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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 =h5&:?X  
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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 O?\UPNb:K  
    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。 [bM$n m  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 eb1WTK@  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ^4MRG6G  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 j IO2uTM~  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Rhi`4wo0$  
    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 'O>p@BEK  
    例如下所示: gn82_  
    Sample name:  EDF-C1-56 @M( hyS&on  
    Merging data from file EDF-C1-56 0-0.txt ul(pp+%S  
    Finished merging RPC data for sample EDF-C1-56 ZkWX4?&OMt  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `r#]dT[g  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 m[aBHA^g  
    a. 创建一个新的散射库 -Cn x!g}  
    b. 散射模型命名 C2e.RTxc  
    c. 改变散射模型为“Tabulated BSDF”. j(aok5:e  
    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 ) QC\r|RXW  
    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。 7QSr C/e  
    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{nrOb1G(  
    g. 点击OK .)(5F45Wg  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \d-H+t]  
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    脚本代码 V2B@Lq"9`  
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    '#Language "WWB-COM" 0*J},#ba$  
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    Option Explicit 3A&: c/  
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    Sub Main N1D{ %  
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        'Cleanup "udA-;!@&  
        ClearOutputWindow() Dpb prT7_  
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        Print "Merging RPC Photonics BSDF Data Files" 3g79/ w  
        SetTextColor(255,0,0) "J(T?|t  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 8*x/NaH /\  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." to9X2^  
        SetTextColor(0,0,0) }Y~<|vZ  
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        'Current directory of this script (should be the same as the text files being merged) Cl>|*h+m  
        Dim cDir As String q2+`a;_S  
        cDir = MacroDir$ & "\" sgLw,WZ:  
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        'Array which will be populated with the list of files to be merged ptQCqQ1_d  
        Dim fList() As String, curFile As String ^\ku}X_ [?  
        GetFileList( cDir, fList ) >,6%Y3  
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        Print "" Mni@@W  
        Print "Files found for merging:" >PS`;S!(  
        For Each curFile In fList 2F&VG|"  
            Print Chr(9) & curFile <dWms`Qc O  
        Next )+ (GE  
    % <1&\5f<5  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. w~AW( VX  
        Dim nameArray() As String, sampName As String B<{Yj}..  
        nameArray = Split(fList(0)," 0-0.txt") Oh=E!  
        sampName  = nameArray(0) Mp`!zwR  
        Print "" Ud:;kI%Vj  
        Print "Sample name: " & Chr(9) & sampName wbQs>pc  
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        'Open an output file and write the FRED header data  (z.4er}o  
        Dim outFile As String jdf3XTw  
        outFile = cDir & sampName & "_FRED.txt" GHR r+  
        Open outFile For Output As #1 ^Lc, w  
        Print #1, "type bsdf_data" e3.q8r  
        Print #1, "format angles=deg bsdf=value scale=1" &{e:6t  
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        'Loop the file list, skip the two header lines and write the remaining data to file .+A2\F.^  
        Dim lineArray() As String, curLine As Long  myOdf'=  
        For Each curFile In fList yPoa04!{=  
            Print "Merging data from file " & curFile F\2<q$Zn+  
            ReadFile( cDir & curFile, lineArray ) kXN8hU}iq  
            For curLine = 2 To UBound(lineArray) OrY^?E  
                Print #1, lineArray(curLine) o`M.v[O  
            Next miUjpXt  
        Next cqG&n0zb  
    /k.?x]Ab  
        'Close the output file x/L(0z  
        Close #1 T@R2H&L  
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        Print "Finished merging RPC data for sample " & sampName z3p TdUt  
        Print "FRED formatted data file: " & Chr(9) & outFile lobC G  
    End Sub MLvd6tIv,  
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    'Utility function to read the contents of a file into an array of strings. $O^"O Q_@  
    Function ReadFile(ByVal fileName As String, _ 5 \iX%w@  
                      ByRef lineArray() As String) As Long ('6sW/F*ab  
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        ReadFile = -1 J-ErG!  
        Dim oFSO As Object 2O(= 2X  
        Set oFSO = CreateObject("Scripting.FileSystemObject") @MxB d,P  
        Erase lineArray ,zOv-pH  
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        Dim fid As Long FO:k >F  
        If oFSO.fileexists( fileName ) Then .cK<jF@'  
            fid = FreeFile() /s Bs eI  
            Open fileName For Input As fid ]$)U~)T iW  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) glomwny  
            Close fid :Izdj*HL;A  
        End If 5}4>vEn  
        Set oFSO = Nothing TJ>$ ~9&Sy  
        Return UBound( lineArray ) AGV+Y 6  
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    End Function xM_+vN *(  
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    Sub GetFileList( ByVal in_dir As String, _ h3Y|0-D  
                     ByRef in_flist() As String ) MI,kKi  
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        'Redimension the file list array <"Yx}5n.  
        Erase in_flist rnP *}  
    ' 1D1y'  
        'Tracks how many files are found W3A9uk6  
        Dim fCount As Long r:5u(2  
        fCount = 0 Yu: !l>  
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        'Recurse directory and search for text files 2h#_n'DV  
        Dim f As String [!YSW'  
        f = Dir$(in_dir & "*.txt") (%)<jg1  
        While f <> "" j[|mC;y.  
            ReDim Preserve in_flist(fCount) zRFvWOxC\  
            in_flist(fCount) = f z4rg.ai  
            fCount += 1 ;uaZp.<um&  
            f = Dir$() zh Vkn]z~*  
        Wend i\C~]K~O!  
        ReDim Preserve in_flist(fCount-1) .&rL>A2U  
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    End Sub "]hQ\b\O  
     
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