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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 4H<lm*!^  
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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 C6y&#uX\  
    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。 :a)u&g@G  
    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。 {qMIGwu  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 N.{D$"  
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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。 k@:%:Sj 2  
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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.3Q96r  
    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 ""|Qtubv  
    例如下所示: ?3xzd P  
    Sample name:  EDF-C1-56 RdML3E  
    Merging data from file EDF-C1-56 0-0.txt }Z,x~G  
    Finished merging RPC data for sample EDF-C1-56 Wiu"k%Qsh  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^v`\x5"Vp  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 .VzT:4-<Q"  
    a. 创建一个新的散射库 ?1eK#Z.  
    b. 散射模型命名 Ez=Olbk  
    c. 改变散射模型为“Tabulated BSDF”. LE>]8[ f6S  
    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 ) ^ovR7+V  
    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。 ]P?vdgEM&  
    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 xK\d4 "  
    g. 点击OK xUistwq  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 iW /}#  
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    脚本代码 <3hRyG@vB  
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    '#Language "WWB-COM" /Mu @,)''  
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    Option Explicit sp*v?5lW  
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    Sub Main <HVt V9R  
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        'Cleanup ]`+HO=0  
        ClearOutputWindow() 'ub@]ru|  
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        Print "Merging RPC Photonics BSDF Data Files" ~O &:C{9=  
        SetTextColor(255,0,0) =rCIumqD-}  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." DZ PPJ2}  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ;x@~A^<el  
        SetTextColor(0,0,0) u^qT2Ss0  
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        'Current directory of this script (should be the same as the text files being merged) xjj6WED  
        Dim cDir As String _t #k,;  
        cDir = MacroDir$ & "\" c|@bwat4  
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        'Array which will be populated with the list of files to be merged wT8DSq  
        Dim fList() As String, curFile As String g~A`N=r;h  
        GetFileList( cDir, fList ) DX K?Cv71z  
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        Print "" <T|3`#o0  
        Print "Files found for merging:" &AbNWtCV+G  
        For Each curFile In fList !NvI:C_4|  
            Print Chr(9) & curFile oEKvl3Hz_  
        Next U0N 60  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Q:k}Jl  
        Dim nameArray() As String, sampName As String X))/ m[_[  
        nameArray = Split(fList(0)," 0-0.txt") +Kbjzh3<wG  
        sampName  = nameArray(0) !58@pLJw  
        Print "" .MoU1n{Yc  
        Print "Sample name: " & Chr(9) & sampName sZ/v^ xk  
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        'Open an output file and write the FRED header data !_'ur>iR  
        Dim outFile As String MC.) 2B7  
        outFile = cDir & sampName & "_FRED.txt" z !rL s76  
        Open outFile For Output As #1 "8jf81V*  
        Print #1, "type bsdf_data" 8(&[Rs?K  
        Print #1, "format angles=deg bsdf=value scale=1" \B,@`dw  
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        'Loop the file list, skip the two header lines and write the remaining data to file 9c,'k#k  
        Dim lineArray() As String, curLine As Long My[pr_xg  
        For Each curFile In fList Ata:^qI  
            Print "Merging data from file " & curFile P'[3Fqe  
            ReadFile( cDir & curFile, lineArray ) 9} M?P  
            For curLine = 2 To UBound(lineArray) W_(j3pV?Ml  
                Print #1, lineArray(curLine) 3E $f)  
            Next "2$fi{9  
        Next 0 e ~JMUb  
    ;m{1 _1  
        'Close the output file Ep3N&Imp  
        Close #1 J({Xg?  
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        Print "Finished merging RPC data for sample " & sampName ']z{{UNUN  
        Print "FRED formatted data file: " & Chr(9) & outFile gS]@I0y8 .  
    End Sub q"sed]  
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    'Utility function to read the contents of a file into an array of strings. }1i`6`y1  
    Function ReadFile(ByVal fileName As String, _ ^{;oM^Q'  
                      ByRef lineArray() As String) As Long {|_M # w~&  
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        ReadFile = -1 V0.vQ/  
        Dim oFSO As Object Wk4s reB  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Tc &z:  
        Erase lineArray tla 5B_  
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        Dim fid As Long {e9@-  
        If oFSO.fileexists( fileName ) Then YPK(be_|I  
            fid = FreeFile() Gm.T;fc:  
            Open fileName For Input As fid L<-_1!wh  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) BBRR)  
            Close fid ]kRfB:4ED  
        End If {9;CNsd  
        Set oFSO = Nothing =eXU@B  
        Return UBound( lineArray ) a85$K$b>  
    BsqP?/  
    End Function vkd.)x`J,  
    x_6[P2"PP  
    Sub GetFileList( ByVal in_dir As String, _ lVR~Bh  
                     ByRef in_flist() As String ) xPk8$1meZM  
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        'Redimension the file list array z.9U}F  
        Erase in_flist i6tf2oqO7  
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        'Tracks how many files are found foF({4q7b^  
        Dim fCount As Long tI TS1  
        fCount = 0 >WQMqQ^t@  
    )3Iz (Ql  
        'Recurse directory and search for text files [.'|_l  
        Dim f As String 2"kLdD  
        f = Dir$(in_dir & "*.txt") N~d?WD\^  
        While f <> "" OgQV;at  
            ReDim Preserve in_flist(fCount) ZaDyg"Tw+  
            in_flist(fCount) = f { MSkHf=  
            fCount += 1 B^Nf #XN(  
            f = Dir$() ~u!|qM  
        Wend N^ds RYC  
        ReDim Preserve in_flist(fCount-1) W*4-.*U8a  
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    End Sub YEs&  
     
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