切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 579阅读
    • 0回复

    [技术]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    5734
    光币
    22822
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 .:-*89c  
    0>,i] |Y  
    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
    Xk^<}Ep)c  
    o/U}G,|G  
    背景 ][f0ZMa  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 c3fd6Je5  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ~H ctXe'x  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    x!4<ff.  
    I/h(*~/  
    K/&  
    步骤 *{fZA;<R  
    ]<},[s  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 jJ>I*'w  
    kaZcYuT.9  
    图2. RPC Photonics工程漫射体不同类型的散射数据
     @C'qbO{  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) X?8bb! g%Q  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ^]LWcJ?"^!  
    例如下所示: dDe$<g5L4  
    Sample name:  EDF-C1-56 R<T5lkJ\/  
    Merging data from file EDF-C1-56 0-0.txt B)DtJ f  
    Finished merging RPC data for sample EDF-C1-56 Or1ikI"  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt k DKfJp&a  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NS4W!o;"  
    a. 创建一个新的散射库 5t-(MY  
    b. 散射模型命名 %e: hVU  
    c. 改变散射模型为“Tabulated BSDF”. P\X$fD  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) G!GGT?J  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 o`jVd,aj  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 YZ0Q?7l7  
    g. 点击OK P; =,Q$e8  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 :JxuaM8  
    A*{V%7hs&  
    (S j?BZjC  
    脚本代码 EU7mP MxJ  
    U_0"1+jbq  
    '#Language "WWB-COM" ~RM_c  
    :EC[YAK+D  
    Option Explicit ][Cg8  
    j&?@:Zg v  
    Sub Main w##$SaTI  
    ~<_P jV  
        'Cleanup |A u+^#:;  
        ClearOutputWindow() @}e5T/{X}T  
    L6pw'1'  
        Print "Merging RPC Photonics BSDF Data Files" DTV"~>@  
        SetTextColor(255,0,0) $Jy1=/W&  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." vP&JL~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." \g;-q9g;O  
        SetTextColor(0,0,0) s4\_%je<v  
    ~p/1 9/  
        'Current directory of this script (should be the same as the text files being merged) n ^C"v6X  
        Dim cDir As String pL'+sW  
        cDir = MacroDir$ & "\" [)p>pA2GZj  
    >]8H@. \  
        'Array which will be populated with the list of files to be merged 2G`tS=Un  
        Dim fList() As String, curFile As String [RUYH5>Ik  
        GetFileList( cDir, fList ) *p%=u>?&  
    6SD9lgF*-  
        Print "" @X>Oj.  
        Print "Files found for merging:" =I9RM9O<  
        For Each curFile In fList *1b)Va8v*  
            Print Chr(9) & curFile (f t$ R?  
        Next |lf,3/*jDB  
    ||kUi=5  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. dX~$#-Ad86  
        Dim nameArray() As String, sampName As String ~Wj. 4b*  
        nameArray = Split(fList(0)," 0-0.txt") H(j983  
        sampName  = nameArray(0) V> @+&q  
        Print "" eB*0})  
        Print "Sample name: " & Chr(9) & sampName T|Fl$is  
    f+W %X  
        'Open an output file and write the FRED header data Sy`7})[  
        Dim outFile As String jG&gd<^  
        outFile = cDir & sampName & "_FRED.txt" (\NZ)Ys  
        Open outFile For Output As #1 /jv4# 9  
        Print #1, "type bsdf_data" qUtlh,4)  
        Print #1, "format angles=deg bsdf=value scale=1" a{7'qmN1  
    q*4=sf,>  
        'Loop the file list, skip the two header lines and write the remaining data to file J9*$@&@S  
        Dim lineArray() As String, curLine As Long > hmBV7nR  
        For Each curFile In fList .:=G=v=1  
            Print "Merging data from file " & curFile $Q< >M B7  
            ReadFile( cDir & curFile, lineArray ) _"0Bg3Y  
            For curLine = 2 To UBound(lineArray) <mdHca  
                Print #1, lineArray(curLine) j UCrj'  
            Next 1US4:6xX_  
        Next wm/=]*jpK  
    /V@9!  
        'Close the output file V t@]  
        Close #1 S 7 *LV;  
    m_g2Cep  
        Print "Finished merging RPC data for sample " & sampName tjTnFP/=  
        Print "FRED formatted data file: " & Chr(9) & outFile fC$(l@O?  
    End Sub &`IC 3O5  
    }grel5lq  
    'Utility function to read the contents of a file into an array of strings. 0B?t:XU,  
    Function ReadFile(ByVal fileName As String, _ ;HbAk`\1A  
                      ByRef lineArray() As String) As Long ;X XB^,  
    U}2b{  
        ReadFile = -1 { vOr'j@  
        Dim oFSO As Object Tweku}D7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ruQ1Cph  
        Erase lineArray j!<(`  
    !O }^Y  
        Dim fid As Long w[X/|O  
        If oFSO.fileexists( fileName ) Then %DR8M\d1~H  
            fid = FreeFile() 2/m4|  
            Open fileName For Input As fid #XPY\n^k  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) cg]>*lH  
            Close fid yTb#V"eR  
        End If 6_wj,7  
        Set oFSO = Nothing -\V!f6Q  
        Return UBound( lineArray ) 84}Pu%  
    TKBW2  
    End Function hiQ #<  
    Qaeg3f3F3  
    Sub GetFileList( ByVal in_dir As String, _ 7lH3)9G;  
                     ByRef in_flist() As String ) kMP3PS  
    /pS Y~*  
        'Redimension the file list array e;G}T%W  
        Erase in_flist nqMXE82  
    1rLK1X  
        'Tracks how many files are found |`,AA a  
        Dim fCount As Long +zf[Im%E  
        fCount = 0 iu+r=s p  
    (764-iv(  
        'Recurse directory and search for text files kt;uB X3  
        Dim f As String iVe"iH  
        f = Dir$(in_dir & "*.txt") %ot4$ eY  
        While f <> "" JRYCM}C]  
            ReDim Preserve in_flist(fCount) P")1_!  
            in_flist(fCount) = f o/~Rf1  
            fCount += 1 l1I\khS  
            f = Dir$() [;RO=  
        Wend o;5ns  
        ReDim Preserve in_flist(fCount-1) \\UOpl  
    gql^Inx<  
    End Sub h1AZ+9  
     
    分享到