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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 6ll!7U(9(  
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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 6H|1IrG  
    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。 S;4:`?s=i  
    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。 i$NlS}W  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 9nR\7!_  
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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。 ZJ3g,dc  
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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) #8Bh5L!SJ1  
    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 ~nA k-toJ  
    例如下所示: *2h%dT:,%  
    Sample name:  EDF-C1-56 httywa^  
    Merging data from file EDF-C1-56 0-0.txt }Ulxt:}   
    Finished merging RPC data for sample EDF-C1-56 :8`A  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 1'&.6{)P  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 IR-n:z  
    a. 创建一个新的散射库 [lzd'  
    b. 散射模型命名 g<Z :`00|  
    c. 改变散射模型为“Tabulated BSDF”. $7q3[skH  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) "<iH8MzZ  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 s!IIvF  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4Fg2/O_3  
    g. 点击OK b6-N2F1Fs  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Yc7 YNC.  
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    脚本代码 *D|a`R!Y  
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    '#Language "WWB-COM" `G$>T#Dq  
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    Option Explicit RBQ8+^  
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    Sub Main .lcp5D[(  
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        'Cleanup 19$A!kH\  
        ClearOutputWindow() pA!-spgX  
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        Print "Merging RPC Photonics BSDF Data Files" c!\Gj|  
        SetTextColor(255,0,0) ]?}>D?5  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." @_do<'a  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." JVoC2Z<  
        SetTextColor(0,0,0) uU^DYgs  
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        'Current directory of this script (should be the same as the text files being merged) HTL6;87w+]  
        Dim cDir As String &qbEF3p^@  
        cDir = MacroDir$ & "\" it}h8:^<  
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        'Array which will be populated with the list of files to be merged ]o'o v  
        Dim fList() As String, curFile As String 9VW/Af  
        GetFileList( cDir, fList ) e* [wF}))  
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        Print "" -m^- p  
        Print "Files found for merging:" <1*kXTN(  
        For Each curFile In fList E^)FnXe5  
            Print Chr(9) & curFile Z:{| ?4  
        Next `Abd=1nH  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9G[ DuYJI  
        Dim nameArray() As String, sampName As String k7U.]#5V  
        nameArray = Split(fList(0)," 0-0.txt") IP`lx  
        sampName  = nameArray(0) <N)!s&D  
        Print "" Z=&|__ +d  
        Print "Sample name: " & Chr(9) & sampName ^os_j39N9  
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        'Open an output file and write the FRED header data 1WtE] D  
        Dim outFile As String Q^ W,)%  
        outFile = cDir & sampName & "_FRED.txt" <,:{Q75  
        Open outFile For Output As #1 :u7BCV|yr  
        Print #1, "type bsdf_data" Ts.2\-+3  
        Print #1, "format angles=deg bsdf=value scale=1" DZqG7p$u4i  
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        'Loop the file list, skip the two header lines and write the remaining data to file l9 \W=-'  
        Dim lineArray() As String, curLine As Long @@H/q  
        For Each curFile In fList h3 H Udu  
            Print "Merging data from file " & curFile o<5`uV!f  
            ReadFile( cDir & curFile, lineArray ) .'`aX 7{\  
            For curLine = 2 To UBound(lineArray) 2q[pOT'k  
                Print #1, lineArray(curLine) My>q%lF=fw  
            Next 48 -j  
        Next %1 )c{7  
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        'Close the output file pEwo}NS*H  
        Close #1 2{j$1EdI@-  
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        Print "Finished merging RPC data for sample " & sampName vN(~}gOd\  
        Print "FRED formatted data file: " & Chr(9) & outFile >T;!Z5L1  
    End Sub y^H5iB[SPL  
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    'Utility function to read the contents of a file into an array of strings. IFBt#]l0  
    Function ReadFile(ByVal fileName As String, _ <Z.`X7]Uk  
                      ByRef lineArray() As String) As Long .'=S1|_(  
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        ReadFile = -1 vP,pK=5  
        Dim oFSO As Object N~]qQ oj,  
        Set oFSO = CreateObject("Scripting.FileSystemObject") w!"A$+~  
        Erase lineArray :? )!yI  
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        Dim fid As Long 9<3(  QR  
        If oFSO.fileexists( fileName ) Then $*eYiz3Ue  
            fid = FreeFile() f2c <-}wR  
            Open fileName For Input As fid F9LKO3Rh#u  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 5:r AWq  
            Close fid U LS>v  
        End If {- I+  
        Set oFSO = Nothing <6;M\:Y*T  
        Return UBound( lineArray ) C]Fw*t   
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    End Function G$a@}9V  
    ; s(bd#Q  
    Sub GetFileList( ByVal in_dir As String, _ v9H t~\>  
                     ByRef in_flist() As String ) A!GvfmzqIn  
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        'Redimension the file list array }-:B`:K&  
        Erase in_flist (LsVd2AbR  
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        'Tracks how many files are found 9U;  
        Dim fCount As Long .=YV  
        fCount = 0 zx<t{e7  
    T%.Y so{  
        'Recurse directory and search for text files =p@2[Uo  
        Dim f As String jS]Saqd  
        f = Dir$(in_dir & "*.txt") 8\;, d  
        While f <> "" 9wCgJ$te  
            ReDim Preserve in_flist(fCount) k% \;$u=%  
            in_flist(fCount) = f g<;pyvq|:  
            fCount += 1 *JImP9SE  
            f = Dir$() 3]1 ! g6  
        Wend +E9G"Z65iP  
        ReDim Preserve in_flist(fCount-1) W'9{2h6u(  
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    End Sub  gwIR3u  
     
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