切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 270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
    6511
    光币
    26700
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2025-07-22
    摘要 b>07t!;  
    o<Zlm)"%1  
    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。
    v Y[s#*+  
    2)f_L|o,m  
    背景 Y Zj-%5  
    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。 X0.H(p#s  
    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~>(XG[x&  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    (T%F^s5D  
    #A/OGi  
    hFIh<m=C?Y  
    步骤 v)5;~.+%  
    vzIo2 ,/7  
    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。 H/D=$)3op  
    P<]U  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    t+?Bb7p,H  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) N<)CG,/w[M  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 2 2v"?*  
    例如下所示: \dk1a  
    Sample name:  EDF-C1-56 @;/Pl>$|'G  
    Merging data from file EDF-C1-56 0-0.txt l9.`2d]o  
    Finished merging RPC data for sample EDF-C1-56 :U?g']`Z##  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt A!lZyG!3  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 E|@C:ghG  
    a. 创建一个新的散射库 KdEvu?  
    b. 散射模型命名 (!}N&!t  
    c. 改变散射模型为“Tabulated BSDF”. cIU2qFn[  
    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 ) HMq}){=S  
    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。 h"`\'(,X  
    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 uMcI'=  
    g. 点击OK N^;lp<{6?  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 C[^VM$  
    `^)`J  
    S@qPf0dL<  
    脚本代码 J}V4.R5d  
    G@7^M}  
    '#Language "WWB-COM" 7P{= Pv+  
    5{! fa  
    Option Explicit w~]2c{\Qz  
    .eJKIck  
    Sub Main /$; Z ~^P  
    }i+C)VUX   
        'Cleanup .O- )m'5  
        ClearOutputWindow() f.g!~wGD  
    6qZQ20h  
        Print "Merging RPC Photonics BSDF Data Files" 3p#UEH3  
        SetTextColor(255,0,0) 7ZUN;mr  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ().C  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." -h8mJ D%Oi  
        SetTextColor(0,0,0) maa pX/J  
    } %3;j5 ;6  
        'Current directory of this script (should be the same as the text files being merged) B4OFhtYE  
        Dim cDir As String !rx5i  
        cDir = MacroDir$ & "\" $1X !Ecq_  
    ~Q- /O~  
        'Array which will be populated with the list of files to be merged .:-*89c  
        Dim fList() As String, curFile As String jcePSps]  
        GetFileList( cDir, fList ) sVO|Ghy65  
    jp-(n z\  
        Print "" }m!T~XR</  
        Print "Files found for merging:" BT:b&"AR[  
        For Each curFile In fList /0L]Pf;  
            Print Chr(9) & curFile ^(*eoe  
        Next ~ LH).\V  
    m=`V  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. %*L8W*V  
        Dim nameArray() As String, sampName As String $9@Z\0   
        nameArray = Split(fList(0)," 0-0.txt") p,4S?c r>a  
        sampName  = nameArray(0) AfW:'>2  
        Print "" j97c@  
        Print "Sample name: " & Chr(9) & sampName nQw, /L k  
    "t{D5{q|[k  
        'Open an output file and write the FRED header data q|.0Ja  
        Dim outFile As String Dhft[mvo  
        outFile = cDir & sampName & "_FRED.txt" (Q"s;g  
        Open outFile For Output As #1 Zf)<)o*  
        Print #1, "type bsdf_data" Kt#X'!9/<  
        Print #1, "format angles=deg bsdf=value scale=1" eET1f8 B=L  
    -OQ6;A"#  
        'Loop the file list, skip the two header lines and write the remaining data to file t-FrF</ 0  
        Dim lineArray() As String, curLine As Long %H"AHkge:a  
        For Each curFile In fList En+`ZcA\z  
            Print "Merging data from file " & curFile !&8B8jHqA  
            ReadFile( cDir & curFile, lineArray ) O sIvW'$\  
            For curLine = 2 To UBound(lineArray) Xt*h2&  
                Print #1, lineArray(curLine) S?H qrf7<  
            Next =HoA2,R)  
        Next 7*&q"   
    ;;17 #T2  
        'Close the output file ]T<RC\o  
        Close #1 4!+IsT  
    #w[Ie+  
        Print "Finished merging RPC data for sample " & sampName C It@xi#I  
        Print "FRED formatted data file: " & Chr(9) & outFile orF8%  
    End Sub %?`$#*f\%  
    v3/G.B@=  
    'Utility function to read the contents of a file into an array of strings. u_)'}  
    Function ReadFile(ByVal fileName As String, _ :2&W9v  
                      ByRef lineArray() As String) As Long !uHVg(}  
    K30{Fcb< h  
        ReadFile = -1 {Pi]i?   
        Dim oFSO As Object ADZU?7)  
        Set oFSO = CreateObject("Scripting.FileSystemObject") \g;-q9g;O  
        Erase lineArray \H?r[]*c%  
    SQBe}FlktK  
        Dim fid As Long XgZ.UT  
        If oFSO.fileexists( fileName ) Then pL'+sW  
            fid = FreeFile() i\k>2df  
            Open fileName For Input As fid 8z"*CJ@  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2G`tS=Un  
            Close fid [RUYH5>Ik  
        End If *p%=u>?&  
        Set oFSO = Nothing 6SD9lgF*-  
        Return UBound( lineArray ) @X>Oj.  
    =I9RM9O<  
    End Function *1b)Va8v*  
    (f t$ R?  
    Sub GetFileList( ByVal in_dir As String, _ }7|UA%xz  
                     ByRef in_flist() As String ) _"c?[n  
    f>_' ]eM%  
        'Redimension the file list array w ]$Hr   
        Erase in_flist @ **]o  
    KP]{=~(  
        'Tracks how many files are found ?,x3*'-(  
        Dim fCount As Long kC-OZVoO  
        fCount = 0 0h~7"qUF@  
    +/~;y{G..z  
        'Recurse directory and search for text files  [E|%  
        Dim f As String <-m[0zg q  
        f = Dir$(in_dir & "*.txt") *5|q_K Pt  
        While f <> "" ;JQ;LbEn  
            ReDim Preserve in_flist(fCount) e47N9&4  
            in_flist(fCount) = f uz;z+Bd^  
            fCount += 1 =?g B@vS  
            f = Dir$() %Y//}  
        Wend nhPua&  
        ReDim Preserve in_flist(fCount-1) S+&Bf ~~D  
    EG[Rda  
    End Sub wLz@u$u?  
     
    分享到