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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 'e3y|  
    - c<<A.X  
    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。
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    背景 ZyCAl9{p  
    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。 c/;t.+g  
    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。 M42Zpb].  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 \2_>$:UoV  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。  =e$ #m;  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    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) -B4uK  
    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 <kLY1 EILM  
    例如下所示:  cD0  
    Sample name:  EDF-C1-56 wrqdQ} @(  
    Merging data from file EDF-C1-56 0-0.txt yel>-=Vn  
    Finished merging RPC data for sample EDF-C1-56 sB0+21'R  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt C^n L{ZP,  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^l$(-#'y  
    a. 创建一个新的散射库 + A0@# :B  
    b. 散射模型命名 -mY90]g  
    c. 改变散射模型为“Tabulated BSDF”. f@LUp^Z/v  
    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 ) ^{6Y7T]  
    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。 >=U $s@  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 r0\bi6;s/  
    g. 点击OK /4_}wi\  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ljiq+tT  
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    脚本代码 T{uktIO/  
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    '#Language "WWB-COM" v/m`rc]e  
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    Option Explicit N e^#5T  
    @b>]q$)(}  
    Sub Main ]m4LY.SQ  
    //J:p,AF  
        'Cleanup T&R`s+7  
        ClearOutputWindow() e\yj>tQJg  
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        Print "Merging RPC Photonics BSDF Data Files" Q@$1!9m  
        SetTextColor(255,0,0) ]ei] ) JI  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." >hQR  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." `/HygC6  
        SetTextColor(0,0,0) 20fCWVw}?}  
    W/\7m\ B  
        'Current directory of this script (should be the same as the text files being merged) Qb(CH  
        Dim cDir As String spl*[ d  
        cDir = MacroDir$ & "\" s &.Z;X  
    R=e`QMq  
        'Array which will be populated with the list of files to be merged htF&VeIte  
        Dim fList() As String, curFile As String xDQ$Ui.  
        GetFileList( cDir, fList ) y.O? c &!  
    \]9;c6(  
        Print "" 92SB'T>  
        Print "Files found for merging:" VqbiZOZ@  
        For Each curFile In fList Etl7V  
            Print Chr(9) & curFile s]I],>}RU  
        Next PN'8"8`{  
    }2\"(_  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <5X@r#Lz  
        Dim nameArray() As String, sampName As String -"cN9RF  
        nameArray = Split(fList(0)," 0-0.txt") [ =9R5.)c  
        sampName  = nameArray(0) $< aBawLZO  
        Print "" CD[7h  
        Print "Sample name: " & Chr(9) & sampName ^#=L?e  
    7q\c\qL  
        'Open an output file and write the FRED header data p0tv@8C>  
        Dim outFile As String .H>Rqikj  
        outFile = cDir & sampName & "_FRED.txt" K&X'^|en  
        Open outFile For Output As #1 I}q-J~s  
        Print #1, "type bsdf_data" Gt1Up~\s  
        Print #1, "format angles=deg bsdf=value scale=1" AH7k|6ku<*  
    )a}5\V  
        'Loop the file list, skip the two header lines and write the remaining data to file .U1dcL6  
        Dim lineArray() As String, curLine As Long #>,cc?H-  
        For Each curFile In fList NRl"!FSD;"  
            Print "Merging data from file " & curFile D3K`b4YV  
            ReadFile( cDir & curFile, lineArray ) hD,- !R  
            For curLine = 2 To UBound(lineArray) $?s^HKF~  
                Print #1, lineArray(curLine) [qXpi'q[  
            Next QB.7n&u  
        Next x:bYd\ EJ[  
    C{ti>'"V  
        'Close the output file uqyf3bK  
        Close #1 O-B3@qQ. h  
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        Print "Finished merging RPC data for sample " & sampName OM.^>=  
        Print "FRED formatted data file: " & Chr(9) & outFile #<~f~{x  
    End Sub XgbGC*dQ  
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    'Utility function to read the contents of a file into an array of strings. OMZT\$9yT  
    Function ReadFile(ByVal fileName As String, _ KF'M4P  
                      ByRef lineArray() As String) As Long G !~BA*  
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        ReadFile = -1 HUghl2L.<  
        Dim oFSO As Object Lg?'1dg  
        Set oFSO = CreateObject("Scripting.FileSystemObject") `u}x:f !  
        Erase lineArray Z`*cI   
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        Dim fid As Long (LfVa`<1  
        If oFSO.fileexists( fileName ) Then ZX0c_Mk=  
            fid = FreeFile() m7"f6zSo(  
            Open fileName For Input As fid } -vBRY  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) &8pXkD#A  
            Close fid _R<HC  
        End If 42u\Y_^ID  
        Set oFSO = Nothing IBqY$K+l  
        Return UBound( lineArray ) z(WpOD   
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    End Function bxN;"{>Xz  
    c|R/,/  
    Sub GetFileList( ByVal in_dir As String, _ QdTe!f|  
                     ByRef in_flist() As String ) AAW7@\q.  
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        'Redimension the file list array ["F,|e{y$  
        Erase in_flist W'jXIO  
    E1C_d'  
        'Tracks how many files are found LC{hoq\  
        Dim fCount As Long sV<4^n7  
        fCount = 0 2UF94  
    (HI%C@e9  
        'Recurse directory and search for text files  ~Hs{(7   
        Dim f As String ddP,_.0  
        f = Dir$(in_dir & "*.txt") bw\=F_>L  
        While f <> "" ;N\?]{ L  
            ReDim Preserve in_flist(fCount) PR?clg=z  
            in_flist(fCount) = f ='0!B]<G  
            fCount += 1 _);Kb/  
            f = Dir$() G!8pF  
        Wend kKM%    
        ReDim Preserve in_flist(fCount-1) bY~v0kg  
    yxN!*~BvL  
    End Sub qfu2}qUX~%  
     
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