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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 07-22
    摘要 P @~)9W  
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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 C[,&Y&`j  
    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。 Js&.p9S2  
    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。 `PT'Lakf;3  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zJ_y"bt  
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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。 nE56A#,Q,  
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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) D,()e^o  
    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 r)Ja\ ;  
    例如下所示: 8v)iOPmDC  
    Sample name:  EDF-C1-56 K,,'{j2#f  
    Merging data from file EDF-C1-56 0-0.txt q7pe\~q  
    Finished merging RPC data for sample EDF-C1-56 ;?v&=Z't.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt V}ls|B$Y  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~sdM~9@ '  
    a. 创建一个新的散射库 J(SGaHm@  
    b. 散射模型命名 wlEK"kKU  
    c. 改变散射模型为“Tabulated BSDF”. aoBiN_  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) @p@b6iLpO  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 .vie#,la  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 Fd<eh(g9P  
    g. 点击OK &(m01  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ByacSN  
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    脚本代码 SX&Q5:  
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    '#Language "WWB-COM" @aP1[(m  
    %LuA:{EVD  
    Option Explicit . I."q  
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    Sub Main '>HLE)l  
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        'Cleanup r5y*SoD!  
        ClearOutputWindow() EMDYeXpV  
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        Print "Merging RPC Photonics BSDF Data Files" {w@9\LsU  
        SetTextColor(255,0,0) !3{;oU%*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." <`?%Cz AO  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." d5`D[,]d  
        SetTextColor(0,0,0) ay#f\P!1  
    cgO<%_l3`  
        'Current directory of this script (should be the same as the text files being merged) wB:<ICm  
        Dim cDir As String AY;[v.Ff4  
        cDir = MacroDir$ & "\" yq1 G6hw  
    '<>?gE0Cd  
        'Array which will be populated with the list of files to be merged c7.M\f P  
        Dim fList() As String, curFile As String Gzs$0Ki=  
        GetFileList( cDir, fList ) Qkw?Q V-`k  
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        Print "" ";/ogFi  
        Print "Files found for merging:" U\!9dhx  
        For Each curFile In fList c|K:oi,z  
            Print Chr(9) & curFile z|t2;j[  
        Next 7-0j8$`  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. TM|PwY  
        Dim nameArray() As String, sampName As String <AK9HPxP  
        nameArray = Split(fList(0)," 0-0.txt") 9aX!<Z  
        sampName  = nameArray(0) :98:U~ d1  
        Print ""  y(#6nG@S  
        Print "Sample name: " & Chr(9) & sampName skU }BUK6  
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        'Open an output file and write the FRED header data ZUvc|5]  
        Dim outFile As String nPDoK!r'  
        outFile = cDir & sampName & "_FRED.txt" ]re}EB\Rs  
        Open outFile For Output As #1 c?KIHZ0  
        Print #1, "type bsdf_data" itg"dGDk  
        Print #1, "format angles=deg bsdf=value scale=1" `5"3Cj"M  
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        'Loop the file list, skip the two header lines and write the remaining data to file 8n:N#4Dh^  
        Dim lineArray() As String, curLine As Long Q- w_ @~  
        For Each curFile In fList suYbD!`(  
            Print "Merging data from file " & curFile g9=_^^Tg  
            ReadFile( cDir & curFile, lineArray ) ddbQFAQQQ  
            For curLine = 2 To UBound(lineArray) NNwGRoDco  
                Print #1, lineArray(curLine) 2dK:VC4U  
            Next 6!N2B[9  
        Next :D eJnE  
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        'Close the output file H/Rzs$pnv  
        Close #1 8'NT_NPNb  
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        Print "Finished merging RPC data for sample " & sampName 9p1@Lfbj  
        Print "FRED formatted data file: " & Chr(9) & outFile '&2-{Y [!  
    End Sub `m #i|8  
    %;|dEY  
    'Utility function to read the contents of a file into an array of strings. %$'fq*8b  
    Function ReadFile(ByVal fileName As String, _ eKo=g|D  
                      ByRef lineArray() As String) As Long o wI:Qs_/4  
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        ReadFile = -1 -F 9 xPw  
        Dim oFSO As Object E25w^x2  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 'Sesh'2 /  
        Erase lineArray d+6q% U  
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        Dim fid As Long id" l"  
        If oFSO.fileexists( fileName ) Then jQ7-M4qO/  
            fid = FreeFile() a5/Dz&>j6  
            Open fileName For Input As fid #?,"/Btq  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) tR2%oT>h  
            Close fid lL 50PU  
        End If =''b`T$  
        Set oFSO = Nothing 0c8_&  
        Return UBound( lineArray ) EziGkbpd@  
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    End Function B|8|f(tsSa  
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    Sub GetFileList( ByVal in_dir As String, _ iq^;csyKb  
                     ByRef in_flist() As String ) B(5>H2  
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        'Redimension the file list array 2@@evQ  
        Erase in_flist .p?SPR  
    YpRhl(|  
        'Tracks how many files are found P=L@!F+s  
        Dim fCount As Long |sl^4'Ghc  
        fCount = 0 SqdI($F\:  
    :z *jl'L  
        'Recurse directory and search for text files 7+IRI|d  
        Dim f As String 'KT(;Vof  
        f = Dir$(in_dir & "*.txt") "Nz@jv?  
        While f <> "" ^zS;/%  
            ReDim Preserve in_flist(fCount) Azp!;+  
            in_flist(fCount) = f zSu,S4m_;  
            fCount += 1 *"4l}&  
            f = Dir$() ~jmI`X/  
        Wend {E7STLQ_%  
        ReDim Preserve in_flist(fCount-1) F%af05L[  
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    End Sub q_mxZM ->  
     
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