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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 5D\f8L  
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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 F, W~,y  
    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。 "& ])lz[u  
    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。 =mS\i663  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 %HGD;_bhI  
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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。 6t>.[Y"v  
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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) o3Yb7h9  
    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 HG^B#yX  
    例如下所示: Yw4n-0g  
    Sample name:  EDF-C1-56 aoMqSwF=  
    Merging data from file EDF-C1-56 0-0.txt UtPLI al  
    Finished merging RPC data for sample EDF-C1-56 \Jx04[=  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Lm*e5JnV  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 m? eiIrMW  
    a. 创建一个新的散射库 f sJ9bQm/  
    b. 散射模型命名 K(q+ "  
    c. 改变散射模型为“Tabulated BSDF”. nxUJN1b!N  
    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 ) Bp_$.!Qy  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 <'qeXgi  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 /(u}KMR!f  
    g. 点击OK `IP/d  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 'FqQzx"r  
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    脚本代码 5:pM 4J  
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    '#Language "WWB-COM" "S8uoSF`>  
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    Option Explicit S?>HD|Z  
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    Sub Main KC/=TSSXd.  
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        'Cleanup (KFCs^x7wG  
        ClearOutputWindow() gRCdY8GH  
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        Print "Merging RPC Photonics BSDF Data Files" 4lr(,nPRD  
        SetTextColor(255,0,0) #r#1JtT  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 4]yOF_8h  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." J2::'Hw*s  
        SetTextColor(0,0,0) #bUXgn>  
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        'Current directory of this script (should be the same as the text files being merged) Mmxlp .l  
        Dim cDir As String 8B /\U'  
        cDir = MacroDir$ & "\" [BWNRC1  
    O[I\A[*  
        'Array which will be populated with the list of files to be merged Yk)."r&?  
        Dim fList() As String, curFile As String ZIf  
        GetFileList( cDir, fList ) KV]X@7`@  
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        Print "" Y'1S`.  
        Print "Files found for merging:" kw#;w=\>R{  
        For Each curFile In fList 6ys &zy  
            Print Chr(9) & curFile (pY 7J  
        Next x}_]A$nV  
    % W=b? :  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ZjgsR|i  
        Dim nameArray() As String, sampName As String xAK6pDp  
        nameArray = Split(fList(0)," 0-0.txt") qlb- jL  
        sampName  = nameArray(0) 5 xppKt  
        Print "" M^O2\G#B  
        Print "Sample name: " & Chr(9) & sampName =8t]\Y?  
    :# .<[  
        'Open an output file and write the FRED header data ,VCyG:dw  
        Dim outFile As String Rtb7|  
        outFile = cDir & sampName & "_FRED.txt" lhYe;b(  
        Open outFile For Output As #1 %6t2ohO"  
        Print #1, "type bsdf_data" ix([mQg  
        Print #1, "format angles=deg bsdf=value scale=1" ]ro*G"-_1#  
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        'Loop the file list, skip the two header lines and write the remaining data to file H| 8Qp*  
        Dim lineArray() As String, curLine As Long j <Bkj/  
        For Each curFile In fList wCr(D>iM  
            Print "Merging data from file " & curFile hM;lp1l  
            ReadFile( cDir & curFile, lineArray ) |_] Q$q[[%  
            For curLine = 2 To UBound(lineArray) ~tBYIkvWT  
                Print #1, lineArray(curLine) /LvRP yj@  
            Next v*;-yG&  
        Next %5eY'  
    &X|#R1\  
        'Close the output file M[mF8Zf  
        Close #1 I,0q4  
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        Print "Finished merging RPC data for sample " & sampName .$qnZWcgG  
        Print "FRED formatted data file: " & Chr(9) & outFile b\3Oyp>  
    End Sub $"FQj4%d  
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    'Utility function to read the contents of a file into an array of strings. ,u+PyG7 cb  
    Function ReadFile(ByVal fileName As String, _ {)BTR%t  
                      ByRef lineArray() As String) As Long _JHd9)[  
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        ReadFile = -1 :+qF8t[L  
        Dim oFSO As Object 5_- (<B  
        Set oFSO = CreateObject("Scripting.FileSystemObject") y0#u9t"Z;  
        Erase lineArray x c/}#>ED  
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        Dim fid As Long r[BVvX/,F  
        If oFSO.fileexists( fileName ) Then x[$z({Yf  
            fid = FreeFile() bmfI~8  
            Open fileName For Input As fid hEBY8=gK  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) JT-J#Ag  
            Close fid Kla'lCZ  
        End If  f4Xk,1Is  
        Set oFSO = Nothing 0\[Chja  
        Return UBound( lineArray ) te3}d'9&|  
    4)@mSSfn.  
    End Function Q4+gAS9  
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    Sub GetFileList( ByVal in_dir As String, _ umiBj)r  
                     ByRef in_flist() As String ) aMtsmL?=  
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        'Redimension the file list array Z Uox Mm  
        Erase in_flist 1guJG_;z  
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        'Tracks how many files are found \/: {)T~  
        Dim fCount As Long bYEy<7)x  
        fCount = 0 jz qyk^X  
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        'Recurse directory and search for text files %Z):>'  
        Dim f As String , Wk?I%>  
        f = Dir$(in_dir & "*.txt") fh](K'P#^  
        While f <> "" CIb2J)qev  
            ReDim Preserve in_flist(fCount) 1][4.}?F[  
            in_flist(fCount) = f tasUZ#\6  
            fCount += 1 ^Wt*  
            f = Dir$() VU&7P/\f%  
        Wend y#U+c*LB  
        ReDim Preserve in_flist(fCount-1) ] lrWgm  
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    End Sub 0:9.;x9_  
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