切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1800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
    6553
    光币
    26914
    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。 C[Ap&S  
    *u i!|;  
    成像示意图
    gyz#:z$p^  
    首先我们建立十字元件命名为Target r}-si^fo;  
    X#|B*t34  
    创建方法: *Va;ra(V2  
    _\d[`7#  
    面1 : vG{+}o#  
    面型:plane eNwF<0}  
    材料:Air G`_LD+  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box /f5*KRM  
    bp>-{Nv  
    ;77#$H8)  
    辅助数据: rF3QmR?l  
    首先在第一行输入temperature :300K,  rk F>c  
    emissivity:0.1; YT*_ vmJV  
    &zxqVI$4  
    ko2T9NI:S  
    面2 : 5a`f % h%  
    面型:plane PQkFzyk  
    材料:Air |2$wJ$ I  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box o4%H/|Oq.  
    a'[Ah2}3r<  
    <Va7XX%>  
    位置坐标:绕Z轴旋转90度, F1Jd-3ei  
    rwJCVkF  
    P?#I9y7iP  
    辅助数据: hyHeyDO2  
    <WHu</  
    首先在第一行输入temperature :300K,emissivity: 0.1; %OIJ.  
    SH009@l_8  
    TbUouoc  
    Target 元件距离坐标原点-161mm; Q1b<=,  
    QGR}`n2D  
    u . xUM  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 !a.|URa7  
    :aIS>6  
    RjcU0$Hi  
    探测器参数设定: u/I|<NAC,  
    ccdP}|9e  
    在菜单栏中选择Create/Element Primitive /plane sU|\? pJ  
    =ObI  
    a_GnN\kX^Z  
    Z8Jrt3l{2  
    U '$W$()p  
    @(m+B\  
    元件半径为20mm*20,mm,距离坐标原点200mm。 `X:o]t@  
    K&\ q6bU  
    光源创建: .Wr%l $~  
    b-`=^ny)K  
    光源类型选择为任意平面,光源半角设定为15度。 }Ai_peO0a  
    =o!1}'1}}  
    7K5D,"D;1  
    我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 -lb,0   
    j& H4L  
    我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线 -J06H&/k  
    Bh#?:h&f  
    xpO'.xEs  
    功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 {\-9^RL  
    YV{^2)^  
    创建分析面: SyB2A\A  
    }%T8?d]  
    ]SO-NR  
    到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 _,ki/7{  
    w YEkWB^  
    oy _DYop  
    到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 pz hPEp;  
    qdOUvf  
    FRED在探测器上穿过多个像素点迭代来创建热图 \U?$ r[P  
    r'bPSu,  
    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。 OpNxd]"T  
    将如下的代码放置在树形文件夹 Embedded Scripts, zUIh^hbFf  
    Z)7|m  
    !bq3c(d  
    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。 s2X<b `  
    G2[? b2)8  
    绿色字体为说明文字, g0Ff$-#7  
    Fcz}Gs4  
    '#Language "WWB-COM" $!ATj`}kb  
    'script for calculating thermal image map . XVW2ISv  
    'edited rnp 4 november 2005 +NT8dd  
    )&") J}@  
    'declarations k vQ] }`a  
    Dim op As T_OPERATION YaT6vSz  
    Dim trm As T_TRIMVOLUME %0gcNk"=  
    Dim irrad(32,32) As Double 'make consistent with sampling #$^vP/"$  
    Dim temp As Double &Rp/y%9  
    Dim emiss As Double }<9IH%sgF  
    Dim fname As String, fullfilepath As String 0DB8[#i%:  
    \,ko'4 8@  
    'Option Explicit Bs!F |x(  
    9sI&&Jg  
    Sub Main ,8`CsY^1  
        'USER INPUTS &<>NP?j}  
        nx = 31 nkxv,_)ZT  
        ny = 31 JnY.]:  
        numRays = 1000 L>>RboR}  
        minWave = 7    'microns ;_oJGII?br  
        maxWave = 11   'microns 0|=,!sY  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 y(fJ{k   
        fname = "teapotimage.dat" *I6W6y;E=  
    !LX)  
        Print "" t8?$q})RL  
        Print "THERMAL IMAGE CALCULATION" }I3m8A  
    q(9S4F   
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Q&@e,7]V+  
    !XqU'xxC  
        Print "found detector array at node " & detnode ?lPyapA]  
    B'D\l\w  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 _wp_y-"  
    B4M rrW4=  
        Print "found differential detector area at node " & srcnode U^&,xz$Cg  
    7@NV|Idtd  
        GetTrimVolume detnode, trm '5r\o8RjN  
        detx = trm.xSemiApe M?ObK#l!_  
        dety = trm.ySemiApe t[4V1:  
        area = 4 * detx * dety Ef]<0Tm]:  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety v1VH&~e  
        Print "sampling is " & nx & " by " & ny 'o]kOp@q  
    Iy#=Nq=  
        'reset differential detector area dimensions to be consistent with sampling O\+b1+&b3Y  
        pixelx = 2 * detx / nx M/J?$j  
        pixely = 2 * dety / ny fW z=bJ"V  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False pdySip<  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 R^?9 V=Y<T  
    oiTSpd-  
        'reset the source power BA6(Owb  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) |r+w(TG  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" WS6;ad;|  
    vs%d}]v  
        'zero out irradiance array :LxsiDrF[  
        For i = 0 To ny - 1 ;u*I#)7  
            For j = 0 To nx - 1 \&MJ(F>vJ  
                irrad(i,j) = 0.0 qHl>d*IZ  
            Next j E;rS"'D:  
        Next i X#<+D1P  
    ufn% sA  
        'main loop ' +f(9/  
        EnableTextPrinting( False ) AaLbJYuKd  
    ZKTY1JW_  
        ypos =  dety + pixely / 2 [:gp_Z&  
        For i = 0 To ny - 1 >K!$@]2F  
            xpos = -detx - pixelx / 2 | r,{#EE  
            ypos = ypos - pixely `rest_vu  
    _A~>?gJ;,  
            EnableTextPrinting( True ) O<P(UT"  
            Print i _-|+k  
            EnableTextPrinting( False ) x8o/m$[,=u  
    /d*[za'0  
    )8`i%2i=  
            For j = 0 To nx - 1 MG,)|XpyWJ  
    ]YrgkC35  
                xpos = xpos + pixelx (_3QZ  
    mEg3.|  
                'shift source U'LPaf$O  
                LockOperationUpdates srcnode, True :{s0tw>Z  
                GetOperation srcnode, 1, op }z F,dst  
                op.val1 = xpos b#( X+I  
                op.val2 = ypos D]twid~OS  
                SetOperation srcnode, 1, op &EhOSu  
                LockOperationUpdates srcnode, False {8"Uxj_6V  
    "$.B@[iY@  
    raytrace CI1K:K AM  
                DeleteRays pv,z$3Q  
                CreateSource srcnode K SJ Ko  
                TraceExisting 'draw -_M':  
    fRjp(m  
                'radiometry >mj WC) U  
                For k = 0 To GetEntityCount()-1 #sE: xIR  
                    If IsSurface( k ) Then y9U~4  
                        temp = AuxDataGetData( k, "temperature" ) `$MO;Fv,G  
                        emiss = AuxDataGetData( k, "emissivity" ) :W#?U yo  
                        If ( temp <> 0 And emiss <> 0 ) Then SmUiH9qNd,  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) 6a704l%#hb  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) b%].D(qBy  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi N%S|Ey@f   
                        End If {^?:-#~h  
    >FS}{O2c  
                    End If @<yYMo7  
    Te`MIR  
                Next k uNca@xl'  
    `{NbMc\ ]  
            Next j ( 6ucA  
     i (`Q{l  
        Next i p }e| E!  
        EnableTextPrinting( True ) ,n`S ,  
    n5y0$S/ D  
        'write out file ,<$rSvMfg  
        fullfilepath = CurDir() & "\" & fname h!`KX2~  
        Open fullfilepath For Output As #1 P('bnDU  
        Print #1, "GRID " & nx & " " & ny nG$+9}\UlP  
        Print #1, "1e+308" p!EG:B4  
        Print #1, pixelx & " " & pixely ';m;K (g  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 :kC*<f\  
    2Vs+8/  
        maxRow = nx - 1 ,u9 >c*Ss\  
        maxCol = ny - 1 ZAgtVbO7  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 8gG;A8  
                row = "" = toU?:.  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) lQv (5hIm  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string bAld'z#  
            Next colNum                     ' end loop over columns j Y(|z*|  
    7=s7dYlu  
                Print #1, row 8@ f+?g*i  
    -XnOj2  
        Next rowNum                         ' end loop over rows nUK;M[  
        Close #1 %~M#3Ywa  
    'wWuR@e#&  
        Print "File written: " & fullfilepath ^a$L9p(  
        Print "All done!!" Y?-Ef sK  
    End Sub PAH#yM2Ic  
    O)"Z%B  
    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: )$K\:w>  
    tBETNt7  
    4y!GFhMh  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 ?J-D6;  
      
    1~E;@eK'  
    :(4q\~  
    打开后,选择二维平面图: .*Bd'\:F/q  
    _w2KUvG-8  
     
    分享到