切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1938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
    6515
    光币
    26724
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 zG%ZDH^82_  
    4pkTOQq_tQ  
    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。
    \@%sX24D  
    /d/Quro  
    背景 >%PPp.R  
    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。 B^{87YR  
    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。 Hf^Tok^6@]  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    }3rWmo8V  
    d7O\p(M1  
    T d6Gu"  
    步骤 N=?! ~n9Q-  
    ,:G3Y )  
    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。 *CnrzrKtQ  
    (l~3~n  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    c2$&pZ M  
    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) T@. $Zpz  
    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 qrq9NPf  
    例如下所示: tWo MUp  
    Sample name:  EDF-C1-56 qUW>qi,  
    Merging data from file EDF-C1-56 0-0.txt 0'{`"QD\IW  
    Finished merging RPC data for sample EDF-C1-56 W@:a3RJ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt G0u3*.  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0xNlO9b/  
    a. 创建一个新的散射库 ~w>Z !RuhT  
    b. 散射模型命名 1|PmZPKq9n  
    c. 改变散射模型为“Tabulated BSDF”. OP-%t\sj>  
    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 ) 1.5lJ:[G  
    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。 YflotlT}  
    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 guD?~-Q  
    g. 点击OK <;?&<qMo,P  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Xc^7  
    Q I.*6-(  
    A{7N#-h_  
    脚本代码  ;7F|g  
    E?& x5?  
    '#Language "WWB-COM" TF@HwF"#  
    V r0-/T  
    Option Explicit 4cO||OsMU  
    ? 77ye  
    Sub Main $B iG7,[#  
    F[ Itq  
        'Cleanup i>M*ubWE4@  
        ClearOutputWindow() -}ebn*7i\  
    -CTsB)=\,  
        Print "Merging RPC Photonics BSDF Data Files" <IF\;,.c  
        SetTextColor(255,0,0) ~'4:{xH  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." $j~oB:3n7  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 7{vnhl(Z  
        SetTextColor(0,0,0) mQ9%[U,  
    j=^b'dyL  
        'Current directory of this script (should be the same as the text files being merged) 9u'hCi(  
        Dim cDir As String WAj26";M(  
        cDir = MacroDir$ & "\" W biUz2)  
    lB\ "*K;  
        'Array which will be populated with the list of files to be merged ,]N!I%SI  
        Dim fList() As String, curFile As String qdn\8Pn  
        GetFileList( cDir, fList ) 1m/=MET]  
    r|Y|u v0  
        Print "" EO|r   
        Print "Files found for merging:" !d1}IU-h  
        For Each curFile In fList r: _- Cj  
            Print Chr(9) & curFile N_vVEIO9  
        Next 6, Q{/  
    n7vLw7  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. X;5U@l  
        Dim nameArray() As String, sampName As String t9&z|?Vz  
        nameArray = Split(fList(0)," 0-0.txt") k3m|I*_\L  
        sampName  = nameArray(0) `p&ko$i2  
        Print "" M} IRagm  
        Print "Sample name: " & Chr(9) & sampName lQ%]](a6  
    yG0Wr=/<?  
        'Open an output file and write the FRED header data Av*R(d=`  
        Dim outFile As String YbC6&_  
        outFile = cDir & sampName & "_FRED.txt" u.gh04{5  
        Open outFile For Output As #1 b; SFnZa8  
        Print #1, "type bsdf_data" bOCdf"!g  
        Print #1, "format angles=deg bsdf=value scale=1" lLHHuQpuj  
    DytOS}/^9  
        'Loop the file list, skip the two header lines and write the remaining data to file 7"f$;CN?~  
        Dim lineArray() As String, curLine As Long %PG::b  
        For Each curFile In fList }6]V*Kn,  
            Print "Merging data from file " & curFile s)HbBt-  
            ReadFile( cDir & curFile, lineArray ) #R|M(Z">q  
            For curLine = 2 To UBound(lineArray) n=RAE^[M  
                Print #1, lineArray(curLine) r^P}xGGK  
            Next {6<7M  
        Next *seKph+'c  
    66=6;77  
        'Close the output file z9$x9u  
        Close #1 }>xgzhdT  
    _Z6/r^c  
        Print "Finished merging RPC data for sample " & sampName qy@gW@IU  
        Print "FRED formatted data file: " & Chr(9) & outFile }H{{@RU  
    End Sub +a sJV1a  
    xIF z@9+k  
    'Utility function to read the contents of a file into an array of strings. u+s#Fee I  
    Function ReadFile(ByVal fileName As String, _ -e%=Mpq.  
                      ByRef lineArray() As String) As Long )BTJs)E  
    &a8#qv"l  
        ReadFile = -1 Ms(;B*  
        Dim oFSO As Object iQ-;0<=G  
        Set oFSO = CreateObject("Scripting.FileSystemObject") !23W=N}82  
        Erase lineArray TE*$NxQ 2  
    Ta!.oC[  
        Dim fid As Long p;j$i6YJ  
        If oFSO.fileexists( fileName ) Then j:|60hDz^  
            fid = FreeFile() "yc/8{U  
            Open fileName For Input As fid NV;5T3  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) R*TCoEKO  
            Close fid Ii*v(`2b  
        End If $X9Ban]  
        Set oFSO = Nothing 1l\O9D +$  
        Return UBound( lineArray ) ok'0Byo  
    1q~U3'l:$  
    End Function ue/6DwUv  
    S#+G?I3w  
    Sub GetFileList( ByVal in_dir As String, _ Sct-,K%i  
                     ByRef in_flist() As String ) $t 1]w]}d  
    ]Vl5v5_  
        'Redimension the file list array #X"\:yN  
        Erase in_flist |i?AtOt@f  
    7^KQQ([  
        'Tracks how many files are found *8/Q_w  
        Dim fCount As Long FTCp3g  
        fCount = 0 ]rn!+z  
    [p!C+ |rro  
        'Recurse directory and search for text files N,'JQch},8  
        Dim f As String P xpz7He  
        f = Dir$(in_dir & "*.txt") *&UVr  
        While f <> "" =]xNpX)  
            ReDim Preserve in_flist(fCount) l(=#c/f  
            in_flist(fCount) = f I6y&6g  
            fCount += 1 ADv a@P  
            f = Dir$() NFLmM  
        Wend < q; ]  
        ReDim Preserve in_flist(fCount-1) ,l; &Tb=k  
    83i%3[L  
    End Sub h,140pW  
    5B2x# m|8  
    AV d  
    QQ:2987619807 )r?i^D&4  
     
    分享到