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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 : j }fC8'  
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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 RPd}Wf  
    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。 @f]{>OS  
    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。 y\dEk:\)  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Suk  
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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。 : G\<y  
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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) r}[7x]sP  
    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 !$N<ds.  
    例如下所示: < -W*$?^  
    Sample name:  EDF-C1-56 ^uv<6  
    Merging data from file EDF-C1-56 0-0.txt bwiPS1+);  
    Finished merging RPC data for sample EDF-C1-56 A+hT3;lp  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt b)(?qfXWP  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !*6CWV0  
    a. 创建一个新的散射库 7qTE('zt  
    b. 散射模型命名 L|bwZ,M=}?  
    c. 改变散射模型为“Tabulated BSDF”. r{l(O,|e  
    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 ) .`>y@p!  
    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。 jReXyRmo({  
    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 <! )**  
    g. 点击OK A\8}|r(>9E  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2^i(gaXUQ  
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    脚本代码 qOIW(D  
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    '#Language "WWB-COM" [1.+H yJ}  
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    Option Explicit R<OI1,..r  
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    Sub Main }.s~T#v  
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        'Cleanup yj^+ G  
        ClearOutputWindow() \hCH>*x<  
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        Print "Merging RPC Photonics BSDF Data Files" As>_J=8} 3  
        SetTextColor(255,0,0) w^t/9Nasi  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." D_vbSF)  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." yn#X;ja-  
        SetTextColor(0,0,0) h: 9Zt0,  
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        'Current directory of this script (should be the same as the text files being merged) _3ZYtmn.  
        Dim cDir As String j_Yp>=+[  
        cDir = MacroDir$ & "\" CHz+814  
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        'Array which will be populated with the list of files to be merged `]%|f  
        Dim fList() As String, curFile As String AM!G1^c  
        GetFileList( cDir, fList ) H)n9O/u  
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        Print "" i-6 Z"b{  
        Print "Files found for merging:" Cg(Y&Gxf.  
        For Each curFile In fList MG.` r{5  
            Print Chr(9) & curFile )= =Jfn y  
        Next <u2}i<#  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @Z12CrJ  
        Dim nameArray() As String, sampName As String b9l;a+]d  
        nameArray = Split(fList(0)," 0-0.txt") Y=Kc'x[,Zj  
        sampName  = nameArray(0) P?k0zwOlBl  
        Print "" `^)jLuyu  
        Print "Sample name: " & Chr(9) & sampName _fKou2$yz  
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        'Open an output file and write the FRED header data Ig f&l`\  
        Dim outFile As String #?S^kM-0  
        outFile = cDir & sampName & "_FRED.txt" sfNE68I2  
        Open outFile For Output As #1 h D/*h*}T>  
        Print #1, "type bsdf_data" Fx2bwut.K  
        Print #1, "format angles=deg bsdf=value scale=1" P09;ng67  
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        'Loop the file list, skip the two header lines and write the remaining data to file JT!9\i  
        Dim lineArray() As String, curLine As Long X<I+&Zi  
        For Each curFile In fList h-[VH%  
            Print "Merging data from file " & curFile J|qZ+A[z  
            ReadFile( cDir & curFile, lineArray ) H*r)Z 90  
            For curLine = 2 To UBound(lineArray) +8RgF   
                Print #1, lineArray(curLine) |E JD3 &  
            Next H["`Mn7j2  
        Next =Lf,?"S  
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        'Close the output file '2 PF  
        Close #1 $adbCY \  
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        Print "Finished merging RPC data for sample " & sampName a m|F?|1  
        Print "FRED formatted data file: " & Chr(9) & outFile JPoN&BTCj  
    End Sub SMpH._VFeE  
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    'Utility function to read the contents of a file into an array of strings. f,kZ\Ia'r  
    Function ReadFile(ByVal fileName As String, _ ?B2] -+Y  
                      ByRef lineArray() As String) As Long |Uc_G13Y{D  
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        ReadFile = -1 $\X[@E S0  
        Dim oFSO As Object ,g2ij  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 2#c<\s|C  
        Erase lineArray &E.^jR~*  
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        Dim fid As Long @`q:IIgW  
        If oFSO.fileexists( fileName ) Then K<>oa[B9  
            fid = FreeFile() B><d9d  
            Open fileName For Input As fid YQj2  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) a,k>Q`  
            Close fid W04@!_) <  
        End If 6WXRP;!Q  
        Set oFSO = Nothing H9YW  
        Return UBound( lineArray ) l1BtI_7p  
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    End Function  : y%d  
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    Sub GetFileList( ByVal in_dir As String, _ X-K=!pET  
                     ByRef in_flist() As String ) DtXrWS/  
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        'Redimension the file list array /_I]H  
        Erase in_flist Rwz0poG`WG  
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        'Tracks how many files are found f4 P8Oz  
        Dim fCount As Long ;f#v0W`5  
        fCount = 0 ~*z% e*EL  
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        'Recurse directory and search for text files Enum/O5  
        Dim f As String Q(wx nm  
        f = Dir$(in_dir & "*.txt") }$SavB#SBP  
        While f <> "" < $J>9k  
            ReDim Preserve in_flist(fCount) v%+:/m1  
            in_flist(fCount) = f 7%Gwc?[x  
            fCount += 1 RP[{4 Q8  
            f = Dir$() hI]Hp3S  
        Wend }wr{W:j  
        ReDim Preserve in_flist(fCount-1) 5m\<U`  
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    End Sub $'BSH4~|.  
     
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