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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 G;AV~1i:~  
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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 VmTgD96  
    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。 >DR/ lBtL  
    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。 M[&p[P@  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ,j[1!*Z_[  
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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。 ">R`S<W  
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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) *18J$  
    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 EJ Ta~  
    例如下所示: (/J %Huy  
    Sample name:  EDF-C1-56 No w2ad&  
    Merging data from file EDF-C1-56 0-0.txt ~#JX 0J=  
    Finished merging RPC data for sample EDF-C1-56 <kWNx.eci  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt  bzX/Zts  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 rK cr1VFy  
    a. 创建一个新的散射库 \ id(P3M  
    b. 散射模型命名 8t& 'Yk  
    c. 改变散射模型为“Tabulated BSDF”. yc@ :*Z  
    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 ) KRj3??b  
    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。 j!?bE3r~  
    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 `AELe_  
    g. 点击OK ko T: r  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ! 9=Y(rb  
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    脚本代码 X#u< 3<P  
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    '#Language "WWB-COM" cN#f$  
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    Option Explicit jD_B&MQz  
    #0/^v*  
    Sub Main ~ouRDO  
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        'Cleanup -<q@0IYyi  
        ClearOutputWindow() @-}!o&G0  
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        Print "Merging RPC Photonics BSDF Data Files" _K|?;j#x0k  
        SetTextColor(255,0,0) !o/;"'&E  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." .h;X5q1  
        Print "Note: Do not run this script multiple times without deleting the output file between executions."  1O@ cev;  
        SetTextColor(0,0,0) 8'mm<BV;sT  
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        'Current directory of this script (should be the same as the text files being merged) Fk&A2C}$b  
        Dim cDir As String ~2?UEv6  
        cDir = MacroDir$ & "\" %'[ pucEF  
    %{";RfSVX%  
        'Array which will be populated with the list of files to be merged #'h(o/hz&&  
        Dim fList() As String, curFile As String =zKbvwe%X  
        GetFileList( cDir, fList ) ZUeA&&{  
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        Print "" 3x~AaC.j  
        Print "Files found for merging:" <fcw:Ae  
        For Each curFile In fList 7:h_U9Za?$  
            Print Chr(9) & curFile .[X"+i\  
        Next 8]0?mV8iOE  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Qx !! Ttd{  
        Dim nameArray() As String, sampName As String V@1K  
        nameArray = Split(fList(0)," 0-0.txt") I}7= \S/@  
        sampName  = nameArray(0) . aqP=  
        Print "" Zl`sY5{1  
        Print "Sample name: " & Chr(9) & sampName I'16-  
    7)+%;|~  
        'Open an output file and write the FRED header data Pr^p ^s  
        Dim outFile As String .FAuM~_99b  
        outFile = cDir & sampName & "_FRED.txt" {:d9q  
        Open outFile For Output As #1 dq$C COC^F  
        Print #1, "type bsdf_data" G,b1u"  
        Print #1, "format angles=deg bsdf=value scale=1" <\5Y~!)  
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        'Loop the file list, skip the two header lines and write the remaining data to file ,4z?9@wQ  
        Dim lineArray() As String, curLine As Long yzmwNsu  
        For Each curFile In fList AehkEN&H/t  
            Print "Merging data from file " & curFile ^5![tTJ  
            ReadFile( cDir & curFile, lineArray ) H(Q|qckj  
            For curLine = 2 To UBound(lineArray) H) &pay  
                Print #1, lineArray(curLine) LC:bHM, e  
            Next /Q[M2DN@  
        Next Pxm~2PAm  
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        'Close the output file az ?2  
        Close #1 )IP{yL8c  
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        Print "Finished merging RPC data for sample " & sampName p~THliwd  
        Print "FRED formatted data file: " & Chr(9) & outFile XZ8;Ow=  
    End Sub L]HYk}oD.  
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    'Utility function to read the contents of a file into an array of strings. Ev;ocb,  
    Function ReadFile(ByVal fileName As String, _ ZM%z"hO9R  
                      ByRef lineArray() As String) As Long R]{AJ"p  
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        ReadFile = -1 B>&eciY  
        Dim oFSO As Object ku}I; k |  
        Set oFSO = CreateObject("Scripting.FileSystemObject") b,#E.%SLw  
        Erase lineArray Qvd$fY**  
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        Dim fid As Long )pXw 3Fo  
        If oFSO.fileexists( fileName ) Then = A !;`G  
            fid = FreeFile() 1y5$  
            Open fileName For Input As fid ;hLne0|)}  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~:%rg H  
            Close fid MrA&xM  
        End If 7+I2" Hy  
        Set oFSO = Nothing &`'gO 9  
        Return UBound( lineArray ) ^L<*ggw  
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    End Function k98}Jx7J)"  
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    Sub GetFileList( ByVal in_dir As String, _ o= %Fh  
                     ByRef in_flist() As String ) '.wyfSH@  
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        'Redimension the file list array 9)qjW&`  
        Erase in_flist 1Bz'$u;  
    &,Xs=Lv mq  
        'Tracks how many files are found $v6dB {%Qu  
        Dim fCount As Long Z<#beT6  
        fCount = 0 THmX=K4=?  
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        'Recurse directory and search for text files \8!&X cA  
        Dim f As String ZC1U  
        f = Dir$(in_dir & "*.txt") ?eb2T`\0Q  
        While f <> "" >, &6zj  
            ReDim Preserve in_flist(fCount) ;Db89Nc$  
            in_flist(fCount) = f snBC +`-  
            fCount += 1 O>Nop5#o  
            f = Dir$() %L./U$  
        Wend pAV}hB  
        ReDim Preserve in_flist(fCount-1) s.rS06x  
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    End Sub g'`J'6Pn  
     
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