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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 3 #8bG(  
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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 GOKca%DT=  
    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。 Ft<6`C  
    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。 m-< "`:+  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 tdCD!rV`{  
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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。 ;JD/4:  
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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) 4N!Eqw  
    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 lpy( un  
    例如下所示: KW&vX%i(.  
    Sample name:  EDF-C1-56 (GeOD V?U  
    Merging data from file EDF-C1-56 0-0.txt 0qCx.<"p8#  
    Finished merging RPC data for sample EDF-C1-56 qg`8f?  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^Fn~@'  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 R0WI s:k2  
    a. 创建一个新的散射库 >" &&,~  
    b. 散射模型命名 `|rr<Tsy\  
    c. 改变散射模型为“Tabulated BSDF”. g'%^-S ]  
    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 ) nNEIwlj;  
    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。 V-7A80!5  
    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 |z+K]R8_  
    g. 点击OK ~+~^c|  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 fF|m~#y  
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    脚本代码 O>M4%p  
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    '#Language "WWB-COM" f]*TIYicc  
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    Option Explicit 7`G FtX}  
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    Sub Main `J26Y"]P  
    \Wn0,%x2  
        'Cleanup TwT@_~ IM  
        ClearOutputWindow() 8rNRQOXOa  
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        Print "Merging RPC Photonics BSDF Data Files" H!81Pq~  
        SetTextColor(255,0,0) n a3st*3V_  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 2Sha&Z*CE  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." FRR`<do5$,  
        SetTextColor(0,0,0) )Bb:?!EuEH  
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        'Current directory of this script (should be the same as the text files being merged) ^h5h kIx0  
        Dim cDir As String A4mnm6Tf  
        cDir = MacroDir$ & "\" OngUZMgdb  
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        'Array which will be populated with the list of files to be merged +*')0I  
        Dim fList() As String, curFile As String LPRvzlY=  
        GetFileList( cDir, fList ) VS\+"TPuH  
    .}4^b\   
        Print "" @krh<T6|  
        Print "Files found for merging:" _KSlIgQ }0  
        For Each curFile In fList ndE"v"_H  
            Print Chr(9) & curFile "~nUwW|=1  
        Next "P9SW?',  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. z<~yns`Y.  
        Dim nameArray() As String, sampName As String jFwu&e[9;  
        nameArray = Split(fList(0)," 0-0.txt") ./r#\X)dc  
        sampName  = nameArray(0) _]"uq/UWp  
        Print "" *_,: &Ur  
        Print "Sample name: " & Chr(9) & sampName ^dP]3D1 @  
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        'Open an output file and write the FRED header data 8n~ o="  
        Dim outFile As String p8bAz  
        outFile = cDir & sampName & "_FRED.txt" BHrNDpv  
        Open outFile For Output As #1 }48 o{\  
        Print #1, "type bsdf_data" 1!"iN~  
        Print #1, "format angles=deg bsdf=value scale=1" tg#d.(  
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        'Loop the file list, skip the two header lines and write the remaining data to file &3~_9+  
        Dim lineArray() As String, curLine As Long M WHzrqCA  
        For Each curFile In fList V =-hqo(  
            Print "Merging data from file " & curFile Q!`  
            ReadFile( cDir & curFile, lineArray ) 9X ^D(  
            For curLine = 2 To UBound(lineArray) _WB*ArR  
                Print #1, lineArray(curLine) j@778fvM\t  
            Next ;]I~AGH:  
        Next ps&p|  
    ?'%9  
        'Close the output file m1{OaHxKh  
        Close #1 @S#Ls="G  
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        Print "Finished merging RPC data for sample " & sampName *If ]f0?%  
        Print "FRED formatted data file: " & Chr(9) & outFile ,Z aPY  
    End Sub XMi)PXs$  
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    'Utility function to read the contents of a file into an array of strings. 3uJ>:,~r  
    Function ReadFile(ByVal fileName As String, _ r6 :c<p[c  
                      ByRef lineArray() As String) As Long :(Uz`k7   
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        ReadFile = -1 1WJ%n;  
        Dim oFSO As Object rG"QK!R5  
        Set oFSO = CreateObject("Scripting.FileSystemObject") MgG_D6tDM  
        Erase lineArray 6e q`/~#  
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        Dim fid As Long O od?ifA  
        If oFSO.fileexists( fileName ) Then NoD\t(@h  
            fid = FreeFile() g6l&;S40  
            Open fileName For Input As fid Q ~>="Yiu  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?CHFy2%Y  
            Close fid w W1>#F  
        End If |p"4cG?)  
        Set oFSO = Nothing |\] _u 3  
        Return UBound( lineArray ) r>.^4Z@  
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    End Function q+)csgN  
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    Sub GetFileList( ByVal in_dir As String, _ ~ s# !\Ye  
                     ByRef in_flist() As String ) "u.4@^+i  
    0\a;} S'g#  
        'Redimension the file list array F%F:Gr/  
        Erase in_flist * u{CnH  
    xjO((JC  
        'Tracks how many files are found ," ~4l&  
        Dim fCount As Long &XH{,fv$  
        fCount = 0 m~U2 L  
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        'Recurse directory and search for text files [/Ya4=C@  
        Dim f As String ~G#^kNme  
        f = Dir$(in_dir & "*.txt") zyF[I6Gs  
        While f <> "" Sh2;^6d  
            ReDim Preserve in_flist(fCount) aVbv.>  
            in_flist(fCount) = f s\#eD0|  
            fCount += 1 3|g]2|~w@h  
            f = Dir$() u>I;Cir4  
        Wend 3G9AS#-C  
        ReDim Preserve in_flist(fCount-1) pGhA  
    L?~-<k  
    End Sub SYZS@o  
     
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