切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1193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
    6358
    光币
    25935
    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。 X~; *zYd5  
    <&M5#:u  
    成像示意图
    6Vu??qBy  
    首先我们建立十字元件命名为Target ,n5 [Y)  
    %%O_:@9x,  
    创建方法: Mr K?,7*Xi  
    Me,AE^pgL'  
    面1 : #0qMYe>Y  
    面型:plane oB}rd9  
    材料:Air !.{{QwZ  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box fV/  
    s.}:!fBk  
    ~Oj-W6-+&,  
    辅助数据: A56aOI=  
    首先在第一行输入temperature :300K, yF&?gPh&  
    emissivity:0.1; 8\Z/mU*4  
    0ipYXbC  
    !jJH}o/KW  
    面2 : lFM'F[-?-  
    面型:plane vi.q]$ohbV  
    材料:Air F>3fP  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box YC~kq?  
    j~9,Ct  
    ;V~~lcD&Y`  
    位置坐标:绕Z轴旋转90度, iuq%Q\0@w  
    2! bE|  
    [Hp"a^~r|  
    辅助数据: ] yXrD`J!  
    Riz!HtyR  
    首先在第一行输入temperature :300K,emissivity: 0.1; ;6zp,t0  
    (V~PYf%  
    .We"j_ }  
    Target 元件距离坐标原点-161mm; =gr3a,2  
    2KmPZ&r  
    ) /<\|mR  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 *(@[E  
    s%qK<U4@;Q  
    v:] AS:  
    探测器参数设定: %g&i.2v  
    e_pyjaY!s  
    在菜单栏中选择Create/Element Primitive /plane !tD,phca~  
    C,m o4,Q  
    jG3i )ALx  
    7^:0?Q  
    e6?h4}[+*  
    s8N\cOd#i  
    元件半径为20mm*20,mm,距离坐标原点200mm。 Me*]Bh  
     ,  
    光源创建: 2L_ts=  
    \uV;UH7qe  
    光源类型选择为任意平面,光源半角设定为15度。 o93A:fc  
    G(~"Zt}?  
    K:eP Il{JE  
    我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 d<v>C-nk%  
    f)+fdc  
    我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线 &Qdd\h#  
    bP 2IX  
    az]S&\i7T  
    功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 V+l>wMeo  
    Z*|qbu)  
    创建分析面: NN W*  
    )#dP:  
    )rs);Pl  
    到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 )xQA+$H#4  
    @kLpK  
    MW+]w~7_Q  
    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。 vx_v/pD  
    ~l@SGHx  
    FRED在探测器上穿过多个像素点迭代来创建热图 =ITMAC\  
    d(L u|/~  
    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。 F+S;u=CKx  
    将如下的代码放置在树形文件夹 Embedded Scripts, |f~p3KCfV  
    bgm$<;`U  
    XoaBX2  
    打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 H{P"$zj`l  
    )nS;]7pB@  
    绿色字体为说明文字, bd2"k;H<o  
    k]"Rg2>%  
    '#Language "WWB-COM" v:<UbuJw  
    'script for calculating thermal image map zRJopcE<  
    'edited rnp 4 november 2005 s Hu~;)  
    -_ [Z5%B  
    'declarations a-,BBM8|  
    Dim op As T_OPERATION xF_ Y7rw1w  
    Dim trm As T_TRIMVOLUME $IQ  !g  
    Dim irrad(32,32) As Double 'make consistent with sampling 3L4lk8Dd  
    Dim temp As Double $N=A,S  
    Dim emiss As Double 6;GL>))'  
    Dim fname As String, fullfilepath As String !_cT_ WHty  
    cV5Lp4wY?  
    'Option Explicit t\]CdH`+  
    o=2y`Eq  
    Sub Main xgtdmv%  
        'USER INPUTS Tp`by 1s  
        nx = 31 ^6ZA2-f/<8  
        ny = 31 n}yqpW!%n  
        numRays = 1000 b#.hw2?a`  
        minWave = 7    'microns `W8GfbL  
        maxWave = 11   'microns )=X8kuB~  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 Y2w 9]:J  
        fname = "teapotimage.dat" W]n%$a  
    ;{ Y|n_  
        Print "" +MeEy{;  
        Print "THERMAL IMAGE CALCULATION" `{/z\  
    Bj J$I^  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 oG5JJpLT  
    ab' f:  
        Print "found detector array at node " & detnode y8wOJZ<K  
    o;\0xuM@  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 VzMoWD;  
    LC\Ys\/,U  
        Print "found differential detector area at node " & srcnode Vl?R?K=`~J  
    ^^%sPtp  
        GetTrimVolume detnode, trm pP)0 l  
        detx = trm.xSemiApe t@!X1?`w  
        dety = trm.ySemiApe X{ZBS^M  
        area = 4 * detx * dety z_< 7T4  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety  vu  YH+  
        Print "sampling is " & nx & " by " & ny >)U 7$<&b  
    &|26x >  
        'reset differential detector area dimensions to be consistent with sampling NJ 7N*   
        pixelx = 2 * detx / nx \A5cM\-  
        pixely = 2 * dety / ny >wM%|j'  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False /U6G?3b  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 >&aFSL,f  
    Jnm{i|6N  
        'reset the source power V4 Pf?g  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) l0u6nGkh  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" .7Ys@;>B  
    Y 1Bj++?2  
        'zero out irradiance array Uz\B^"i|  
        For i = 0 To ny - 1 or ~o'  
            For j = 0 To nx - 1 W UdKj  
                irrad(i,j) = 0.0 OcMd'fwO  
            Next j us4.-L  
        Next i 5}~*,_J2Z  
    ~7b '4\  
        'main loop 1p23&\\~  
        EnableTextPrinting( False ) ]^&DEj{  
    rr*",a"}m  
        ypos =  dety + pixely / 2 /[GOs*{zB  
        For i = 0 To ny - 1 ,u{d@U^)3@  
            xpos = -detx - pixelx / 2 [={pF q`  
            ypos = ypos - pixely WMZa6cH  
    ()(@Qcc  
            EnableTextPrinting( True ) <=cj)  
            Print i LlRvm/  
            EnableTextPrinting( False ) HHCsWe-  
    @o44b!i  
    q uv`~qn  
            For j = 0 To nx - 1 R/b)hP ~  
    ).N}x^  
                xpos = xpos + pixelx Z,,Da|edH  
    } ~=53$+  
                'shift source s:R>uGYOd  
                LockOperationUpdates srcnode, True t_3)}  
                GetOperation srcnode, 1, op X5qU>'?`  
                op.val1 = xpos A! <R?  
                op.val2 = ypos mh.0% 9`9  
                SetOperation srcnode, 1, op A,lcR:@w  
                LockOperationUpdates srcnode, False d<V+;">2  
    KHcf P7  
    raytrace E` XUK,b  
                DeleteRays e1}h|HL j  
                CreateSource srcnode K,|Gtaa~  
                TraceExisting 'draw h}z^NX  
    !;'U5[}8  
                'radiometry /Rx%}~x/m  
                For k = 0 To GetEntityCount()-1 B HoZ}1_  
                    If IsSurface( k ) Then F]z xx  
                        temp = AuxDataGetData( k, "temperature" ) RX=C)q2c  
                        emiss = AuxDataGetData( k, "emissivity" ) //Hn[wEOh  
                        If ( temp <> 0 And emiss <> 0 ) Then ]![ewO@  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) A7+eWg{  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) TxN#3m?G  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi *ta|,  
                        End If yXppu[=  
    `8xe2=Ub  
                    End If %=S^{A  
    <R*.T)Z1  
                Next k 3r+vpyu  
    m {_\@'q  
            Next j x~j%  
    "] kaaF$U%  
        Next i 'e7<&wm ia  
        EnableTextPrinting( True ) !7AW_l9`i  
    M`Y~IG}  
        'write out file D>?%p"e  
        fullfilepath = CurDir() & "\" & fname UG&/0{j5XV  
        Open fullfilepath For Output As #1 Z\(+awv  
        Print #1, "GRID " & nx & " " & ny f*1.Vg0`-  
        Print #1, "1e+308" bzk@6jR1  
        Print #1, pixelx & " " & pixely -7'>Rw  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 rbO9NRg>  
    9i yNR!  
        maxRow = nx - 1 PM7*@~.  
        maxCol = ny - 1 `Kpn@Xg  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) ud'r ?QDM  
                row = "" p!|Wp  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y)  #XQEfa  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string BGLJ>zkq  
            Next colNum                     ' end loop over columns d=xU f`^  
    -zN*2T  
                Print #1, row I Zi1N  
    e DX{}Dq(  
        Next rowNum                         ' end loop over rows /XS}<!)%  
        Close #1 A$;U*7TJuO  
    FGzB7w#  
        Print "File written: " & fullfilepath <[8at6;  
        Print "All done!!" tL 3]9qfj  
    End Sub _?Rprmjx}  
    5``/exG>  
    在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: Ad9'q!_en  
    #If}P$!  
    flR6^6E  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 \gDf&I  
      
    \P^WUWY  
    XcR2]\  
    打开后,选择二维平面图: !-U5d9!  
    owmV7E1  
     
    分享到