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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 UOb` @#  
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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 >@7$=Y>D  
    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。 f-18nF7{  
    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。 x3i}IC  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Xf4~e(O  
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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。 D% jGK  
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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) $z[S0Cm  
    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 1 tOslP@  
    例如下所示: qFWN._R  
    Sample name:  EDF-C1-56 <8}FsRr;J  
    Merging data from file EDF-C1-56 0-0.txt B>nj{W<o  
    Finished merging RPC data for sample EDF-C1-56 t,r]22I,`  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt D^4nT,&8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 36Lkcda[  
    a. 创建一个新的散射库 q;,lv3I  
    b. 散射模型命名 G%sq;XT61  
    c. 改变散射模型为“Tabulated BSDF”. \2kLj2!  
    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 ) !'H$08Ql}  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 2VRGTx  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 u9~5U9]O%6  
    g. 点击OK \96\!7$@O  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .=;IdLO,Bf  
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    脚本代码 (T*$4KGV  
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    '#Language "WWB-COM" Y'iI_cg  
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    Option Explicit 2 `>a(  
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    Sub Main l$&~(YE f  
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        'Cleanup 8;?4rrS  
        ClearOutputWindow() +vy fhw4  
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        Print "Merging RPC Photonics BSDF Data Files" GqHW.s5  
        SetTextColor(255,0,0) %_W4\  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." :V.@:x>id  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." |^l_F1+w  
        SetTextColor(0,0,0) mcQL>7ts  
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        'Current directory of this script (should be the same as the text files being merged) }O*`I(  
        Dim cDir As String qS\#MMsTd  
        cDir = MacroDir$ & "\" '$OUe {j<  
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        'Array which will be populated with the list of files to be merged J- S.m(  
        Dim fList() As String, curFile As String }T4|Kyu?  
        GetFileList( cDir, fList ) i*=~m O8E  
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        Print "" ~uc7R/3ss  
        Print "Files found for merging:" d 5yEgc;z  
        For Each curFile In fList ZMQ=D!kT  
            Print Chr(9) & curFile . f_ A%  
        Next GS>[A b+  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. jn5xYKv  
        Dim nameArray() As String, sampName As String nx'c=gp  
        nameArray = Split(fList(0)," 0-0.txt") d[_26.  
        sampName  = nameArray(0) zzZ EX  
        Print "" gQr+ ~O  
        Print "Sample name: " & Chr(9) & sampName tle`O)&uo  
    }AS/^E  
        'Open an output file and write the FRED header data #Kb /tOp1  
        Dim outFile As String i"G'#n~e  
        outFile = cDir & sampName & "_FRED.txt" B)Y[~4o  
        Open outFile For Output As #1 %C_tBNE <  
        Print #1, "type bsdf_data" R `tJ7MB  
        Print #1, "format angles=deg bsdf=value scale=1" 2'@m'4-N  
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        'Loop the file list, skip the two header lines and write the remaining data to file fF)Q;~_VA  
        Dim lineArray() As String, curLine As Long N_T5sZ\  
        For Each curFile In fList S-Y{Vi"2  
            Print "Merging data from file " & curFile T2Yf7Szp  
            ReadFile( cDir & curFile, lineArray ) Z i6s0Uck  
            For curLine = 2 To UBound(lineArray) x{:U$[_  
                Print #1, lineArray(curLine) m,Y/ke\  
            Next z&gma Ywq  
        Next FY'0?CT$  
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        'Close the output file K[y")ooE<j  
        Close #1 ts~VO`  
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        Print "Finished merging RPC data for sample " & sampName 8lV:-"+5  
        Print "FRED formatted data file: " & Chr(9) & outFile #tR:W?!  
    End Sub Rv&"h_"t  
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    'Utility function to read the contents of a file into an array of strings. NwF"Zh5eMW  
    Function ReadFile(ByVal fileName As String, _ nNCR5&,q  
                      ByRef lineArray() As String) As Long D;!sH?J@+  
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        ReadFile = -1 naaKAZ!S  
        Dim oFSO As Object st) is4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") iL;V5|(sb  
        Erase lineArray j~N*TXkC  
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        Dim fid As Long |1%% c %  
        If oFSO.fileexists( fileName ) Then :Tpf8  
            fid = FreeFile() sLA.bp.O  
            Open fileName For Input As fid %AO6 =  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) r4mh:T4i  
            Close fid []A9j ?_w  
        End If U:*rlA@_.  
        Set oFSO = Nothing ?r !kKMZ  
        Return UBound( lineArray ) kx(beaf  
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    End Function [k$GUU,jY  
    %:~Ah6R1  
    Sub GetFileList( ByVal in_dir As String, _ gg`{kN^r.a  
                     ByRef in_flist() As String ) %d+Fq=<  
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        'Redimension the file list array 'b.jKkW7  
        Erase in_flist Xgx/ubca0  
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        'Tracks how many files are found W_wC"?A%  
        Dim fCount As Long iOZ9A~Ywy  
        fCount = 0 Kk}, PU=  
    K.yc[z)un  
        'Recurse directory and search for text files *R+M#l9D`  
        Dim f As String ={xRNNUj_  
        f = Dir$(in_dir & "*.txt") _-vlN  
        While f <> "" DPf].i#  
            ReDim Preserve in_flist(fCount) K ar!  
            in_flist(fCount) = f %/3+:}@G  
            fCount += 1 WuE]pm]c  
            f = Dir$() uM$b/3%s  
        Wend MX]#|hEeQ  
        ReDim Preserve in_flist(fCount-1) N[Xm5J  
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    End Sub <*J"6x  
     
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