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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 Fej$`2mRH  
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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 /on p<u  
    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。 1Y_fX  
    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。 u]"R AH  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 &yuerNK  
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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。 ; 1WclQ!(  
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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) Nz8iU@!a  
    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  dbR4%;<  
    例如下所示: H!N,PI?rn  
    Sample name:  EDF-C1-56 ]pb3 Fm{  
    Merging data from file EDF-C1-56 0-0.txt p<YO3@B+  
    Finished merging RPC data for sample EDF-C1-56 'W)x<Iey1  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt YV9%^ZaN7  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >2ct1_  
    a. 创建一个新的散射库 !eW<4jYB  
    b. 散射模型命名 V&G_Bu~  
    c. 改变散射模型为“Tabulated BSDF”. @#p4QEQA  
    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 ) 1FuChd  
    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。 NEvt71k  
    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 *i|hcDk  
    g. 点击OK PO #FtG  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ( %bfNs|  
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    脚本代码 ZyTah\yPM  
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    '#Language "WWB-COM" .Xr_BJ _  
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    Option Explicit 0\/7[nwS  
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    Sub Main TYp{nWwi  
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        'Cleanup sM4N`$Is23  
        ClearOutputWindow() 0pu'K)Rb  
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        Print "Merging RPC Photonics BSDF Data Files" Z|)~2[Roa  
        SetTextColor(255,0,0) oY{*X6:6<  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." =%bc;ZUu  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." nC z[#t  
        SetTextColor(0,0,0) &#WTXTr0=  
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        'Current directory of this script (should be the same as the text files being merged) sbgRl%  
        Dim cDir As String !-: a`Vs+  
        cDir = MacroDir$ & "\" #df Aqg'  
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        'Array which will be populated with the list of files to be merged ]UMwpL&rY  
        Dim fList() As String, curFile As String ;$nK ^  
        GetFileList( cDir, fList ) "~GudK &  
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        Print "" 3>;U||O  
        Print "Files found for merging:"  3o/f#y  
        For Each curFile In fList `toSU>:  
            Print Chr(9) & curFile ;e-iiC]PI  
        Next GSl\n"S]=  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. %$b 5&>q  
        Dim nameArray() As String, sampName As String $ \jly  
        nameArray = Split(fList(0)," 0-0.txt") B3K%V|;z )  
        sampName  = nameArray(0) A1i-QG/6  
        Print "" jJ9|  
        Print "Sample name: " & Chr(9) & sampName |>VHV} 4)<  
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        'Open an output file and write the FRED header data -5.>9+W8I  
        Dim outFile As String |GIT{_JE  
        outFile = cDir & sampName & "_FRED.txt" t#kmtJC  
        Open outFile For Output As #1 7/Ew(X8Fs  
        Print #1, "type bsdf_data" ^c+6?  
        Print #1, "format angles=deg bsdf=value scale=1" [<cP~  
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        'Loop the file list, skip the two header lines and write the remaining data to file >5 Ce/P'R  
        Dim lineArray() As String, curLine As Long GlVq<RG*  
        For Each curFile In fList zS.7O'I<'  
            Print "Merging data from file " & curFile @w@rW }i0  
            ReadFile( cDir & curFile, lineArray ) 75<E0O  
            For curLine = 2 To UBound(lineArray) LM0 TSB?  
                Print #1, lineArray(curLine) .2OP>:9F  
            Next l46O=?usDX  
        Next 28zt.9  
    9n$$D;  
        'Close the output file GMksr%0Pj  
        Close #1 CKj3-rcF(  
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        Print "Finished merging RPC data for sample " & sampName 5PdC4vI*+  
        Print "FRED formatted data file: " & Chr(9) & outFile E|#'u^`yv  
    End Sub Y ||!V  
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    'Utility function to read the contents of a file into an array of strings. l@## Ex9  
    Function ReadFile(ByVal fileName As String, _ 6jom6/F 4  
                      ByRef lineArray() As String) As Long :s*&_y  
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        ReadFile = -1 ~KEnZa0  
        Dim oFSO As Object _)lK.5  
        Set oFSO = CreateObject("Scripting.FileSystemObject") sd Z=3)  
        Erase lineArray df}B:?Ew.  
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        Dim fid As Long $yRbo '-  
        If oFSO.fileexists( fileName ) Then |)1"*`z  
            fid = FreeFile() i9w xP i  
            Open fileName For Input As fid ,X+071.(  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) /ZX8gR5x  
            Close fid JWM/np6  
        End If :y 0'[LV  
        Set oFSO = Nothing Wu%;{y~#}  
        Return UBound( lineArray ) {{:MJ\_"h_  
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    End Function 90M:0SH  
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    Sub GetFileList( ByVal in_dir As String, _ 3)I v8mA  
                     ByRef in_flist() As String ) 1 BVivEG  
    'Zk&AD ~  
        'Redimension the file list array %/s:G)  
        Erase in_flist Ywlym\ [+  
    ai#0ZgO  
        'Tracks how many files are found Z5_MSPm  
        Dim fCount As Long @~/LsYA:  
        fCount = 0 6<FJ`l]U9  
    ;<MHDm D  
        'Recurse directory and search for text files l{vi{9n)  
        Dim f As String =OTwP  
        f = Dir$(in_dir & "*.txt") ^25$=0  
        While f <> "" 4d[:{/+Q  
            ReDim Preserve in_flist(fCount) sLb[ZQ;j  
            in_flist(fCount) = f )";g*4R[  
            fCount += 1 ]'M Ly#9  
            f = Dir$() z$H |8L  
        Wend dLG5yx\js  
        ReDim Preserve in_flist(fCount-1) J1&G1\G|s=  
    '0z@Jevd?  
    End Sub P#"vlNa  
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