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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 ``u:lL  
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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 so+4B1$)q  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 ghAi{@s$)  
    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。 mI7~c;~  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 S&(^<gwl  
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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。 pBp #a  
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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) sbo^"&%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 (qBvoLkF9N  
    例如下所示: 2(M6(xH>  
    Sample name:  EDF-C1-56 g=l:cVr8y  
    Merging data from file EDF-C1-56 0-0.txt QA;!caNp  
    Finished merging RPC data for sample EDF-C1-56 ~@4'HMQ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt }]+xFj9[>  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 o' 'wCr%  
    a. 创建一个新的散射库 wO.iKX;  
    b. 散射模型命名 qAY%nA>jO  
    c. 改变散射模型为“Tabulated BSDF”. 'dJ/RJ~  
    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 ) {gsdG-  
    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。 F|+W.9  
    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 ,v9f~qh  
    g. 点击OK nSx]QREL!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^2JpWY:|7  
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    脚本代码 .*YD&(  
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    '#Language "WWB-COM" 6l\FIah@  
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    Option Explicit 8K"+,s(%R  
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    Sub Main wJ+Aw  
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        'Cleanup [10zTU`  
        ClearOutputWindow() 1HT_  
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        Print "Merging RPC Photonics BSDF Data Files" ihCIh6  
        SetTextColor(255,0,0) '%saL>0  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." )C%N]9FvY  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." d3;qsUh$yv  
        SetTextColor(0,0,0) \qh *E#j  
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        'Current directory of this script (should be the same as the text files being merged) Vz=auM1xZ  
        Dim cDir As String I97yt[,Yy  
        cDir = MacroDir$ & "\" w ej[+y-  
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        'Array which will be populated with the list of files to be merged +}xaQc:0|  
        Dim fList() As String, curFile As String 28.~iw  
        GetFileList( cDir, fList ) O,@~L$a:YZ  
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        Print "" ?.=}pAub  
        Print "Files found for merging:" &>g'$a<[  
        For Each curFile In fList dt}_D={Be  
            Print Chr(9) & curFile -O!/Jv"{,[  
        Next a2 +~;{?g  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6NWn(pZ]p  
        Dim nameArray() As String, sampName As String R(Kk{c:-@  
        nameArray = Split(fList(0)," 0-0.txt") 5ExDB6Bx@y  
        sampName  = nameArray(0) ufV!+$C)is  
        Print "" txgQ"MGA%  
        Print "Sample name: " & Chr(9) & sampName Q Fm|-j  
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        'Open an output file and write the FRED header data (~~w7L s  
        Dim outFile As String Nes=;%&]G  
        outFile = cDir & sampName & "_FRED.txt" W,^W^:m-x  
        Open outFile For Output As #1 \daZ k /@  
        Print #1, "type bsdf_data" An*~-u9m  
        Print #1, "format angles=deg bsdf=value scale=1" yifY%!@Xu  
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        'Loop the file list, skip the two header lines and write the remaining data to file F[ ajOb8  
        Dim lineArray() As String, curLine As Long yS(}:'`r  
        For Each curFile In fList KnhoaBB  
            Print "Merging data from file " & curFile <_Z:'~Zp  
            ReadFile( cDir & curFile, lineArray ) 3DgsI7-F  
            For curLine = 2 To UBound(lineArray) ?<Wb@6kh`  
                Print #1, lineArray(curLine) U6E\AvbRn  
            Next BVsD( @lX  
        Next Q6gt+FKU9  
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        'Close the output file %p^.|Me7  
        Close #1 @yd4$Mv8%  
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        Print "Finished merging RPC data for sample " & sampName =@2FX&&E_  
        Print "FRED formatted data file: " & Chr(9) & outFile (+uj1z^  
    End Sub <f@"HG l  
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    'Utility function to read the contents of a file into an array of strings. m7EcnQf  
    Function ReadFile(ByVal fileName As String, _ ;Gx)Noo/>  
                      ByRef lineArray() As String) As Long /sM~U q?  
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        ReadFile = -1 J^R=dT!  
        Dim oFSO As Object 0Wa}<]:^  
        Set oFSO = CreateObject("Scripting.FileSystemObject") o<IAeH {+  
        Erase lineArray )-*5v D  
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        Dim fid As Long dL7E<?l  
        If oFSO.fileexists( fileName ) Then bVP"(H]  
            fid = FreeFile() n  -(  
            Open fileName For Input As fid JSh.]j<bJL  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) +)zOer,  
            Close fid K\"R&{+=  
        End If gs!(;N\j|  
        Set oFSO = Nothing -*5Rnx|Y{  
        Return UBound( lineArray ) F}Vr:~  
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    End Function 4_Dp+^JF  
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    Sub GetFileList( ByVal in_dir As String, _ g&/T*L  
                     ByRef in_flist() As String ) {uzf"%VtP  
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        'Redimension the file list array jZ NOt  
        Erase in_flist W9NX=gE4  
    D %Xo&V[  
        'Tracks how many files are found &0f5:M{P  
        Dim fCount As Long \&U>LwZd?  
        fCount = 0 q, O$ %-70  
    :y7c k/>  
        'Recurse directory and search for text files  : ]C~gc  
        Dim f As String k)EX(T\  
        f = Dir$(in_dir & "*.txt") 2-Y<4'>  
        While f <> "" J!5$,%v  
            ReDim Preserve in_flist(fCount) MEB it  
            in_flist(fCount) = f <b,~:9*?  
            fCount += 1 pz"0J_xDM  
            f = Dir$() x.S3Zi}=  
        Wend ~69&6C1Ch  
        ReDim Preserve in_flist(fCount-1) |sJSN.8  
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    End Sub 8OgLn?"P  
     
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