切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1680阅读
    • 0回复

    [分享]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6389
    光币
    26090
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 \AG ,dMS  
    VrDvd  
    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。
    I]h+24_S  
    zR:S.e<  
    背景 ,}<v:!  
    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。 :98Pe6  
    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。 &Jj ?C  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    cCwT0O#d  
    !Bd2$y.  
    [}Nfs3IlBw  
    步骤 zOcMc{w0   
    6Rso}hF}}  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 WWY9U  
    i/->g:47P  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    G$q=WM!%#s  
    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) ( mycUU%  
    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 5D'8 l@7  
    例如下所示: JprZ6 >  
    Sample name:  EDF-C1-56 3Vhm$y%Td  
    Merging data from file EDF-C1-56 0-0.txt {It4=I)M  
    Finished merging RPC data for sample EDF-C1-56 StE4n0V  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt }[1I_)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 P5Fm<f8\  
    a. 创建一个新的散射库 :f `1  
    b. 散射模型命名 }/6jom9U?  
    c. 改变散射模型为“Tabulated BSDF”. 6(wpf^br2  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) yjr!8L:m  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >_R5Li  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 U7Ps2~x3  
    g. 点击OK >:s:`Au  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 p%n}a%%I  
    KzhldMJ^zq  
    )y8$-"D(it  
    脚本代码 \!-X&ws  
    ~;{)S}U@R  
    '#Language "WWB-COM" ,cS|fG  
    =oSv=xY  
    Option Explicit RS$e^_W  
    @]~\H-8  
    Sub Main H -`7T;t~  
    `w&|~xT  
        'Cleanup k;"=y )@o  
        ClearOutputWindow() ?g!py[CrE  
    h!$W^Tm2g  
        Print "Merging RPC Photonics BSDF Data Files" Zl]\sJ1"  
        SetTextColor(255,0,0) o-R;EbL  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." MOdodyG  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Ig]Gg/1G  
        SetTextColor(0,0,0) 'Exj|Y&  
    Q[S""P.Z|  
        'Current directory of this script (should be the same as the text files being merged) ?DA,]aa-  
        Dim cDir As String :v=Yo  
        cDir = MacroDir$ & "\" ) =sm{R%T  
     |G{TA  
        'Array which will be populated with the list of files to be merged *l^h;RSx  
        Dim fList() As String, curFile As String ?> }bg  
        GetFileList( cDir, fList ) C;M.dd  
    GKSfr8US4  
        Print "" EG2NE,,r  
        Print "Files found for merging:" n a_Y<R`  
        For Each curFile In fList )9,9yd~SI  
            Print Chr(9) & curFile 0d~>zKho  
        Next <S%M*j  
    hQvSh\p  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6I"Q9(  
        Dim nameArray() As String, sampName As String ,i e84o  
        nameArray = Split(fList(0)," 0-0.txt") W& w -yZ  
        sampName  = nameArray(0) hC=9%u{r?  
        Print "" YeK PoW  
        Print "Sample name: " & Chr(9) & sampName fHdPav f,S  
    3w#kvtDVm  
        'Open an output file and write the FRED header data b&. o9PV"  
        Dim outFile As String Yu`b[]W  
        outFile = cDir & sampName & "_FRED.txt" Rcfh*"k  
        Open outFile For Output As #1 kT t;3Ia  
        Print #1, "type bsdf_data" dr'#  
        Print #1, "format angles=deg bsdf=value scale=1" '/G.^Zl9  
    P'xq+Q  
        'Loop the file list, skip the two header lines and write the remaining data to file weYP^>gH'  
        Dim lineArray() As String, curLine As Long G BV]7.  
        For Each curFile In fList ggIz) </  
            Print "Merging data from file " & curFile 7g[T#B'/x,  
            ReadFile( cDir & curFile, lineArray ) 8lh{ R  
            For curLine = 2 To UBound(lineArray) |]w0ytL>(2  
                Print #1, lineArray(curLine) .A//Q|ot!  
            Next I6ffp!^}Y  
        Next *2Il{KO A^  
    17 Hdj  
        'Close the output file JL=MlZ  
        Close #1 c%n[v3]  
    :$lx]  
        Print "Finished merging RPC data for sample " & sampName 9X/c%:)\=  
        Print "FRED formatted data file: " & Chr(9) & outFile < {$zOF}  
    End Sub Xkk m~sM6  
    Ox#%Dm2  
    'Utility function to read the contents of a file into an array of strings. m_wBRan  
    Function ReadFile(ByVal fileName As String, _ n(\5Z&  
                      ByRef lineArray() As String) As Long E=+v1\t)]  
    ]#z^G  
        ReadFile = -1 UJ3l8 %/`k  
        Dim oFSO As Object ov.7FZ+  
        Set oFSO = CreateObject("Scripting.FileSystemObject") fH-V!QYGF  
        Erase lineArray e p* (  
    <05\  
        Dim fid As Long \#Ez["mD  
        If oFSO.fileexists( fileName ) Then %{Ez0XwGCn  
            fid = FreeFile() Q&S\?cKe  
            Open fileName For Input As fid I'%vN^e^  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  Gqvj  
            Close fid 481J=8H  
        End If t&MJSFkiA  
        Set oFSO = Nothing |}P4Gr}6  
        Return UBound( lineArray ) G'T/I\tB  
    cPZD#";f  
    End Function v0&E!4q*'  
    :f<3`x'  
    Sub GetFileList( ByVal in_dir As String, _ l( /yaZ`  
                     ByRef in_flist() As String ) {L^b['h@  
    fS+Ga1CsH  
        'Redimension the file list array , g\%P5  
        Erase in_flist |7KW'=O  
    \W Kly  
        'Tracks how many files are found x2/L`q"M?=  
        Dim fCount As Long OLp;eb1g  
        fCount = 0 xO"fg9a  
    @5jJoy(mX@  
        'Recurse directory and search for text files ]NgK(I U  
        Dim f As String 7/%{7q3G>  
        f = Dir$(in_dir & "*.txt") Ad!= *n  
        While f <> "" *Y(v!x \L  
            ReDim Preserve in_flist(fCount) IMjz#|c  
            in_flist(fCount) = f #/!fLU@  
            fCount += 1 hqOy*!8'@  
            f = Dir$() rjqQWfShY  
        Wend ^|-*amh  
        ReDim Preserve in_flist(fCount-1) -? {bCq  
    =>Ss:SGjT  
    End Sub t-7^deG'/n  
    WxwSb`U|  
    Rrh?0qWs  
    QQ:2987619807 ;T6{J[ h  
     
    分享到