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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 5q[0;`J  
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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 ;u LD_1%  
    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。 %-@`|  
    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。 /#J)EH4p  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 T*>n a8W  
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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。 gP.Q_/V  
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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) 4cK6B)X  
    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 P[PBoRd2  
    例如下所示: lp5`Kw\  
    Sample name:  EDF-C1-56 !Y_"q^5GG'  
    Merging data from file EDF-C1-56 0-0.txt ~~ ]/<d  
    Finished merging RPC data for sample EDF-C1-56 yn<z!z%mz  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ug!DL=ZW  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 .E|Hk,c9  
    a. 创建一个新的散射库 6~\z]LZ  
    b. 散射模型命名 ~uRG~,{rH  
    c. 改变散射模型为“Tabulated BSDF”. :bMCmY  
    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 ) wL,b.]  
    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。 MGIpo[  
    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 5,>1rd<B  
    g. 点击OK NUBzmnA>8  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 v=?U{{xQ  
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    脚本代码 -CW&!oW  
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    '#Language "WWB-COM" k;:v~7VF  
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    Option Explicit p8y_uN QE  
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    Sub Main x Yr-,$/  
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        'Cleanup ,LZ6Wu$P  
        ClearOutputWindow() jJl6H~ "q  
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        Print "Merging RPC Photonics BSDF Data Files" xI'<4lo7Z  
        SetTextColor(255,0,0) >%+ "-bY  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." dz.]5R  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ]@1YgV  
        SetTextColor(0,0,0) ke|v|@  
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        'Current directory of this script (should be the same as the text files being merged) }[Uh4k8P  
        Dim cDir As String e;pVoRI  
        cDir = MacroDir$ & "\" ]9)pFL  
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        'Array which will be populated with the list of files to be merged h{.KPK\  
        Dim fList() As String, curFile As String [8.ufpZ  
        GetFileList( cDir, fList ) zvL&V .>  
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        Print "" "5e~19  
        Print "Files found for merging:" VB*N;bM^  
        For Each curFile In fList ws tI8">  
            Print Chr(9) & curFile /ee:GjUkB  
        Next t$r^'ZN  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -@i)2J_WP  
        Dim nameArray() As String, sampName As String <Hhl=6op  
        nameArray = Split(fList(0)," 0-0.txt") &'Qz  
        sampName  = nameArray(0) Y+<C[Fiq  
        Print "" uOc>~ITPS  
        Print "Sample name: " & Chr(9) & sampName ]4\^>  
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        'Open an output file and write the FRED header data *wP8)yv7  
        Dim outFile As String dra'1E  
        outFile = cDir & sampName & "_FRED.txt" 5/DTE:M<  
        Open outFile For Output As #1 :ORCsl6-  
        Print #1, "type bsdf_data" 7CUu:6%  
        Print #1, "format angles=deg bsdf=value scale=1" &T]+g8''  
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        'Loop the file list, skip the two header lines and write the remaining data to file QL}5vSl  
        Dim lineArray() As String, curLine As Long KSVIX!EsX  
        For Each curFile In fList F/ 2@%,2n  
            Print "Merging data from file " & curFile #`:s:bwM:  
            ReadFile( cDir & curFile, lineArray ) 0~A<AF*t  
            For curLine = 2 To UBound(lineArray) I!jSAc{  
                Print #1, lineArray(curLine) N<hbV0$%  
            Next [Z,A quCU(  
        Next '0X!_w6W  
    xC`Hm?kM  
        'Close the output file p*!@z|F>U  
        Close #1 mLk@&WxG  
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        Print "Finished merging RPC data for sample " & sampName n)} J<  
        Print "FRED formatted data file: " & Chr(9) & outFile x `PIJE  
    End Sub dJ?VN!B0  
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    'Utility function to read the contents of a file into an array of strings. :tdx:  
    Function ReadFile(ByVal fileName As String, _ 3`TC*  
                      ByRef lineArray() As String) As Long JwB:NqB  
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        ReadFile = -1 dpZ7eJ   
        Dim oFSO As Object ,TOLr%+v~n  
        Set oFSO = CreateObject("Scripting.FileSystemObject") X~0l1 @!  
        Erase lineArray YC&iH>jO3  
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        Dim fid As Long pW:h\}%`n  
        If oFSO.fileexists( fileName ) Then !/< 5.9!9r  
            fid = FreeFile() PZNo.0M70  
            Open fileName For Input As fid =t@m:  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) x~s>  
            Close fid }yx{13:[  
        End If MP[v 9m@  
        Set oFSO = Nothing FtM7+>Do.  
        Return UBound( lineArray ) $DA0lY\  
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    End Function wuzz Wq  
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    Sub GetFileList( ByVal in_dir As String, _ -/x +M-X#  
                     ByRef in_flist() As String ) m8 0+b8b  
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        'Redimension the file list array dadOjl)S)  
        Erase in_flist :FG}k Y  
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        'Tracks how many files are found `Kym{og  
        Dim fCount As Long :N8D1e-a  
        fCount = 0 kjNA~{  
    :m#vvH  
        'Recurse directory and search for text files L!S-f4^5  
        Dim f As String Pdf_{8 r  
        f = Dir$(in_dir & "*.txt") n/$BdFH  
        While f <> "" %T'?7^\>  
            ReDim Preserve in_flist(fCount) ~e{2Y%  
            in_flist(fCount) = f Y D.3FTNGC  
            fCount += 1 KG>.7xVWV7  
            f = Dir$() {!N4|  
        Wend wB9IP{Pf  
        ReDim Preserve in_flist(fCount-1) FT|*~_@  
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    End Sub DIk$9$"<x  
     
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