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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2025-07-22
    摘要 JKy~'>Q  
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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 ci/qm\JI<<  
    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。 @_W13@|  
    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。 \0vs93>?  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 gA% A})  
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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。 vn!3Z!dm(  
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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) sN2m?`?"G  
    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 BC\W`K  
    例如下所示: Gp+\}<^ Z  
    Sample name:  EDF-C1-56 `'&mO9,<-  
    Merging data from file EDF-C1-56 0-0.txt :HwdXhA6  
    Finished merging RPC data for sample EDF-C1-56 Ln t 1  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt HUAYtUBH  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 H5 V>d  
    a. 创建一个新的散射库 x/wgD'?  
    b. 散射模型命名 V )1.)XC  
    c. 改变散射模型为“Tabulated BSDF”. dfKGO$}V  
    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 ) vbd)L$$20+  
    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。 W)J MV  
    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 /|<S D.:  
    g. 点击OK &GkD5b  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 *HUXvX|-%  
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    脚本代码 )RT?/NW  
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    '#Language "WWB-COM" Pq8oK'z -  
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    Option Explicit |cgjn*a?M  
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    Sub Main Y;%LwDC  
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        'Cleanup CtV|oeJ  
        ClearOutputWindow() r-TrA$k  
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        Print "Merging RPC Photonics BSDF Data Files" T&+3Xi:  
        SetTextColor(255,0,0) } Z FoCMM  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." q6w)zTpJGJ  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." yNow hh  
        SetTextColor(0,0,0) {\CWoFht>  
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        'Current directory of this script (should be the same as the text files being merged) yCav;ZS_  
        Dim cDir As String V7r_Ubg@K  
        cDir = MacroDir$ & "\" 8'jt59/f  
    ) $b F*  
        'Array which will be populated with the list of files to be merged u!5q)>Wt(  
        Dim fList() As String, curFile As String MP)Prl>  
        GetFileList( cDir, fList ) Nw$OJ9$L>  
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        Print "" 7QNx*8p  
        Print "Files found for merging:" Q;w [o  
        For Each curFile In fList DXI4DM"15I  
            Print Chr(9) & curFile Z,e|L4&  
        Next v/9ZTd  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. peBHZJ``RX  
        Dim nameArray() As String, sampName As String $!MP0f\q g  
        nameArray = Split(fList(0)," 0-0.txt") #dL,d6a  
        sampName  = nameArray(0) wbrOL(q.m  
        Print "" ( _6j@?u  
        Print "Sample name: " & Chr(9) & sampName 6PYt>r&TO  
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        'Open an output file and write the FRED header data fmj}NV&ma  
        Dim outFile As String _.Hj:nFHz  
        outFile = cDir & sampName & "_FRED.txt"  Ux*xz|^  
        Open outFile For Output As #1 )9_W"'V  
        Print #1, "type bsdf_data" G3io!XM)D  
        Print #1, "format angles=deg bsdf=value scale=1" "Zh,;)hS  
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        'Loop the file list, skip the two header lines and write the remaining data to file nPdkvs   
        Dim lineArray() As String, curLine As Long ^tGAJ_b 79  
        For Each curFile In fList cZ|*Zpk  
            Print "Merging data from file " & curFile 41<h|WA  
            ReadFile( cDir & curFile, lineArray ) DxNob-F r  
            For curLine = 2 To UBound(lineArray) 5\C(2naf  
                Print #1, lineArray(curLine) &)tiO>B^6  
            Next 4@3\Ihv  
        Next Dg.~"h5mT  
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        'Close the output file r=0PW_r:  
        Close #1 # o/;du  
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        Print "Finished merging RPC data for sample " & sampName ?.Vuet  
        Print "FRED formatted data file: " & Chr(9) & outFile (WC =om  
    End Sub JX&]>#6|E  
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    'Utility function to read the contents of a file into an array of strings. ~6n|GxR.[  
    Function ReadFile(ByVal fileName As String, _ A{ T9-f@X  
                      ByRef lineArray() As String) As Long  ~d eS*  
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        ReadFile = -1 s_/@`kd{  
        Dim oFSO As Object xOKJOl  
        Set oFSO = CreateObject("Scripting.FileSystemObject") iv_3R}IbX  
        Erase lineArray 9)v]jk  
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        Dim fid As Long s(3u\#P  
        If oFSO.fileexists( fileName ) Then 5@%Gq)z5  
            fid = FreeFile() F\xIVY  
            Open fileName For Input As fid -LRx}Mb9  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) DZ2gnRg  
            Close fid " $farDDoF  
        End If ;&=CZ6vH  
        Set oFSO = Nothing -d'F KOD  
        Return UBound( lineArray ) O U7OX]h  
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    End Function Z40k>t D  
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    Sub GetFileList( ByVal in_dir As String, _ x}K|\KXy  
                     ByRef in_flist() As String ) c=\_[G(  
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        'Redimension the file list array w/o^OjwQ  
        Erase in_flist e8> X5  
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        'Tracks how many files are found `)y ;7%-  
        Dim fCount As Long RNw#s R  
        fCount = 0 W`9{RZ'  
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        'Recurse directory and search for text files k{;?>=FH!  
        Dim f As String S;#:~?dU  
        f = Dir$(in_dir & "*.txt") I2CI9,0  
        While f <> "" Y QC.jnb2  
            ReDim Preserve in_flist(fCount) )yb~ kbe  
            in_flist(fCount) = f z_xy*Iif  
            fCount += 1 Ur< (TM  
            f = Dir$() 5 l8F.LtO\  
        Wend L]z8'n,  
        ReDim Preserve in_flist(fCount-1) dNf9,P_}  
    !`=iKe&%E  
    End Sub 6/L[`n"G  
     
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