切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 608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
    5797
    光币
    23137
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 M>@PRb:Oc  
    x6 h53R  
    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。
    4J$dG l#f  
    T,v5cc:nO  
    背景 &P gk$e%>  
    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。 3q`Uq`t4mR  
    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。 3s_$.  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    cfPQcB>A  
    1#nY Z%  
    9+:<RFJ  
    步骤 g3\1 3<  
    # 0/,teJ k  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 5>rjL ;  
    S|T*-?|  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    x.>[A^  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) R3E|seR  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 IUQYoKz4}A  
    例如下所示: QVWUm!  
    Sample name:  EDF-C1-56 [k7 ;^A5/  
    Merging data from file EDF-C1-56 0-0.txt PAv<J<d  
    Finished merging RPC data for sample EDF-C1-56 y_{v&AGmgm  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n;~6'f xe  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 `+GiSj8'G  
    a. 创建一个新的散射库 Tywrh9[  
    b. 散射模型命名 Klqte*!  
    c. 改变散射模型为“Tabulated BSDF”. 4,:)%KB"V  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) VBe&of+  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 gdG#;T'  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 ' y_2"  
    g. 点击OK }K9Ji]tOK:  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .< -~k@ P  
    Lq{/r+tt/  
    #v:A-u  
    脚本代码 wyv%c/WlS  
    q8 Rep  
    '#Language "WWB-COM" OCI{)r<O2m  
    YG>6;g)Zm  
    Option Explicit gBo~NLrf  
    . "`f~s\G  
    Sub Main wO"ezQ  
    2 m2$jp0  
        'Cleanup TV(%e4U=  
        ClearOutputWindow() !&Us^Q^  
    +!"7=?}  
        Print "Merging RPC Photonics BSDF Data Files" (t"rzH  
        SetTextColor(255,0,0) s7:w>,v/  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." }xytV5a^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." "oT]_WHqo  
        SetTextColor(0,0,0) PsI{y&.  
    !24g_R[3"  
        'Current directory of this script (should be the same as the text files being merged) 'd9cCQ}  
        Dim cDir As String (.~'\@  
        cDir = MacroDir$ & "\" &%@>S.  
    Q&?B^[N*Q  
        'Array which will be populated with the list of files to be merged &Y$)s<u8.  
        Dim fList() As String, curFile As String DWu~%U8  
        GetFileList( cDir, fList ) ~)]n67Or~  
    /5C>7BC  
        Print "" Ct}rj-L<i  
        Print "Files found for merging:" `}*jjnr"  
        For Each curFile In fList 7kQ,D,c'  
            Print Chr(9) & curFile +(vL ~  
        Next |p":s3K"Hy  
    <& =3g/Y  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. &Ef6'  
        Dim nameArray() As String, sampName As String 8:}$L)[V  
        nameArray = Split(fList(0)," 0-0.txt") 0coRar?+b  
        sampName  = nameArray(0) SRc|9W5t*J  
        Print "" H9rZWc"*  
        Print "Sample name: " & Chr(9) & sampName u %&4[zb  
    j'&a)-Wx_  
        'Open an output file and write the FRED header data RX\@fmK&  
        Dim outFile As String ;%xG bg!lg  
        outFile = cDir & sampName & "_FRED.txt" /n#t.XJY*  
        Open outFile For Output As #1 kF7`R4Sz  
        Print #1, "type bsdf_data" {;?bC'  
        Print #1, "format angles=deg bsdf=value scale=1" StM)lVeF  
    ?XO}6q<tM  
        'Loop the file list, skip the two header lines and write the remaining data to file ]=m0@JTbG  
        Dim lineArray() As String, curLine As Long 'K3%@,O  
        For Each curFile In fList <zF/at  
            Print "Merging data from file " & curFile }o9(Q8  
            ReadFile( cDir & curFile, lineArray ) <N\#6m  
            For curLine = 2 To UBound(lineArray) _@ @"'  
                Print #1, lineArray(curLine) \DRYqLT`  
            Next Gm'Ch}E  
        Next _CXXgF[OCA  
    s&Qil07 Vl  
        'Close the output file K2t|d[r  
        Close #1 ?&r >`H E  
    _JXb|FIp  
        Print "Finished merging RPC data for sample " & sampName S:xG:[N@  
        Print "FRED formatted data file: " & Chr(9) & outFile 5 }F6s  
    End Sub PVUNi: h  
    C$fQ[@  
    'Utility function to read the contents of a file into an array of strings. m4kUA"n5  
    Function ReadFile(ByVal fileName As String, _ sK`pV8&xq  
                      ByRef lineArray() As String) As Long [[d@P%X&  
    E 9n7P'8  
        ReadFile = -1 &1,qC,:!  
        Dim oFSO As Object 3W}xYYs] ^  
        Set oFSO = CreateObject("Scripting.FileSystemObject") T1pMe{  
        Erase lineArray 3 Ho<4_I,  
    Sh RkL<  
        Dim fid As Long h5R5FzY0&  
        If oFSO.fileexists( fileName ) Then ppo\cy;  
            fid = FreeFile() B=J/HiwV)  
            Open fileName For Input As fid OgB ZoTT  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) @X*r5hjc  
            Close fid k84JDPu#  
        End If &li&P5!i  
        Set oFSO = Nothing e8<[2J)P&  
        Return UBound( lineArray )  <IL$8a  
    R^F\2yth-  
    End Function WXC}Ie  
    NX4}o&mDwn  
    Sub GetFileList( ByVal in_dir As String, _ j=,]b6(  
                     ByRef in_flist() As String ) [sH[bmLR  
    k!6wVJ|_Y  
        'Redimension the file list array )0NE_AZ?  
        Erase in_flist S vR? nN|  
    k,nRC~Irh  
        'Tracks how many files are found 5UHxB"`C  
        Dim fCount As Long Nm]\0m0p-  
        fCount = 0 ;qT7BUh(%  
    gKGM|0u|r  
        'Recurse directory and search for text files E-q*u(IW  
        Dim f As String l+1GA0'JP  
        f = Dir$(in_dir & "*.txt")  p%6j2;D  
        While f <> "" Q.G6 y,KR  
            ReDim Preserve in_flist(fCount) sS|N.2*  
            in_flist(fCount) = f I*^3 Z  
            fCount += 1 *T'>-nm]  
            f = Dir$() L'Fy\K\  
        Wend g+98G8 R  
        ReDim Preserve in_flist(fCount-1) <C9_5C e~  
    Hc{0O7  
    End Sub h .Iscr^~  
     
    分享到