切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1364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
    6401
    光币
    26150
    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。 NCk r /#!  
    J<dVT xK12  
    成像示意图
    3+G@g#MY  
    首先我们建立十字元件命名为Target Z]j*9#G1s  
    ]jaQ[g$F  
    创建方法: l:<?{)N`  
    /`6ZAo m9  
    面1 : V %YiAr>  
    面型:plane mqAWL:VvQ7  
    材料:Air v {jQek4  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box KOp162X>r  
    elG<k%/2  
    (h5'9r  
    辅助数据: <Gt2(;  
    首先在第一行输入temperature :300K, 1I<rXY(a`  
    emissivity:0.1; ]&i.b+^  
    ;ml)l~~YU  
    u a~CEs  
    面2 : 4x;/HEb7?  
    面型:plane vpld*TL*  
    材料:Air bLQ ^fH4ww  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box k-HCeZ  
    vt;{9\Y  
    f3Hed  
    位置坐标:绕Z轴旋转90度, '`XX "_k3  
    o_D?t-XH  
    Jnna$6G)B  
    辅助数据: hvuIxqv!y  
    @1 U&UH  
    首先在第一行输入temperature :300K,emissivity: 0.1; NyVnA  
    m"fNK$_d  
    P~G1EK|4  
    Target 元件距离坐标原点-161mm; HKqwE=NZ  
    yI ld75S`  
    DVK)2La  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 /u0' 6V  
    rfgI$eu   
    |pmZ.r  
    探测器参数设定: +H9>A0JF  
    phn9:{TI  
    在菜单栏中选择Create/Element Primitive /plane P4F3Dc  
    $`wMX{  
    L. EiO({W  
    ~<k,#^"}X  
    7G\\{  
    md q;R*`  
    元件半径为20mm*20,mm,距离坐标原点200mm。 '^Ql]% _  
    ??i,Vr@)w  
    光源创建: p8\zG|b5  
    Wt=|  
    光源类型选择为任意平面,光源半角设定为15度。 EC\yz H*X  
    1xbK'i:-S  
    lK4M.QV ?\  
    我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 E[*Fz1>  
    +Wx{:  
    我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线 ^ mS o1?<  
    KM !k$;my  
    >zhO7,=,  
    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。 nIoPC[%_  
    :J :, m  
    创建分析面: *0|IXGr  
    n#:N;T;\a  
    El o Me~a3  
    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。 CXO2N1~(J  
    e+j)~RBnu3  
    ,uPJ_oZs  
    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。 u_ '!_T L  
    :OkT? (i  
    FRED在探测器上穿过多个像素点迭代来创建热图 a?6a b+7#  
    [ e8x&{L-_  
    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。 \igmv]G%  
    将如下的代码放置在树形文件夹 Embedded Scripts, gt ";2,;X  
    VB?O hk]<  
    Cxcr/9  
    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。 KMV=%o  
    +Ag!?T  
    绿色字体为说明文字, Xu>r~^w=S  
    q~5 9F@  
    '#Language "WWB-COM" PmR~c,  
    'script for calculating thermal image map w,Lvt }  
    'edited rnp 4 november 2005 T`9u!#mT=  
    ^m /oDB-  
    'declarations P{5-Mx!{&  
    Dim op As T_OPERATION f_imyzP   
    Dim trm As T_TRIMVOLUME #!$GH_  
    Dim irrad(32,32) As Double 'make consistent with sampling !TP@- X;  
    Dim temp As Double E%'~'[Q  
    Dim emiss As Double [b/k3&O'  
    Dim fname As String, fullfilepath As String .(X lg-H,  
    F! X}(N?t  
    'Option Explicit 1$2D O  
    m "M("%  
    Sub Main HoLv`JA  
        'USER INPUTS 8UMF q  
        nx = 31 1t Jg#/?  
        ny = 31 c(/VYMJZ&  
        numRays = 1000 < n:}kQTT  
        minWave = 7    'microns wBInq~K_  
        maxWave = 11   'microns ErT{(t7  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 !{82D[5  
        fname = "teapotimage.dat" /%I7Vc  
    Lj"A4i_  
        Print "" Qf| U0  
        Print "THERMAL IMAGE CALCULATION" H%1$,]F  
    v$)q($}p  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 7nVRn9Hn  
    AWjm~D-?  
        Print "found detector array at node " & detnode =B];?%  
    cNKUu~C+  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 WnH UE  
    *1'`"D~  
        Print "found differential detector area at node " & srcnode o%4Gd~  
    k;EPpr-{  
        GetTrimVolume detnode, trm enTW0U}  
        detx = trm.xSemiApe _oB_YL;,*  
        dety = trm.ySemiApe kwud?2E  
        area = 4 * detx * dety j6,ZEm  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety ;oxAe<VIj  
        Print "sampling is " & nx & " by " & ny <|*'O5B  
    #-Z8Z i"44  
        'reset differential detector area dimensions to be consistent with sampling X]y )ZF26  
        pixelx = 2 * detx / nx d$Y7u  
        pixely = 2 * dety / ny gUR]{dq^'  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False jhGlG-^  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 Gs*G<P"  
    @[6,6:h|  
        'reset the source power &5%dhc4&!&  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ow/57P  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" npDIX  
    vMs;>lhtg  
        'zero out irradiance array o]LRzI  
        For i = 0 To ny - 1 #u5~0,F  
            For j = 0 To nx - 1 F=)&98^v$_  
                irrad(i,j) = 0.0 f7hXQ|$  
            Next j QR> Y%4 ;h  
        Next i W0zbxJKjd  
    &48_2Q"{  
        'main loop d"U(`E=H9  
        EnableTextPrinting( False ) MDRe(rF=  
     UkfB^hA  
        ypos =  dety + pixely / 2 3I|3wQ&#(  
        For i = 0 To ny - 1 XTeb9h)3  
            xpos = -detx - pixelx / 2 Vh<A2u3&  
            ypos = ypos - pixely >~\w+^2f8  
    *zWWmxcJa  
            EnableTextPrinting( True ) S:8OQI  
            Print i ]bgY6@M  
            EnableTextPrinting( False ) ~/IexQB&  
    &*&?0ov^"  
    "Jy~PcJZ1  
            For j = 0 To nx - 1 [<wbbvXR  
    =C f(B<u  
                xpos = xpos + pixelx O{k:yVb  
    eX2<}'W<  
                'shift source [ B0K  
                LockOperationUpdates srcnode, True 15zrrU~D  
                GetOperation srcnode, 1, op !RlC~^ -  
                op.val1 = xpos uO >x:*^8  
                op.val2 = ypos ecX/K.8l  
                SetOperation srcnode, 1, op s(&;q4|  
                LockOperationUpdates srcnode, False )~rB}>^Z  
    `BnP[jF  
    raytrace cX At :m  
                DeleteRays GIv){[i  
                CreateSource srcnode XNH4==4  
                TraceExisting 'draw P` '$  
    -U>7 H`5  
                'radiometry Jbp5'e _  
                For k = 0 To GetEntityCount()-1 {5Eyr$  
                    If IsSurface( k ) Then TK>{qxt:=  
                        temp = AuxDataGetData( k, "temperature" ) d<@Mdo<;?g  
                        emiss = AuxDataGetData( k, "emissivity" ) 3D)b*fPc  
                        If ( temp <> 0 And emiss <> 0 ) Then .}9FEn 8  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) V+w u  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Cj&$%sO1  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi bj"z8kP  
                        End If 9b6!CNe!  
    [BBpQN.^q6  
                    End If $Kq<W{H3ut  
    yty` 2$O  
                Next k agaq`^[(P  
    C>*n9l[M~  
            Next j M^H90GN)X  
    E '%lxr  
        Next i ,w&:_n  
        EnableTextPrinting( True ) =s'7$D}0.  
    w{'2q^>6*  
        'write out file <4zT;:NQ  
        fullfilepath = CurDir() & "\" & fname <{019Oa  
        Open fullfilepath For Output As #1 C(]'&~}(  
        Print #1, "GRID " & nx & " " & ny A/Khk2-:  
        Print #1, "1e+308" JCQ:+eqt  
        Print #1, pixelx & " " & pixely  q{X T  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 *?8RXer  
    Q#WE|,a  
        maxRow = nx - 1 3 Lje<KzL  
        maxCol = ny - 1 w3#`1T`N  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X)  #[ :w  
                row = "" s#lto0b"8  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) 'XTs -=  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string 6s,2NeVWa  
            Next colNum                     ' end loop over columns ;,0lUcV  
    EDN(eh(_  
                Print #1, row e d;"bb  
    M7VID6J.  
        Next rowNum                         ' end loop over rows 797X71>  
        Close #1 Tiprdvm<  
    VD#!ztcY'  
        Print "File written: " & fullfilepath ,U%=rfB~  
        Print "All done!!" 5OB]x?4]  
    End Sub  5T/J%  
    BPWnck=%  
    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: GEtbs+[  
    [EGx  
    ]xR4->eix  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 /Ri,>}n  
      
    q2!'==h2i  
    nx;$dxx_Ws  
    打开后,选择二维平面图: 4zzlazU  
    qG^_c;l6a  
     
    分享到