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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 LTBH/[q5  
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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 :?EZ\WM7  
    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。 5jK|  
    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。 U`N?<zm<oO  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 D',7T=C   
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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。 (Of`VT3ZOA  
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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) g_PP 9S_?  
    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 fb0)("_V  
    例如下所示: (MqQ3ys  
    Sample name:  EDF-C1-56 /xSJljexz  
    Merging data from file EDF-C1-56 0-0.txt $EIKi'!8  
    Finished merging RPC data for sample EDF-C1-56 73 1RqUR  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt i.K!;E>  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Xa-TNnws?  
    a. 创建一个新的散射库 O|Vc  
    b. 散射模型命名 NG\'Ii:-J  
    c. 改变散射模型为“Tabulated BSDF”. ?$I9/r  
    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 ) t?^!OJ:L  
    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。 ~U7Bo(EJp  
    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 ,d!@5d&Zi  
    g. 点击OK D0 q42+5  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +p _?ekV\  
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    脚本代码 r1.zURY  
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    '#Language "WWB-COM" V]]!0ugvk(  
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    Option Explicit 7r3CO<fb  
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    Sub Main 2>.b~q@  
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        'Cleanup 1QhQ#`$<1  
        ClearOutputWindow() 3KeY4b!h  
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        Print "Merging RPC Photonics BSDF Data Files" Pdh`Gu1:3  
        SetTextColor(255,0,0) &&jQ4@m}j  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." FP y}Wc*UA  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." GM8>u O  
        SetTextColor(0,0,0) M d Eds|D  
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        'Current directory of this script (should be the same as the text files being merged) q$H@W. f  
        Dim cDir As String li{<F{7  
        cDir = MacroDir$ & "\" u46Z}~xfb  
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        'Array which will be populated with the list of files to be merged ; X+.Ag  
        Dim fList() As String, curFile As String ME)='~E  
        GetFileList( cDir, fList ) 4S+E% b|)  
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        Print "" !z :j-gT3  
        Print "Files found for merging:" ]m &Ss  
        For Each curFile In fList grI#'x  
            Print Chr(9) & curFile l7<VHz0b  
        Next &_@M 6[-  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -W/D Cj<  
        Dim nameArray() As String, sampName As String !Dc;R+Ir0!  
        nameArray = Split(fList(0)," 0-0.txt") z 36Y/{>[  
        sampName  = nameArray(0) ?#doH,  
        Print "" S,,Wb &A$  
        Print "Sample name: " & Chr(9) & sampName 'F*OlZ!BWy  
    bF;|0X$ x  
        'Open an output file and write the FRED header data ",5=LW&,  
        Dim outFile As String SN7_^F  
        outFile = cDir & sampName & "_FRED.txt" EronNtu8i  
        Open outFile For Output As #1 'UGgY3  
        Print #1, "type bsdf_data" wsR\qq  
        Print #1, "format angles=deg bsdf=value scale=1" -IDhK}C&T  
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        'Loop the file list, skip the two header lines and write the remaining data to file {~#01p5  
        Dim lineArray() As String, curLine As Long ?!c7Zx,(  
        For Each curFile In fList 8MU7|9 Q  
            Print "Merging data from file " & curFile 6/'X$}X  
            ReadFile( cDir & curFile, lineArray ) %3=T7j  
            For curLine = 2 To UBound(lineArray) gH"a MEC  
                Print #1, lineArray(curLine) \O~WMN  
            Next U(~Nmo'  
        Next OzH\YN  
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        'Close the output file $j!:ET'V  
        Close #1   LR4W  
    ^"uD:f)  
        Print "Finished merging RPC data for sample " & sampName Fy>g*3  
        Print "FRED formatted data file: " & Chr(9) & outFile 6aAN8wO;b  
    End Sub u2':~h?l  
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    'Utility function to read the contents of a file into an array of strings. *Hv d  
    Function ReadFile(ByVal fileName As String, _ a_DK"8I  
                      ByRef lineArray() As String) As Long |llmq'Q  
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        ReadFile = -1 q}E'x/s2m  
        Dim oFSO As Object AGx(IK/_  
        Set oFSO = CreateObject("Scripting.FileSystemObject") >Fe=PRs  
        Erase lineArray FELW?Q?k  
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        Dim fid As Long i4SWFa``  
        If oFSO.fileexists( fileName ) Then Jcp=<z*0  
            fid = FreeFile() !_dW  `  
            Open fileName For Input As fid oChf&W 8u  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Vrp]YR L`  
            Close fid !:_krLB<  
        End If gaU^l73 ,C  
        Set oFSO = Nothing %yR 80mn8  
        Return UBound( lineArray ) # ?u bvSdU  
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    End Function *JWPt(bnI  
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    Sub GetFileList( ByVal in_dir As String, _ #m'+1 s L  
                     ByRef in_flist() As String ) )1)&fN41i#  
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        'Redimension the file list array /pGx !  
        Erase in_flist 0U2dNLc  
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        'Tracks how many files are found j{m{hVa  
        Dim fCount As Long LH~ t5  
        fCount = 0 tK\$LZ  
    (d[JMO^@8  
        'Recurse directory and search for text files 6fT^t!<i  
        Dim f As String 5YiBPB")  
        f = Dir$(in_dir & "*.txt") CZCVC (/u  
        While f <> "" |fn%!d`2  
            ReDim Preserve in_flist(fCount) '?E@H.""  
            in_flist(fCount) = f Hxj8cX UF|  
            fCount += 1 (g tOYEqx  
            f = Dir$() ;tZ8Sh)  
        Wend w#sP5qKv8  
        ReDim Preserve in_flist(fCount-1) H_%ae' W  
    ^$8WV&5q>  
    End Sub _`9WNJiL  
     
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