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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 -HE@wda  
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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 Ju0W  
    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。 @v#]+9F  
    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。 NrHh(:  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 "kS(b4^  
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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。 $Ur-Q d  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) cZ<@1I5QK  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 }JF,:g Lk  
    例如下所示: '@{'T LMCi  
    Sample name:  EDF-C1-56 T i{~  
    Merging data from file EDF-C1-56 0-0.txt ~{8X$xs  
    Finished merging RPC data for sample EDF-C1-56 LD.^.4{c:  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt p$qpC$F  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 UBgheu  
    a. 创建一个新的散射库 dbmty|d  
    b. 散射模型命名 a*qf\ &Vb|  
    c. 改变散射模型为“Tabulated BSDF”. & 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 ) ?3I93Bt7  
    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。 y<Z-f.  
    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 7sC8|+  
    g. 点击OK THFzC/~Q  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 xu]>TC1  
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    脚本代码 K+`$*vS~ws  
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    '#Language "WWB-COM" lT<4c5 %  
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    Option Explicit Ykt{]#  
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    Sub Main YgeU>I|v  
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        'Cleanup 53i7:1[uV  
        ClearOutputWindow() N ?RJuDW  
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        Print "Merging RPC Photonics BSDF Data Files"  Uu<Tn#nb  
        SetTextColor(255,0,0) o#X=1us  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." SEL7,8 Hm  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." pE^jUxk6  
        SetTextColor(0,0,0) |x Nd^  
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        'Current directory of this script (should be the same as the text files being merged) aDae0$lc.S  
        Dim cDir As String ,.g9HO/R1  
        cDir = MacroDir$ & "\" 9rCvnP=  
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        'Array which will be populated with the list of files to be merged G;'=#c ^  
        Dim fList() As String, curFile As String -f4>4@y  
        GetFileList( cDir, fList ) UTThl2=+  
    ;)SWUXa;{  
        Print "" pYtvenBy  
        Print "Files found for merging:" ,rO>5$w.  
        For Each curFile In fList ~@v<B I  
            Print Chr(9) & curFile ^<}>]F_  
        Next r=`]L-}V  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]xYm@%>6  
        Dim nameArray() As String, sampName As String NY& |:F  
        nameArray = Split(fList(0)," 0-0.txt") Gp PlO]  
        sampName  = nameArray(0) `4&a"`&$  
        Print "" 5W(S~}  
        Print "Sample name: " & Chr(9) & sampName WN_i-A1G/h  
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        'Open an output file and write the FRED header data PN +<C7/  
        Dim outFile As String /=|5YxY  
        outFile = cDir & sampName & "_FRED.txt" .QaHE`e{  
        Open outFile For Output As #1 qXb{A*J  
        Print #1, "type bsdf_data" ckZZ)lW`*  
        Print #1, "format angles=deg bsdf=value scale=1" 9AbSt&#  
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        'Loop the file list, skip the two header lines and write the remaining data to file )Q!3p={S*  
        Dim lineArray() As String, curLine As Long I|{A&G}|q  
        For Each curFile In fList h /.^iT  
            Print "Merging data from file " & curFile p{sbf;-x}  
            ReadFile( cDir & curFile, lineArray ) 9qqzCMrI0e  
            For curLine = 2 To UBound(lineArray) 7n_'2qY  
                Print #1, lineArray(curLine) z ]d^%>Ef  
            Next @`hnp:  
        Next `2j \(N,  
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        'Close the output file pO;BX5(x  
        Close #1 H/eyc`  
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        Print "Finished merging RPC data for sample " & sampName w(y#{!%+  
        Print "FRED formatted data file: " & Chr(9) & outFile )RQX1("O  
    End Sub N~w4|q!]  
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    'Utility function to read the contents of a file into an array of strings. d+6 by,'  
    Function ReadFile(ByVal fileName As String, _ U;QN+fF]u  
                      ByRef lineArray() As String) As Long <MPoDf?h  
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        ReadFile = -1 .hD 2g"  
        Dim oFSO As Object icX$<lD  
        Set oFSO = CreateObject("Scripting.FileSystemObject") <IX)D `mf  
        Erase lineArray %?4 G^f  
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        Dim fid As Long rQ4i%.  
        If oFSO.fileexists( fileName ) Then (4U59<ie  
            fid = FreeFile() q$;'Fy%oy  
            Open fileName For Input As fid R]-$]koQO  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) fO4e[g;G  
            Close fid C&\vVNV;9  
        End If bwo{ Lw~  
        Set oFSO = Nothing dwQ*OxFl  
        Return UBound( lineArray ) (,J`!Y hS  
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    End Function 7Y8B \B)w  
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    Sub GetFileList( ByVal in_dir As String, _ s1[_Pk;!  
                     ByRef in_flist() As String ) 4zF|}aiQ  
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        'Redimension the file list array K{ s=k/h  
        Erase in_flist t*fG;YOg  
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        'Tracks how many files are found $jd>=TU|  
        Dim fCount As Long _t:l:x.;T  
        fCount = 0 &zCqF=/9U  
    r "^ {?0  
        'Recurse directory and search for text files $Qm-p?f  
        Dim f As String :qx>P_&y}z  
        f = Dir$(in_dir & "*.txt") !f(aWrw7e6  
        While f <> "" &wZ ggp  
            ReDim Preserve in_flist(fCount) Kb_R "b3v  
            in_flist(fCount) = f !U,^+"l'GP  
            fCount += 1 8e'0AI_>  
            f = Dir$() =jik33QV<  
        Wend S=Ihg  
        ReDim Preserve in_flist(fCount-1) b&$ ?.z  
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    End Sub (3RU|4Ks  
     
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