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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 PB:r+[91  
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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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    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。 !uKuO  
    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。 =*WfS^O  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 %8"Aq  
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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。 Kku@!lv  
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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) ub{Yg5{3S\  
    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 W$R@Klz  
    例如下所示: AIwp2Fz  
    Sample name:  EDF-C1-56 pWGIA6&v(  
    Merging data from file EDF-C1-56 0-0.txt j+3=&PkA.]  
    Finished merging RPC data for sample EDF-C1-56 |uA /72  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt qUNXT  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 `$VnB  
    a. 创建一个新的散射库 s.!gsCQme  
    b. 散射模型命名 OFlY"O S[  
    c. 改变散射模型为“Tabulated BSDF”. gM v0[~;u  
    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 ) ]u >~:  
    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。 3{- 8n/4 k  
    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 4Cf.%f9@  
    g. 点击OK ,HW[l.v  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 O/f+B}W  
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    脚本代码 X gA( D  
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    '#Language "WWB-COM" H[iR8<rhQ  
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    Option Explicit ^pvnUODW[  
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    Sub Main ;U<rFs40  
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        'Cleanup qmGLc~M0  
        ClearOutputWindow() sMWNzt  
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        Print "Merging RPC Photonics BSDF Data Files" +C[%^G-:  
        SetTextColor(255,0,0) $%3%&+z$I  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." e:WKb9nT  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." &B ^LaRg  
        SetTextColor(0,0,0) a"X9cU[  
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        'Current directory of this script (should be the same as the text files being merged) 5+iXOs<   
        Dim cDir As String |VML.u:N  
        cDir = MacroDir$ & "\" 7a<:\F}E0  
    ^9?IS<N0]  
        'Array which will be populated with the list of files to be merged e[L%M:e9U  
        Dim fList() As String, curFile As String -f8iq[F5  
        GetFileList( cDir, fList ) um1xSf1Xv  
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        Print "" C.9l${QU  
        Print "Files found for merging:" t\\`#gc9~i  
        For Each curFile In fList X?OH//co  
            Print Chr(9) & curFile m3 W  
        Next Q)\4  .d  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c\(CbC  
        Dim nameArray() As String, sampName As String Meo. V|1  
        nameArray = Split(fList(0)," 0-0.txt") 4xD`Z_U  
        sampName  = nameArray(0) X< p KAO\  
        Print "" ORo,.#<  
        Print "Sample name: " & Chr(9) & sampName }:hN}*H  
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        'Open an output file and write the FRED header data 8iUj9r_  
        Dim outFile As String J`d;I#R%c  
        outFile = cDir & sampName & "_FRED.txt" JWvL  
        Open outFile For Output As #1 }w/6"MJ[n  
        Print #1, "type bsdf_data" yk&PJ;%O<  
        Print #1, "format angles=deg bsdf=value scale=1" #hF(`oX}4K  
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        'Loop the file list, skip the two header lines and write the remaining data to file ]?a i  
        Dim lineArray() As String, curLine As Long k^*S3#"  
        For Each curFile In fList q!\4|KF~  
            Print "Merging data from file " & curFile MPD<MaW$  
            ReadFile( cDir & curFile, lineArray ) )V?:qCuY>  
            For curLine = 2 To UBound(lineArray) :[.**,0R  
                Print #1, lineArray(curLine) QNm8`1  
            Next R*r;`x  
        Next BXB ZX@jVk  
    .h[yw$z6  
        'Close the output file .FpeVjR''  
        Close #1 8a3h)R  
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        Print "Finished merging RPC data for sample " & sampName /V$U%0  
        Print "FRED formatted data file: " & Chr(9) & outFile 7FGi+  
    End Sub :SvgXMY@  
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    'Utility function to read the contents of a file into an array of strings. 20A`]-D  
    Function ReadFile(ByVal fileName As String, _ V(3=j)#  
                      ByRef lineArray() As String) As Long  w0`8el;  
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        ReadFile = -1 6g&Ev'  
        Dim oFSO As Object + Un(VTD  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 3  G_0DS  
        Erase lineArray aGq1 YOD[$  
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        Dim fid As Long Bw25+l Px  
        If oFSO.fileexists( fileName ) Then Tqj:C8K{  
            fid = FreeFile() xY>@GSO1  
            Open fileName For Input As fid &r)[6a$fW  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) szC<ht?z  
            Close fid Z|$M 9E  
        End If 8(ej]9RObU  
        Set oFSO = Nothing 5L\&"['  
        Return UBound( lineArray ) K$/&C:,Q  
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    End Function TP{2q51yM  
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    Sub GetFileList( ByVal in_dir As String, _ -+{<a!Nb  
                     ByRef in_flist() As String ) bYAtUEv  
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        'Redimension the file list array c8 Je&y8  
        Erase in_flist %8{nuq+c  
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        'Tracks how many files are found K*S3{s%UR  
        Dim fCount As Long .C,D;T{  
        fCount = 0 g+A>Bl3#  
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        'Recurse directory and search for text files 75^AO>gt   
        Dim f As String v6P2v  
        f = Dir$(in_dir & "*.txt") 5y8VA4L/o  
        While f <> "" g5:?O,?  
            ReDim Preserve in_flist(fCount) 5.d[C/pRw  
            in_flist(fCount) = f Q|xa:`3?  
            fCount += 1 ?k dan  
            f = Dir$() o3YW(%cYR  
        Wend H)+QkQb}  
        ReDim Preserve in_flist(fCount-1) Kk`Lu S?  
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    End Sub c{ ([U  
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