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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 Dr4?Ow  
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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 U&w*Sb"  
    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。 .WxFm@]/\  
    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。 Iz 1*4@  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 -HO6K) ur  
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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。 KteZK.+#:  
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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) @SX%? mk8G  
    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 gvow\9{|C  
    例如下所示: ,ivWVsN*]  
    Sample name:  EDF-C1-56 ]9bh+  
    Merging data from file EDF-C1-56 0-0.txt I8E\'`:<  
    Finished merging RPC data for sample EDF-C1-56 2<`gs(oxXe  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt gt].rwo"  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]L5Z=.z&  
    a. 创建一个新的散射库 ; |E! |w  
    b. 散射模型命名 :< KSf#O  
    c. 改变散射模型为“Tabulated BSDF”. Fm-q=3  
    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 ) ' [7C~r{%  
    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。 wz*)L (pP  
    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 ' lQ  
    g. 点击OK Q' OuZKhA  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 G_7ks]u-  
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    脚本代码 eSQzjR*  
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    '#Language "WWB-COM" !W+p<F1i  
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    Option Explicit N|j;=y!  
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    Sub Main X#f+m) S  
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        'Cleanup =:ya;k&  
        ClearOutputWindow() LZZ:P  
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        Print "Merging RPC Photonics BSDF Data Files" 'p|Iwtjn>  
        SetTextColor(255,0,0) V PLCic,T  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." .O@q5G  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." {GG~E54&B  
        SetTextColor(0,0,0) $Hl+iF4j<  
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        'Current directory of this script (should be the same as the text files being merged) YokZar2a0  
        Dim cDir As String ]ft~OqLg!  
        cDir = MacroDir$ & "\" <MWXew7b  
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        'Array which will be populated with the list of files to be merged 5;sQ@  
        Dim fList() As String, curFile As String Cnc\sMDJ\B  
        GetFileList( cDir, fList ) ]IbPWBX  
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        Print "" Tvksf!ba  
        Print "Files found for merging:" J;Z>fAE7  
        For Each curFile In fList &?5{z\;1"  
            Print Chr(9) & curFile } K hq  
        Next R|Q_W X  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 67K RM(S  
        Dim nameArray() As String, sampName As String N.Wdi  
        nameArray = Split(fList(0)," 0-0.txt") fW4cHB 9|  
        sampName  = nameArray(0) ^! v}  
        Print "" }?Yr>ZRi  
        Print "Sample name: " & Chr(9) & sampName Vm,f3~  
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        'Open an output file and write the FRED header data YKX>@)Dxv  
        Dim outFile As String +ia(%[  
        outFile = cDir & sampName & "_FRED.txt" skC|io-Zv  
        Open outFile For Output As #1 H-\ {w    
        Print #1, "type bsdf_data" LGo@F;!n  
        Print #1, "format angles=deg bsdf=value scale=1" GJ^]ER-K  
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        'Loop the file list, skip the two header lines and write the remaining data to file !7"K>m<  
        Dim lineArray() As String, curLine As Long w?$u!X  
        For Each curFile In fList *3etxnQc  
            Print "Merging data from file " & curFile R6WgA@Z|r  
            ReadFile( cDir & curFile, lineArray ) >kDdWgRQ  
            For curLine = 2 To UBound(lineArray) [K4+G]6  
                Print #1, lineArray(curLine) w;SH>Ax:  
            Next "<jEI /  
        Next r~D~7MNl  
    ,p/b$d1p  
        'Close the output file l SVW}t  
        Close #1 S'-`\%@7  
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        Print "Finished merging RPC data for sample " & sampName ^ Mvsq)  
        Print "FRED formatted data file: " & Chr(9) & outFile )T};Q:  
    End Sub YaJ{"'}  
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    'Utility function to read the contents of a file into an array of strings. gHh.|PysW  
    Function ReadFile(ByVal fileName As String, _ N>nvt.`P  
                      ByRef lineArray() As String) As Long ?lwQne8/  
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        ReadFile = -1 kFIB lPV  
        Dim oFSO As Object vb"dX0)<  
        Set oFSO = CreateObject("Scripting.FileSystemObject") va/4q+1GfH  
        Erase lineArray I\uB"Z{9  
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        Dim fid As Long 9M7(_E;)B  
        If oFSO.fileexists( fileName ) Then 3Llj_lf  
            fid = FreeFile() R$;&O. 5M  
            Open fileName For Input As fid -IE P?NX  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) P7k$^n  
            Close fid ,8"[ /@  
        End If };|PFWs  
        Set oFSO = Nothing _hyxKrm' 6  
        Return UBound( lineArray ) , w'$T)  
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    End Function |Q)w3\S$  
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    Sub GetFileList( ByVal in_dir As String, _ 7" STS7_  
                     ByRef in_flist() As String ) FvNSu"O~K1  
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        'Redimension the file list array JTh =JHJ  
        Erase in_flist 3 cW"VrFy9  
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        'Tracks how many files are found ?6YUb;  
        Dim fCount As Long dbUZGn~  
        fCount = 0 FeeWZe0i  
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        'Recurse directory and search for text files "`3 ^M vC  
        Dim f As String TX [%s@C  
        f = Dir$(in_dir & "*.txt") .q9|XDqQc  
        While f <> "" y" 6~9j  
            ReDim Preserve in_flist(fCount) NDa|.,  
            in_flist(fCount) = f ]|La MMD  
            fCount += 1 T!xy^n]}  
            f = Dir$() '-]BSU  
        Wend .nF  
        ReDim Preserve in_flist(fCount-1) ?M-8Fp3 +  
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    End Sub O-lh\9{'R  
     
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