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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 Zgd| J T7  
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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 #f d ;]  
    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。 Qt` }$]  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 .*+%-%CbP  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 @p~f*b4H?  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 RG4T9eZq  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) (Rj'd>%c  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 yy8h8{=g  
    例如下所示: 'W(!N%u  
    Sample name:  EDF-C1-56 8cI<~|4_  
    Merging data from file EDF-C1-56 0-0.txt >UlAae44  
    Finished merging RPC data for sample EDF-C1-56 = wEU+R_#o  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt z$C}V/Ey  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 _P,3~ ;  
    a. 创建一个新的散射库 :@K 1pAh4  
    b. 散射模型命名 <2{g[le  
    c. 改变散射模型为“Tabulated BSDF”. DC+ p s  
    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 ) G*`Y~SJp  
    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。 P3Ocfpf Bp  
    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 eb10=Lmj  
    g. 点击OK uf q9+}  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 R<]f[  
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    脚本代码 Qx<86aKkF  
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    '#Language "WWB-COM" c{4Y?SSx  
    !'#Y-"=ypk  
    Option Explicit mQwP-s  
    1!/WC.0  
    Sub Main nz+k ,  
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        'Cleanup q}x+#[Ef  
        ClearOutputWindow() {_[\k^98>  
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        Print "Merging RPC Photonics BSDF Data Files" ~&{LMf  
        SetTextColor(255,0,0) !I)wI~XF)5  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." %OT} r  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." u]`ur#_  
        SetTextColor(0,0,0) +t[i68,%  
    4 s&9A/&pC  
        'Current directory of this script (should be the same as the text files being merged) C[c^zn  
        Dim cDir As String ?OD43y1rzd  
        cDir = MacroDir$ & "\"  {@E(p4W  
    cI #! Y  
        'Array which will be populated with the list of files to be merged 'j&+Pg)@  
        Dim fList() As String, curFile As String mqrV:3}  
        GetFileList( cDir, fList ) k z{_H`5.  
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        Print "" R-[t 4BHn  
        Print "Files found for merging:" `%@| sK2  
        For Each curFile In fList &[#iM0;)W0  
            Print Chr(9) & curFile "fH"U1Bw  
        Next HdR%n  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. F4:giu ht  
        Dim nameArray() As String, sampName As String HuB\92u  
        nameArray = Split(fList(0)," 0-0.txt") ;nx? 4f+6h  
        sampName  = nameArray(0) M?[~_0_J  
        Print "" ?mq<#/qb  
        Print "Sample name: " & Chr(9) & sampName glL.CkJ  
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        'Open an output file and write the FRED header data <&47W  
        Dim outFile As String I_"Kh BM  
        outFile = cDir & sampName & "_FRED.txt" og$%`o:{  
        Open outFile For Output As #1 3{/[gX9  
        Print #1, "type bsdf_data" J}?:\y<  
        Print #1, "format angles=deg bsdf=value scale=1" sQl`0|VH  
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        'Loop the file list, skip the two header lines and write the remaining data to file 9fhgCu]$  
        Dim lineArray() As String, curLine As Long AhA4IOG`.  
        For Each curFile In fList F<9S,  
            Print "Merging data from file " & curFile \A%s" O/  
            ReadFile( cDir & curFile, lineArray ) #0uD&95<  
            For curLine = 2 To UBound(lineArray) Q |1-j  
                Print #1, lineArray(curLine) Z23*`yR  
            Next SI"y&[iw  
        Next .e Jt]K  
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        'Close the output file ^.?5!9U  
        Close #1 \""sf{S9  
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        Print "Finished merging RPC data for sample " & sampName d&G#3}kOb%  
        Print "FRED formatted data file: " & Chr(9) & outFile kZU v/]Y.  
    End Sub \:/~IZdzF  
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    'Utility function to read the contents of a file into an array of strings. }K3!ujvR  
    Function ReadFile(ByVal fileName As String, _ 4z*An}ol]  
                      ByRef lineArray() As String) As Long JlMD_pA  
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        ReadFile = -1 yRdME>_L  
        Dim oFSO As Object L `6 R  
        Set oFSO = CreateObject("Scripting.FileSystemObject") e6y,)W"WW2  
        Erase lineArray ]>T4\?aC  
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        Dim fid As Long iD"9,1@~n  
        If oFSO.fileexists( fileName ) Then h8zl\  
            fid = FreeFile() i pi^sCYp  
            Open fileName For Input As fid c7~>uNgJ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) .?^a|]  
            Close fid Uja`{uc  
        End If 9L+g;Js$4  
        Set oFSO = Nothing DnI31!+y  
        Return UBound( lineArray ) > 3SZD  
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    End Function 2Y-NxW^]  
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    Sub GetFileList( ByVal in_dir As String, _ H="E#AC%8/  
                     ByRef in_flist() As String ) sc)}r_|g  
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        'Redimension the file list array }:zTz% _K  
        Erase in_flist XI/LVP,.  
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        'Tracks how many files are found WETnrA"N  
        Dim fCount As Long \LbBK ~l-I  
        fCount = 0 -#agWqUM|T  
    BK/_hNz  
        'Recurse directory and search for text files PYhRP00}M  
        Dim f As String q  W"  
        f = Dir$(in_dir & "*.txt") duT'$}2@>  
        While f <> "" kWW$*d$  
            ReDim Preserve in_flist(fCount) 9Z!|oDP-  
            in_flist(fCount) = f VxTrL}{(6  
            fCount += 1 QHmF,P  
            f = Dir$() Yn+d!w<3:  
        Wend @;1Ym\zc  
        ReDim Preserve in_flist(fCount-1) Nfo`Q0\[P  
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    End Sub [,?5}'we  
     
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