切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1666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
    6441
    光币
    26350
    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。 d[cqs9=\  
    }ZP;kM$g  
    成像示意图
    nE4?oq  
    首先我们建立十字元件命名为Target PNjZbOmzS  
    st|;] q9?  
    创建方法: >EMsBX  
    -AJ$-y  
    面1 : @|N'V"*MT  
    面型:plane R:Pw@  
    材料:Air Y? 1 3_~ K  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box 2HxT+|~d6  
    |zJxR_)  
    51,RbADB  
    辅助数据: -uE2h[X|  
    首先在第一行输入temperature :300K, *5kQ6#l  
    emissivity:0.1; M9 _G  
    W .B>"u  
    `oDs]90  
    面2 : /b$0).fj@,  
    面型:plane iyj,0T  
    材料:Air qIO<\Y l  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box hI&ugdf  
    3)? v  
    mKsTA;  
    位置坐标:绕Z轴旋转90度, O%w"bEr)N  
    "*ot:;I  
    *%{  
    辅助数据: (%i)A$i6a  
    Qh 3V[br  
    首先在第一行输入temperature :300K,emissivity: 0.1; ` |L l  
    R(i2TAaaU  
    0<,Q7onDD:  
    Target 元件距离坐标原点-161mm; Usa  
    d G}.T_l  
    |GDf<\  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 -T s8y  
    J?Ed^B-  
    Sxj _gn  
    探测器参数设定: `]+-z +  
    B/iRR2h  
    在菜单栏中选择Create/Element Primitive /plane 1X5*V!u  
    0+i\j`O&  
    BIFuQ?j3  
    3Zr'Mn  
    ?r`UBR+[  
    :X?bWxOJ  
    元件半径为20mm*20,mm,距离坐标原点200mm。 `I\)Kk@*b9  
    \Y EV 5  
    光源创建: <@Lw '  
    "Yk3K^`1T.  
    光源类型选择为任意平面,光源半角设定为15度。 !hBzT7CO  
    CL~21aslI  
    A7/ R5p  
    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。 C< :F<[H  
    LC!ZeW35  
    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 z3RlD"F1  
    np>RxiB^  
    l~Em2@c  
    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}$s,j3NO  
    _li\b-  
    创建分析面: E^RPK{zO  
    liYR8D |  
    ;w^-3 U7:  
    到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 zF& >1y.$  
    7c:5 Ey  
    L5"|RI}  
    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。 =<_ei|ME  
    ";)SA,Z  
    FRED在探测器上穿过多个像素点迭代来创建热图 G)I lkA@  
    <2\4eusk  
    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。 ?z:Xdx\l  
    将如下的代码放置在树形文件夹 Embedded Scripts, rCwjy&SuU^  
    ^'g1? F$_  
    X(b"b:j'  
    打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 W|go*+`W%  
    4_#y l9+  
    绿色字体为说明文字, v{R:F  
    [M^ur%H  
    '#Language "WWB-COM" rC(-dJkV  
    'script for calculating thermal image map P5:X7[  
    'edited rnp 4 november 2005 U9om}WKO  
    jY]hMQ/H  
    'declarations WHV]H  
    Dim op As T_OPERATION Hkc:B/6  
    Dim trm As T_TRIMVOLUME g@&@ ]63  
    Dim irrad(32,32) As Double 'make consistent with sampling [@Db7]nG  
    Dim temp As Double N"i'[!H%  
    Dim emiss As Double #-QQ_  
    Dim fname As String, fullfilepath As String ;K'1dsA  
    G1Qc\mp  
    'Option Explicit ;st$TVzkn  
    K1P3 FfG  
    Sub Main ]FJpe^ ua  
        'USER INPUTS AT#&`Ew  
        nx = 31 9w-V +Nf  
        ny = 31 t=`bXBX1  
        numRays = 1000 FyXz(l:  
        minWave = 7    'microns PV2cZ/  
        maxWave = 11   'microns 39W"G7n?v  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 w3^>{2iqq  
        fname = "teapotimage.dat" 7p}.r J54  
    6 u3$ .Q  
        Print "" pg}9baW?  
        Print "THERMAL IMAGE CALCULATION" :v_H;UU  
    6J|Ee1Ez  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 t"0Z=`Wi  
    G<1awi  
        Print "found detector array at node " & detnode 1U"Fk3  
    IC-k  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 yDt3)fP#  
    !MOgM  
        Print "found differential detector area at node " & srcnode ZMSP8(V  
    ToUeXU [  
        GetTrimVolume detnode, trm e ;4y5i  
        detx = trm.xSemiApe +4kBd<0Y  
        dety = trm.ySemiApe ")l_>y ?  
        area = 4 * detx * dety k+^-;=u 6<  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety 09Sy- je*/  
        Print "sampling is " & nx & " by " & ny Rt$Q *`u   
    E(i<3U"4h[  
        'reset differential detector area dimensions to be consistent with sampling =O qw`jw  
        pixelx = 2 * detx / nx '_z#}P<  
        pixely = 2 * dety / ny \ 9T;-]  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False $<)k-Cf  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 HvWnPh1l  
    EJ*  
        'reset the source power .Dw^'p>  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) bg\~"  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" :les 3T}2  
    AiXxn'&i  
        'zero out irradiance array EUv xil  
        For i = 0 To ny - 1 b|i94y(  
            For j = 0 To nx - 1 * \@u,[,  
                irrad(i,j) = 0.0 ^L&hwXAO:  
            Next j /aepE~T  
        Next i w5I +5/I  
    z6tH2Wxf  
        'main loop ,+0>p  
        EnableTextPrinting( False ) N?d4Pu1m  
    < PoRnx  
        ypos =  dety + pixely / 2 *KP 60T  
        For i = 0 To ny - 1 lFT_J?G$'  
            xpos = -detx - pixelx / 2 6x*u S~'  
            ypos = ypos - pixely *g$egipfF  
    :@6,|2b e=  
            EnableTextPrinting( True ) 4Fr0/="H  
            Print i neGCMKtzlJ  
            EnableTextPrinting( False ) $I%75IZ  
    &lYZ=|6  
    x\vb@!BZ  
            For j = 0 To nx - 1 D.2HM  
    gt5  
                xpos = xpos + pixelx o@}+b}R}  
    NGHzifaE   
                'shift source dU]>  
                LockOperationUpdates srcnode, True Z9rs,_A  
                GetOperation srcnode, 1, op CVsc#=w0  
                op.val1 = xpos N@UO8'"9K&  
                op.val2 = ypos ,c:Fa)-  
                SetOperation srcnode, 1, op Aj06"ep  
                LockOperationUpdates srcnode, False *yGOm i  
    pb~&gliW  
    raytrace Yt"&8N]  
                DeleteRays J7R+|GTcx  
                CreateSource srcnode pQaP9Y{OK  
                TraceExisting 'draw ,*fvA?  
    C[$uf  
                'radiometry :('7ly!h  
                For k = 0 To GetEntityCount()-1 \*#9Ry^f  
                    If IsSurface( k ) Then `F:PWG`  
                        temp = AuxDataGetData( k, "temperature" ) {q2H_H  
                        emiss = AuxDataGetData( k, "emissivity" ) ^a@Vn\V1  
                        If ( temp <> 0 And emiss <> 0 ) Then W! FmC$Kc  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) 9k_3=KS3N  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) D/_=rAl1  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 1!. CfQi  
                        End If w$*t.Q*  
    v~:$]a8  
                    End If kW&{0xkGR  
    q2}<n'o+  
                Next k IAbK]kA  
    FJ3Xeo s4|  
            Next j EJYfk?(B  
    {9KG06%+  
        Next i xUE9%qO  
        EnableTextPrinting( True ) Ek'  
    KYY~ YP  
        'write out file Pg%OFhA  
        fullfilepath = CurDir() & "\" & fname 8Z>ZjNG  
        Open fullfilepath For Output As #1 H"8+[.xBh  
        Print #1, "GRID " & nx & " " & ny 4.bL>Y>c  
        Print #1, "1e+308" Y418k  
        Print #1, pixelx & " " & pixely =)C}u6  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 (6p 5 Fo  
    >lqWni  
        maxRow = nx - 1 -\@&^e  
        maxCol = ny - 1 xz YvD{>  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) _Tyj4t0ElV  
                row = "" WF<0QH  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) V ^=o@I  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string 9PEjV$0E2  
            Next colNum                     ' end loop over columns fRJSo%  
    }' `2C$  
                Print #1, row [Dp6q~RM  
    6Gjr8  
        Next rowNum                         ' end loop over rows 0Ha1pqR  
        Close #1 O&]Y.Z9,A  
    u79.`,Ad&  
        Print "File written: " & fullfilepath NG@9 }O  
        Print "All done!!" +u*WUw! %  
    End Sub Dq+rEt  
    |{HtY  
    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: e-f_ #!bW  
    NMY~f (x  
    7,ODh-?ez  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 5B| iBS l  
      
    '.oEyZA;o  
    GOHRBV  
    打开后,选择二维平面图: =x}27f%-Mg  
    >:5/V0;,  
     
    分享到