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    [技术]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: 2023-05-11
    摘要 "qy,*{~  
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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 .O<obq~;C  
    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。 '8kP.l  
    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。 p!AAFmc  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 |CbikE}kL  
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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。 < I``&>  
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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) w_VP J  
    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 Z0r'S]fe  
    例如下所示: buHJB*?9  
    Sample name:  EDF-C1-56 86a\+Kz%%L  
    Merging data from file EDF-C1-56 0-0.txt K wVbbC3  
    Finished merging RPC data for sample EDF-C1-56 es0hm2HT3  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $<[79al#  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Lu%b9Jk  
    a. 创建一个新的散射库 @IZnFHN  
    b. 散射模型命名 m.0*NW  
    c. 改变散射模型为“Tabulated BSDF”. [mueZQyI?0  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ql~J8G9  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 `uTmw^pZX  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 cso8xq|b7  
    g. 点击OK 9+!hg'9Qn  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +LJ73 !  
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    脚本代码 KqP#6^ _  
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    '#Language "WWB-COM" l;E(I_ i)  
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    Option Explicit Rf% a'b  
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    Sub Main b\,+f n  
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        'Cleanup EKN~H$.  
        ClearOutputWindow() |k9 C/  
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        Print "Merging RPC Photonics BSDF Data Files" tO&^>&;5  
        SetTextColor(255,0,0) pTuS*MYz  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." :rP=t ,  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." #lO Mm9  
        SetTextColor(0,0,0) UC$ppTCc?  
    $<OD31T  
        'Current directory of this script (should be the same as the text files being merged) TkF[x%o  
        Dim cDir As String l%=;  
        cDir = MacroDir$ & "\" ^=*;X;7  
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        'Array which will be populated with the list of files to be merged Zb#u0Tq  
        Dim fList() As String, curFile As String lk=<A"^S  
        GetFileList( cDir, fList ) *yGGBqd  
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        Print "" dgP3@`YS  
        Print "Files found for merging:" Ws12b $  
        For Each curFile In fList wKY_Bo/d  
            Print Chr(9) & curFile H%{+QwzZ[j  
        Next DW3G  
    -ze J#B)C  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 0IWf!Sk ]  
        Dim nameArray() As String, sampName As String e~(5%CO>#j  
        nameArray = Split(fList(0)," 0-0.txt") IvNT6]6 P  
        sampName  = nameArray(0) |&4/n6;P$0  
        Print "" .eC1qWZJpd  
        Print "Sample name: " & Chr(9) & sampName fd9k?,zM  
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        'Open an output file and write the FRED header data ;9'OOz|+1  
        Dim outFile As String Zgb!E]V[  
        outFile = cDir & sampName & "_FRED.txt" =WJ NWt>  
        Open outFile For Output As #1 :2)/FPL6  
        Print #1, "type bsdf_data" bQ5\ ]5M  
        Print #1, "format angles=deg bsdf=value scale=1" iam1V)V  
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        'Loop the file list, skip the two header lines and write the remaining data to file a09<!0Rp  
        Dim lineArray() As String, curLine As Long ~bpgSP"  
        For Each curFile In fList W!(LF7_!  
            Print "Merging data from file " & curFile 7o}J%z  
            ReadFile( cDir & curFile, lineArray ) Yoll?_k+  
            For curLine = 2 To UBound(lineArray) uvS)8-o&F  
                Print #1, lineArray(curLine) q" 5(H5  
            Next Vf1^4 t  
        Next Q=dy<kg']  
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        'Close the output file 8Cv?Z.x5  
        Close #1 {(?4!rh  
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        Print "Finished merging RPC data for sample " & sampName A+?`?pOm&  
        Print "FRED formatted data file: " & Chr(9) & outFile An/|+r\  
    End Sub f`66h M[  
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    'Utility function to read the contents of a file into an array of strings. J4U1t2@)9  
    Function ReadFile(ByVal fileName As String, _ /z$ u]X  
                      ByRef lineArray() As String) As Long ^LzF@{ G  
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        ReadFile = -1 Srd4))2/0  
        Dim oFSO As Object kg\ >k2h  
        Set oFSO = CreateObject("Scripting.FileSystemObject") |(^PS8wG  
        Erase lineArray <ZR9GlIr  
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        Dim fid As Long Y\'}a+:@Ph  
        If oFSO.fileexists( fileName ) Then ~flV`wy$$1  
            fid = FreeFile() 8*a&Jl  
            Open fileName For Input As fid g< .qUBPKX  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) `5Zz5V  
            Close fid jZr q{Z<  
        End If Eu04e N  
        Set oFSO = Nothing eh#(eua0/  
        Return UBound( lineArray ) [z9Z5sLO  
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    End Function Yc*; /T}  
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    Sub GetFileList( ByVal in_dir As String, _  #:%/(j  
                     ByRef in_flist() As String ) )dd@\n$6  
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        'Redimension the file list array 9( wK@  
        Erase in_flist x ]ot 2  
    ;i:d+!3XwC  
        'Tracks how many files are found ;t`&n['N>  
        Dim fCount As Long 9=2$8JN=(l  
        fCount = 0 II x#2r  
    Uf+%W;}  
        'Recurse directory and search for text files NQ2E  
        Dim f As String H} g{Cr"Ex  
        f = Dir$(in_dir & "*.txt") )w%!{hn  
        While f <> "" 7Hu3>4<  
            ReDim Preserve in_flist(fCount) jEJT-*I1+  
            in_flist(fCount) = f M\Kx'N  
            fCount += 1 UW EV^ &"x  
            f = Dir$() $* Kvc$D  
        Wend VyGJ=[ ]  
        ReDim Preserve in_flist(fCount-1) )53y AyP  
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    End Sub bA->{OPkT  
     
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