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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 )gSqO{Z  
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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 YI;iG[T,&  
    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。 knYp"<qj  
    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。 i>,AnkI&  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 (DY[OIHI  
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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。 ^d{5GK'  
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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) prN+{N8YC  
    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 fV5$[CL1  
    例如下所示: (g/A uL  
    Sample name:  EDF-C1-56 .kg 3>*  
    Merging data from file EDF-C1-56 0-0.txt <7F-WR/2n  
    Finished merging RPC data for sample EDF-C1-56 aK - x{  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt B+U:=591  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 1n!:L!,`  
    a. 创建一个新的散射库 '!`\!=j-`  
    b. 散射模型命名 [bP^RY:  
    c. 改变散射模型为“Tabulated BSDF”. T9w=k)  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) S<Gm*$[7  
    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。 < A8>To<  
    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  [. 9[?8  
    g. 点击OK mc8Q2eQat}  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 !pw )sO~  
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    脚本代码 O_a^|ln&  
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    '#Language "WWB-COM" 3MNM<Ih  
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    Option Explicit j\~,Gtn>Z  
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    Sub Main yiC7)=  
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        'Cleanup 2I}pX9  
        ClearOutputWindow() IJGw<cB]+  
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        Print "Merging RPC Photonics BSDF Data Files" ~>u| 7 M$(  
        SetTextColor(255,0,0) ,GYQ,9:  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." .waw=C  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." s__xBY  
        SetTextColor(0,0,0) v f{{z%3T  
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        'Current directory of this script (should be the same as the text files being merged) bc'IoD/  
        Dim cDir As String I@ue eDY  
        cDir = MacroDir$ & "\" { sC Ni  
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        'Array which will be populated with the list of files to be merged /ki-Tha  
        Dim fList() As String, curFile As String MmjZq  
        GetFileList( cDir, fList ) ^BA%]pe$I  
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        Print "" w/m@(EBK  
        Print "Files found for merging:" jjj<B'zt  
        For Each curFile In fList Q*>)W{H&)  
            Print Chr(9) & curFile ?<!q F:r:  
        Next -t|/g5.w_  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ;F"!$Z/  
        Dim nameArray() As String, sampName As String Cj8&wz}ez  
        nameArray = Split(fList(0)," 0-0.txt") ewk7:zS/?  
        sampName  = nameArray(0) I!Z`'1"  
        Print "" T(*,nJi~9  
        Print "Sample name: " & Chr(9) & sampName -/JEKw c  
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        'Open an output file and write the FRED header data /"gRyv  
        Dim outFile As String xyGwYv>*KO  
        outFile = cDir & sampName & "_FRED.txt" Th9V8Rg+E  
        Open outFile For Output As #1 W|>jj$/o  
        Print #1, "type bsdf_data" XY'8oU`]{  
        Print #1, "format angles=deg bsdf=value scale=1" bzNnEH`^]  
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        'Loop the file list, skip the two header lines and write the remaining data to file <x^$Fu  
        Dim lineArray() As String, curLine As Long fI)XV7,X  
        For Each curFile In fList 3s!6rT_=)d  
            Print "Merging data from file " & curFile 1PwtzH .w  
            ReadFile( cDir & curFile, lineArray ) dw<i)P^   
            For curLine = 2 To UBound(lineArray) s0?'mC+p  
                Print #1, lineArray(curLine) DPzW,aIgv  
            Next 4@-tT;$  
        Next )- 3~^Y#r_  
    :.*Q@X}-I  
        'Close the output file 7y|U!r"Y  
        Close #1 p2gdA J  
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        Print "Finished merging RPC data for sample " & sampName 03fOm  
        Print "FRED formatted data file: " & Chr(9) & outFile dP8qP_77A~  
    End Sub kzZgNv#G;  
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    'Utility function to read the contents of a file into an array of strings. lz0-5z+\  
    Function ReadFile(ByVal fileName As String, _ Zmyq6.1q~  
                      ByRef lineArray() As String) As Long =Q_1Mr4O  
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        ReadFile = -1 :b44LXKCP  
        Dim oFSO As Object `nyz,  
        Set oFSO = CreateObject("Scripting.FileSystemObject") f 3H uT=n  
        Erase lineArray >`x|E-X"  
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        Dim fid As Long Z?o0Q\ }1  
        If oFSO.fileexists( fileName ) Then Qf=^C Q=lV  
            fid = FreeFile() yQrgOdo,w  
            Open fileName For Input As fid DS(>R!bb  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) _R\FB|_  
            Close fid fS4foMI63)  
        End If K]m#~J3d>  
        Set oFSO = Nothing -w"I  
        Return UBound( lineArray ) &s`)_P[  
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    End Function Dr.eos4 ~  
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    Sub GetFileList( ByVal in_dir As String, _ uBww  
                     ByRef in_flist() As String ) jv~#'=T'  
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        'Redimension the file list array |-=-/u1  
        Erase in_flist t`JT  
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        'Tracks how many files are found ^ `yhN  
        Dim fCount As Long bDvGFSAH  
        fCount = 0 U^7hw(}me  
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        'Recurse directory and search for text files EcHZ mf  
        Dim f As String rd->@s|4mT  
        f = Dir$(in_dir & "*.txt") KJT N"hF   
        While f <> "" uY~mi9E  
            ReDim Preserve in_flist(fCount) K7&]| ^M9  
            in_flist(fCount) = f fh =R  
            fCount += 1 {Ycgq%1>]  
            f = Dir$() tQzbYzGb7  
        Wend #eKKH]J/  
        ReDim Preserve in_flist(fCount-1) MlWKfe<  
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    End Sub jj&G[-"bv  
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