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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 Qraa0]56  
    ;WhRDmT  
    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 6{yn;D4  
    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。 ]bYmM@  
    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。 Jm"W+! E  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 O2"V'(  
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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。 @Bn4ZF B@  
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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) 6~x a^3G:  
    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 ef/43+F^x  
    例如下所示:  QS1lg  
    Sample name:  EDF-C1-56 )<qL8#["U  
    Merging data from file EDF-C1-56 0-0.txt Z'Pe%}3  
    Finished merging RPC data for sample EDF-C1-56 Ex skd}  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?Mn~XN4F_  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 9}Ge@a<j  
    a. 创建一个新的散射库 u7j,Vc'~  
    b. 散射模型命名 k4E9=y?  
    c. 改变散射模型为“Tabulated BSDF”. W=OryEV?  
    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 ) NytodVZ'3  
    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。 dczSW ]%  
    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 sf:IA%.4t  
    g. 点击OK *xY3F8  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 %~,Fe7#p  
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    脚本代码 uh\Tf5  
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    '#Language "WWB-COM" &xGpbJG  
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    Option Explicit RzzU+r  
    7S=,#  
    Sub Main 4jZB%tH  
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        'Cleanup  yK$aVK"  
        ClearOutputWindow() OhlK;hvdB*  
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        Print "Merging RPC Photonics BSDF Data Files" R0LWuE%eD  
        SetTextColor(255,0,0) _*b`;{3  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ]cVDXLj$  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." E'5KJn;_7  
        SetTextColor(0,0,0) T<NOL fk66  
    bf {_U%`  
        'Current directory of this script (should be the same as the text files being merged) GlRjbNW?Q  
        Dim cDir As String b;#_?2c  
        cDir = MacroDir$ & "\" ?mSZQF:d@  
    *ZFF$0}  
        'Array which will be populated with the list of files to be merged qywl G  
        Dim fList() As String, curFile As String [Q J  
        GetFileList( cDir, fList ) z( }w|  
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        Print "" 1i_%1Oip  
        Print "Files found for merging:" 5X>~39(r  
        For Each curFile In fList #y[omla8  
            Print Chr(9) & curFile @^  *62  
        Next @+Sr~:K  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c~;VvYu  
        Dim nameArray() As String, sampName As String (@qS  
        nameArray = Split(fList(0)," 0-0.txt") b{{ H@LTW  
        sampName  = nameArray(0) /e^) *r  
        Print "" vqO#Z  
        Print "Sample name: " & Chr(9) & sampName HavlN}h  
    ~I%164B+/  
        'Open an output file and write the FRED header data r;* |^>  
        Dim outFile As String ' i<4;=M&  
        outFile = cDir & sampName & "_FRED.txt" 5MD'AP:  
        Open outFile For Output As #1 4VwMl)8ic  
        Print #1, "type bsdf_data" \Q1&w2mw  
        Print #1, "format angles=deg bsdf=value scale=1" 3}&3{kt  
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        'Loop the file list, skip the two header lines and write the remaining data to file "PO8Q  
        Dim lineArray() As String, curLine As Long D6+3f #k6  
        For Each curFile In fList yNn=r;FZQ  
            Print "Merging data from file " & curFile x?0K'  
            ReadFile( cDir & curFile, lineArray ) .XiO92d9  
            For curLine = 2 To UBound(lineArray) z,7;+6*=L  
                Print #1, lineArray(curLine) U{LS_VI~  
            Next 3dLqlJ^7B  
        Next /h.{g0Xc  
    A'b$X1h  
        'Close the output file '5[(QM5Gi&  
        Close #1 N:k>V4oE  
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        Print "Finished merging RPC data for sample " & sampName nvXjW@)`  
        Print "FRED formatted data file: " & Chr(9) & outFile kR^h@@'F"  
    End Sub 1_v\G   
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    'Utility function to read the contents of a file into an array of strings. ^Jq('@  
    Function ReadFile(ByVal fileName As String, _ EG$-D@o\I  
                      ByRef lineArray() As String) As Long b=pk;'-  
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        ReadFile = -1 ;in-)`UC!  
        Dim oFSO As Object 2nCc(F&+?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") u a_w5o7  
        Erase lineArray y Rl   
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        Dim fid As Long ;v2eAe@7  
        If oFSO.fileexists( fileName ) Then l&e$:=;8  
            fid = FreeFile() 92A9gY  
            Open fileName For Input As fid .Y?]r6CC/  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,+6u6  
            Close fid SJMbYjn0J  
        End If ]&q<O0^'  
        Set oFSO = Nothing W|2|v?v  
        Return UBound( lineArray ) l 'wu-  
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    End Function xP&7i'ag  
    j 4=iHnE;  
    Sub GetFileList( ByVal in_dir As String, _ 1Q? RD%lkf  
                     ByRef in_flist() As String ) X#JUorGp  
    $,U/,XA {E  
        'Redimension the file list array \R]2YY`EP  
        Erase in_flist 7(h@5  
    NFx%e  
        'Tracks how many files are found hCr,6ncC  
        Dim fCount As Long =RRv& "2r  
        fCount = 0 6vE#$(n#a&  
    OW\vbWX  
        'Recurse directory and search for text files M|%bxG^l  
        Dim f As String RO/(Ldh  
        f = Dir$(in_dir & "*.txt") ~h Dp-R;  
        While f <> "" bo\Ah/.  
            ReDim Preserve in_flist(fCount) oe 6-F)+  
            in_flist(fCount) = f Q>Z~={"  
            fCount += 1 g@4~,  
            f = Dir$() S\A0gOL^  
        Wend J9*;Bqzim  
        ReDim Preserve in_flist(fCount-1) , h'Q  
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    End Sub _LC*_LT_  
     
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