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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 { HHc} 8  
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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 ' GcN9D  
    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。 hV_bm@f/y  
    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。 yy8h8{=g  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 5 FKb7  
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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。 YBF|0A{[Y  
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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) d.>Zn?u4L  
    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 Mwm9{1{  
    例如下所示:  $I}7EI  
    Sample name:  EDF-C1-56 @M=xdZNyJ  
    Merging data from file EDF-C1-56 0-0.txt 4C m+xAXG  
    Finished merging RPC data for sample EDF-C1-56 ;tg9$P<85  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $^~dqmE2,  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,%Sf,h?"^  
    a. 创建一个新的散射库 J?DJA2o  
    b. 散射模型命名 , !0-;H.Y  
    c. 改变散射模型为“Tabulated BSDF”. !Z(3dtUy  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) xQ~}9Kt\  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 [ H|ifi  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 BeFCt;  
    g. 点击OK 'qoDFR\v  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 M4rI]^lJ  
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    脚本代码 !I)wI~XF)5  
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    '#Language "WWB-COM" u]`ur#_  
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    Option Explicit L JW0UF|  
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    Sub Main Ah#bj8}  
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        'Cleanup +T!7jC(O Q  
        ClearOutputWindow() 0vYHx V  
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        Print "Merging RPC Photonics BSDF Data Files" mssCnr;  
        SetTextColor(255,0,0) pXPLTGY<R+  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." crvq]J5  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 8r{:d i*  
        SetTextColor(0,0,0) /u&{=nU  
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        'Current directory of this script (should be the same as the text files being merged) ?hfyQhR  
        Dim cDir As String i (qPD_  
        cDir = MacroDir$ & "\" D2N<a=#  
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        'Array which will be populated with the list of files to be merged QY7Thnp1  
        Dim fList() As String, curFile As String Rlyx& C8  
        GetFileList( cDir, fList ) vHmsS\\~9  
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        Print "" (Vz\02,K  
        Print "Files found for merging:" vr2cDk{  
        For Each curFile In fList B QxU~s  
            Print Chr(9) & curFile E!rgR5Bd  
        Next <<vT"2Q]  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. z\g6E/%%  
        Dim nameArray() As String, sampName As String f5tkv<) %  
        nameArray = Split(fList(0)," 0-0.txt") .S{>?2  
        sampName  = nameArray(0) ]:g;S,{  
        Print "" Ew,1*WK!  
        Print "Sample name: " & Chr(9) & sampName rb_FBa%  
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        'Open an output file and write the FRED header data yH<a;@C  
        Dim outFile As String rfH'&k  
        outFile = cDir & sampName & "_FRED.txt" g#}a?kTM@  
        Open outFile For Output As #1 kklM"Av  
        Print #1, "type bsdf_data" /\-iV)h1@  
        Print #1, "format angles=deg bsdf=value scale=1" ;)7GdR^K  
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        'Loop the file list, skip the two header lines and write the remaining data to file ~E^lKe  
        Dim lineArray() As String, curLine As Long ;}W-9=81  
        For Each curFile In fList 5,~Ju>y*  
            Print "Merging data from file " & curFile D-KQRe2@  
            ReadFile( cDir & curFile, lineArray ) _$vAitUe4S  
            For curLine = 2 To UBound(lineArray) 'n$TJp|s  
                Print #1, lineArray(curLine) Tm) (?y  
            Next rEfo)jod  
        Next oU[>.Igi  
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        'Close the output file TQ`4dVaf  
        Close #1 vj#Y /B  
    FG @ ')N!g  
        Print "Finished merging RPC data for sample " & sampName ,z@"pI b  
        Print "FRED formatted data file: " & Chr(9) & outFile l =`?Im  
    End Sub bsosva+  
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    'Utility function to read the contents of a file into an array of strings. lKT<aYX  
    Function ReadFile(ByVal fileName As String, _ u|eV'-R)s  
                      ByRef lineArray() As String) As Long [OU[i(,{  
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        ReadFile = -1 !ma%Zk  
        Dim oFSO As Object jMUN|(=Y  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Tj3xK%K_r3  
        Erase lineArray G\4*6iw:  
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        Dim fid As Long L5{DWm~@  
        If oFSO.fileexists( fileName ) Then xZc].l6  
            fid = FreeFile() UZDXv=r|  
            Open fileName For Input As fid e{RhMjX<D  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) .KeZZLH  
            Close fid xC}9W6  
        End If f8JWg9 m  
        Set oFSO = Nothing 8G<{L0J%!  
        Return UBound( lineArray ) JIH6!  
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    End Function S?BI)shmg  
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    Sub GetFileList( ByVal in_dir As String, _ *rH# k?  
                     ByRef in_flist() As String ) e0 &x?U*/  
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        'Redimension the file list array b>]MZhLJe  
        Erase in_flist <>?7veN92  
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        'Tracks how many files are found H7Y :l0b  
        Dim fCount As Long \:Vm7Zg  
        fCount = 0 _GF{Duxh  
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        'Recurse directory and search for text files P+2@,?9#  
        Dim f As String )/mBq#ZS  
        f = Dir$(in_dir & "*.txt") tH^]`6"QUa  
        While f <> "" 15dbM/Gj  
            ReDim Preserve in_flist(fCount) k[<Uxh%  
            in_flist(fCount) = f -Ed<Kl  
            fCount += 1 2T&n6t$p  
            f = Dir$() S( Vssi|y  
        Wend SpJIEw  
        ReDim Preserve in_flist(fCount-1) 8%Eemk>G{  
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    End Sub Tk~Y  
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