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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: 07-22
    摘要 >$,y5 AJ&  
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    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 r,Nq7Txn?  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 o`q_wdy?  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 n Ml%'[u  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ]Wq?H-B{  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 f}@jFhr'<  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) N]<!j$pOz  
    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 W!"}E%zx   
    例如下所示: `/MvQ/  
    Sample name:  EDF-C1-56 zWb4([P;  
    Merging data from file EDF-C1-56 0-0.txt \C`~S7jC  
    Finished merging RPC data for sample EDF-C1-56 {|yob4N  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt "luR9l,RRE  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 RNhJ'&SYs  
    a. 创建一个新的散射库 EgDQ+( -  
    b. 散射模型命名 ^+1#[E  
    c. 改变散射模型为“Tabulated BSDF”. 9Y<#=C  
    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 ) W5'3$,X9  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 'D%w|Pe?Q  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 _C+b]r/E  
    g. 点击OK `r_m+]  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ??i4z[0M  
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    脚本代码 %Jf<l&K .`  
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    '#Language "WWB-COM" &k1T08C*  
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    Option Explicit 03iv3/{H  
    E3*\ ^Q_  
    Sub Main d|*"IFe  
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        'Cleanup <uc1D/~^:  
        ClearOutputWindow() ej O}t:}P  
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        Print "Merging RPC Photonics BSDF Data Files" [*Z`Kc  
        SetTextColor(255,0,0) {h KjD"?  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." <soz#}e  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." QERU5|.wc  
        SetTextColor(0,0,0) 033T>qY  
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        'Current directory of this script (should be the same as the text files being merged) rO:u6."_  
        Dim cDir As String B<~U3b  
        cDir = MacroDir$ & "\" u?[ q=0.J7  
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        'Array which will be populated with the list of files to be merged a@pz*e  
        Dim fList() As String, curFile As String \)48904^  
        GetFileList( cDir, fList ) ?~QIALA  
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        Print "" 4TwQO$C  
        Print "Files found for merging:" JNFIT;L  
        For Each curFile In fList +]@Az.E  
            Print Chr(9) & curFile T'fcc6D5p  
        Next nCKbgM'"  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. b`_w])Y@  
        Dim nameArray() As String, sampName As String '&;69`FSe  
        nameArray = Split(fList(0)," 0-0.txt") {@u<3 s  
        sampName  = nameArray(0) ZCg`z  
        Print "" s6 }X t=j  
        Print "Sample name: " & Chr(9) & sampName sK 2 e&  
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        'Open an output file and write the FRED header data EHlytG}@  
        Dim outFile As String 4{qB X?  
        outFile = cDir & sampName & "_FRED.txt" K{l5m{:%  
        Open outFile For Output As #1 Se!)n;?7Sw  
        Print #1, "type bsdf_data" =_[Z W  
        Print #1, "format angles=deg bsdf=value scale=1" s(_+!d6  
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        'Loop the file list, skip the two header lines and write the remaining data to file R1-k3;v^  
        Dim lineArray() As String, curLine As Long $iM=4 3W  
        For Each curFile In fList L;QY<b  
            Print "Merging data from file " & curFile ?_`0G/xl  
            ReadFile( cDir & curFile, lineArray ) &)pK%SAM  
            For curLine = 2 To UBound(lineArray) wG8Wez%  
                Print #1, lineArray(curLine) jFerYv&K~  
            Next m/`IGT5J  
        Next r Db>&s3  
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        'Close the output file IB|]fzy  
        Close #1 4 UAvw  
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        Print "Finished merging RPC data for sample " & sampName A.Bk/N1G  
        Print "FRED formatted data file: " & Chr(9) & outFile &gc `<kLu  
    End Sub +@VYs*&&  
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    'Utility function to read the contents of a file into an array of strings. h<+ |x7u  
    Function ReadFile(ByVal fileName As String, _ CDp8)=WJFF  
                      ByRef lineArray() As String) As Long _N3}gFh>  
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        ReadFile = -1 l oqvi  
        Dim oFSO As Object #3kXmeyrD  
        Set oFSO = CreateObject("Scripting.FileSystemObject") &2EBk=X  
        Erase lineArray Xev54!619  
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        Dim fid As Long cbKL$|  
        If oFSO.fileexists( fileName ) Then &14W vAU  
            fid = FreeFile() Poa?Ej  
            Open fileName For Input As fid Y(GN4@`S  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) J< JBdk  
            Close fid J  fcMca  
        End If /'y5SlE[J  
        Set oFSO = Nothing 4x'AC%&Qi  
        Return UBound( lineArray ) U '[?9/T  
    |t\|:E>" }  
    End Function l9{#sas  
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    Sub GetFileList( ByVal in_dir As String, _ ykq'g|  
                     ByRef in_flist() As String ) ]Qi,j#X  
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        'Redimension the file list array :G'xi2bs  
        Erase in_flist dm R3Y.\jd  
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        'Tracks how many files are found ui'F'"tPz  
        Dim fCount As Long OoP@-D"e  
        fCount = 0 n_$yV:MuT!  
    !Y;<:zx5  
        'Recurse directory and search for text files LCQkgRs}~{  
        Dim f As String =sQ(iso%f  
        f = Dir$(in_dir & "*.txt") ID8k/t!  
        While f <> "" Jm![W8L  
            ReDim Preserve in_flist(fCount) \_oy$>;  
            in_flist(fCount) = f 2ALj}  
            fCount += 1 RT"O;P  
            f = Dir$() @)sc6 *lnW  
        Wend Bt>}LLBS2  
        ReDim Preserve in_flist(fCount-1) vmKT F!;  
    ) YSh D  
    End Sub |}qjqtZ  
     
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