切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1897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
    6613
    光币
    27214
    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。 y6KI.LWR9  
    y}jX/Ln  
    成像示意图
    3 wVN:g7  
    首先我们建立十字元件命名为Target J-lQPMI,  
    4kO[|~#  
    创建方法: 9OB[ig  
    2Up1 FFRx  
    面1 : 3=9yR* *  
    面型:plane  5#JGNxO  
    材料:Air O~F/pJN`  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box X&._<2  
    |Ia3bV W  
    ;czMsHu0X  
    辅助数据: C)> ])'S  
    首先在第一行输入temperature :300K, <Vp7G%"'W  
    emissivity:0.1; d )|{iUcW  
    F,#)8>O  
    hvu>P {  
    面2 : M-KjRl  
    面型:plane =LJc8@<:f  
    材料:Air gH- e0134%  
    孔径:X=1.5, Y=6,Z=0.075,形状选择Box GW$ (E*4q  
    Y >-|`2Z  
    ^=Rqa \;  
    位置坐标:绕Z轴旋转90度, k))*Sg  
    $NP5Z0v7  
    b7>^w<ki  
    辅助数据: "H>L!v  
    h d1H  
    首先在第一行输入temperature :300K,emissivity: 0.1; j(G}4dib  
    6~\z]LZ  
    ~uRG~,{rH  
    Target 元件距离坐标原点-161mm; 9&5\L  
    TEOV>Tt  
    GP ;c$pC  
    单透镜参数设定:F=100, bend=0, 位置位于坐标原点 0`/PEK{  
    yG58?5\9  
    kNfqdCF{P  
    探测器参数设定: POTW+Zq]  
    Xg.'<.!g0  
    在菜单栏中选择Create/Element Primitive /plane K g&{ ?&  
    l5S (x Q  
    =9n$ at$l@  
    1QM*oj:  
    N)A?*s'v~  
    E!'H,#"P  
    元件半径为20mm*20,mm,距离坐标原点200mm。 aR.1&3fE  
    VP=(",`  
    光源创建: KC o<%  
    BR\% aU$u  
    光源类型选择为任意平面,光源半角设定为15度。 w\=zTHo88  
    i](,s.  
    OxX{[|!`  
    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。 8%JxXtWW`  
    G5Y5_r6Gu  
    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 8WV1OIL  
    1Nx.aji  
    LU4\&fd  
    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。 eA&hiAP/  
    0Mt2Rg}  
    创建分析面: ayyn6a8  
    BQ[1,\>  
    'nI2RX  
    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。 Ld? tVi  
    gs 8w/  
    ]CH@ T9d5V  
    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。 7P9n. [  
    Ken|!rL  
    FRED在探测器上穿过多个像素点迭代来创建热图 RH ow%2D  
    -h*Yd)  
    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。 XEV-D9n  
    将如下的代码放置在树形文件夹 Embedded Scripts, B?-RzWB\3  
    tx&>Eo  
    (w]w 2&Y 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。 !U}A1)  
    nul?5{z@  
    绿色字体为说明文字, C<fWDLwYqV  
    +FQ:Q+  
    '#Language "WWB-COM" 57IrD*{  
    'script for calculating thermal image map _3tHzDSG#  
    'edited rnp 4 november 2005 8+ eZU<\B(  
    _)2.#L  
    'declarations (p`'Okw  
    Dim op As T_OPERATION o^4qY  
    Dim trm As T_TRIMVOLUME >1a- }>r  
    Dim irrad(32,32) As Double 'make consistent with sampling IGT~@);  
    Dim temp As Double rui}a=rs  
    Dim emiss As Double ~w Dmt  
    Dim fname As String, fullfilepath As String 0~A<AF*t  
    I!jSAc{  
    'Option Explicit u1` 8f]qt  
    KoiU\r  
    Sub Main  wxsJB2  
        'USER INPUTS _baqN!N  
        nx = 31 |`s}PcV  
        ny = 31 B+);y  
        numRays = 1000 = Ii@-C  
        minWave = 7    'microns swG^L$r`  
        maxWave = 11   'microns 8_>\A= E  
        sigma = 5.67e-14 'watts/mm^2/deg k^4 K%qunjv  
        fname = "teapotimage.dat" riZFcVsB  
    @iUzRsl  
        Print "" cZ|D!1%  
        Print "THERMAL IMAGE CALCULATION" >?'q P ]  
    `NXyzT`:K  
        detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点  -6~*:zg,  
    0-0 )E&2  
        Print "found detector array at node " & detnode yr&oJYM  
    GWjKZ1p  
        srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 IG`~^-}7lR  
    vIU+ZdBw  
        Print "found differential detector area at node " & srcnode N$pwTyk  
    s7I*=}{g0.  
        GetTrimVolume detnode, trm #lltXqvD?  
        detx = trm.xSemiApe U`FybP2R~  
        dety = trm.ySemiApe "x9xJ  
        area = 4 * detx * dety MP[v 9m@  
        Print "detector array semiaperture dimensions are " & detx & " by " & dety FtM7+>Do.  
        Print "sampling is " & nx & " by " & ny _I~TpH^1K  
    sl6p/\_w  
        'reset differential detector area dimensions to be consistent with sampling Lj*F KP\{  
        pixelx = 2 * detx / nx a[";K,  
        pixely = 2 * dety / ny dr~MyQ  
        SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False J}jK_  
        Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 H!F'I)1  
    r4 +w?=`  
        'reset the source power *^Zt5 zk  
        SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) zIF &ZYP  
        Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" oCy52Bm.!  
    hNDhee`%6  
        'zero out irradiance array C$*`c6R  
        For i = 0 To ny - 1 8S]Mf*~S'  
            For j = 0 To nx - 1 ] |u}P2  
                irrad(i,j) = 0.0 &@dMk4BH<  
            Next j CSr{MF`]e  
        Next i `Z|s p  
    @KOa5-u  
        'main loop ~lDLdUs  
        EnableTextPrinting( False ) yp@mxI@1  
    x ?^c:`.  
        ypos =  dety + pixely / 2 &tWWb`  
        For i = 0 To ny - 1 #cdLg-v  
            xpos = -detx - pixelx / 2 =v:_N.Fh-c  
            ypos = ypos - pixely zNE!m:s  
    ATnD~iACY  
            EnableTextPrinting( True ) ]2h[.qa  
            Print i ^]U2Jd  
            EnableTextPrinting( False ) d[~c-G6  
    J3:P/n&  
    P? 9CBhN  
            For j = 0 To nx - 1 ]VwAHT&je  
    jQb=N%5s  
                xpos = xpos + pixelx 7]nPWz1%*  
    jb7=1OPD_  
                'shift source 5&}icS  
                LockOperationUpdates srcnode, True *r-Bt1  
                GetOperation srcnode, 1, op 5@0c@Q  
                op.val1 = xpos }rO4b>J  
                op.val2 = ypos Bs##3{ylu  
                SetOperation srcnode, 1, op d\)v62P  
                LockOperationUpdates srcnode, False 3\4Cg()  
    E32z(:7M  
    raytrace +Og O<P  
                DeleteRays hA@X;Mh^w  
                CreateSource srcnode _I8-0DnOM  
                TraceExisting 'draw iGhapD  
    L1F){8[  
                'radiometry E_H1X'|qS4  
                For k = 0 To GetEntityCount()-1 SQ.4IWT(hR  
                    If IsSurface( k ) Then ?0?'  
                        temp = AuxDataGetData( k, "temperature" ) c<H4rB  
                        emiss = AuxDataGetData( k, "emissivity" ) I* bjE '  
                        If ( temp <> 0 And emiss <> 0 ) Then 'R'>`?Nh  
                            ProjSolidAngleByPi = GetSurfIncidentPower( k ) \6lXsu;I.X  
                            frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ~(Tz <  
                            irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi {>+$u"*  
                        End If ]-}a{z  
    Fj]S8wI  
                    End If RF;N]A?*  
    'P~*cr ?A  
                Next k #zy%B  
    ] !A;-m  
            Next j :w];N|48s  
    sRMzU  
        Next i P\M+Z A ;  
        EnableTextPrinting( True ) p0tv@8C>  
    .H>Rqikj  
        'write out file K&X'^|en  
        fullfilepath = CurDir() & "\" & fname I}q-J~s  
        Open fullfilepath For Output As #1 - a=yi d  
        Print #1, "GRID " & nx & " " & ny Kz<xuulr  
        Print #1, "1e+308" w1}[lq@  
        Print #1, pixelx & " " & pixely xv*mK1e  
        Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 .Gv~e!a8  
    n-=\n6"P  
        maxRow = nx - 1 +p[~hM6?  
        maxCol = ny - 1 ?k3b\E3  
        For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) ,S5#Kka~a  
                row = "" 1y@-  
            For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) e7qT;  
                row = row & irrad(colNum,rowNum) & " "     ' append column data to row string B@=Yj_s  
            Next colNum                     ' end loop over columns lvN{R{7 >  
    h49Q2`  
                Print #1, row ;CvGIp&y  
    E??%)q  
        Next rowNum                         ' end loop over rows )s8r(.W  
        Close #1 [_0g^(`  
    F9<OKcXH  
        Print "File written: " & fullfilepath wiGwN  
        Print "All done!!" D# $gdjZ  
    End Sub m3WV<Cbz  
    xC{NIOYn'  
    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: =I5XG"",  
    esHiWHAC  
    l<HRD  
    找到Tools工具,点击Open plot files in 3D chart并找到该文件 ~h@tezF  
      
    b1#=q0Zl  
    $"i690  
    打开后,选择二维平面图: K+}Z6_:  
    c]]F`B  
     
    分享到