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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 w&aZ 97{  
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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 _NsEeKU  
    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。 VIP7j(#t_g  
    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。 /q]rA  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 @a?7D;+<  
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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。 akzGJ3g  
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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) J{1H$[W~}  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Y"GNJtsL"  
    例如下所示: qJrT  
    Sample name:  EDF-C1-56 U\Wo&giP[  
    Merging data from file EDF-C1-56 0-0.txt #_wq#rF  
    Finished merging RPC data for sample EDF-C1-56 :eVZ5?F  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ){5Nod{}a  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 LKu\Mh|  
    a. 创建一个新的散射库 W-=6:y#A  
    b. 散射模型命名 ;/j2(O^  
    c. 改变散射模型为“Tabulated BSDF”. \g39>;iR  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) <h7cQ  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 [X.bR$>  
    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 K -U} sW  
    g. 点击OK -)`_w^Ox  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 kt/,& oKI  
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    脚本代码 J,2V&WuV0r  
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    '#Language "WWB-COM" uw}Rr7q  
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    Option Explicit YA4D?'  
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    Sub Main 7MKX`S  
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        'Cleanup lM6pYYEq=  
        ClearOutputWindow() hy5[ L`B  
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        Print "Merging RPC Photonics BSDF Data Files" to'7o8Z  
        SetTextColor(255,0,0) u5(8k_7  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." wGc7  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ?l0eU@rwQ  
        SetTextColor(0,0,0) x#>V50E  
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        'Current directory of this script (should be the same as the text files being merged) +xFn~b/  
        Dim cDir As String Lgg,K//g  
        cDir = MacroDir$ & "\" CJ IuMsZ  
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        'Array which will be populated with the list of files to be merged k6(7G@@}  
        Dim fList() As String, curFile As String P!eo#b^S  
        GetFileList( cDir, fList ) oN7SmP_  
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        Print "" pM?;QG;jA  
        Print "Files found for merging:" r )F;8(  
        For Each curFile In fList mlnF,+s  
            Print Chr(9) & curFile $TI^8 3  
        Next >HP `B2Q H  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.  Aqy w  
        Dim nameArray() As String, sampName As String j/O~8o&  
        nameArray = Split(fList(0)," 0-0.txt") :GXF=Df  
        sampName  = nameArray(0) =@HS  
        Print "" a+w2cN'  
        Print "Sample name: " & Chr(9) & sampName 6Y9N= \`  
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        'Open an output file and write the FRED header data Nd~B$venh  
        Dim outFile As String X0lPRk53(  
        outFile = cDir & sampName & "_FRED.txt" p['RV  
        Open outFile For Output As #1 l4bytI{63  
        Print #1, "type bsdf_data" 36 "n7  
        Print #1, "format angles=deg bsdf=value scale=1" xE/?ncTK^  
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        'Loop the file list, skip the two header lines and write the remaining data to file |N.2iN:  
        Dim lineArray() As String, curLine As Long 7o E0;'  
        For Each curFile In fList |R`"Zu`  
            Print "Merging data from file " & curFile f9.?+.^_  
            ReadFile( cDir & curFile, lineArray ) !J$r|IX5  
            For curLine = 2 To UBound(lineArray) Bn}woyJdx  
                Print #1, lineArray(curLine) $D bnPZ2$  
            Next J]F&4 O  
        Next Npp YUY  
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        'Close the output file q~ H>rC(\  
        Close #1 n5:uG'L\  
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        Print "Finished merging RPC data for sample " & sampName dljE.peL  
        Print "FRED formatted data file: " & Chr(9) & outFile ^/f~\ #R  
    End Sub d>QFmsh-  
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    'Utility function to read the contents of a file into an array of strings. HK;NR.D  
    Function ReadFile(ByVal fileName As String, _ L5&M@YTH  
                      ByRef lineArray() As String) As Long GEc6;uz<  
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        ReadFile = -1 \ TV  
        Dim oFSO As Object {)[o*+9  
        Set oFSO = CreateObject("Scripting.FileSystemObject") uYh!04u  
        Erase lineArray nV' 1 $L#  
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        Dim fid As Long osW"wh_  
        If oFSO.fileexists( fileName ) Then 3:J>-MO  
            fid = FreeFile() dSM\:/t  
            Open fileName For Input As fid &V].,12x  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) RRL{a6(?  
            Close fid $O"ss>8Se  
        End If vsY?q8+P  
        Set oFSO = Nothing T &ZQ ie/  
        Return UBound( lineArray ) r&gvP|W%  
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    End Function NR4+&d  
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    Sub GetFileList( ByVal in_dir As String, _ ~ao:9 ynY  
                     ByRef in_flist() As String ) $y(;"hy  
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        'Redimension the file list array cgnNO&  
        Erase in_flist \DB-2*a"  
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        'Tracks how many files are found ?CpVA  
        Dim fCount As Long R\j~X@vI  
        fCount = 0 ,f }$FZ  
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        'Recurse directory and search for text files + G@N  
        Dim f As String ^Q/*on;A,/  
        f = Dir$(in_dir & "*.txt") p3s i\Fm!  
        While f <> "" c%H' jB [  
            ReDim Preserve in_flist(fCount) ,AP&N'  
            in_flist(fCount) = f 2t= = <x  
            fCount += 1 c=m'I>A  
            f = Dir$()  RD$:.   
        Wend 'eM0i[E+`  
        ReDim Preserve in_flist(fCount-1) r!:yUPv  
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    End Sub Y_Yf'z1>[  
     
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