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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 vI}S6-"<  
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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 #SNI dc>9\  
    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。 >+8I =S  
    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。 IQ~7vk()  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 i]%"s_l  
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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。 6qpV53H  
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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) dvF48,kr  
    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 Fxx2vTV4ag  
    例如下所示: o;_bs~}y  
    Sample name:  EDF-C1-56 q|l|mO  
    Merging data from file EDF-C1-56 0-0.txt w{x(YVS H  
    Finished merging RPC data for sample EDF-C1-56 Y_hRL&u3W  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt AiHf?"EVT  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ;XQ lj?:  
    a. 创建一个新的散射库 R9G)X]  
    b. 散射模型命名 vaJXX  
    c. 改变散射模型为“Tabulated BSDF”. )0MshgM  
    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 ) chzR4"WZFt  
    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。 Vp"Ug,1  
    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 Go7hDmu  
    g. 点击OK +J8/,d  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 $!C+i"q$  
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    脚本代码 F>(#Af9  
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    '#Language "WWB-COM" y$V)^-U>fw  
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    Option Explicit |hQ|'VCN  
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    Sub Main (H%d]  
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        'Cleanup ruA+1-<f  
        ClearOutputWindow() rtmt 3  
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        Print "Merging RPC Photonics BSDF Data Files" *oX]=u&  
        SetTextColor(255,0,0) `R52{B#&/  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Mq lo:7 ^F  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 5po' (r|U  
        SetTextColor(0,0,0) C;:L~)C@t  
    ,xD*^>!  
        'Current directory of this script (should be the same as the text files being merged) b\j&!_   
        Dim cDir As String lc?mKW9  
        cDir = MacroDir$ & "\" \(U"_NPp  
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        'Array which will be populated with the list of files to be merged &W<>^C2v  
        Dim fList() As String, curFile As String 39aCwhh7v  
        GetFileList( cDir, fList ) Q>a7Ps@~  
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        Print "" zo7XmUI3P  
        Print "Files found for merging:" Dq%r !)  
        For Each curFile In fList ^lc}FN  
            Print Chr(9) & curFile VFmg"^k5  
        Next I<(.i!-x  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Q}?N4kg  
        Dim nameArray() As String, sampName As String (GcKaUg8*  
        nameArray = Split(fList(0)," 0-0.txt") x+y!P  
        sampName  = nameArray(0) ?}3PJVy?  
        Print "" Sa?5iFg  
        Print "Sample name: " & Chr(9) & sampName >yA,@%X  
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        'Open an output file and write the FRED header data feI[M;7u  
        Dim outFile As String +>WC^s  
        outFile = cDir & sampName & "_FRED.txt" JQ/t, v$G  
        Open outFile For Output As #1 j*La ,iF  
        Print #1, "type bsdf_data" S|q!? /jqj  
        Print #1, "format angles=deg bsdf=value scale=1" i B!hEbz  
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        'Loop the file list, skip the two header lines and write the remaining data to file k#Ez  
        Dim lineArray() As String, curLine As Long 4$zFR}f  
        For Each curFile In fList $]H=  
            Print "Merging data from file " & curFile !` M;#  
            ReadFile( cDir & curFile, lineArray ) *)`kx   
            For curLine = 2 To UBound(lineArray) 2^ ,H_PS  
                Print #1, lineArray(curLine) Y( $Ji12  
            Next h/ X5w4  
        Next Q%n{*py  
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        'Close the output file v :+8U[x  
        Close #1 s@ 2 0#D  
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        Print "Finished merging RPC data for sample " & sampName P"bknXL  
        Print "FRED formatted data file: " & Chr(9) & outFile 5Q$r@&qp  
    End Sub $\,BpZ }3  
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    'Utility function to read the contents of a file into an array of strings. (3N"oE.b]  
    Function ReadFile(ByVal fileName As String, _ QlRoe| {  
                      ByRef lineArray() As String) As Long %0NkIQ`C  
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        ReadFile = -1 ]~prR?  
        Dim oFSO As Object &>W  (l.  
        Set oFSO = CreateObject("Scripting.FileSystemObject") y^d[( c  
        Erase lineArray =CjNtD2]  
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        Dim fid As Long < g3du~  
        If oFSO.fileexists( fileName ) Then &SjHrOG?  
            fid = FreeFile() +^4BO`   
            Open fileName For Input As fid 8R\>FNk;  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) tM^;?HL]  
            Close fid Hbjb7Y?[  
        End If wc7mJxJxA  
        Set oFSO = Nothing _(oP{w gB  
        Return UBound( lineArray ) L$29L:  
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    End Function g5tjj.  
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    Sub GetFileList( ByVal in_dir As String, _ 't|Un G  
                     ByRef in_flist() As String ) af<NMgT2s~  
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        'Redimension the file list array s&dO/}3uR]  
        Erase in_flist ^)f{q)to  
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        'Tracks how many files are found _{LN{iqDv  
        Dim fCount As Long %@}o'=[  
        fCount = 0 )-+\M_JK5  
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        'Recurse directory and search for text files Mw"xm9(Q  
        Dim f As String nT.L}1@  
        f = Dir$(in_dir & "*.txt") gppBFS  
        While f <> "" 7?=43bZl  
            ReDim Preserve in_flist(fCount) ORGv)>C|  
            in_flist(fCount) = f K*R)V/B/l  
            fCount += 1 NP K#].F  
            f = Dir$() 0'?V|V=v  
        Wend ixIV=#  
        ReDim Preserve in_flist(fCount-1) _tWJXv~;  
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    End Sub 1t/dxB;  
     
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