切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1771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
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 ex#-,;T  
    gL~3z'$  
    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。
    +xAD;A4  
    qC=9m[MI  
    背景 62kA(F 0e,  
    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。 ?VCp_Ji  
    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。 KSJ+3_7 ]k  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    gil:SUW1r  
    vTo+jQs^  
    h@]{j_$u  
    步骤 A#{I- *D[  
    :fDzMD  
    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。 fu{v(^  
    jd2 p~W  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    ([|^3tM  
    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) [0 rH/{  
    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 h+7U'+|%A  
    例如下所示: Lr20xm  
    Sample name:  EDF-C1-56 W6`_ lGTj  
    Merging data from file EDF-C1-56 0-0.txt x?]fHin_  
    Finished merging RPC data for sample EDF-C1-56 PT~F ^8,)  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Lp3pJE  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 P9R-41!  
    a. 创建一个新的散射库 X40JCQx{+  
    b. 散射模型命名 Zx`/88!x[  
    c. 改变散射模型为“Tabulated BSDF”. Vx:uqzw#  
    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 ) c6 .j$6t  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ,S m?2<  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 @My RcC  
    g. 点击OK (#x&Y#5  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 YzJWS|]  
    [vz2< genn  
    _v 8u%  
    脚本代码 ,$aqF<+;  
    ?r*}1WsH  
    '#Language "WWB-COM" 4uh~@Lv  
    FjI1'Ah\  
    Option Explicit J*zQ8\f=}  
     $C,` ^n'  
    Sub Main t'yh&44_  
    vR pO0qG  
        'Cleanup O'(D:D?  
        ClearOutputWindow() "r8N- h/P  
    asE.!g?  
        Print "Merging RPC Photonics BSDF Data Files" fGW~xul_  
        SetTextColor(255,0,0) +6~zMKp  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." RH$l?j6  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." !b+!] 2~g}  
        SetTextColor(0,0,0) [z*1#lj S  
    bSQj=|h1  
        'Current directory of this script (should be the same as the text files being merged) zG c ]*R  
        Dim cDir As String !HtW~8|:  
        cDir = MacroDir$ & "\" FW)~e*@8=  
    In;P33'p  
        'Array which will be populated with the list of files to be merged l)~$/#k  
        Dim fList() As String, curFile As String a1ps'^Qhh  
        GetFileList( cDir, fList ) (WP^}V5  
    {iCX?Sb  
        Print "" 0W_u"UY$c  
        Print "Files found for merging:" ~0o>B$xJ  
        For Each curFile In fList ooCfr?E  
            Print Chr(9) & curFile ~$rSy|19  
        Next _;/+8=  
    c>! ^\  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. |VjD. ]I  
        Dim nameArray() As String, sampName As String F7/%,vf  
        nameArray = Split(fList(0)," 0-0.txt") 0-uVmlk=/  
        sampName  = nameArray(0) )3V1aC  
        Print "" RE-y5.kE^  
        Print "Sample name: " & Chr(9) & sampName T11>&K)  
    W^c /l*>v  
        'Open an output file and write the FRED header data &" 5Yt&{  
        Dim outFile As String ~]9EhC'l  
        outFile = cDir & sampName & "_FRED.txt" ah(k!0PV  
        Open outFile For Output As #1 ($8!r|g5#  
        Print #1, "type bsdf_data" 3<[q>7X  
        Print #1, "format angles=deg bsdf=value scale=1" Q4Qf/q;U  
    ;#8xRLW  
        'Loop the file list, skip the two header lines and write the remaining data to file -a"b:Q  
        Dim lineArray() As String, curLine As Long :~ &#9  
        For Each curFile In fList h2= wC.  
            Print "Merging data from file " & curFile R((KAl]dL  
            ReadFile( cDir & curFile, lineArray ) r%>7n,+o  
            For curLine = 2 To UBound(lineArray) :QHh;TIG=<  
                Print #1, lineArray(curLine) T-x9IoE  
            Next ?k@;,l :s  
        Next C*1 1?B[  
    [M:<!QXw  
        'Close the output file FBOgaI83G  
        Close #1 rd24R-6  
    ~zvZK]JoX  
        Print "Finished merging RPC data for sample " & sampName {Q`Q2'@  
        Print "FRED formatted data file: " & Chr(9) & outFile )jjaY1E  
    End Sub o3NB3@uj<  
    )(c%QWz  
    'Utility function to read the contents of a file into an array of strings. !kH 1|  
    Function ReadFile(ByVal fileName As String, _ >7 cDfv"  
                      ByRef lineArray() As String) As Long 3{Zd<JYg4-  
    10GU2a$0"$  
        ReadFile = -1 ER}5`*X{  
        Dim oFSO As Object rZ.z!10  
        Set oFSO = CreateObject("Scripting.FileSystemObject") sheCwhV  
        Erase lineArray dl`{:ZR S  
    N-Bw&hEZ  
        Dim fid As Long ^ ]+vtk  
        If oFSO.fileexists( fileName ) Then pwB>$7(_h  
            fid = FreeFile() %F}d'TPx  
            Open fileName For Input As fid nyOmNvZf  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) q]s_hWWv  
            Close fid NQcg}y  
        End If FJ{&R Ld  
        Set oFSO = Nothing jz>b>;  
        Return UBound( lineArray ) M=4b  
    qd~9uo&[Ig  
    End Function S/l6c P  
    Ka%#RNW  
    Sub GetFileList( ByVal in_dir As String, _ M7-2;MZ  
                     ByRef in_flist() As String ) 5dbj{r)s6i  
    1F+JyZK}w  
        'Redimension the file list array 9ESV[  
        Erase in_flist 5v=e(Ph +  
    H7meI9L  
        'Tracks how many files are found SO<9?uk.  
        Dim fCount As Long 2 i NZz  
        fCount = 0 cJM.Q_I}Y  
    T {=&>pNK[  
        'Recurse directory and search for text files O.8k [Ht  
        Dim f As String a(G}<  
        f = Dir$(in_dir & "*.txt") p9S>H  
        While f <> "" IABF_GwF  
            ReDim Preserve in_flist(fCount) ,pVe@d'  
            in_flist(fCount) = f ft4hzmuzM  
            fCount += 1 ~]'yUd1gSZ  
            f = Dir$() g yT0h?xDt  
        Wend d'b9.ki\  
        ReDim Preserve in_flist(fCount-1) .SNg2.  
    ),^pi?  
    End Sub .kgt? r  
    M)H*$!x}>  
    +Y$EZL.A  
    QQ:2987619807 +wI<w|!  
     
    分享到