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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 HGm 3+,  
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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 XGP6L0j  
    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。 =FE|+!>PA  
    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。 :'#TCDlOb  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 aW>6NDq(  
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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。 ;&1V0U,fx  
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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) iD<(b`S  
    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 ^]{R.(#z  
    例如下所示: k0T?-iM  
    Sample name:  EDF-C1-56 =[F<7pvE  
    Merging data from file EDF-C1-56 0-0.txt V<Z[ nq  
    Finished merging RPC data for sample EDF-C1-56 rn<PR*  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt =Zi2jL?On  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 gx%|Pgd  
    a. 创建一个新的散射库 fk_o@ G!0  
    b. 散射模型命名 g!-,]  
    c. 改变散射模型为“Tabulated BSDF”. ,3@#F/c3i~  
    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 ) e^.Fa59  
    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。 =i~}84>  
    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 NH+(?TN  
    g. 点击OK y~)1 1]'>  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 *zr(Zv  
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    脚本代码 M bb x`  
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    '#Language "WWB-COM" DZi!aJ  
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    Option Explicit {GC?SaK  
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    Sub Main V7/I>^X  
    By%=W5  
        'Cleanup )I3NeKWz  
        ClearOutputWindow() fMOU$0]$<  
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        Print "Merging RPC Photonics BSDF Data Files" V{JAB]?^  
        SetTextColor(255,0,0) #-bA[eQV  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." D:erBMKv,  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." gvL f|+m  
        SetTextColor(0,0,0) WL'P)lI5  
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        'Current directory of this script (should be the same as the text files being merged) 92EWIHEWZ  
        Dim cDir As String Yl3n2R /U  
        cDir = MacroDir$ & "\" xP[n  
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        'Array which will be populated with the list of files to be merged ,lyb!k8  
        Dim fList() As String, curFile As String o_'p3nD  
        GetFileList( cDir, fList ) C+TI]{t  
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        Print "" XHK70: i  
        Print "Files found for merging:" E@ESl0a;  
        For Each curFile In fList 2RX!V@z.G  
            Print Chr(9) & curFile yxH ( c  
        Next Sv +IS  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. o#skR4lwe  
        Dim nameArray() As String, sampName As String :53)N v  
        nameArray = Split(fList(0)," 0-0.txt") 62Z#Y Q}x  
        sampName  = nameArray(0) wYmM"60  
        Print "" sD=n95`v  
        Print "Sample name: " & Chr(9) & sampName RRI"d~~F6  
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        'Open an output file and write the FRED header data hC\6- 0u  
        Dim outFile As String 6Aku1h  
        outFile = cDir & sampName & "_FRED.txt" {|'E  
        Open outFile For Output As #1 :AE&Ny4  
        Print #1, "type bsdf_data" (JM5`XwM  
        Print #1, "format angles=deg bsdf=value scale=1" (Tbw3ENz  
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        'Loop the file list, skip the two header lines and write the remaining data to file T7#W0^tj  
        Dim lineArray() As String, curLine As Long svq<)hAf<  
        For Each curFile In fList /bi}'H+#  
            Print "Merging data from file " & curFile }yz (xH  
            ReadFile( cDir & curFile, lineArray ) Dp':oJC  
            For curLine = 2 To UBound(lineArray) HBMhtfWW  
                Print #1, lineArray(curLine) gy_>`16K  
            Next sashzVwJ-=  
        Next vMm1Z5S/  
    [DF,^4g  
        'Close the output file MerFZd 1  
        Close #1 |b)Y#)C;  
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        Print "Finished merging RPC data for sample " & sampName aL&n[   
        Print "FRED formatted data file: " & Chr(9) & outFile 1#ft#-g}  
    End Sub  m5r7  
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    'Utility function to read the contents of a file into an array of strings. {62n7'U{  
    Function ReadFile(ByVal fileName As String, _ fIsp;ca[k  
                      ByRef lineArray() As String) As Long LRNh@g4ei  
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        ReadFile = -1 , T8>}U(  
        Dim oFSO As Object 8]U{;|';  
        Set oFSO = CreateObject("Scripting.FileSystemObject") d%o&+l#  
        Erase lineArray ;<(W% _  
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        Dim fid As Long )s%[T-uKi  
        If oFSO.fileexists( fileName ) Then /so8WRu.  
            fid = FreeFile() (w}H]LQ  
            Open fileName For Input As fid * /:x sI  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) dF2nEaN0%  
            Close fid LyAn&h}  
        End If ~V\D|W9  
        Set oFSO = Nothing PEW=@xj2y  
        Return UBound( lineArray ) Z\k&gio5C^  
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    End Function 3GUZ;jdn  
    ;N 0~;I  
    Sub GetFileList( ByVal in_dir As String, _ "CI=`=  
                     ByRef in_flist() As String ) .8by"?**  
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        'Redimension the file list array 'LO^<  
        Erase in_flist j4cwI90=  
    ~2gG(1%At9  
        'Tracks how many files are found "-vW,7y  
        Dim fCount As Long BZ?.D_bu  
        fCount = 0 }#&#^ B#?O  
    }<9cL'  
        'Recurse directory and search for text files Wwr;-Qa}g  
        Dim f As String N-e @j4WU  
        f = Dir$(in_dir & "*.txt") NnT1X;0W  
        While f <> "" Y7*U:I+N  
            ReDim Preserve in_flist(fCount) v~@pMA$(h  
            in_flist(fCount) = f e,Uo#T6J  
            fCount += 1 V4KMOYqm  
            f = Dir$() mqSQL}vR  
        Wend Cd>WUw  
        ReDim Preserve in_flist(fCount-1) p(/dBt[3k  
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    End Sub }M H0L#Tu  
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