切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1294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
    5611
    光币
    22207
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 3U.88{y  
    PQnF  
    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。
    +"cq(Y@  
    ^~@U]  
    背景 NI#:|}CYS  
    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。  TYmP)  
    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{"{5Wb  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    wrbLDod /  
    !QHFg-=7  
    Hh-+/sO~"  
    步骤 {G}.b)9FG  
    pP?MWe Eg  
    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。 -UdEeZz.  
    6c"0})p  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    i2YuOV!  
    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) RHq/JD-  
    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 XKttZOiGT  
    例如下所示: Q6AC(n@:FV  
    Sample name:  EDF-C1-56 rI>aAW'  
    Merging data from file EDF-C1-56 0-0.txt H!nr^l'+  
    Finished merging RPC data for sample EDF-C1-56 zj`v?#ET  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt v<OJ69J  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 B}?5]N==]  
    a. 创建一个新的散射库 , GY h9  
    b. 散射模型命名 qT"Q1xU[  
    c. 改变散射模型为“Tabulated BSDF”. 8p9bCE>\  
    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 ) C\nhqkn  
    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。 jJY"{foWV  
    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 S<u-n8bv  
    g. 点击OK `V"sOTb  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 U{z9>  
    'u_t<F ]b  
    I8/DR z$A  
    脚本代码 RIE5KCrGB  
    bKQ"ax>6p  
    '#Language "WWB-COM" <]4i`6{v  
    T ;vF(  
    Option Explicit xw T%),  
    !Mim@!5M  
    Sub Main 2eC(Ijq[a  
    oiyzHx  
        'Cleanup T[4<R 5}  
        ClearOutputWindow() 92d6U2T4&  
    : G`hm{  
        Print "Merging RPC Photonics BSDF Data Files" '+vA\(K  
        SetTextColor(255,0,0) 8 <7GdCME  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." $m+sNEAa  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." t|<NI+H(e  
        SetTextColor(0,0,0) ^#1.l=s  
    & jczO-R^  
        'Current directory of this script (should be the same as the text files being merged) 0=q;@OIf  
        Dim cDir As String d&u]WVU  
        cDir = MacroDir$ & "\" P*@2.#oO  
    t" 7yNs(I  
        'Array which will be populated with the list of files to be merged Wg0g/  
        Dim fList() As String, curFile As String =;|QZ"%E  
        GetFileList( cDir, fList ) ]oV{t<0a  
    !x>%+&c>k  
        Print "" I}t3 p|z  
        Print "Files found for merging:" r"a5(Q;n  
        For Each curFile In fList .OqSch|  
            Print Chr(9) & curFile ""h)LUrl  
        Next D8nD/||;Z  
    'vq:D$A  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. N, *m ,  
        Dim nameArray() As String, sampName As String U uM$~qf/K  
        nameArray = Split(fList(0)," 0-0.txt") d]i(h~?_  
        sampName  = nameArray(0) RZ7( J  
        Print "" |vMpXiMxxT  
        Print "Sample name: " & Chr(9) & sampName ~+bGN  
    e9Pk"HHl  
        'Open an output file and write the FRED header data 5"]~oPK  
        Dim outFile As String 8kOKwEX  
        outFile = cDir & sampName & "_FRED.txt" EVUq--)~  
        Open outFile For Output As #1 { "xln/  
        Print #1, "type bsdf_data" 0lsXCr_X  
        Print #1, "format angles=deg bsdf=value scale=1" }^*F59>H  
    ]I.n\2R]om  
        'Loop the file list, skip the two header lines and write the remaining data to file |?,[@z _,  
        Dim lineArray() As String, curLine As Long wHv]ViNvXE  
        For Each curFile In fList ;v~-'*0  
            Print "Merging data from file " & curFile he-Ji  
            ReadFile( cDir & curFile, lineArray ) ?D)<,  
            For curLine = 2 To UBound(lineArray) R@yyur~'_(  
                Print #1, lineArray(curLine) ?$Wn!"EC8  
            Next )wtaKF.-  
        Next ^*= 85iyo  
    T y@=yA17  
        'Close the output file (ihP `k-.  
        Close #1 nL}5cPI  
    $1zvgep  
        Print "Finished merging RPC data for sample " & sampName e{9jn>\,a  
        Print "FRED formatted data file: " & Chr(9) & outFile J3b4cxm  
    End Sub 1b>C<\  
    ph|ZG6:  
    'Utility function to read the contents of a file into an array of strings. >A q870n  
    Function ReadFile(ByVal fileName As String, _  ,chf~-d  
                      ByRef lineArray() As String) As Long lhYn5d)DV  
    4Kv[e]10(  
        ReadFile = -1 #Hh^3N  
        Dim oFSO As Object asgF1?r  
        Set oFSO = CreateObject("Scripting.FileSystemObject") tPyyZ#,  
        Erase lineArray zT* .jv  
    0l#)fJo  
        Dim fid As Long @l(vYJ:f  
        If oFSO.fileexists( fileName ) Then Na,_  
            fid = FreeFile() @C-dG7U.P  
            Open fileName For Input As fid rJ'I>Q~x6  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) YEx)"t8E  
            Close fid ;#) mLsl  
        End If ^Ori| 4}'  
        Set oFSO = Nothing 1fL<&G  
        Return UBound( lineArray ) q 'a  
    y8bM<e2 U  
    End Function a)! g7u  
    0ZPV' `KGp  
    Sub GetFileList( ByVal in_dir As String, _ kF V7l  
                     ByRef in_flist() As String ) $O:w(U  
    =`C4qC _  
        'Redimension the file list array Qc{RaMwD  
        Erase in_flist 4oXbPr>  
    .`Zf}[5[  
        'Tracks how many files are found x q-$\#O  
        Dim fCount As Long cQZ652F9  
        fCount = 0 n1:v HBM@\  
    i"^<CR@e  
        'Recurse directory and search for text files y466A]|  
        Dim f As String ^yKY'>T#d  
        f = Dir$(in_dir & "*.txt") gCVryB@z2  
        While f <> "" qturd7  
            ReDim Preserve in_flist(fCount) 7TX,T|>9  
            in_flist(fCount) = f #S+Z$DQD  
            fCount += 1 Cw,D{  
            f = Dir$() M`,XyIn  
        Wend P8gX CX!>U  
        ReDim Preserve in_flist(fCount-1) TQ1WVq }*  
    nyT[^n  
    End Sub xQlT%X;'  
    |AH@ EI>  
    -lRhz!E]  
    QQ:2987619807 _NdLcpBT?  
     
    分享到