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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: 07-22
    摘要 ;OfZEy>7  
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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 JLH,:2  
    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。 j9/Ev]im|F  
    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。 mY !LGN  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Qv>rww]  
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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。 f6zS_y9gn  
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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) m5rJY/  
    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 J}J7A5P  
    例如下所示: nH % 1lD?:  
    Sample name:  EDF-C1-56 Du."O]syD  
    Merging data from file EDF-C1-56 0-0.txt 8'6$t@oT9w  
    Finished merging RPC data for sample EDF-C1-56 ccu13Kr>E  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7f\@3r  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N"wp2w  
    a. 创建一个新的散射库 %:WM]dc  
    b. 散射模型命名 ;_hL  
    c. 改变散射模型为“Tabulated BSDF”. I~.d/!>Z  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) nlkQ'XGAI  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 &\/b(|>  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 du k:: |{F  
    g. 点击OK uepL"%.@7|  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @Xb>GPVe#L  
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    脚本代码 1_z6O!rx  
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    '#Language "WWB-COM" *b >hZkObn  
    'N?t=A  
    Option Explicit GxR, 3  
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    Sub Main @lnM%  
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        'Cleanup c&JYbq  
        ClearOutputWindow() wuQ>|\Zs  
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        Print "Merging RPC Photonics BSDF Data Files" s"solPw  
        SetTextColor(255,0,0) ) "o+wSI1  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." qm&Z_6Pw  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." q T pvz  
        SetTextColor(0,0,0) 4fCg{  
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        'Current directory of this script (should be the same as the text files being merged) XN=Cq*3}  
        Dim cDir As String X;?Z_3I:5  
        cDir = MacroDir$ & "\"  j{;RuNt  
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        'Array which will be populated with the list of files to be merged Iu -CXc  
        Dim fList() As String, curFile As String ?$T39U^  
        GetFileList( cDir, fList ) khW9n*  
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        Print "" Fc"&lk4e  
        Print "Files found for merging:" F}lgy;=h  
        For Each curFile In fList ]U,K]y[Bj  
            Print Chr(9) & curFile l^IPN 'O@  
        Next XI*_ti  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. l?/.uNw  
        Dim nameArray() As String, sampName As String ,OQ!lI_`R  
        nameArray = Split(fList(0)," 0-0.txt") ~',}]_'oR-  
        sampName  = nameArray(0) |=frsf~?  
        Print "" B !(t<W8cu  
        Print "Sample name: " & Chr(9) & sampName ;^,2 QsM  
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        'Open an output file and write the FRED header data 4#qjRmt  
        Dim outFile As String w$5N6  
        outFile = cDir & sampName & "_FRED.txt" (&6C,O~n^.  
        Open outFile For Output As #1 $nOd4{s_  
        Print #1, "type bsdf_data" Hh bf9)  
        Print #1, "format angles=deg bsdf=value scale=1" x\Y%/C[Kc  
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        'Loop the file list, skip the two header lines and write the remaining data to file .=>T yq  
        Dim lineArray() As String, curLine As Long `FImi9%F  
        For Each curFile In fList I>27U<PX  
            Print "Merging data from file " & curFile sX&M+'h  
            ReadFile( cDir & curFile, lineArray ) NS l$5E  
            For curLine = 2 To UBound(lineArray) [LonY49  
                Print #1, lineArray(curLine) :8_`T$8i4  
            Next sQA{[l!aj  
        Next c#G]3vTdE  
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        'Close the output file 3_atv'I  
        Close #1 (/_Q r2KfC  
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        Print "Finished merging RPC data for sample " & sampName FGOa! G  
        Print "FRED formatted data file: " & Chr(9) & outFile vII8>x%*  
    End Sub 0NSn5Hq  
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    'Utility function to read the contents of a file into an array of strings. ~^.&nph  
    Function ReadFile(ByVal fileName As String, _ v.1= TBh  
                      ByRef lineArray() As String) As Long >:]fN61#  
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        ReadFile = -1 6QRfju'  
        Dim oFSO As Object ~MY (6P  
        Set oFSO = CreateObject("Scripting.FileSystemObject") mm=Y(G[_%y  
        Erase lineArray Xl6)&   
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        Dim fid As Long -aNTFt~|[  
        If oFSO.fileexists( fileName ) Then $ Yz &x%Lb  
            fid = FreeFile() =tcPYYD  
            Open fileName For Input As fid  ZW2#'$b  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) b,a\`%m}  
            Close fid ZZC= 7FB  
        End If 4C /8hsn  
        Set oFSO = Nothing ^BM/K&7^  
        Return UBound( lineArray ) +29;T0>a  
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    End Function Jb-wvNJu  
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    Sub GetFileList( ByVal in_dir As String, _ L1QQU  
                     ByRef in_flist() As String ) l1cBY{3QD  
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        'Redimension the file list array fnnwe2aso  
        Erase in_flist =zA=D.D2  
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        'Tracks how many files are found ~+7yi4(i  
        Dim fCount As Long 29ft!R>[  
        fCount = 0 o33{tUp'  
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        'Recurse directory and search for text files wH Z!t,g  
        Dim f As String `A <yDy  
        f = Dir$(in_dir & "*.txt") lO $M6l  
        While f <> "" G P1>h.J  
            ReDim Preserve in_flist(fCount) H[N&Wiq/|  
            in_flist(fCount) = f )Q xv9:X  
            fCount += 1 Y)u} +Yg  
            f = Dir$() ^RWt  
        Wend !v;r3*#Nky  
        ReDim Preserve in_flist(fCount-1) h.=B!wKK  
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    End Sub 9jPb-I-   
     
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