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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 J Covk1  
    NrdbXPHceN  
    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 lf\]^yM #  
    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。 <M|kOi  
    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。 r9uuVxBD  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 V '4sOn  
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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。 ,9W|$2=F  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) D"m]`H  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 BVX6  
    例如下所示: +Q3i&"QB.  
    Sample name:  EDF-C1-56 h$EH|9HAb  
    Merging data from file EDF-C1-56 0-0.txt }Q?, O  
    Finished merging RPC data for sample EDF-C1-56 @exeHcW61  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt pAo5c4y!4  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !giL~}j(R  
    a. 创建一个新的散射库 :!\?yj{{  
    b. 散射模型命名 c3&;Y0SD  
    c. 改变散射模型为“Tabulated BSDF”. ~4\J }Kn  
    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^  
    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。 !A )2<<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 `)5E_E3  
    g. 点击OK _>8ZL)NQQ  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 i[_WO2  
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    脚本代码 c_ e2'K:  
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    '#Language "WWB-COM" :O}=$[  
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    Option Explicit |?=K'[ 5  
    .|Pq!uLvc  
    Sub Main GRK+/1C  
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        'Cleanup P5Y:c@u2  
        ClearOutputWindow() 0HA`  
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        Print "Merging RPC Photonics BSDF Data Files" TzT(aWP"  
        SetTextColor(255,0,0) /*)zQ?N  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." -s5j^U{h|  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Wp" +\{@)  
        SetTextColor(0,0,0) *UVo>;  
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        'Current directory of this script (should be the same as the text files being merged) a7+w)]r  
        Dim cDir As String X!,2/WT  
        cDir = MacroDir$ & "\" 3xSt -MA  
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        'Array which will be populated with the list of files to be merged );o2e V  
        Dim fList() As String, curFile As String #"J8]3\F  
        GetFileList( cDir, fList ) xx`xDD  
    }&+b\RE  
        Print "" :C*7 DS  
        Print "Files found for merging:" ;x/do?FbT  
        For Each curFile In fList +yvtd]D$2W  
            Print Chr(9) & curFile ]W^F!p~eC  
        Next WC6yQSnY&  
    &M p??{g  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. hXBAs*4DV8  
        Dim nameArray() As String, sampName As String WrB:)Q(8=  
        nameArray = Split(fList(0)," 0-0.txt") V\$'3(*  
        sampName  = nameArray(0) k1l\Rywp  
        Print "" ~:`5Y"Av:  
        Print "Sample name: " & Chr(9) & sampName a<c]N:1  
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        'Open an output file and write the FRED header data TR;"&'#k  
        Dim outFile As String r%`g` It  
        outFile = cDir & sampName & "_FRED.txt" (X=JT  
        Open outFile For Output As #1 0_F6t-  
        Print #1, "type bsdf_data" a_jw4"Sb  
        Print #1, "format angles=deg bsdf=value scale=1" Nm;yL  
    . V5Pr}"y  
        'Loop the file list, skip the two header lines and write the remaining data to file V iY-&q'  
        Dim lineArray() As String, curLine As Long e"7<&% Oq  
        For Each curFile In fList "DN0|%`M/  
            Print "Merging data from file " & curFile 6_Ps*Ed  
            ReadFile( cDir & curFile, lineArray ) Gw!VPFV>W  
            For curLine = 2 To UBound(lineArray) ENZjRf4  
                Print #1, lineArray(curLine) =E6ND8l@2  
            Next <v&L90+s\;  
        Next 2/XrorV  
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        'Close the output file lZ5LHUzP  
        Close #1 %r E:5)  
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        Print "Finished merging RPC data for sample " & sampName 3jSt&+  
        Print "FRED formatted data file: " & Chr(9) & outFile JVfSmxy.  
    End Sub S2y_5XJ<D  
    B*0TM+  
    'Utility function to read the contents of a file into an array of strings. p **Sd[|  
    Function ReadFile(ByVal fileName As String, _ b suGZ  
                      ByRef lineArray() As String) As Long 7:[u.cd  
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        ReadFile = -1 dC'8orFG+  
        Dim oFSO As Object EM2=g9y  
        Set oFSO = CreateObject("Scripting.FileSystemObject") E?v9c>c  
        Erase lineArray &`@S_YLr  
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        Dim fid As Long 8dPDs#Zl  
        If oFSO.fileexists( fileName ) Then ]|m?pt  
            fid = FreeFile() 5#275Hyv  
            Open fileName For Input As fid g=#Cc( q  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) DT;n)7+,  
            Close fid k|hy_? *  
        End If NL^;C3u  
        Set oFSO = Nothing (YV]T!q  
        Return UBound( lineArray ) Vs1H)T%  
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    End Function X%C`('"R  
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    Sub GetFileList( ByVal in_dir As String, _ et`1#_o  
                     ByRef in_flist() As String ) @23?II$=@  
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        'Redimension the file list array "]SA4Ud^  
        Erase in_flist $)YalZ  
    SO|!x}GfI  
        'Tracks how many files are found q1^bH 6*fl  
        Dim fCount As Long tZXq<k9  
        fCount = 0 wC>}9OM  
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        'Recurse directory and search for text files c9ye[81  
        Dim f As String _^Z v[P  
        f = Dir$(in_dir & "*.txt") QbJE+m5  
        While f <> "" xcQD]"   
            ReDim Preserve in_flist(fCount) a S;z YD  
            in_flist(fCount) = f S4S}go*G[  
            fCount += 1 49o/S2b4z  
            f = Dir$() d53Eu`QW?  
        Wend o[aP+O Md  
        ReDim Preserve in_flist(fCount-1) $6l^::U  
    M!`&Z9N  
    End Sub SpO%nZ";g8  
     
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