm.ySemiApe r`(U3EgP  
        area = 4 * detx * dety &tE#1<k  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety )|@UY(VZ^  
        Print "sampling is " & nx & " by " & ny ZN?UkFnE  
    afa7'l=^i  
        'reset differential detector area dimensions to be consistent with sampling =24<d!R  
        pixelx = 2 * detx / nx +Udlt)H  
        pixely = 2 * dety / ny hgi9%>o UB  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False K%"cVqb2V  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 APR%ZpG  
    s*DDO67\W  
        'reset the source power &D~70N\L  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Px))O&w{  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" hkL[hD  
     ,M&[c|  
        'zero out irradiance array oLp:Z=  
        For i = 0 To ny - 1 ?(CMm%(8  
            For j = 0 To nx - 1 ,HdFE|  
                irrad(i,j) = 0.0 K r&HT,>B  
            Next j H A(e  
        Next i X pd^^  
    =1"8ua  
        'main loop Y-WY Q{  
        EnableTextPrinting( False ) +}@HtjM  
    If_S_A c  
        ypos =  dety + pixely / 2 >2l;KVm%  
        For i = 0 To ny - 1 Y@Kp'+t(!  
            xpos = -detx - pixelx / 2 bu#}`/\_  
            ypos = ypos - pixely -3<5,Q{G+  
    vWwnC)5  
            EnableTextPrinting( True ) \ oIVE+L/P  
            Print i 8vcV-+x  
            EnableTextPrinting( False ) )5j%."  
    WeTsva+  
    rE bC_<  
            For j = 0 To nx - 1 0VB~4NNR  
    dSb|hA}@  
                xpos = xpos + pixelx n(b(H`1n  
    cFoDR  
                'shift source >]k'3|vV  
                LockOperationUpdates srcnode, True '%`W y@  
                GetOperation srcnode, 1, op !#nlWX :~  
                op.val1 = xpos :sBg+MS  
                op.val2 = ypos *Ki ],>_~  
                SetOperation srcnode, 1, op r c7"sIkV  
                LockOperationUpdates srcnode, False wvm`JOP:A  
    $3sS&i<  
    raytrace u5 EHzoq  
                DeleteRays d\dt}&S 5  
                CreateSource srcnode |wZ8O}O{E  
                TraceExisting 'draw 0f 1Lu) 2  
    gaC^<\J  
                'radiometry #s1O(rLRl  
                For k = 0 To GetEntityCount()-1 ;jTP|q?|{  
                    If IsSurface( k ) Then 9psX"*s  
                        temp = AuxDataGetData( k, "temperature" ) Dm6}$v'0  
                        emiss = AuxDataGetData( k, "emissivity" ) Cd#>,,\z  
                        If ( temp <> 0 And emiss <> 0 ) Then ' @M  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) i=-zaboo  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) j3rBEQ,R  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi a'ViyTBo  
                        End If PqIGc  
    pAYH"Q6~)I  
                    End If $Tt@Xu  
    DEaO= p|  
                Next k m El*{]  
    l/_3H\iM  
            Next j uRQm.8b  
    %lchz /  
        Next i d^IOB|6Q  
        EnableTextPrinting( True ) o*\kg+8  
    sD.bBz  
        'write out file Ay!=Yk ^~  
        fullfilepath = CurDir() & "\" & fname vt[4"eU  
        Open fullfilepath For Output As #1 _`L,}=um'  
        Print #1, "GRID " & nx & " " & ny uYS?# g  
        Print #1, "1e+308" r:y *l4  
        Print #1, pixelx & " " & pixely viAvD6e  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 FK{ YRt  
    W?G4\ubM3<  
        maxRow = nx - 1 rB|D^@mG  
        maxCol = ny - 1 "TKf" zc  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) V{fYMgv  
                row = "" Y2j>lf?8  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y)  FZnkQ  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string 9tXLC|yl?  
            Next colNum                     ' end loop over columns MwL' H<  
    tn;e PcU  
                Print #1, row &~U8S^os  
    $g _h9L  
        Next rowNum                         ' end loop over rows =A<kDxqH  
        Close #1 \i "I1xU  
    =R!=uml(  
        Print "File written: " & fullfilepath O%A:2Y79  
        Print "All done!!" F$ x@ ]  
    End Sub f!*b8ND^R  
     o )cd!,h  
    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: +}>whyX1  
    Q$W0>bUP  
    @ h([c  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 {Zjnf6d]  
      
    TvAA  
    z['>`Kt  
    打开后,选择二维平面图: 9IMtqL&  
    `Te n2(D  
     
    分享到