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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 xV,4U/ T  
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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 5xMA~I0c  
    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。 8tV=fSHd  
    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。 Pu$kj"|q*[  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 6`DwEs?Y{  
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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。 $_ix6z  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Ok}{jwJ%W;  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 '<?v:pb9  
    例如下所示: #JL&]Z+X6  
    Sample name:  EDF-C1-56 :$M9XZ~\  
    Merging data from file EDF-C1-56 0-0.txt 9<t9a f\.>  
    Finished merging RPC data for sample EDF-C1-56 vLv|SqD  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt p|h.@do4   
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 #.E\,N'  
    a. 创建一个新的散射库 ;#Jq$v)D  
    b. 散射模型命名 60hNCVq%  
    c. 改变散射模型为“Tabulated BSDF”. |TB@@ 2Ky&  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) er[" NSo  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 :(bdI]  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 X+dR<GN+YX  
    g. 点击OK ]5} -y3  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _l24Ba$F6  
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    脚本代码 nd$H 3sf  
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    '#Language "WWB-COM" N{1.g S  
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    Option Explicit ~/j$TT"  
    /*u#Ba<<  
    Sub Main .mvB99P{<  
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        'Cleanup J 6(~>g  
        ClearOutputWindow() hH <6E  
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        Print "Merging RPC Photonics BSDF Data Files" qpb/g6g  
        SetTextColor(255,0,0) vnz[w=U  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Z"6 2#VM  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." m0=cMVCA!  
        SetTextColor(0,0,0) @T<ad7g-2J  
    Tg"' pO  
        'Current directory of this script (should be the same as the text files being merged) e1^fUOS  
        Dim cDir As String 9U#\nXM  
        cDir = MacroDir$ & "\" %/UV_@x&  
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        'Array which will be populated with the list of files to be merged a$C2}  
        Dim fList() As String, curFile As String 0zg2g!lh  
        GetFileList( cDir, fList ) #d7N| 9_  
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        Print "" lq:]`l,6@  
        Print "Files found for merging:" C:]/8l  
        For Each curFile In fList TRF]i/Bs  
            Print Chr(9) & curFile S:/{  
        Next E)C.eW /  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Oq*n9V  
        Dim nameArray() As String, sampName As String #$LH2?)  
        nameArray = Split(fList(0)," 0-0.txt") ctp?y  
        sampName  = nameArray(0) )D:9R)m  
        Print "" z'7#"D  
        Print "Sample name: " & Chr(9) & sampName n4^~gT%b5]  
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        'Open an output file and write the FRED header data mfZ)^X  
        Dim outFile As String ,%A)"doaG  
        outFile = cDir & sampName & "_FRED.txt" :~vxZ*a  
        Open outFile For Output As #1 ?F ce!J  
        Print #1, "type bsdf_data" X6Un;UL  
        Print #1, "format angles=deg bsdf=value scale=1" uc'p]WhQ  
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        'Loop the file list, skip the two header lines and write the remaining data to file }-d)ms!  
        Dim lineArray() As String, curLine As Long T36x=LX  
        For Each curFile In fList As0 B\  
            Print "Merging data from file " & curFile DeH0k[o  
            ReadFile( cDir & curFile, lineArray ) T_eJ}(p  
            For curLine = 2 To UBound(lineArray) @zo7.'7P   
                Print #1, lineArray(curLine) (@+h5@J[`I  
            Next OFL|RLiD  
        Next uaiz*Im  
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        'Close the output file /dLA`=rZx  
        Close #1 27m@|M] R  
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        Print "Finished merging RPC data for sample " & sampName (4~X}:  
        Print "FRED formatted data file: " & Chr(9) & outFile xPt*CB  
    End Sub }7.#Dj/r6  
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    'Utility function to read the contents of a file into an array of strings. 8q0I:SJy  
    Function ReadFile(ByVal fileName As String, _ ?{eY\I  
                      ByRef lineArray() As String) As Long !K[/L< Kv  
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        ReadFile = -1 Rv,82iEKs  
        Dim oFSO As Object kQLT$8io  
        Set oFSO = CreateObject("Scripting.FileSystemObject") $0#6"urG  
        Erase lineArray 7Re-5vz R  
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        Dim fid As Long I FsE!oDs4  
        If oFSO.fileexists( fileName ) Then b vRB  
            fid = FreeFile() \b$<J.3  
            Open fileName For Input As fid -^Xy%  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) .$Y? W<  
            Close fid s O=4IBE  
        End If c_#*mA"+  
        Set oFSO = Nothing I+|uU g5  
        Return UBound( lineArray ) je,c7ZFO  
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    End Function 09d9S`cS\  
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    Sub GetFileList( ByVal in_dir As String, _ Nt~x&s  
                     ByRef in_flist() As String ) mZ7B<F[qV  
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        'Redimension the file list array L6+C]t}>6  
        Erase in_flist lm$;:Roj*  
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        'Tracks how many files are found 0Gsu  
        Dim fCount As Long "]#'QuR  
        fCount = 0 SNab   
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        'Recurse directory and search for text files =WK04\H  
        Dim f As String |n`PESf_  
        f = Dir$(in_dir & "*.txt") fagM7)x  
        While f <> "" (rcMA>2=  
            ReDim Preserve in_flist(fCount) 90fs:.  
            in_flist(fCount) = f Lc]1$  
            fCount += 1 =u=Kw R  
            f = Dir$() J4>;[\%m  
        Wend "Zcu[2,  
        ReDim Preserve in_flist(fCount-1) &yU>2=/T  
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    End Sub ^H3m\!h  
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