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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 hlPZTr=a  
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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 wYtL1D(  
    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。 6fvzTd},  
    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。 ]I9Hbw  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 h+e Oe}  
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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。 tGGv 2TCEy  
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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) OR[6pr@  
    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 5Xn+cw*  
    例如下所示: BJI}gm2y  
    Sample name:  EDF-C1-56 +u%^YBr  
    Merging data from file EDF-C1-56 0-0.txt i>!7/o  
    Finished merging RPC data for sample EDF-C1-56 %Z@+K_X9x  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt O>)<w Ms`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 1O bxQ_x  
    a. 创建一个新的散射库 ! 8q+W`{  
    b. 散射模型命名 ZMmaM "9  
    c. 改变散射模型为“Tabulated BSDF”. bWzv7#dd=  
    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 ) v,Lv4)  
    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。 _3UH"9g{  
    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 Nx~9Ug  
    g. 点击OK (are2!Oq  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 w9I7pIIl  
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    脚本代码  laX(?{_  
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    '#Language "WWB-COM" .Ap-<FB  
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    Option Explicit J&4QI( b.  
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    Sub Main Dm=t`_DL8  
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        'Cleanup mA|&K8H  
        ClearOutputWindow() %4#,y(dO  
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        Print "Merging RPC Photonics BSDF Data Files" wjk-$p  
        SetTextColor(255,0,0) @xKLRw  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." h8;B+#f`  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." _jK    
        SetTextColor(0,0,0) 8<(qN> R  
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        'Current directory of this script (should be the same as the text files being merged) %M{qr!?uj  
        Dim cDir As String H.EgL@;mb  
        cDir = MacroDir$ & "\" [Nb0&:$ay  
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        'Array which will be populated with the list of files to be merged j .Ro(0%  
        Dim fList() As String, curFile As String CZB!vh0  
        GetFileList( cDir, fList ) (Fq|hgOA>M  
    ' uvTOgP,  
        Print "" }ge~Nu>w  
        Print "Files found for merging:" yM$@*od  
        For Each curFile In fList D Q7+  
            Print Chr(9) & curFile O]{3aMs!Y  
        Next [+0rlmB  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. TWF6YAQ m  
        Dim nameArray() As String, sampName As String n< UuVu  
        nameArray = Split(fList(0)," 0-0.txt") ySP1,xq  
        sampName  = nameArray(0) Wyu$J  
        Print "" /]H6'  
        Print "Sample name: " & Chr(9) & sampName .kpL?_  
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        'Open an output file and write the FRED header data PW(4-H  
        Dim outFile As String pvL)BD  
        outFile = cDir & sampName & "_FRED.txt" f49pIcAq  
        Open outFile For Output As #1 Jy&O4g/'5  
        Print #1, "type bsdf_data" q$)$?"  
        Print #1, "format angles=deg bsdf=value scale=1" P" +!mSe^~  
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        'Loop the file list, skip the two header lines and write the remaining data to file *Ag</g@ h  
        Dim lineArray() As String, curLine As Long .?7u'%6x?{  
        For Each curFile In fList ,|hM`<"?  
            Print "Merging data from file " & curFile qfp,5@p  
            ReadFile( cDir & curFile, lineArray ) yOKpi&! r  
            For curLine = 2 To UBound(lineArray) VwfeaDJw  
                Print #1, lineArray(curLine) ~`'!nzP5H  
            Next x] [/9e  
        Next K)z{R n  
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        'Close the output file dQUZ11  
        Close #1 :1h1+b@,  
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        Print "Finished merging RPC data for sample " & sampName 8:9m< ^4S(  
        Print "FRED formatted data file: " & Chr(9) & outFile [JAHPy=+w  
    End Sub L ]HtmI  
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    'Utility function to read the contents of a file into an array of strings. l*^J}oY  
    Function ReadFile(ByVal fileName As String, _ KU,K E tf  
                      ByRef lineArray() As String) As Long #CKPNk c  
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        ReadFile = -1 RTN?[`  
        Dim oFSO As Object e>yPFXSk  
        Set oFSO = CreateObject("Scripting.FileSystemObject") sywSvnPuYZ  
        Erase lineArray EfxW^zm)  
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        Dim fid As Long <A{|=2<  
        If oFSO.fileexists( fileName ) Then A*d Pw.  
            fid = FreeFile() L?~>eT  
            Open fileName For Input As fid eVL #3|=  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8<BYAHY^  
            Close fid !|!k9~v!  
        End If uTsxSkHb/  
        Set oFSO = Nothing 3r{3HaN(^'  
        Return UBound( lineArray ) L$R"?O7  
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    End Function SU,S1C_q8  
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    Sub GetFileList( ByVal in_dir As String, _ KGsS2  
                     ByRef in_flist() As String ) w>-@h>Ln  
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        'Redimension the file list array b1rW0}A  
        Erase in_flist W5C8$Bqm  
    iBCZx>![;  
        'Tracks how many files are found ckn0I  
        Dim fCount As Long tK@|sZ>3\  
        fCount = 0 ;#'YO1`gf3  
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        'Recurse directory and search for text files NifD pqjgt  
        Dim f As String UoD S)(i  
        f = Dir$(in_dir & "*.txt") 2~`lvx  
        While f <> "" GnAG'.t-Z  
            ReDim Preserve in_flist(fCount) NC]]`O2r@  
            in_flist(fCount) = f 9;W 2zcN  
            fCount += 1 \X3Q,\H @  
            f = Dir$() U;SReWqU  
        Wend P X9GiJN"  
        ReDim Preserve in_flist(fCount-1) pe}mA}9U  
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    End Sub }s+ t*z  
     
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