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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 'Y&yt"cs  
    PD/~@OsxU  
    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 L50`,,WF  
    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。 O%+:fJz6wI  
    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。  vb70~k  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 jf$t  
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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。 [M;P:@  
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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) cAiIbh>c  
    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 1-qQp.Wj  
    例如下所示: Az)P&*2:'`  
    Sample name:  EDF-C1-56 0` S!+d  
    Merging data from file EDF-C1-56 0-0.txt |H@M-  
    Finished merging RPC data for sample EDF-C1-56 aFC3yMKXh  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt =ecv;uu2  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]T*{M  
    a. 创建一个新的散射库 i3Ffk+ |b  
    b. 散射模型命名 {Qhv HV  
    c. 改变散射模型为“Tabulated BSDF”. Z,d/FC#y(  
    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 ) .:lzT"QXI  
    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。 O&O1O> [p1  
    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 Q% dpGI  
    g. 点击OK Ik}*7D  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |MBnRR  
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    脚本代码 c~tkY!c  
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    '#Language "WWB-COM" kQH!`-n:T  
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    Option Explicit t>25IJG  
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    Sub Main Xajjzl\b  
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        'Cleanup ,)QmQ ^/  
        ClearOutputWindow() ]-AT(L >  
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        Print "Merging RPC Photonics BSDF Data Files" fNK~z*  
        SetTextColor(255,0,0) wo_FM `@  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ,:v}gS?Uq  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Us%VB q  
        SetTextColor(0,0,0) >Ek `PVPD  
    pr m  
        'Current directory of this script (should be the same as the text files being merged) bqe;) A7  
        Dim cDir As String vw(};)8  
        cDir = MacroDir$ & "\" JTb<uC  
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        'Array which will be populated with the list of files to be merged Q2NS>[  
        Dim fList() As String, curFile As String =* (d+[_  
        GetFileList( cDir, fList ) w?5b:W,  
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        Print "" s/T5aJR  
        Print "Files found for merging:" Ti'O 2k  
        For Each curFile In fList PNKmI  
            Print Chr(9) & curFile 1/{:}9Z@  
        Next cKxJeM07  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ("TI~  
        Dim nameArray() As String, sampName As String '!Sj]+  
        nameArray = Split(fList(0)," 0-0.txt") `#(4K4]1.  
        sampName  = nameArray(0) &=/.$i-w$  
        Print "" @ J"1 !`  
        Print "Sample name: " & Chr(9) & sampName UtWoSFZ'o!  
    m.$Oo Mu'  
        'Open an output file and write the FRED header data [lnN~#(Y  
        Dim outFile As String $:xUXEi{  
        outFile = cDir & sampName & "_FRED.txt" 6iTDk  
        Open outFile For Output As #1 % ,X(GwX  
        Print #1, "type bsdf_data" N2~z&y8.  
        Print #1, "format angles=deg bsdf=value scale=1" c^=:]^  
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        'Loop the file list, skip the two header lines and write the remaining data to file B02~/9*Y"  
        Dim lineArray() As String, curLine As Long 9S<W~# zz  
        For Each curFile In fList <D 5QlAN  
            Print "Merging data from file " & curFile hrW.TwK  
            ReadFile( cDir & curFile, lineArray ) Zkz:h7GUG-  
            For curLine = 2 To UBound(lineArray) HD`%Ma Yhc  
                Print #1, lineArray(curLine) .6tz ^4  
            Next :*8@Mj Z4  
        Next `hfwZ*s  
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        'Close the output file vw!i)JO8M  
        Close #1 ~f@;.  
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        Print "Finished merging RPC data for sample " & sampName |[: `izW  
        Print "FRED formatted data file: " & Chr(9) & outFile "2;UXX-H  
    End Sub J:Qp(s-N^:  
    :wF(([&4p!  
    'Utility function to read the contents of a file into an array of strings. '1mygplW  
    Function ReadFile(ByVal fileName As String, _ i|=XW6J%  
                      ByRef lineArray() As String) As Long ZWr\v!4  
    sn *s7v:  
        ReadFile = -1 C {'c_wX  
        Dim oFSO As Object +FJ o!~1  
        Set oFSO = CreateObject("Scripting.FileSystemObject") jK{CjfCNz  
        Erase lineArray !",@,$  
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        Dim fid As Long MBg^U<t8  
        If oFSO.fileexists( fileName ) Then +I/P5OGRN  
            fid = FreeFile() [oYe/<3  
            Open fileName For Input As fid w S;(u[W  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) qS7*.E~j|]  
            Close fid sX=!o})0  
        End If crmnh4-  
        Set oFSO = Nothing SC!IQ80H#D  
        Return UBound( lineArray ) 7IvCMb&%R  
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    End Function GRs;-Jt  
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    Sub GetFileList( ByVal in_dir As String, _ E+Gea[c  
                     ByRef in_flist() As String ) {1qEN_ERx  
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        'Redimension the file list array S#""((U$  
        Erase in_flist 5H',Bm4-  
    }??q{B@v  
        'Tracks how many files are found k4`v(au^  
        Dim fCount As Long <fyv^e  
        fCount = 0 =N3~2=g~A  
    `&+ L/  
        'Recurse directory and search for text files P]y5E9 k  
        Dim f As String ,= PDL  
        f = Dir$(in_dir & "*.txt") 'fgDe  
        While f <> ""  %k2zsM  
            ReDim Preserve in_flist(fCount) ,CvU#ab8$  
            in_flist(fCount) = f - Zw"o>  
            fCount += 1 q6,xsO,+  
            f = Dir$() 6Z'zB&hM}  
        Wend @hv9 =v+  
        ReDim Preserve in_flist(fCount-1) |, :(3Ml  
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    End Sub ?Jma^ S  
     
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