切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 963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
    6429
    光币
    26290
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 }{iR+M X  
    /^#} \<;  
    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。
    {y<_S]0  
    Yo7ctwzdH;  
    背景 f$2lq4P{  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 i"JF~6c<  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 K\?vTgc(  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    '?3Hy|}  
    /&kZ)XOi  
    ).v;~yE   
    步骤 xFg=Tyq:  
    9oc[}k-M  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 diTzolY7  
    .YS[Md{  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    j1/J9F'  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) :&_@U$  
    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 CZ]+B8Pl(x  
    例如下所示: >{m>&u;Cc  
    Sample name:  EDF-C1-56 i}HF  
    Merging data from file EDF-C1-56 0-0.txt A\4 Gq  
    Finished merging RPC data for sample EDF-C1-56 WU=Os8gR  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 3*8#cSQ/6o  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N.&)22<m9  
    a. 创建一个新的散射库 DCw ldkdJN  
    b. 散射模型命名 Q8\Ks|u]  
    c. 改变散射模型为“Tabulated BSDF”. \9ap$  
    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 ) ty-4yK#  
    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。 Q|pz].0  
    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 #wC4$y<>  
    g. 点击OK |W#^L`!G  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oxGOn('  
    Ma{|+\Q.Z  
    pdtK3Pf  
    脚本代码 Q@d X2  
    &3u* zV$  
    '#Language "WWB-COM" jriliEz;f  
    #}k^g:l1  
    Option Explicit [bGdg  
    F}sfk}rp  
    Sub Main t5 5k#`Z  
    0D.YO<PU  
        'Cleanup :+[q `  
        ClearOutputWindow()  \f  
    u_:" u  
        Print "Merging RPC Photonics BSDF Data Files" @8/-^Rh*  
        SetTextColor(255,0,0) NINyg"g<  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 6'qs=Ql  
        Print "Note: Do not run this script multiple times without deleting the output file between executions."  wl9E  
        SetTextColor(0,0,0) a<vCAFQ  
    T}4RlIZF  
        'Current directory of this script (should be the same as the text files being merged)  : [AW  
        Dim cDir As String y YF80mnJz  
        cDir = MacroDir$ & "\" '<XG@L  
    bLf }U9  
        'Array which will be populated with the list of files to be merged W6wgX0H  
        Dim fList() As String, curFile As String Kq.)5%~>  
        GetFileList( cDir, fList ) qU=$ 0M  
    $vc:u6I[  
        Print "" (?J&Ar0  
        Print "Files found for merging:" -y$|EOi?  
        For Each curFile In fList zeR!Y yt!  
            Print Chr(9) & curFile (c[|k  
        Next nwV\ [E  
    (<3'LhFII  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. L4Kkbt<x  
        Dim nameArray() As String, sampName As String E5 Y92vu  
        nameArray = Split(fList(0)," 0-0.txt") AZtZa'hbkQ  
        sampName  = nameArray(0) ~Jq<FVK  
        Print "" D+"5R5J",  
        Print "Sample name: " & Chr(9) & sampName ) 8LCmvQ  
    ot,<iE#za  
        'Open an output file and write the FRED header data *+Q,b^N  
        Dim outFile As String vsES`  
        outFile = cDir & sampName & "_FRED.txt" h^[K= J  
        Open outFile For Output As #1 - d>)  
        Print #1, "type bsdf_data" n]_8!NU  
        Print #1, "format angles=deg bsdf=value scale=1" lf Wxdi  
    JY%c<  
        'Loop the file list, skip the two header lines and write the remaining data to file "3}Bv X  
        Dim lineArray() As String, curLine As Long c t,p?[Q  
        For Each curFile In fList 3:);vh!  
            Print "Merging data from file " & curFile {mueP6Gz@J  
            ReadFile( cDir & curFile, lineArray ) t;E-9`N  
            For curLine = 2 To UBound(lineArray) Pm;"Y!S<  
                Print #1, lineArray(curLine) =">O;L.xj  
            Next @gs Kb* ,  
        Next zf2]|]*xz  
    xt40hZ$  
        'Close the output file ,=z8aiUu  
        Close #1 i}M&1E  
    3QGg;  
        Print "Finished merging RPC data for sample " & sampName 3pq&TYQU  
        Print "FRED formatted data file: " & Chr(9) & outFile n;!t?jnf.  
    End Sub P3@[x  
    QbS w<V  
    'Utility function to read the contents of a file into an array of strings. [\. ho9  
    Function ReadFile(ByVal fileName As String, _ %'EOFv]  
                      ByRef lineArray() As String) As Long ~f ){`ZJc  
    O2A Z|[*I  
        ReadFile = -1 %:((S]vAi  
        Dim oFSO As Object Po=)jkW  
        Set oFSO = CreateObject("Scripting.FileSystemObject") I[&z#foN=w  
        Erase lineArray ,R*ru*  
     ZY keW  
        Dim fid As Long 30[?XVI&  
        If oFSO.fileexists( fileName ) Then >*Y~I0>  
            fid = FreeFile() D<Ads  
            Open fileName For Input As fid zD2B hta y  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8a e]tX5$  
            Close fid Lsuc*Ps  
        End If R-hqaEB  
        Set oFSO = Nothing J&Le*R'  
        Return UBound( lineArray ) 7c<2oTN'  
    jskATA /  
    End Function UZ&bT'>;9g  
    q4(&.Al\@  
    Sub GetFileList( ByVal in_dir As String, _ a<c %Xy/  
                     ByRef in_flist() As String ) qFf'RgUtP  
    j}S  
        'Redimension the file list array C6O1ype  
        Erase in_flist RR^I*kRH  
    E}\^GNT  
        'Tracks how many files are found \asF~P  
        Dim fCount As Long ToDN^qE+  
        fCount = 0 Q)HVh[4  
    xdp{y =,[  
        'Recurse directory and search for text files gwR ^Z{  
        Dim f As String JTl 37j  
        f = Dir$(in_dir & "*.txt") q^Oq:l$s  
        While f <> "" Vx-H W;,  
            ReDim Preserve in_flist(fCount) In=3#u ,M  
            in_flist(fCount) = f \w O)w@"  
            fCount += 1 }"Y]GH4Y  
            f = Dir$() -Qqb/y  
        Wend #.a4}ya19  
        ReDim Preserve in_flist(fCount-1) 3"!2C,3c#  
    XQ,I Ej|  
    End Sub 5K{(V^88F  
     
    分享到