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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 fZ5zsm'N  
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    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。
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    背景 N a $eeM  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 _*m<Z;Et  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 .;$Ub[  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 rijavZS6  
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    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。 @?vC4+'  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    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) 9Gc4mwu  
    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 6D&{+;  
    例如下所示: wr-/R"fX  
    Sample name:  EDF-C1-56 =f/CBYNw@V  
    Merging data from file EDF-C1-56 0-0.txt 2t[P-on  
    Finished merging RPC data for sample EDF-C1-56 4Y5lP00!}  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |W#(+m  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 j"F?^0aR,Q  
    a. 创建一个新的散射库 \5iMr[s  
    b. 散射模型命名 1)o6jGQ  
    c. 改变散射模型为“Tabulated BSDF”. QJ,[K _  
    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 ) \]8 F_K  
    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。 bt{b%r  
    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 e~U]yg5X-  
    g. 点击OK \'Q rJ ?D  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 U #C@&2  
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    脚本代码 J6I:UML  
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    '#Language "WWB-COM" )! eJW(  
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    Option Explicit f OasX!=  
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    Sub Main dfP4SJqq  
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        'Cleanup = ;cTm5d;T  
        ClearOutputWindow() z ub"Ap3  
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        Print "Merging RPC Photonics BSDF Data Files" Uv m:`e~?  
        SetTextColor(255,0,0) ?KtF!:_C  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." (Z0_e&=*  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." g\% Z+Dc  
        SetTextColor(0,0,0) I`f5)iF?0  
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        'Current directory of this script (should be the same as the text files being merged) 5%%e$o+  
        Dim cDir As String z"97AXu  
        cDir = MacroDir$ & "\" T-LX>*  
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        'Array which will be populated with the list of files to be merged ysj5/wtO0  
        Dim fList() As String, curFile As String bp!Jjct  
        GetFileList( cDir, fList ) Vel}lQD  
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        Print "" 4{@{VsXN  
        Print "Files found for merging:" q{ [!" ,  
        For Each curFile In fList e\em;GTy  
            Print Chr(9) & curFile `*l aUn  
        Next +CM>]Ze  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )ViBH\.*p  
        Dim nameArray() As String, sampName As String L>h|1ZK  
        nameArray = Split(fList(0)," 0-0.txt") =C2KHNc  
        sampName  = nameArray(0) _%[po%]  
        Print "" [j}JCmWY   
        Print "Sample name: " & Chr(9) & sampName :r>^^tGT!  
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        'Open an output file and write the FRED header data 57~y 7/0  
        Dim outFile As String 1<Sg@  
        outFile = cDir & sampName & "_FRED.txt" &7i&"TNptP  
        Open outFile For Output As #1 Z5E; FGPb  
        Print #1, "type bsdf_data" P6&%`$  
        Print #1, "format angles=deg bsdf=value scale=1" 1uO2I&B  
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        'Loop the file list, skip the two header lines and write the remaining data to file ftG3!}  
        Dim lineArray() As String, curLine As Long ;=7K*npT  
        For Each curFile In fList &s(J:P$!  
            Print "Merging data from file " & curFile d:k n%L6k_  
            ReadFile( cDir & curFile, lineArray ) QgI[#d{  
            For curLine = 2 To UBound(lineArray) !> =ybRe  
                Print #1, lineArray(curLine) [~u&#!*W  
            Next ruQt0q,W3%  
        Next - V:HT j  
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        'Close the output file lXg5UrW  
        Close #1 D<m0G]Ht*  
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        Print "Finished merging RPC data for sample " & sampName 5f{P% x(  
        Print "FRED formatted data file: " & Chr(9) & outFile |{&M#qXe  
    End Sub {fnx=BaG  
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    'Utility function to read the contents of a file into an array of strings. zs~Tu  
    Function ReadFile(ByVal fileName As String, _ #1/~eIEY  
                      ByRef lineArray() As String) As Long \n t~K}a  
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        ReadFile = -1 Z6rhInIY  
        Dim oFSO As Object j)2I+[aoB  
        Set oFSO = CreateObject("Scripting.FileSystemObject") f4fBUZ^ A  
        Erase lineArray Lo~ ;pvv  
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        Dim fid As Long 'S1u@p,q  
        If oFSO.fileexists( fileName ) Then :{2~s  
            fid = FreeFile() o]~\u{o#.  
            Open fileName For Input As fid Km;}xke6  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) +rJ6DZ  
            Close fid <(q(5jG  
        End If  #D4  
        Set oFSO = Nothing QXZyiJX}  
        Return UBound( lineArray ) p_h/hTi  
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    End Function Bl*}*SPU  
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    Sub GetFileList( ByVal in_dir As String, _ X3\PVsH$K  
                     ByRef in_flist() As String ) "~5cz0 H3v  
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        'Redimension the file list array H; NV?CD  
        Erase in_flist R7/S SuG6\  
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        'Tracks how many files are found `^Vd*  
        Dim fCount As Long n&njSj/  
        fCount = 0 )Cl>%9  
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        'Recurse directory and search for text files uhh7Ft#H  
        Dim f As String )A$"COM4  
        f = Dir$(in_dir & "*.txt") mUa#sTm  
        While f <> "" &h0LWPl  
            ReDim Preserve in_flist(fCount) b)<WC$"  
            in_flist(fCount) = f N<9 c/V  
            fCount += 1 l!f_ +lv  
            f = Dir$() +Yc^w5 !(  
        Wend /[<F f  
        ReDim Preserve in_flist(fCount-1) v-tI`Qpb  
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    End Sub `9co7[Z  
     
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