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    [分享]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: 2020-12-15
    摘要 "J&WH~8+N  
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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 ]2&RN@  
    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。 6 %`h2Z  
    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。 qs8^qn0A  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 b"Nd8f[  
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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。 Yp3y%n  
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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) ([SJ6ff]&  
    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 'aeuL1mz  
    例如下所示: F *U.cJ%  
    Sample name:  EDF-C1-56 ;i [;%  
    Merging data from file EDF-C1-56 0-0.txt wrJ" (:VZ  
    Finished merging RPC data for sample EDF-C1-56 ;S&anC#E  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt WS@"8+re;  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 PgP\v-.  
    a. 创建一个新的散射库 wSZMHIW  
    b. 散射模型命名 1'\s7P  
    c. 改变散射模型为“Tabulated BSDF”. |g !$TUS.  
    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 ) j5smmtM`s  
    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_<6;#  
    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 IQ$6}.  
    g. 点击OK 9B>P Qbs  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2J)  
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    脚本代码 y34<B)Wy  
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    '#Language "WWB-COM" " w /Odd  
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    Option Explicit 3<1x>e2nT  
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    Sub Main Qip@L WvT  
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        'Cleanup lG[j,MDs  
        ClearOutputWindow() "d0D8B7HI@  
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        Print "Merging RPC Photonics BSDF Data Files" `0+-:sXZ6  
        SetTextColor(255,0,0) r0pwKRE~t  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." F0kAQgUv  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." _0ZBG(  
        SetTextColor(0,0,0) YKOj  
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        'Current directory of this script (should be the same as the text files being merged) [{>1wJ Pdj  
        Dim cDir As String .jbxA2  
        cDir = MacroDir$ & "\" ,nV4%Aa  
    =?\%E[j  
        'Array which will be populated with the list of files to be merged n7/&NiHxv/  
        Dim fList() As String, curFile As String I%<pS ,p  
        GetFileList( cDir, fList ) X]W(  
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        Print "" g`2O h5dA  
        Print "Files found for merging:" 9pWSvalw9  
        For Each curFile In fList {DUtdu[  
            Print Chr(9) & curFile <LJb,l"  
        Next Bob-qCBV  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. &xt GabNk  
        Dim nameArray() As String, sampName As String pWH,nn?w.  
        nameArray = Split(fList(0)," 0-0.txt") |GP&!]  
        sampName  = nameArray(0) b9v<Jk  
        Print "" |tse"A5Z  
        Print "Sample name: " & Chr(9) & sampName PY+4OZ$  
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        'Open an output file and write the FRED header data 43O5|8o  
        Dim outFile As String 1FT3d  
        outFile = cDir & sampName & "_FRED.txt" Krl9O]H/[  
        Open outFile For Output As #1 Y|tK19  
        Print #1, "type bsdf_data" W|s" ;EAM  
        Print #1, "format angles=deg bsdf=value scale=1" OpK_?XG  
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        'Loop the file list, skip the two header lines and write the remaining data to file BP\6N%HC%&  
        Dim lineArray() As String, curLine As Long U9 mK^  
        For Each curFile In fList <zAYq=IU  
            Print "Merging data from file " & curFile vF[ 4kDHk  
            ReadFile( cDir & curFile, lineArray ) dB:c2  
            For curLine = 2 To UBound(lineArray) 2Je]dj4  
                Print #1, lineArray(curLine) ;=6EBP%  
            Next ;&O *KhLH  
        Next |WOc0M[U  
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        'Close the output file {.y_{yWo  
        Close #1 }WBHuVcZG  
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        Print "Finished merging RPC data for sample " & sampName TgHUH>k  
        Print "FRED formatted data file: " & Chr(9) & outFile $~%h4  
    End Sub ,g,Hb\_R)  
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    'Utility function to read the contents of a file into an array of strings. V\l@_%D[(v  
    Function ReadFile(ByVal fileName As String, _ sc6NON#  
                      ByRef lineArray() As String) As Long l/\D0\x2  
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        ReadFile = -1 g=,}j]tl  
        Dim oFSO As Object 9b@yDq3hQ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ;BKU _}k=  
        Erase lineArray B<a` o&?  
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        Dim fid As Long dep"$pys>  
        If oFSO.fileexists( fileName ) Then YBF$/W+=9|  
            fid = FreeFile() f$vTDak  
            Open fileName For Input As fid %&q}5Y4!  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4%I[.dBnM  
            Close fid >VX'`5r>uw  
        End If tCar:p4$  
        Set oFSO = Nothing MX.?tN#F|H  
        Return UBound( lineArray ) ErQ6a%~,  
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    End Function Wcm8,?*  
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    Sub GetFileList( ByVal in_dir As String, _ L' bY,D(J>  
                     ByRef in_flist() As String ) f*9O39&|  
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        'Redimension the file list array ,LxkdV  
        Erase in_flist %/5Wj_|p  
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        'Tracks how many files are found ;oDr8a<A  
        Dim fCount As Long ()F {kM8  
        fCount = 0 m7u`r(&  
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        'Recurse directory and search for text files B;W%P.<.  
        Dim f As String D!.1R!(Z  
        f = Dir$(in_dir & "*.txt") I3d}DpPx%  
        While f <> "" o P;6i  
            ReDim Preserve in_flist(fCount) nAAv42j[  
            in_flist(fCount) = f >}W[>WReI  
            fCount += 1 9cU9'r# h  
            f = Dir$() <gfRAeXA  
        Wend E-FR w  
        ReDim Preserve in_flist(fCount-1) !6@'H4cb=  
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    End Sub .>P:{''  
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