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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 0LVE@qEL  
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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  y).P=z  
    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。 LVtu*k   
    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。 _g|acBF  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 >Wi s.e%b  
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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。 e1 a*'T$z  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) [B/0-(?  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 -WR}m6yMr  
    例如下所示: mBl7{w;Iv  
    Sample name:  EDF-C1-56 o"_=K%9  
    Merging data from file EDF-C1-56 0-0.txt hw,^G5m  
    Finished merging RPC data for sample EDF-C1-56 n.$(}A  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (O5)wej   
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2_pz3<,\  
    a. 创建一个新的散射库 `F1dyf!p<  
    b. 散射模型命名 1kFjas `g  
    c. 改变散射模型为“Tabulated BSDF”. ,seFkG@1  
    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 ) jMU9{Si  
    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。 it}-^3A M  
    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 9N Le&o  
    g. 点击OK F$Pp]"82'm  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 b7$}JCn  
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    脚本代码 pMN<p[MB  
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    '#Language "WWB-COM" ^ }#f()  
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    Option Explicit 2V$9ei6  
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    Sub Main `Cj,HI_/*  
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        'Cleanup iQqbzOY  
        ClearOutputWindow() $FCw$+w  
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        Print "Merging RPC Photonics BSDF Data Files" %FS;>;i?  
        SetTextColor(255,0,0) 4(m3c<'P  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Y'_ D<Mp  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 2u&c &G  
        SetTextColor(0,0,0) OK\]*r  
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        'Current directory of this script (should be the same as the text files being merged) lIl9ypikg  
        Dim cDir As String Q-Y@)Mf~?0  
        cDir = MacroDir$ & "\" ~ 7BX@?  
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        'Array which will be populated with the list of files to be merged 4~WlP,,M  
        Dim fList() As String, curFile As String M9g1d7%  
        GetFileList( cDir, fList ) IMR$x(g= F  
    '%O\E{h  
        Print "" X,53c$  
        Print "Files found for merging:" bV7QVu8  
        For Each curFile In fList ^K>pT}u  
            Print Chr(9) & curFile \[E-:  
        Next o}R|tOe  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^z?=?%{  
        Dim nameArray() As String, sampName As String =0Y'f](2eW  
        nameArray = Split(fList(0)," 0-0.txt") %#Q #N,fw  
        sampName  = nameArray(0) .Bijc G  
        Print "" 1 ' %-y  
        Print "Sample name: " & Chr(9) & sampName A'v[SUW'm  
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        'Open an output file and write the FRED header data Z{16S=0  
        Dim outFile As String %>]#vQ|  
        outFile = cDir & sampName & "_FRED.txt" % NwoU%q  
        Open outFile For Output As #1 sp,(&Y]US  
        Print #1, "type bsdf_data" %w%zv2d  
        Print #1, "format angles=deg bsdf=value scale=1" Es,0'\m&  
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        'Loop the file list, skip the two header lines and write the remaining data to file N>T=L0`  
        Dim lineArray() As String, curLine As Long /^WE@r[:  
        For Each curFile In fList .P x,=56$X  
            Print "Merging data from file " & curFile Z~B+*HF  
            ReadFile( cDir & curFile, lineArray ) ^:$j:w?j  
            For curLine = 2 To UBound(lineArray) *xho  
                Print #1, lineArray(curLine) M{y|7e%K  
            Next "URVX1#(r  
        Next -hm 9sNox  
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        'Close the output file ]n/jJ_[  
        Close #1 &<OMGGQ[h  
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        Print "Finished merging RPC data for sample " & sampName 4v i B=>  
        Print "FRED formatted data file: " & Chr(9) & outFile p@`4 Qz  
    End Sub [kQ"6wh8  
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    'Utility function to read the contents of a file into an array of strings. Zj5NWzj X  
    Function ReadFile(ByVal fileName As String, _ $Jt8d|UP  
                      ByRef lineArray() As String) As Long ]lC4+{V  
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        ReadFile = -1 F\l!A'Q+t  
        Dim oFSO As Object 1gO//fdI  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 8~rT  
        Erase lineArray ;%lJD"yF  
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        Dim fid As Long SlM>";C\  
        If oFSO.fileexists( fileName ) Then zbdOCfA;  
            fid = FreeFile() 7Co3P@@  
            Open fileName For Input As fid c lq <$-  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1j8/4:  
            Close fid ">rsA&hN-  
        End If :Fq2x_IUE  
        Set oFSO = Nothing }qTv&Z3$  
        Return UBound( lineArray ) 6i55Ja  
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    End Function (gv=P>:  
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    Sub GetFileList( ByVal in_dir As String, _ kvY} yw7  
                     ByRef in_flist() As String ) QLxXp  
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        'Redimension the file list array B>c[Zg1  
        Erase in_flist V/+H_=|  
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        'Tracks how many files are found })Ix .!p  
        Dim fCount As Long xUV_2n+  
        fCount = 0 & C!g(fS  
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        'Recurse directory and search for text files ZC>`ca  
        Dim f As String .oW~:mY  
        f = Dir$(in_dir & "*.txt") ~M|NzK_9  
        While f <> "" `XFX`1  
            ReDim Preserve in_flist(fCount) iGpK\oH  
            in_flist(fCount) = f j58Dki->.  
            fCount += 1 ~QQEHx\4zZ  
            f = Dir$() `"-`D!U?$  
        Wend j@!BOL~?  
        ReDim Preserve in_flist(fCount-1) #w[q.+A  
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    End Sub T= iZ9w  
     
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