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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 Fxv~;o#  
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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 s26s:A3rh  
    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。 Gpe h#Q4x  
    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。 f`WmRx]K  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 R(pvUm& L  
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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。 <%pi*:E|  
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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) aeSy, :  
    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 ]o,)#/' $  
    例如下所示: s_`wLQ7e  
    Sample name:  EDF-C1-56 HaB=nLAT  
    Merging data from file EDF-C1-56 0-0.txt EW2e k^  
    Finished merging RPC data for sample EDF-C1-56 U0jq.]P  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5Odi\SJ&  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 a^Zn }R r  
    a. 创建一个新的散射库 3w{ i5gGn  
    b. 散射模型命名 [`ttNW(_  
    c. 改变散射模型为“Tabulated BSDF”. ,iSs2&$ m  
    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)  
    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。  Kn\Oj=4  
    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 C6'[Tn  
    g. 点击OK  PJk Mn  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值  J|6aa  
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    脚本代码 f_raICO{R  
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    '#Language "WWB-COM" ]BAF  
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    Option Explicit kP8Ypw&  
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    Sub Main db#y]>^l  
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        'Cleanup krz@1[w-j  
        ClearOutputWindow() Fzu"&&>0$  
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        Print "Merging RPC Photonics BSDF Data Files" S'3l<sY  
        SetTextColor(255,0,0) ;Kkn7&'F  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ;2dhue  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." a |z{B b  
        SetTextColor(0,0,0) |dX#4Mq^,  
    $)7-wCl</  
        'Current directory of this script (should be the same as the text files being merged) 1Ll@ ocE  
        Dim cDir As String xZ,g6s2o  
        cDir = MacroDir$ & "\" .'.|s?s  
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        'Array which will be populated with the list of files to be merged I"@5=m5  
        Dim fList() As String, curFile As String b;x^>(It  
        GetFileList( cDir, fList ) d>vGx  
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        Print "" KbwWrf>  
        Print "Files found for merging:" %f{kT<XHu  
        For Each curFile In fList zyCl`r[}  
            Print Chr(9) & curFile xTAC&OCk^[  
        Next U4LOe}Ny  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. |n6nRE wW  
        Dim nameArray() As String, sampName As String evszfCH'J  
        nameArray = Split(fList(0)," 0-0.txt") vNJ!i\bX  
        sampName  = nameArray(0) `86 9XE  
        Print "" kTC6fNj[  
        Print "Sample name: " & Chr(9) & sampName GhpH7% s  
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        'Open an output file and write the FRED header data :Z=A,G  
        Dim outFile As String VnIJ$5Y  
        outFile = cDir & sampName & "_FRED.txt" t5eux&C  
        Open outFile For Output As #1 ~@sx}u  
        Print #1, "type bsdf_data" `7N[rs9|S  
        Print #1, "format angles=deg bsdf=value scale=1" 8Cm^#S,+  
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        'Loop the file list, skip the two header lines and write the remaining data to file })"9TfC  
        Dim lineArray() As String, curLine As Long RqcX_x(p  
        For Each curFile In fList @p `#y  
            Print "Merging data from file " & curFile fMLm_5(H  
            ReadFile( cDir & curFile, lineArray ) :&TOQ<vM  
            For curLine = 2 To UBound(lineArray) ]@WJ&e/'@  
                Print #1, lineArray(curLine) @~a52'\  
            Next gL}K84T$S  
        Next #j;&g1  
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        'Close the output file $>#PhOC  
        Close #1 /{qr~7k,oQ  
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        Print "Finished merging RPC data for sample " & sampName o.k#|q  
        Print "FRED formatted data file: " & Chr(9) & outFile eKLxNw5  
    End Sub //6m2a  
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    'Utility function to read the contents of a file into an array of strings. OwDjUKeN  
    Function ReadFile(ByVal fileName As String, _ b/S4b  
                      ByRef lineArray() As String) As Long Rmd;u g9  
    !-\*rdE {9  
        ReadFile = -1 }-8K*A3  
        Dim oFSO As Object q+LjWZ+O  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Ye(0'*-jyc  
        Erase lineArray Lw!@[;2  
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        Dim fid As Long VMtR4!:q  
        If oFSO.fileexists( fileName ) Then $wX5`d 1  
            fid = FreeFile() wmT3 >  
            Open fileName For Input As fid Grw_SVa^  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) !5=3Y4bg1  
            Close fid fh,Y#.V`  
        End If %7V?7BE  
        Set oFSO = Nothing $RF"m"  
        Return UBound( lineArray ) I s88+,O  
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    End Function TJO|{Lxm  
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    Sub GetFileList( ByVal in_dir As String, _ =@ON>SmPs  
                     ByRef in_flist() As String ) sY1*Wo lA  
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        'Redimension the file list array s'5 jvlG  
        Erase in_flist $]%k <|X  
    w|$;$a7)  
        'Tracks how many files are found eL-92]]e  
        Dim fCount As Long *!nS4 [d  
        fCount = 0 3HfT9  
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        'Recurse directory and search for text files sQt@B#;  
        Dim f As String dn5T7a~   
        f = Dir$(in_dir & "*.txt") d5u,x.R  
        While f <> "" bg 7b!t1F  
            ReDim Preserve in_flist(fCount) 7GPBn}{W  
            in_flist(fCount) = f 4V[+6EV  
            fCount += 1 1zl@$ Nt  
            f = Dir$() @o>2:D1G  
        Wend tM !1oWH  
        ReDim Preserve in_flist(fCount-1) G%4vZPA  
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    End Sub c{&sf y  
     
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