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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 Lbsr_*4t  
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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 3?@?-q2g  
    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。 Z^*NnL.'  
    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。 Z["BgEJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 5/ * >v  
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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。 +}U2@03I  
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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) ETO$9}x[  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 1[s0Lz  
    例如下所示: g_vm&~U/'  
    Sample name:  EDF-C1-56 O#:&*Mv  
    Merging data from file EDF-C1-56 0-0.txt \_ 9rr6^ "  
    Finished merging RPC data for sample EDF-C1-56 e #M iaX  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4jGLAor|  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 oNIFx5*Z  
    a. 创建一个新的散射库 U-g9C.  
    b. 散射模型命名 m2O&2[g  
    c. 改变散射模型为“Tabulated BSDF”. 3cixQzb}u  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 3;l"=#5  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 W Y:s gG  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 B.*"Xfr8  
    g. 点击OK K &dT(U  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )7Ixz1I9g  
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    脚本代码 f-D>3qSS  
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    '#Language "WWB-COM" ^A!$i$NON  
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    Option Explicit 'zxoRc-b@N  
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    Sub Main  %w5[*V  
    / M@ PO"  
        'Cleanup 6/1$< !WH  
        ClearOutputWindow() Pl78fs"L@  
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        Print "Merging RPC Photonics BSDF Data Files" -DCa   
        SetTextColor(255,0,0) RJ}#)cT  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." h1f8ktF  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ]JMl|e  
        SetTextColor(0,0,0) #epy%>  
    5I' d PNf  
        'Current directory of this script (should be the same as the text files being merged) p3yU:q#A  
        Dim cDir As String S GM!#K  
        cDir = MacroDir$ & "\" 1'O0`Me>#  
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        'Array which will be populated with the list of files to be merged E\$C/}T  
        Dim fList() As String, curFile As String $Q/Ya@o  
        GetFileList( cDir, fList ) 0+`Pg  
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        Print "" ;LMWNy4  
        Print "Files found for merging:" t&}6;z 3  
        For Each curFile In fList Yb:pAzw6  
            Print Chr(9) & curFile _Y!sVJ){,c  
        Next E FY@Y[  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /!T> b:0  
        Dim nameArray() As String, sampName As String Z<"K_bj   
        nameArray = Split(fList(0)," 0-0.txt") 4l @)K9F  
        sampName  = nameArray(0) |/T43ADW  
        Print "" fdv`7u+}a  
        Print "Sample name: " & Chr(9) & sampName ROdK8*jL  
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        'Open an output file and write the FRED header data n:4uA`Vg  
        Dim outFile As String v(O=IUa  
        outFile = cDir & sampName & "_FRED.txt" 8l>CR#%@C  
        Open outFile For Output As #1 4["&O=:d  
        Print #1, "type bsdf_data" xs!p|  
        Print #1, "format angles=deg bsdf=value scale=1" X?o( b/F -  
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        'Loop the file list, skip the two header lines and write the remaining data to file Xy7Z38G  
        Dim lineArray() As String, curLine As Long P8I*dvu _  
        For Each curFile In fList |d}MxS`^  
            Print "Merging data from file " & curFile \40 YGFO  
            ReadFile( cDir & curFile, lineArray ) c/aup  
            For curLine = 2 To UBound(lineArray) 0rE(p2  
                Print #1, lineArray(curLine) )/|6'L-2  
            Next JTW)*q9a  
        Next 6`\ya@  
    2]WE({P  
        'Close the output file P Sx304  
        Close #1 \Fb| {6+  
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        Print "Finished merging RPC data for sample " & sampName i8PuC^]  
        Print "FRED formatted data file: " & Chr(9) & outFile uk7'K 0j  
    End Sub -<f;l _(  
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    'Utility function to read the contents of a file into an array of strings. jirbUl  
    Function ReadFile(ByVal fileName As String, _ Wa'sZ#  
                      ByRef lineArray() As String) As Long {9 PR()_  
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        ReadFile = -1 %f ju G  
        Dim oFSO As Object %0-wpuHc(]  
        Set oFSO = CreateObject("Scripting.FileSystemObject") L%cVykWY"  
        Erase lineArray >e&:`2%.  
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        Dim fid As Long ,mFsM!|  
        If oFSO.fileexists( fileName ) Then ;4#D,zlO^  
            fid = FreeFile() 3,eIB(  
            Open fileName For Input As fid [L~@uAMw:  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0 P|&Pq&IH  
            Close fid NAr1[{^E,  
        End If :k,Q,B.I  
        Set oFSO = Nothing 7Z,/g|s}z  
        Return UBound( lineArray ) L;6.r3bL  
    ;LwqTlJ*[L  
    End Function Nt-<W+,  
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    Sub GetFileList( ByVal in_dir As String, _ NPjv)TN}3  
                     ByRef in_flist() As String ) t+TYb#Tc  
    X%{'<baR  
        'Redimension the file list array slW3qRT\k  
        Erase in_flist V'gw\mcb  
    \wav?;z  
        'Tracks how many files are found !1sU>Xb4J  
        Dim fCount As Long -9Ws=r0R  
        fCount = 0 r/:%}(7;  
    CAc %f9!3  
        'Recurse directory and search for text files ~H /2R  
        Dim f As String XvGA|Ekf<  
        f = Dir$(in_dir & "*.txt") uB.-t^@  
        While f <> "" yy2I2Bv  
            ReDim Preserve in_flist(fCount) sz95i|@/  
            in_flist(fCount) = f 4? (W%?  
            fCount += 1 z;}6f  
            f = Dir$() C;rG]t^%  
        Wend @R2at  
        ReDim Preserve in_flist(fCount-1) -uR72f  
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    End Sub F} DUEDND*  
     
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