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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: 2025-07-22
    摘要 :&w{\-0{  
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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 \a|L/9%  
    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。 Ee2c5C!|C  
    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。 u8vuwbra!  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 K_/B?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。 csQfic  
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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) ;<wS+4,  
    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 #kmh:P  
    例如下所示: :k,Q,B.I  
    Sample name:  EDF-C1-56 Ru\_dr2yI}  
    Merging data from file EDF-C1-56 0-0.txt (pR.Abq  
    Finished merging RPC data for sample EDF-C1-56 [=%YV# O  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt = +Xc4a  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 BavO\{J#|0  
    a. 创建一个新的散射库 Z)"61) )  
    b. 散射模型命名 =zg:aTMti  
    c. 改变散射模型为“Tabulated BSDF”. E~hzh /,34  
    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 ) 0b|zk <  
    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。 fI|[Z+"  
    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 q/&y*)&'O  
    g. 点击OK \f Lvw  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q<"[C 1Lj  
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    脚本代码 G*}F5.>8(  
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    '#Language "WWB-COM" IB5BO7J  
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    Option Explicit ?.bnIwQe  
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    Sub Main n(;:*<Rh  
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        'Cleanup y2yKm1<Ru<  
        ClearOutputWindow() H{G{H=K_  
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        Print "Merging RPC Photonics BSDF Data Files" lE#m]D  
        SetTextColor(255,0,0) ,"?A2n-qO  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." JBX[bx52<r  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." A.%CAGU5w  
        SetTextColor(0,0,0) vK'?:}~  
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        'Current directory of this script (should be the same as the text files being merged) -8Ti*:  
        Dim cDir As String +|RB0}hFS-  
        cDir = MacroDir$ & "\" \NL+}cL/  
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        'Array which will be populated with the list of files to be merged 9@VO+E$7L  
        Dim fList() As String, curFile As String *,WP,-0  
        GetFileList( cDir, fList ) UVu DQ  
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        Print "" )9j06(<A  
        Print "Files found for merging:" vA%^`5  
        For Each curFile In fList Sfjje4R  
            Print Chr(9) & curFile (M-ZQ -  
        Next (k"_># %  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. C?Zw6M+  
        Dim nameArray() As String, sampName As String ,TC;{ $O5  
        nameArray = Split(fList(0)," 0-0.txt") C;B}3g&  
        sampName  = nameArray(0) y&J@?Hc>  
        Print "" \c`oy=qY0  
        Print "Sample name: " & Chr(9) & sampName <9A@`_';Aq  
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        'Open an output file and write the FRED header data zsl,,gk9Y  
        Dim outFile As String N=1JhjVk"  
        outFile = cDir & sampName & "_FRED.txt" h5zVGr  
        Open outFile For Output As #1 TCVl8)j  
        Print #1, "type bsdf_data" [w \?j,  
        Print #1, "format angles=deg bsdf=value scale=1" $ChK]v 6C  
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        'Loop the file list, skip the two header lines and write the remaining data to file _GtBP'iN  
        Dim lineArray() As String, curLine As Long vwGeD|Fb5  
        For Each curFile In fList *wbZ;rfF  
            Print "Merging data from file " & curFile A7XnHPIw  
            ReadFile( cDir & curFile, lineArray ) (&\aA 0-}H  
            For curLine = 2 To UBound(lineArray) \k8rxW  
                Print #1, lineArray(curLine) &Vk; VM`5  
            Next ] gb=  
        Next $ItF])Bj5N  
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        'Close the output file v Y|!  
        Close #1 B/uniR^x  
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        Print "Finished merging RPC data for sample " & sampName kAzd8nJ'  
        Print "FRED formatted data file: " & Chr(9) & outFile tx7~S Ur  
    End Sub 4/> Our 5  
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    'Utility function to read the contents of a file into an array of strings. h rN%  
    Function ReadFile(ByVal fileName As String, _ <&!]K?Q9i  
                      ByRef lineArray() As String) As Long ,K9f_bv  
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        ReadFile = -1 =v6*|  
        Dim oFSO As Object (zo^Nn9VJ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") %i{;r35M;9  
        Erase lineArray [\ )Ge  
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        Dim fid As Long wVK*P -C  
        If oFSO.fileexists( fileName ) Then eARk QV  
            fid = FreeFile() Bd0eC#UGkQ  
            Open fileName For Input As fid S9sR#  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Bn wzcl  
            Close fid obClBO)@Y  
        End If 5t:8.%<UK  
        Set oFSO = Nothing cSP*f0n,eo  
        Return UBound( lineArray )  NY  
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    End Function [G|mY6F^  
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    Sub GetFileList( ByVal in_dir As String, _ CX/(o]  
                     ByRef in_flist() As String ) D@Da0  
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        'Redimension the file list array G&{HTYP  
        Erase in_flist \y Hen|%  
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        'Tracks how many files are found nn~YK  
        Dim fCount As Long haSM=;uPM  
        fCount = 0 [`fI:ao|  
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        'Recurse directory and search for text files $ACx*e%  
        Dim f As String w; TkkDH  
        f = Dir$(in_dir & "*.txt") 3 pWM~(#>-  
        While f <> "" f|3q^wjs  
            ReDim Preserve in_flist(fCount) 5a`%)K  
            in_flist(fCount) = f U5ZX78>a  
            fCount += 1 a=}*mF[ug  
            f = Dir$() [IX+M#mf  
        Wend z5cYyx r>  
        ReDim Preserve in_flist(fCount-1) 7v~j=Z>  
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    End Sub 3x*z\VJ  
     
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