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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 yTNHM_P  
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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 ZkdSgc')  
    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。 NCYOY  
    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。 fo <nk|i  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 p9!jM\(  
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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。 oW>e.}d!  
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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) dKevhm)R"  
    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 P057]cAat<  
    例如下所示: wzcv[C-x  
    Sample name:  EDF-C1-56 u Tdz$Nh  
    Merging data from file EDF-C1-56 0-0.txt -zZb]8\E  
    Finished merging RPC data for sample EDF-C1-56 z~i>GN_  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt cV7a, *  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 tVNFulcz$  
    a. 创建一个新的散射库 vrh2}biCR  
    b. 散射模型命名 ~wcp&D  
    c. 改变散射模型为“Tabulated BSDF”. kX*.BZI}C  
    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 ) )EcfEym.>  
    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。 _s:5)  
    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 WopA7J,  
    g. 点击OK }h|HT  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8M]QDgd.  
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    脚本代码 qZlL6  
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    '#Language "WWB-COM" DD6K[\  
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    Option Explicit \_)mWK,h  
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    Sub Main n<eK\ w  
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        'Cleanup er@.<Dc  
        ClearOutputWindow() <d[GGkY]=  
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        Print "Merging RPC Photonics BSDF Data Files" &x@N5j5Q  
        SetTextColor(255,0,0) <! *O[0s  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." P` Gb }]rW  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." KB{/L5  
        SetTextColor(0,0,0) Z5*O\kJv  
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        'Current directory of this script (should be the same as the text files being merged) {>Qs+]  
        Dim cDir As String f J%A_N}  
        cDir = MacroDir$ & "\" Qe]&  
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        'Array which will be populated with the list of files to be merged }!WuJz"  
        Dim fList() As String, curFile As String X1Kze  
        GetFileList( cDir, fList ) I@1VX5  
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        Print "" #qEUGD`  
        Print "Files found for merging:" Nig)!4CG  
        For Each curFile In fList Lp+?5DjLT  
            Print Chr(9) & curFile ph3dm\U.  
        Next JP]-a!5Ru  
    #-PUm0|  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -(E-yC u  
        Dim nameArray() As String, sampName As String #BI6+rfv|  
        nameArray = Split(fList(0)," 0-0.txt") {!pYQ|#  
        sampName  = nameArray(0) Wa iM\h?=#  
        Print "" (cp$poo  
        Print "Sample name: " & Chr(9) & sampName .]; `  
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        'Open an output file and write the FRED header data Qs 'dwc  
        Dim outFile As String U.ew6`'Te  
        outFile = cDir & sampName & "_FRED.txt" Nu><r  
        Open outFile For Output As #1 K48 QkZ_gY  
        Print #1, "type bsdf_data" x`K"1E{2  
        Print #1, "format angles=deg bsdf=value scale=1" `CG% Y>+  
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        'Loop the file list, skip the two header lines and write the remaining data to file z~jk_|?|?  
        Dim lineArray() As String, curLine As Long TezwcFqH  
        For Each curFile In fList F&OcI.OTXF  
            Print "Merging data from file " & curFile WwLV^m]  
            ReadFile( cDir & curFile, lineArray ) I$f'BAw  
            For curLine = 2 To UBound(lineArray) ?cD_\~  
                Print #1, lineArray(curLine) g7K<"Z {M  
            Next J^mm"2  
        Next Lnl-han%  
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        'Close the output file ASr3P5/  
        Close #1 a*o k*r  
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        Print "Finished merging RPC data for sample " & sampName XE;aJ'kt  
        Print "FRED formatted data file: " & Chr(9) & outFile l, -q:8  
    End Sub ::Pf\Lb>  
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    'Utility function to read the contents of a file into an array of strings. 9YwS"~Q =w  
    Function ReadFile(ByVal fileName As String, _ 6/|"y  
                      ByRef lineArray() As String) As Long T{Yk/Z/}?  
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        ReadFile = -1 r m dG"s  
        Dim oFSO As Object eie u|_  
        Set oFSO = CreateObject("Scripting.FileSystemObject") l i2/"~l  
        Erase lineArray tsf !Q  
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        Dim fid As Long zi,":KDz#  
        If oFSO.fileexists( fileName ) Then {G _|gs  
            fid = FreeFile() Jv D`RUh  
            Open fileName For Input As fid \6,Z<.I  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) %&4\'lE  
            Close fid t\lx*_lr  
        End If HjX)5@"o(  
        Set oFSO = Nothing o%v,6yv  
        Return UBound( lineArray ) D o!]t7Y$  
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    End Function @C5 %`{\  
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    Sub GetFileList( ByVal in_dir As String, _ Wu693<  
                     ByRef in_flist() As String ) SSr2K  
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        'Redimension the file list array ` aaT #r  
        Erase in_flist A Zv| |8p  
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        'Tracks how many files are found H=5#cPI#(^  
        Dim fCount As Long :']O4v#^  
        fCount = 0 f2{qj5 K  
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        'Recurse directory and search for text files r A9Rz^;xa  
        Dim f As String $ dHD  
        f = Dir$(in_dir & "*.txt") %(kf#[zQ  
        While f <> "" 'a enh j  
            ReDim Preserve in_flist(fCount) A*3R@G*h  
            in_flist(fCount) = f < nyk:E  
            fCount += 1 H3q L&xL  
            f = Dir$() iTeFy -Ct  
        Wend "yxBD 7  
        ReDim Preserve in_flist(fCount-1) 8R.`*  
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    End Sub s B!2't  
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