切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1648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
    6374
    光币
    26015
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 -{z[.v.p  
    5 I#-h<SG  
    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。
    'dzbeTJ D5  
    yzL9Ic  
    背景  z.2UZ%:  
    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。 M)wNu  
    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。 Q.V@Sawe5  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    42,dHYdt  
    l>BM}hS  
    |DVFi2   
    步骤 Ic&YiATj  
    U%#Vz-r  
    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。 j b'M  
    };Df ><  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    n? =O@yq  
    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) Qn-nO_JL  
    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 R{aqn0M  
    例如下所示: Kg /,  
    Sample name:  EDF-C1-56 $`vXI%|.  
    Merging data from file EDF-C1-56 0-0.txt }&s |~  
    Finished merging RPC data for sample EDF-C1-56 KZ65# UVX  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Gb"kl.j  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 S?D]P'<  
    a. 创建一个新的散射库 V!TGFo}  
    b. 散射模型命名 "^ dMCS@  
    c. 改变散射模型为“Tabulated BSDF”. k{|> !(Ax  
    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 ) qAlX#]  
    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。 d}Y#l}!E6  
    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 <RH%FhT  
    g. 点击OK Zm6jF  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 od,,2pwK+  
    .+u r+" i  
    .]<gm9l  
    脚本代码 jSdC1,wR  
    eE\T,u5:  
    '#Language "WWB-COM" d5{RIM|  
    u'T>Y1I  
    Option Explicit 'b>3:&  
    7[R`52pP  
    Sub Main ).Iifu|ks  
    }y(cv}8Y  
        'Cleanup z t!>  
        ClearOutputWindow() >,)U4 6  
    20Jlf?  
        Print "Merging RPC Photonics BSDF Data Files" K>\v<!%a  
        SetTextColor(255,0,0) C9FAX$$^(Y  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." #0^a-47PA<  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." {aopGu?i  
        SetTextColor(0,0,0) q!h'rX=_-  
    AnZy o a  
        'Current directory of this script (should be the same as the text files being merged) z$/s` |]  
        Dim cDir As String J~ *>pp#U  
        cDir = MacroDir$ & "\" {8%KO1xB  
    `Uvc^  
        'Array which will be populated with the list of files to be merged 3lS1WA   
        Dim fList() As String, curFile As String =dWq B&  
        GetFileList( cDir, fList ) )! k l:  
    `bLJ wJ7  
        Print "" ;vk>k0S  
        Print "Files found for merging:" o?#-Tkb  
        For Each curFile In fList V-63   
            Print Chr(9) & curFile $}0\sj%  
        Next #??[;xjs!  
    :#N]s  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. D7jbo[GgS  
        Dim nameArray() As String, sampName As String kD((1v*D$  
        nameArray = Split(fList(0)," 0-0.txt") %qVD-Jln  
        sampName  = nameArray(0) p<FqK/  
        Print "" f]Rh<N$  
        Print "Sample name: " & Chr(9) & sampName rfh`;G5s  
    =66'33l2  
        'Open an output file and write the FRED header data * COC&  
        Dim outFile As String D|vck1C5,  
        outFile = cDir & sampName & "_FRED.txt" e%=SgXl2t  
        Open outFile For Output As #1 LGYg@DR  
        Print #1, "type bsdf_data" G//hZwf0  
        Print #1, "format angles=deg bsdf=value scale=1" \@{TF((Y  
    _+Pz~_+kS  
        'Loop the file list, skip the two header lines and write the remaining data to file hw B9N  
        Dim lineArray() As String, curLine As Long O`9vEovjs  
        For Each curFile In fList @ykl:K%ke  
            Print "Merging data from file " & curFile =W gzj|Kr  
            ReadFile( cDir & curFile, lineArray ) hSj@<#b>F  
            For curLine = 2 To UBound(lineArray) fUq #mkq}  
                Print #1, lineArray(curLine) W*u$e8i7  
            Next $+U 6c~^^  
        Next +h1X-K:I  
    -AB0uMot  
        'Close the output file tU.~7f#+A  
        Close #1 m:9|5W  
    Y7')~C`up^  
        Print "Finished merging RPC data for sample " & sampName 4S* X=1  
        Print "FRED formatted data file: " & Chr(9) & outFile 8 9maN  
    End Sub ]r\!Z <<(  
    3/,}&SX  
    'Utility function to read the contents of a file into an array of strings. m mH xPd  
    Function ReadFile(ByVal fileName As String, _ $OzVo&P;  
                      ByRef lineArray() As String) As Long jK{qw  
    M>{*PHze0  
        ReadFile = -1 4(`U]dNcs  
        Dim oFSO As Object jq_ i&~S  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 2r@9|}La  
        Erase lineArray M'pIAm1p  
    P<LmCY m  
        Dim fid As Long 59X XmVg  
        If oFSO.fileexists( fileName ) Then vm =d?*cR  
            fid = FreeFile() tLP Er@  
            Open fileName For Input As fid 0~Xt_rN](  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) y#/P||PM  
            Close fid +$#h6V  
        End If "EZpTy}Ee  
        Set oFSO = Nothing Ieh<|O,-C  
        Return UBound( lineArray ) xO4""/ n  
     $3cZS  
    End Function HNLr} Yj  
    !L2!:_  
    Sub GetFileList( ByVal in_dir As String, _ mH)8A+us  
                     ByRef in_flist() As String ) UMK9[Iy$<M  
    DbYnd%k*4  
        'Redimension the file list array xZVZYvC,t  
        Erase in_flist #@E:|^$1y  
     I*n]8c  
        'Tracks how many files are found tHr4/  
        Dim fCount As Long VKSn \HT~  
        fCount = 0 x4v&%d=M  
    @h/-P'Lc=7  
        'Recurse directory and search for text files dt/-0~U  
        Dim f As String B) dG:~  
        f = Dir$(in_dir & "*.txt") 8= g~+<A  
        While f <> "" & s:\t L  
            ReDim Preserve in_flist(fCount) Y3SV6""y/  
            in_flist(fCount) = f $v5 >6+-n  
            fCount += 1 S#Tu/2<}  
            f = Dir$() |<uBJ-5  
        Wend :`uu[^  
        ReDim Preserve in_flist(fCount-1) JkKbw&65  
    gLK0L%"5  
    End Sub tqjjn5!  
    }]^/`n  
    UUF]45t>  
    QQ:2987619807 Tt,T6zs- <  
     
    分享到