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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 ~A,(D-  
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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 X oh@(%  
    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。 z9ZS& =>  
    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。 TZw['o  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 dW#?{n-H<  
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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。 LqoH]AcN  
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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) xZ>@wBQ  
    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 e)A{ {wD/  
    例如下所示: t[X,m]SX  
    Sample name:  EDF-C1-56 P B"nf|pm  
    Merging data from file EDF-C1-56 0-0.txt :0(:}V3z\  
    Finished merging RPC data for sample EDF-C1-56 2GJp`2(%dA  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt dyuT-.2  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 tq2Ti Xo%  
    a. 创建一个新的散射库 2>Sr04Pt  
    b. 散射模型命名 >3)AO04=;  
    c. 改变散射模型为“Tabulated BSDF”. l8RKwECdPn  
    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 ) qaEWK0  
    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。 e4Xo(EY &  
    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 Cp^%;(@  
    g. 点击OK ./Wi(p{F  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 T#D*B]oZ}  
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    脚本代码 J|N>}di  
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    '#Language "WWB-COM" *sq+ Vc(  
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    Option Explicit +3k#M[Bn}  
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    Sub Main H263<^   
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        'Cleanup lv\^@9r  
        ClearOutputWindow() 9Q:}VpT~nG  
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        Print "Merging RPC Photonics BSDF Data Files" }d16xp  
        SetTextColor(255,0,0) 7.7Z|lJ  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." lZ5TDS  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." _`q ei0  
        SetTextColor(0,0,0) 3R ZD=`  
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        'Current directory of this script (should be the same as the text files being merged) =\)qUs\z  
        Dim cDir As String WkK.ON^  
        cDir = MacroDir$ & "\" e% .|PZ)  
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        'Array which will be populated with the list of files to be merged 't un;Y  
        Dim fList() As String, curFile As String d> L*2 g  
        GetFileList( cDir, fList ) 2[yfo8H  
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        Print "" h} <Ie <  
        Print "Files found for merging:" 5=9gH  
        For Each curFile In fList 7wwlZ;w  
            Print Chr(9) & curFile 0} Lx}2  
        Next k{B;J\`E;  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. XyytO;X M-  
        Dim nameArray() As String, sampName As String L*Q#!_K0P  
        nameArray = Split(fList(0)," 0-0.txt") e*jfxQ=qG  
        sampName  = nameArray(0) n%}Vd `c  
        Print "" qjVhBu7A  
        Print "Sample name: " & Chr(9) & sampName Q^\f,E\S  
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        'Open an output file and write the FRED header data DF~{i{  
        Dim outFile As String J-+p]xG  
        outFile = cDir & sampName & "_FRED.txt" 3M<T}>  
        Open outFile For Output As #1 rdQ'#}I x  
        Print #1, "type bsdf_data" %2`geN<  
        Print #1, "format angles=deg bsdf=value scale=1" ,?Nc\Q<:  
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        'Loop the file list, skip the two header lines and write the remaining data to file #J)83  
        Dim lineArray() As String, curLine As Long 0FEn& \2<  
        For Each curFile In fList </7_T<He.  
            Print "Merging data from file " & curFile :h60  
            ReadFile( cDir & curFile, lineArray ) `]\:%+-  
            For curLine = 2 To UBound(lineArray) 8nOent0a  
                Print #1, lineArray(curLine) ctWH?b/ua  
            Next 5W~-|8m  
        Next coFQu ; i  
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        'Close the output file FV W&)-I  
        Close #1 8lcB.M  
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        Print "Finished merging RPC data for sample " & sampName u &s>UkR  
        Print "FRED formatted data file: " & Chr(9) & outFile `#w`-  
    End Sub ]0&ExD\4  
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    'Utility function to read the contents of a file into an array of strings. @I,:(<6  
    Function ReadFile(ByVal fileName As String, _ X6lUFko  
                      ByRef lineArray() As String) As Long Af{K#R8!  
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        ReadFile = -1 gg%9EJpP  
        Dim oFSO As Object r>gU*bs(  
        Set oFSO = CreateObject("Scripting.FileSystemObject") RFq&#3f$  
        Erase lineArray tOf18V{a  
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        Dim fid As Long 0-a[[hL?  
        If oFSO.fileexists( fileName ) Then Y<oDv`a Z0  
            fid = FreeFile() &fu J%  
            Open fileName For Input As fid 3 h~U)mg  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Oe:_B/l  
            Close fid [j^c&}0  
        End If #_}r)q  
        Set oFSO = Nothing U>jLh57  
        Return UBound( lineArray ) 2or!v^^u  
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    End Function skR I \  
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    Sub GetFileList( ByVal in_dir As String, _ G'qGsKf\  
                     ByRef in_flist() As String ) 6}9`z8  
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        'Redimension the file list array o(_~ st<  
        Erase in_flist #>/s tU-  
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        'Tracks how many files are found FY6!)/P0I7  
        Dim fCount As Long mfpL?N  
        fCount = 0 (fJ.o-LQ  
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        'Recurse directory and search for text files cw)'vAE  
        Dim f As String 4RYvI!  
        f = Dir$(in_dir & "*.txt") eED@Z/~6  
        While f <> "" 'E#;`}&Ah  
            ReDim Preserve in_flist(fCount) r=o\!sh[  
            in_flist(fCount) = f P:8P>#L  
            fCount += 1 ehCZhi~  
            f = Dir$() 6*92I  
        Wend +GqV9x 8  
        ReDim Preserve in_flist(fCount-1) 7 ,![oY[  
    (#"iZv,  
    End Sub jJfV_#'N'  
     
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