切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 812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
    6389
    光币
    26090
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 w_`;Mn%p  
    <w~$S0_  
    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
    M-Vz$D/aed  
    J:uFQWxZ   
    背景 <<qzZ+u  
    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。 ^|h_[>  
    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。 R3_;!/1  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    8%4v6No&*  
    ^o C>,%7  
    *j,noHUT~>  
    步骤 "S{GjOlEDF  
    &=%M("IlD  
    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。 q2B'R   
    ueW/i  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    :SN?t  
    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) \Qnr0t@0  
    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 gP8}d*W%b  
    例如下所示: .u7grC C  
    Sample name:  EDF-C1-56 /;q 3Q#  
    Merging data from file EDF-C1-56 0-0.txt >W/mRv&  
    Finished merging RPC data for sample EDF-C1-56 `3K."/N6c  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9P <1/W!  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 mrsN@(X0  
    a. 创建一个新的散射库 yoq-H+<  
    b. 散射模型命名 eUa:@cA  
    c. 改变散射模型为“Tabulated BSDF”. ~Odclrs  
    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 ) uW}M1kq?+l  
    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。 2" v{  
    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 {Ho_U&<  
    g. 点击OK tQxAZ0B^  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 g(jn /Cx  
    buKkm$@w  
    z:O:g?A  
    脚本代码 c0jTQMe4yl  
    *6_>/!ywI  
    '#Language "WWB-COM" ZW;Re5?DJ  
    Zn|lL0b{q  
    Option Explicit #cD$ DA  
    %AT/g&M&1#  
    Sub Main HuA4eJ(2  
    -DZ5nx  
        'Cleanup 7we='L&R  
        ClearOutputWindow() 8*VQw?{Uee  
    N^[MeG,8  
        Print "Merging RPC Photonics BSDF Data Files" 44^jE{,9  
        SetTextColor(255,0,0) /^si(BuC^*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." bWCtRli}  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." *&_(kq z'1  
        SetTextColor(0,0,0) 7|ACJv6%9  
    *m&'6qsS  
        'Current directory of this script (should be the same as the text files being merged) #cJ1Jj $  
        Dim cDir As String U; #v-'Z  
        cDir = MacroDir$ & "\" :9>U+)%  
    aNICSxDN  
        'Array which will be populated with the list of files to be merged @%MGLR{pH  
        Dim fList() As String, curFile As String L[+4/a!HQ  
        GetFileList( cDir, fList ) uXGAcUx(  
    xf:|lQf  
        Print "" j3?@p5E(  
        Print "Files found for merging:" EUPc+D3  
        For Each curFile In fList a}k5[)et  
            Print Chr(9) & curFile &6\E'bBt  
        Next sw(|EZ7F  
    HErG%v]nw  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. *'@T+$3s  
        Dim nameArray() As String, sampName As String *MCkezW7{  
        nameArray = Split(fList(0)," 0-0.txt") K[-G2  
        sampName  = nameArray(0) `Z@qWB<  
        Print "" 2tp95E`(O  
        Print "Sample name: " & Chr(9) & sampName eN  TKX  
    >/-Bg:  
        'Open an output file and write the FRED header data c5eimA%`  
        Dim outFile As String 2) Q/cH\g  
        outFile = cDir & sampName & "_FRED.txt" x)kp*^/  
        Open outFile For Output As #1 ~MK%^5y?  
        Print #1, "type bsdf_data" KW36nY\7  
        Print #1, "format angles=deg bsdf=value scale=1" -0*z"a9<p8  
    U]E~7C  
        'Loop the file list, skip the two header lines and write the remaining data to file ^{O1+7d[.  
        Dim lineArray() As String, curLine As Long ?j8_j  
        For Each curFile In fList ^"J)^3j<  
            Print "Merging data from file " & curFile N/B-u)?\:  
            ReadFile( cDir & curFile, lineArray ) Cj6$W5I m  
            For curLine = 2 To UBound(lineArray) 5.U|CL  
                Print #1, lineArray(curLine) =kW7|c5Z  
            Next [Al} GM  
        Next `jGG^w3  
    b5%T)hn=  
        'Close the output file jxgs!B>   
        Close #1 R6irL!akAd  
    @w;&:J9m  
        Print "Finished merging RPC data for sample " & sampName 3gs7Xj%N  
        Print "FRED formatted data file: " & Chr(9) & outFile mx0EEU*  
    End Sub to] ~$~Q|>  
    \2 `|eo  
    'Utility function to read the contents of a file into an array of strings. lM%3 ?~?Q&  
    Function ReadFile(ByVal fileName As String, _ ekSSqj9";  
                      ByRef lineArray() As String) As Long H')8p;~{}  
    =i Wn T  
        ReadFile = -1 ;<K#h9#*7  
        Dim oFSO As Object oMb@)7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") WP? AQD  
        Erase lineArray P?`a{sl.  
    =zwn3L8fL  
        Dim fid As Long TDW\n  
        If oFSO.fileexists( fileName ) Then  bR83N  
            fid = FreeFile() ^" UZ.@sq'  
            Open fileName For Input As fid /V E|FTs  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3m/XT"D  
            Close fid Nb/Z+  
        End If z CFXQi  
        Set oFSO = Nothing 67P@YL  
        Return UBound( lineArray ) S,qEKWyLd  
    ;Z-%'5hKM  
    End Function %_ Vj'z~T  
    9at_F'> R  
    Sub GetFileList( ByVal in_dir As String, _ 0{.[#!CSk  
                     ByRef in_flist() As String ) Ou2p^:C(  
    "VQ7Y`,+  
        'Redimension the file list array iiTt{ab\Y  
        Erase in_flist e6I7N?j  
    h9l 6AnbJ  
        'Tracks how many files are found )8JM.:,  
        Dim fCount As Long %v<BE tq  
        fCount = 0 ze#r/j;sw  
    7toDk$jJRg  
        'Recurse directory and search for text files 8@d@T V!n&  
        Dim f As String tE;c>=>t  
        f = Dir$(in_dir & "*.txt") Na$[nv8qh  
        While f <> "" |aS272'  
            ReDim Preserve in_flist(fCount) #b$qtp!,  
            in_flist(fCount) = f lWk/vj<5  
            fCount += 1 Fz@9 @  
            f = Dir$() e4Q2$ Q@b  
        Wend cP >[H:\Xc  
        ReDim Preserve in_flist(fCount-1) CjUYwAy$k  
    s7 3'h  
    End Sub iO{LsG*5Z  
     
    分享到