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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 ;b0Q%TDh  
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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 rS BI'op  
    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。 y 9]d{:9  
    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。 y5j:+2|I  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 03fOm  
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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。 kzZgNv#G;  
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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) 6m;>R%S_  
    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 z[c8W@OJ  
    例如下所示: iP(MDVg  
    Sample name:  EDF-C1-56 Z5q%L!4G  
    Merging data from file EDF-C1-56 0-0.txt l[T-Ak  
    Finished merging RPC data for sample EDF-C1-56 0(y*EJA$  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9!n:hhJM  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0vqH-)}  
    a. 创建一个新的散射库 %]LoR$|Y  
    b. 散射模型命名 W/2y; @  
    c. 改变散射模型为“Tabulated BSDF”.  BjH|E@z  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) S5hc@^|0Z  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 7T)y"PZ  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 Bo "9;F  
    g. 点击OK #g6_)B=S  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bPFGQlmIO  
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    脚本代码 XE2Un1i}j1  
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    '#Language "WWB-COM" ~RbVcB#  
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    Option Explicit  ,h^6y  
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    Sub Main h~#F2#.  
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        'Cleanup w]gLd  
        ClearOutputWindow() RDbNC v#  
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        Print "Merging RPC Photonics BSDF Data Files" w@-G_-6W  
        SetTextColor(255,0,0) y05!-G:Y\  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." i<Ms2^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." HMUx/M.j  
        SetTextColor(0,0,0) /1LN\Eu  
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        'Current directory of this script (should be the same as the text files being merged) DL bP$&o  
        Dim cDir As String {1)bLG|$  
        cDir = MacroDir$ & "\" MlWKfe<  
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        'Array which will be populated with the list of files to be merged @-)S*+8  
        Dim fList() As String, curFile As String : _Y^o  
        GetFileList( cDir, fList ) -`q!mdA2  
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        Print "" n/;{-  
        Print "Files found for merging:" -J63'bb7oi  
        For Each curFile In fList xCL)<8[R,}  
            Print Chr(9) & curFile 9mvy+XD  
        Next s>G6/TTH6  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,$Fh^KNo]  
        Dim nameArray() As String, sampName As String RbUir185Y  
        nameArray = Split(fList(0)," 0-0.txt") -aJ(-Np$f  
        sampName  = nameArray(0) C3 "EZe[R  
        Print "" aN"YEL>w  
        Print "Sample name: " & Chr(9) & sampName Z6gwAvf<  
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        'Open an output file and write the FRED header data A(&\wd  
        Dim outFile As String %rs2{Q2k  
        outFile = cDir & sampName & "_FRED.txt" [5xm>Y&}  
        Open outFile For Output As #1 ;L87 %P(.  
        Print #1, "type bsdf_data" `GqF/?i  
        Print #1, "format angles=deg bsdf=value scale=1" |u`YT;`!"-  
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        'Loop the file list, skip the two header lines and write the remaining data to file 6 p;Pf9 f  
        Dim lineArray() As String, curLine As Long 7Z]?a  
        For Each curFile In fList tz65Tn_M  
            Print "Merging data from file " & curFile >%6j-:S  
            ReadFile( cDir & curFile, lineArray ) ("A45\5  
            For curLine = 2 To UBound(lineArray) w:B&8I(n}w  
                Print #1, lineArray(curLine) }k AE  
            Next  @B{  
        Next t#M[w|5?  
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        'Close the output file :D}?H@(69  
        Close #1 EO'+r[Y  
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        Print "Finished merging RPC data for sample " & sampName TS=%iMa  
        Print "FRED formatted data file: " & Chr(9) & outFile gz'{l[  
    End Sub miBCq l@x  
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    'Utility function to read the contents of a file into an array of strings. c5f57Z  
    Function ReadFile(ByVal fileName As String, _ or ~@!  
                      ByRef lineArray() As String) As Long z1RHdu0;z  
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        ReadFile = -1 .nr%c*JUp  
        Dim oFSO As Object ?>=vKU5  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 0*^f EoV  
        Erase lineArray  svo%NQ  
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        Dim fid As Long ]mJ9CP8P1c  
        If oFSO.fileexists( fileName ) Then )jI4]6  
            fid = FreeFile() 1jSmTI d  
            Open fileName For Input As fid f3,Xb ]h  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) /q]fG  
            Close fid LfnQcI$kO  
        End If V'.gE6we  
        Set oFSO = Nothing #I ,c'Vj  
        Return UBound( lineArray ) fiAj# mX  
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    End Function ,iiI5FR  
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    Sub GetFileList( ByVal in_dir As String, _ UWCm:eRQ  
                     ByRef in_flist() As String ) K=sk1<>)m  
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        'Redimension the file list array 10dK%/6/O  
        Erase in_flist }&ew}'*9)  
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        'Tracks how many files are found EA:_PBZ  
        Dim fCount As Long bnp:J|(ld  
        fCount = 0 Pw Amnk !  
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        'Recurse directory and search for text files {yBd{x<>/  
        Dim f As String } F*=+n  
        f = Dir$(in_dir & "*.txt") U$ZbBVa`~  
        While f <> "" "g!/^A!!  
            ReDim Preserve in_flist(fCount) \<=.J`o{  
            in_flist(fCount) = f 3z 5"Ckzb  
            fCount += 1 |[bQJ<v6  
            f = Dir$() &M\qVL%w  
        Wend \Zk<|T61$  
        ReDim Preserve in_flist(fCount-1) b!;WF  
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    End Sub K!88 Nox(  
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