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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 nD|Bo 9  
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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 tK1P7pbC8r  
    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。 XXvM*"3D5  
    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。 3 (jI  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Iy'a2@   
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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。 s@V4ny9x  
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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) m>DBO|`  
    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 Xnpw'<~X  
    例如下所示: K8daSvc  
    Sample name:  EDF-C1-56 PS**d$ S  
    Merging data from file EDF-C1-56 0-0.txt s: pmB\  
    Finished merging RPC data for sample EDF-C1-56 =wtu  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt G*JasHFs  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s$s~p +U  
    a. 创建一个新的散射库 y38x^fuYJ~  
    b. 散射模型命名 Z0 @P1  
    c. 改变散射模型为“Tabulated BSDF”. IN~Q(A]Z%  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Z7J8%ywQ  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 '9.L5*wh]  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 xim'TVwvC  
    g. 点击OK LR%]4$ /M  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f0S$p R  
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    脚本代码 gw O]U=Y  
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    '#Language "WWB-COM" {el,CT#  
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    Option Explicit =^3 Z L  
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    Sub Main wN Mf-~  
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        'Cleanup V(wm?Cc]  
        ClearOutputWindow() 2K wr=t  
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        Print "Merging RPC Photonics BSDF Data Files" C( wZj O?N  
        SetTextColor(255,0,0) "!,)Pv  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." #l 7(W G  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." M$,4B  
        SetTextColor(0,0,0) =/kwUjC?  
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        'Current directory of this script (should be the same as the text files being merged) %^pm~ck!  
        Dim cDir As String GBSuTu8  
        cDir = MacroDir$ & "\" @5}(Y( @  
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        'Array which will be populated with the list of files to be merged 5LaF'>1yY  
        Dim fList() As String, curFile As String  }o[N B  
        GetFileList( cDir, fList ) 'u}OeS"f  
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        Print "" R/EpfYOX  
        Print "Files found for merging:" )kIZm Q|f1  
        For Each curFile In fList Fzmc#?  
            Print Chr(9) & curFile JO-FnoQK  
        Next s+0n0C  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. tf IUH'Ez>  
        Dim nameArray() As String, sampName As String 2=IZD `{!  
        nameArray = Split(fList(0)," 0-0.txt") k|4}Do%;  
        sampName  = nameArray(0) s7?d_+O  
        Print "" -J":'xCP!  
        Print "Sample name: " & Chr(9) & sampName O%s7}bR3  
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        'Open an output file and write the FRED header data p54 e'Zb  
        Dim outFile As String d~qZ;uw  
        outFile = cDir & sampName & "_FRED.txt" ec h1{v\B|  
        Open outFile For Output As #1 |BEoF[1  
        Print #1, "type bsdf_data" blx"WVqo  
        Print #1, "format angles=deg bsdf=value scale=1" T-F8[dd^/  
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        'Loop the file list, skip the two header lines and write the remaining data to file kF-7OX0)  
        Dim lineArray() As String, curLine As Long T&ib]LmR  
        For Each curFile In fList E3V_qT8  
            Print "Merging data from file " & curFile OE/r0C<&  
            ReadFile( cDir & curFile, lineArray ) 6GMwB@ b  
            For curLine = 2 To UBound(lineArray) * `3+x  
                Print #1, lineArray(curLine) e'X"uH Xt.  
            Next NqC}}N\,  
        Next @rE+H 5  
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        'Close the output file 7*eIs2aY  
        Close #1 ("s!t?!&YS  
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        Print "Finished merging RPC data for sample " & sampName AzMX~cd  
        Print "FRED formatted data file: " & Chr(9) & outFile ^tL]QE?|  
    End Sub a\m0X@Q  
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    'Utility function to read the contents of a file into an array of strings. Wgm{ ]9Q  
    Function ReadFile(ByVal fileName As String, _ PG{"GiZz=  
                      ByRef lineArray() As String) As Long Bq~?!~\?.  
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        ReadFile = -1 ZMEYF!j N  
        Dim oFSO As Object lm8<0*;,  
        Set oFSO = CreateObject("Scripting.FileSystemObject") +{\b&q_  
        Erase lineArray !DBaC%TGC  
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        Dim fid As Long H<Zs2DP`  
        If oFSO.fileexists( fileName ) Then :M$8<03>F  
            fid = FreeFile() R:y u  
            Open fileName For Input As fid RY}:&vWDk  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Tffdm  
            Close fid Of;$ VK'  
        End If [Qn=y/._r  
        Set oFSO = Nothing ;F:Qz^=.a  
        Return UBound( lineArray ) :+<GJj_d+  
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    End Function r12e26_Ab  
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    Sub GetFileList( ByVal in_dir As String, _ `aL4YH-v  
                     ByRef in_flist() As String ) 7#sb },J{  
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        'Redimension the file list array Lf+3nN  
        Erase in_flist =k2"1f~e  
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        'Tracks how many files are found i}kMo@  
        Dim fCount As Long nm`}Z'&)  
        fCount = 0 J%P{/nR  
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        'Recurse directory and search for text files xHaoSs*C9  
        Dim f As String +IM6 GeH  
        f = Dir$(in_dir & "*.txt") 84c[Z   
        While f <> "" }/VSIS@Z  
            ReDim Preserve in_flist(fCount) -O6\!Wo=-  
            in_flist(fCount) = f * oru;=D@8  
            fCount += 1 E#`JH  
            f = Dir$() hQ Lh}}B  
        Wend t_iZ\_8  
        ReDim Preserve in_flist(fCount-1) Dl_SEf6b  
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    End Sub HE*P0Y f=  
     
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