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    [分享]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: 2020-12-15
    摘要 @x9a?L.48  
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    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 RSr %n1  
    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。 stG~AC  
    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。 _9faBrzd  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 /d0K7F  
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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。 d{rQzia"mV  
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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) A:>01ZJ5S+  
    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 kv8Fko  
    例如下所示: 4A@NxihH  
    Sample name:  EDF-C1-56 So{x]x:f  
    Merging data from file EDF-C1-56 0-0.txt m*ISa(#(,  
    Finished merging RPC data for sample EDF-C1-56 >C7r:%  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @_U;9)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 @'YS1N<  
    a. 创建一个新的散射库 n/DP>U$I&  
    b. 散射模型命名 m/v9!'cMI  
    c. 改变散射模型为“Tabulated BSDF”. eKgisY4#  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) / rg*p  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 if}-_E<F  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 SLO%7%>p  
    g. 点击OK q:l>O5  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )_1zRT|9  
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    脚本代码 L~_9_9c  
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    '#Language "WWB-COM" cS>e?  
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    Option Explicit n_$ :7J  
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    Sub Main 'I_Qb$  
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        'Cleanup z."a.>fPaO  
        ClearOutputWindow() 6Pnk5ps }h  
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        Print "Merging RPC Photonics BSDF Data Files" LAVAFlK5  
        SetTextColor(255,0,0) wm]^3q I2  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." W`K7 QWV4  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." #~SP)Ukp  
        SetTextColor(0,0,0) ${+ @gJ+S  
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        'Current directory of this script (should be the same as the text files being merged) Xua+cVc\y  
        Dim cDir As String ^ s1Q*He  
        cDir = MacroDir$ & "\" TftHwe):V  
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        'Array which will be populated with the list of files to be merged K/A*<<r ~  
        Dim fList() As String, curFile As String $}lbT15a  
        GetFileList( cDir, fList ) N5*u]j  
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        Print "" C3< m7h  
        Print "Files found for merging:" fNb`X  
        For Each curFile In fList R16'?,  
            Print Chr(9) & curFile hc~s"Atck  
        Next CF+_/s#j^  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )_mr! z(S  
        Dim nameArray() As String, sampName As String ,stN  
        nameArray = Split(fList(0)," 0-0.txt") )E6;-rD0^+  
        sampName  = nameArray(0) B+[A]dgS  
        Print "" \zieyE  
        Print "Sample name: " & Chr(9) & sampName RRmLd/(  
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        'Open an output file and write the FRED header data L!=4N!j  
        Dim outFile As String QA2borfy  
        outFile = cDir & sampName & "_FRED.txt" Sl-v W  
        Open outFile For Output As #1 '&.#  
        Print #1, "type bsdf_data" ._8KsuJG  
        Print #1, "format angles=deg bsdf=value scale=1" 0TN;86Mo  
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        'Loop the file list, skip the two header lines and write the remaining data to file '3TW [!m  
        Dim lineArray() As String, curLine As Long Swp;HW7x  
        For Each curFile In fList 6T+FH;h  
            Print "Merging data from file " & curFile 'a$Gv&fu  
            ReadFile( cDir & curFile, lineArray ) e?_@aa9~@{  
            For curLine = 2 To UBound(lineArray) .u:81I=w(  
                Print #1, lineArray(curLine) "`M?R;DH  
            Next :!5IW?2  
        Next M&N B/  
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        'Close the output file ?shIj;c[  
        Close #1 w=j  
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        Print "Finished merging RPC data for sample " & sampName _@ *+~9%8p  
        Print "FRED formatted data file: " & Chr(9) & outFile ;3\3q1oX  
    End Sub u}!@ ,/)  
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    'Utility function to read the contents of a file into an array of strings. ##@$|6  
    Function ReadFile(ByVal fileName As String, _ COTp  
                      ByRef lineArray() As String) As Long y]J89  
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        ReadFile = -1 K$M^gh0  
        Dim oFSO As Object kqce[hgs<  
        Set oFSO = CreateObject("Scripting.FileSystemObject") qHNE8\9  
        Erase lineArray w"OP8KA:^T  
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        Dim fid As Long e*bH0';q  
        If oFSO.fileexists( fileName ) Then Kw8u`$Ad7  
            fid = FreeFile() Vs%|pIV  
            Open fileName For Input As fid fO0(Z  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q3|T':l4  
            Close fid }?z@rt^  
        End If qZ}P*+`Q  
        Set oFSO = Nothing Gm9hYhC8  
        Return UBound( lineArray ) 1Ab>4UhD  
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    End Function -RS7h  
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    Sub GetFileList( ByVal in_dir As String, _ z)z{3rR|PW  
                     ByRef in_flist() As String ) 5B&;uY  
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        'Redimension the file list array :um|nRwy9  
        Erase in_flist rS4@1`/R  
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        'Tracks how many files are found wjh=Q  
        Dim fCount As Long >. '<J]  
        fCount = 0 Qu} W/j|3  
    &}?$i7x5  
        'Recurse directory and search for text files 2gzou|Y  
        Dim f As String M/):e$S  
        f = Dir$(in_dir & "*.txt") ep=qf/vd<  
        While f <> "" 34wkzu  
            ReDim Preserve in_flist(fCount) ={5#fgK>  
            in_flist(fCount) = f rAs,X  
            fCount += 1 ;=<-5;rI  
            f = Dir$() UTf9S>HS  
        Wend "Kc>dJ@W  
        ReDim Preserve in_flist(fCount-1) RjWqGr;bO  
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    End Sub es>W$QKlo  
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