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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 %'~<:>:"E  
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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 ).`a-Pv  
    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。 hO@v\@;r  
    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。 *9:6t6x  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 >^ 1S26  
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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。 <cOE6;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) I;4CvoT  
    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 3#ZKuGg=  
    例如下所示: n&78~@H  
    Sample name:  EDF-C1-56 3\.)y49,1  
    Merging data from file EDF-C1-56 0-0.txt 1? hd  
    Finished merging RPC data for sample EDF-C1-56 ={0{X9t?'j  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt A,[m=9V  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 R;,HtN  
    a. 创建一个新的散射库 !eoec2h#5  
    b. 散射模型命名 5GxM?%\  
    c. 改变散射模型为“Tabulated BSDF”. KKXb,/  
    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 ) d<m>H$\Dm  
    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。 @"7dk.|  
    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 %~VIxY|d  
    g. 点击OK {:8[Mdf  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q&'Nr3H#tZ  
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    脚本代码 )g<qEyJR  
    !VTS $nJ4  
    '#Language "WWB-COM" s H[34gCh;  
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    Option Explicit Ntrn("!  
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    Sub Main H#` ?toS  
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        'Cleanup IHmNi>E&/  
        ClearOutputWindow() 54j $A  
    \> dG'  
        Print "Merging RPC Photonics BSDF Data Files" 5DUPsV  
        SetTextColor(255,0,0) .Vjpkt:H  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." w%H#>k  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." gb#wrI  
        SetTextColor(0,0,0) CfnCi_=[`  
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        'Current directory of this script (should be the same as the text files being merged) FMr$cKvE]W  
        Dim cDir As String X0=- {<W  
        cDir = MacroDir$ & "\" K ePHn:c  
    }}2hI`   
        'Array which will be populated with the list of files to be merged 41D[[Gh  
        Dim fList() As String, curFile As String  )U`kU`+'  
        GetFileList( cDir, fList ) qz2d'OhmtH  
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        Print "" 4rdrl  
        Print "Files found for merging:" -e\kIK %  
        For Each curFile In fList z<=t3dj  
            Print Chr(9) & curFile j zp%.4/j  
        Next LEa:{s<:  
    []^>QsS(X  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 2*FZ@?X@r  
        Dim nameArray() As String, sampName As String _{);n$`  
        nameArray = Split(fList(0)," 0-0.txt") Vi-@z;k  
        sampName  = nameArray(0) 8Qy |;T}  
        Print "" <[~M|OL9q,  
        Print "Sample name: " & Chr(9) & sampName <O&s 'A[  
    { ,srj['RS  
        'Open an output file and write the FRED header data PrxXL/6  
        Dim outFile As String Rznr 9L  
        outFile = cDir & sampName & "_FRED.txt" [%q":Ig  
        Open outFile For Output As #1 4B(qVf&M  
        Print #1, "type bsdf_data" jqmP^ZS  
        Print #1, "format angles=deg bsdf=value scale=1" @) wXP@7  
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        'Loop the file list, skip the two header lines and write the remaining data to file Y?x3JU0_  
        Dim lineArray() As String, curLine As Long c6.|; 4  
        For Each curFile In fList VgL<uxq  
            Print "Merging data from file " & curFile #+ =afJ  
            ReadFile( cDir & curFile, lineArray ) =!aV?kNS8  
            For curLine = 2 To UBound(lineArray) wEyh;ID3#  
                Print #1, lineArray(curLine) .kV/ 0!q?  
            Next KDk^)zv%!  
        Next wDzS<mm  
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        'Close the output file W X9BS$}0  
        Close #1 *}=W wG  
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        Print "Finished merging RPC data for sample " & sampName g}7%3D  
        Print "FRED formatted data file: " & Chr(9) & outFile aqgSr|  
    End Sub ZgtOy|?|  
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    'Utility function to read the contents of a file into an array of strings. Ns{4BM6j  
    Function ReadFile(ByVal fileName As String, _ R lu;l  
                      ByRef lineArray() As String) As Long 0'",4=c#V  
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        ReadFile = -1 n&lLC&dL  
        Dim oFSO As Object /);6 j,x  
        Set oFSO = CreateObject("Scripting.FileSystemObject") EhoR.  
        Erase lineArray -i4gzak  
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        Dim fid As Long H>?@nYP  
        If oFSO.fileexists( fileName ) Then -lHJ\=  
            fid = FreeFile() B _ >|Mo/  
            Open fileName For Input As fid Rp1OC  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) z;)% i f6  
            Close fid  E2l.  
        End If X^`ld&^*({  
        Set oFSO = Nothing wlJ_, wA  
        Return UBound( lineArray ) <=lP6B  
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    End Function wP'`!O[W  
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    Sub GetFileList( ByVal in_dir As String, _ p O.8>C%  
                     ByRef in_flist() As String ) XT\;2etVL  
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        'Redimension the file list array ZWv$K0agu  
        Erase in_flist lsd\ `X5,  
    .(krB% N  
        'Tracks how many files are found E^s>S,U[y  
        Dim fCount As Long Ek:u[Uw\  
        fCount = 0 #gq3 e  
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        'Recurse directory and search for text files mmi~A<  
        Dim f As String 4)?c[aC4P  
        f = Dir$(in_dir & "*.txt") X~0P+E#  
        While f <> "" ,b/0_Q  
            ReDim Preserve in_flist(fCount) 6%? NNEM  
            in_flist(fCount) = f B}p/ ,4x6  
            fCount += 1 Q{RHW@_/  
            f = Dir$() m@~HHwj  
        Wend }-!$KR]:s  
        ReDim Preserve in_flist(fCount-1) HO' HkVA  
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    End Sub j_Fr3BWS  
     
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