切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 741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
    6350
    光币
    25895
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 Qt vYv!  
    0ez(A  
    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。
    3e(ehLc4DJ  
    +-E~6^>  
    背景 2Ry1b+\  
    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。 H,N)4;F<c  
    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。 kWdi59 5  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    EvOJ~'2 Y%  
    Mi]L]-L  
    L[=a/|)TBV  
    步骤 XoA+MuDzpo  
    9 7ql5  
    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。 |=&cQRY!p  
    i+gQE!  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    y#XbJuN/  
    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) yRo- EP  
    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 ?.D3'qv  
    例如下所示: |g=="  
    Sample name:  EDF-C1-56 byv[yGa`  
    Merging data from file EDF-C1-56 0-0.txt Q'%PNrN  
    Finished merging RPC data for sample EDF-C1-56 F^hBtfz  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt vap,y $C  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 G#MdfKH  
    a. 创建一个新的散射库 q7"7U=W0  
    b. 散射模型命名 =+AS/Jq  
    c. 改变散射模型为“Tabulated BSDF”. 92^w8Z.  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Me=CSQqf<  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 h[PYP5{L  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 .|/~op4;  
    g. 点击OK W^s ;Bi+Nw  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 gB<3-J1R  
    ^$ t7+g  
    >Jp:O 7  
    脚本代码 );FJx~b  
    ZcaX'5} !S  
    '#Language "WWB-COM" QR>gt;  
    9]e V?yoA8  
    Option Explicit yrR1[aT  
    Q:5KZm[[  
    Sub Main l&[;rh  
    B9wPU1  
        'Cleanup vBog0KD);s  
        ClearOutputWindow() A\#iXOd  
    G#?Sfn O0  
        Print "Merging RPC Photonics BSDF Data Files" og0*Nt+  
        SetTextColor(255,0,0) Qci4J  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." nB!&Zq  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." aJcf`<p   
        SetTextColor(0,0,0) '{(UW.Awo  
    qM.bF&&Go  
        'Current directory of this script (should be the same as the text files being merged) lv]hTH 4T  
        Dim cDir As String <A# l 35  
        cDir = MacroDir$ & "\" 3"P }n  
    &-mX ,   
        'Array which will be populated with the list of files to be merged !tp1:'KG  
        Dim fList() As String, curFile As String 8KRba4[  
        GetFileList( cDir, fList ) Jej` ;I  
    J.8IwN1E  
        Print "" L@gWzC~?Q  
        Print "Files found for merging:" ##4GK08!  
        For Each curFile In fList #b~JDO(  
            Print Chr(9) & curFile 46 PoM  
        Next ,13Lq-  
    N"3b{Qi o  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. W]nSR RWco  
        Dim nameArray() As String, sampName As String A$w4PVS  
        nameArray = Split(fList(0)," 0-0.txt") PnoPb k[<  
        sampName  = nameArray(0) |M+<m">E  
        Print "" )LyojwY_g  
        Print "Sample name: " & Chr(9) & sampName APO>y  
    rSJ9 v :  
        'Open an output file and write the FRED header data WH= EPOR,  
        Dim outFile As String %wSj%>&-R  
        outFile = cDir & sampName & "_FRED.txt" p1|f<SF')  
        Open outFile For Output As #1 $k2*[sn,  
        Print #1, "type bsdf_data" 3#TV5+x*"`  
        Print #1, "format angles=deg bsdf=value scale=1" AU$Uxwz4  
    D)d~3`=#  
        'Loop the file list, skip the two header lines and write the remaining data to file K5XK%Gl"  
        Dim lineArray() As String, curLine As Long =|YxDas  
        For Each curFile In fList +9") KQT  
            Print "Merging data from file " & curFile r3\cp0P;s  
            ReadFile( cDir & curFile, lineArray ) PZ*pQ=`  
            For curLine = 2 To UBound(lineArray) a(0*um(  
                Print #1, lineArray(curLine) z5r$M  
            Next L*~J%7  
        Next +*hm-lv?  
    f4PIoZ e  
        'Close the output file /, !B2  
        Close #1 G^` 1]?  
    Iwc{R8BV  
        Print "Finished merging RPC data for sample " & sampName [!U?}1YQ  
        Print "FRED formatted data file: " & Chr(9) & outFile Sx8OhUyux  
    End Sub 0eS)&GdR  
    .3MIcj=p  
    'Utility function to read the contents of a file into an array of strings. $9ky{T?YG  
    Function ReadFile(ByVal fileName As String, _ uECsh2Uin  
                      ByRef lineArray() As String) As Long r9ww.PpNk#  
    q2et|QCru  
        ReadFile = -1 NvvUSyk\;s  
        Dim oFSO As Object `IY/9'vT  
        Set oFSO = CreateObject("Scripting.FileSystemObject") L_K=g_]  
        Erase lineArray INyk3`FT  
    }eRD|1  
        Dim fid As Long g=$1cC+(  
        If oFSO.fileexists( fileName ) Then [mPjP%{=@  
            fid = FreeFile() 14"J d\M8  
            Open fileName For Input As fid ?|ZTaX6A  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) as>L[jyG/  
            Close fid #2EI\E&$  
        End If `8Lo{P  
        Set oFSO = Nothing j7)Ao*WN  
        Return UBound( lineArray ) ?:L:EW8  
    qvv2O1c"A  
    End Function T N!=@Gy  
    +fnK /%b  
    Sub GetFileList( ByVal in_dir As String, _ [ l8jRT=R  
                     ByRef in_flist() As String ) rQaxr!  
    \l@,B +)  
        'Redimension the file list array %3$*K\Ai  
        Erase in_flist ]7/ b/J  
    iIP8`! O  
        'Tracks how many files are found K/}rP[H  
        Dim fCount As Long /mK?E5H'r1  
        fCount = 0 FSRj4e1y1  
    eEn;!RS)  
        'Recurse directory and search for text files 4NdN< #Lr  
        Dim f As String 5T:i9h  
        f = Dir$(in_dir & "*.txt") bHI<B)=`  
        While f <> "" +|ycvHd  
            ReDim Preserve in_flist(fCount) edK|NOOZ  
            in_flist(fCount) = f Q pmsOp|  
            fCount += 1 e A}%C.ZR  
            f = Dir$() <$hu   
        Wend 4DOK4{4?5  
        ReDim Preserve in_flist(fCount-1) zH*KYB  
    fks)+L'  
    End Sub EKz Ad  
     
    分享到