切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 917阅读
    • 0回复

    [技术]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 ]V36-%^  
    t7w-TJvP  
    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。
    6<x~Mk'u)  
    gA~20LSt  
    背景 wMb)6YZs  
    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。 1, "I=  
    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。 zL:&Q<  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    :}y9$p  
    #NvQmz?J?  
    &?.n2+T+ =  
    步骤 3 p/b  
    D]IBB>F  
    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。 fdlvn*H  
    6'xomRpYN  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    qWsylC23  
    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\>|C1oRy  
    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 EL^8zyg%%  
    例如下所示: Zg V~W#t  
    Sample name:  EDF-C1-56 'lJEHz\  
    Merging data from file EDF-C1-56 0-0.txt vQ:wW',i  
    Finished merging RPC data for sample EDF-C1-56 .L9']zXc`  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt =p <?Hu  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7~_I=-  
    a. 创建一个新的散射库 9-0<*)"b>  
    b. 散射模型命名 pzp,t(%j  
    c. 改变散射模型为“Tabulated BSDF”. 1/B]TT  
    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 ) n(g)UNx  
    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。 L}'Yd'  
    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 *7ZGq(O  
    g. 点击OK V=pMq?Nr  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 UMV)wy|j  
    #j;Tb2&w  
    F{<5aLaYti  
    脚本代码 ? ^M /[@  
    {esJ=FV\  
    '#Language "WWB-COM" >F1G!#$0  
    x^G'rF"nT  
    Option Explicit xc9YM0B&  
    U-i.(UyZ  
    Sub Main "~F3*lk#E  
    7R}9oK_I  
        'Cleanup 4({( i  
        ClearOutputWindow() AS)UJ/lC  
    $ a?  
        Print "Merging RPC Photonics BSDF Data Files" 0}{'C5  
        SetTextColor(255,0,0) :\XI0E  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ui:=  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." k1)%.pt%  
        SetTextColor(0,0,0) NzQ9Z1Mxy  
    bLzs?eos  
        'Current directory of this script (should be the same as the text files being merged) ^W~p..DF  
        Dim cDir As String S}(8f!9<  
        cDir = MacroDir$ & "\" Z$ p0&~   
    k.<3HU  
        'Array which will be populated with the list of files to be merged y<pnp?x4  
        Dim fList() As String, curFile As String "- 31'R-  
        GetFileList( cDir, fList ) QT! 4[,4  
    ]1D%zKY%$Z  
        Print "" (D<(6?  
        Print "Files found for merging:" `s|]"'rX  
        For Each curFile In fList &?0:v`4Y  
            Print Chr(9) & curFile *wuqa) q2  
        Next F>zl9Vi<  
    O~!T3APGU  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {`(>O"_[Q  
        Dim nameArray() As String, sampName As String t 42ub  
        nameArray = Split(fList(0)," 0-0.txt") -'`TL$  
        sampName  = nameArray(0) > @_im6  
        Print "" .f:n\eT):  
        Print "Sample name: " & Chr(9) & sampName <F;v`h|+S  
    uI~s8{0T6  
        'Open an output file and write the FRED header data 20b<68h$:  
        Dim outFile As String 0V$k7H$Z  
        outFile = cDir & sampName & "_FRED.txt" BecP T  
        Open outFile For Output As #1 LJFG0 W  
        Print #1, "type bsdf_data" W#'c 5:m 4  
        Print #1, "format angles=deg bsdf=value scale=1" %ft &Q  
    YAVy9$N-  
        'Loop the file list, skip the two header lines and write the remaining data to file 0p(L'  
        Dim lineArray() As String, curLine As Long b0v:12q  
        For Each curFile In fList T f4tj!t-  
            Print "Merging data from file " & curFile >(r{7Qg  
            ReadFile( cDir & curFile, lineArray ) /ASaB  
            For curLine = 2 To UBound(lineArray) b| M3 `  
                Print #1, lineArray(curLine) mO*^1  
            Next :O-iykXyI  
        Next t23'x0l  
    z'7[Tie  
        'Close the output file K4Sk+ v  
        Close #1 :~F:/5  
    ( #D*Pl  
        Print "Finished merging RPC data for sample " & sampName vxFTen{-F  
        Print "FRED formatted data file: " & Chr(9) & outFile 6E ~g#(8  
    End Sub G7GZDi  
    )+P]Vf\jH  
    'Utility function to read the contents of a file into an array of strings. G{Yz8]m  
    Function ReadFile(ByVal fileName As String, _ {ZU1x C  
                      ByRef lineArray() As String) As Long ({s6eqMhDd  
    /./"x~@  
        ReadFile = -1 g{IF_ 1  
        Dim oFSO As Object uo\ .7[1  
        Set oFSO = CreateObject("Scripting.FileSystemObject") [XVEBA4GI  
        Erase lineArray tVuWVJ4M  
    +Hvc_Av''  
        Dim fid As Long )s_n  
        If oFSO.fileexists( fileName ) Then ,`D~py,  
            fid = FreeFile() a"N4~?US  
            Open fileName For Input As fid ldha|s.*  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) $+JS&k/'m  
            Close fid O.aG[ wm8  
        End If d^03"t0O]  
        Set oFSO = Nothing W%<LTWOc  
        Return UBound( lineArray ) (jjTK'0[  
    ?eH&'m}-  
    End Function F{06 _T  
    Snp|!e  
    Sub GetFileList( ByVal in_dir As String, _ l^GP3S  
                     ByRef in_flist() As String ) }%b;vzkG5  
    I V%zO+  
        'Redimension the file list array 9. 'h^#C  
        Erase in_flist '* mH*?Y  
    De7T s  
        'Tracks how many files are found ^;!0j9"* :  
        Dim fCount As Long 2M#M"LHo  
        fCount = 0 glDcUCF3  
    lC:k7<0Ji  
        'Recurse directory and search for text files Lbe\@S   
        Dim f As String vEf4HZ&w  
        f = Dir$(in_dir & "*.txt") V7#v6!7A@  
        While f <> "" GjoIm?  
            ReDim Preserve in_flist(fCount) )u))n#P  
            in_flist(fCount) = f |,9JNm$  
            fCount += 1 4XVCHs(  
            f = Dir$() zvABU+{jD  
        Wend V5+SWXZ  
        ReDim Preserve in_flist(fCount-1) @SCI"H%[  
    %ZHP2j %~  
    End Sub c/c$D;T  
     
    分享到