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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 |~e"i<G#  
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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 jel:oy|_  
    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。 R\5,H!V9n  
    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。 ?a3 wBy  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 B`Z3e%g#  
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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。 b^Z2Vf:k]  
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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) 'RV96lX<  
    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 3e&+[j  
    例如下所示: `P;r[j"  
    Sample name:  EDF-C1-56 J)>DsQ+Cj  
    Merging data from file EDF-C1-56 0-0.txt B=TUZ)  
    Finished merging RPC data for sample EDF-C1-56 ID2->J  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @01.Pd   
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ks P2./N  
    a. 创建一个新的散射库 N:)x67,  
    b. 散射模型命名 7.hBc;%2u  
    c. 改变散射模型为“Tabulated BSDF”. UHZ&7jfl  
    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 ) Q;$k?G=l  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 J:N(U0U  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 YWK0.F,8a  
    g. 点击OK b^$`2m-?@f  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bW6| &P}X  
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    脚本代码 x(TF4W=j  
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    '#Language "WWB-COM" ,Q-,#C"  
    BA c+T  
    Option Explicit /P*XB%y  
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    Sub Main "Xv} l@  
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        'Cleanup @KTuG ?.  
        ClearOutputWindow() a yA;6Qt  
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        Print "Merging RPC Photonics BSDF Data Files" R'k `0  
        SetTextColor(255,0,0) vTK%4=|1}!  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." )XDBK* !  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." =HCEUB9Fs  
        SetTextColor(0,0,0) LL#REK|lm8  
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        'Current directory of this script (should be the same as the text files being merged) teJt.VA7)  
        Dim cDir As String }gkLO TJ/,  
        cDir = MacroDir$ & "\" ]o<]A[<  
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        'Array which will be populated with the list of files to be merged /*qRbN  
        Dim fList() As String, curFile As String ,ErfTg&^  
        GetFileList( cDir, fList ) 1,wcf,  
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        Print "" ='h2z"}\Bn  
        Print "Files found for merging:" @ wR3L:@  
        For Each curFile In fList Y)1/f EM  
            Print Chr(9) & curFile 61S;M8tNv  
        Next e'K~WNT  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /TpTR-\I0  
        Dim nameArray() As String, sampName As String <gF]9%2E  
        nameArray = Split(fList(0)," 0-0.txt") A9.TRKb=8  
        sampName  = nameArray(0) 1p}H,\o  
        Print "" 'dKfXYY1`N  
        Print "Sample name: " & Chr(9) & sampName |T|m5V'l  
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        'Open an output file and write the FRED header data L BbST!  
        Dim outFile As String 62sl6WWS3  
        outFile = cDir & sampName & "_FRED.txt" (03/4*g_s  
        Open outFile For Output As #1 [./FzlAs  
        Print #1, "type bsdf_data" ,&_H  
        Print #1, "format angles=deg bsdf=value scale=1" Hh% !4_AMw  
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        'Loop the file list, skip the two header lines and write the remaining data to file V'i-pn2gyu  
        Dim lineArray() As String, curLine As Long gK rUv0&F  
        For Each curFile In fList R(wUu#n$  
            Print "Merging data from file " & curFile oPKLr31zt  
            ReadFile( cDir & curFile, lineArray ) ?8-Am[xH  
            For curLine = 2 To UBound(lineArray) " @D  
                Print #1, lineArray(curLine) Y*NzY*V\  
            Next Tvx1+0Z%z  
        Next ~&<#H+O  
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        'Close the output file Zonjk%tC  
        Close #1 x"b'Pmw  
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        Print "Finished merging RPC data for sample " & sampName $r!CQ 2S  
        Print "FRED formatted data file: " & Chr(9) & outFile |oPRP1F-;e  
    End Sub '`2KLO>!  
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    'Utility function to read the contents of a file into an array of strings.  pQiC#4b  
    Function ReadFile(ByVal fileName As String, _ a:cci?cb  
                      ByRef lineArray() As String) As Long bT ,_=7F  
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        ReadFile = -1 @su<h\)  
        Dim oFSO As Object iXMJ1\!q\|  
        Set oFSO = CreateObject("Scripting.FileSystemObject")  lbHgxZ  
        Erase lineArray !l%:   
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        Dim fid As Long joe)b  
        If oFSO.fileexists( fileName ) Then b > D  
            fid = FreeFile() Xd(^7~i  
            Open fileName For Input As fid 3x[C pg,  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) I8bM-k):9R  
            Close fid Y ^+x<  
        End If 3]*Kz*i  
        Set oFSO = Nothing +M-tYE 5n  
        Return UBound( lineArray ) D4L&6[W  
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    End Function Pe _O(  
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    Sub GetFileList( ByVal in_dir As String, _ ^ptybVo  
                     ByRef in_flist() As String ) 4#IT" i  
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        'Redimension the file list array J p?XV<3Z  
        Erase in_flist H,(vTthd  
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        'Tracks how many files are found c""&He4zp  
        Dim fCount As Long >$D!mraih  
        fCount = 0 ~Zr}QO}G  
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        'Recurse directory and search for text files m'"r<]pB*4  
        Dim f As String Y9^l|,bm5  
        f = Dir$(in_dir & "*.txt") 0+CcNY9  
        While f <> "" n4{%M  
            ReDim Preserve in_flist(fCount) q/b+V)V  
            in_flist(fCount) = f u$d[&|`>_  
            fCount += 1 KuP#i]Na  
            f = Dir$()  vD#U+  
        Wend G0 )[(s  
        ReDim Preserve in_flist(fCount-1) a`' >VCg  
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    End Sub ce;7  
     
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