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    [分享]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: 2020-12-15
    摘要 Lv>OBHD  
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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 L$@qEsO  
    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。 zw0u|q;#  
    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。 l(8@?t^;  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 <9S5  
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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,An'H  
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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) <Kk?BRxi  
    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 (Y  
    例如下所示: &pH XSU  
    Sample name:  EDF-C1-56 .lGN Fx  
    Merging data from file EDF-C1-56 0-0.txt jM>;l6l  
    Finished merging RPC data for sample EDF-C1-56 -(zw80@&  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt C-&s$5MzGb  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 5a:YzQ4  
    a. 创建一个新的散射库 O ]t)`+%q  
    b. 散射模型命名 N,&bBp  
    c. 改变散射模型为“Tabulated BSDF”. 'T]Ok\  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt )  ">q?(i\  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 %]o/p_<  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 O{EbL5p  
    g. 点击OK 6Z;D`X,5  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 eRg;)[#0>$  
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    脚本代码 &x/Z {ut  
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    '#Language "WWB-COM" &Zo+F]3d  
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    Option Explicit ozl>Au  
    !4$-.L)#  
    Sub Main ~oRT@E  
    (w Q,($@  
        'Cleanup <,J O  
        ClearOutputWindow() ?8q4texf[  
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        Print "Merging RPC Photonics BSDF Data Files" fH% C&xj'&  
        SetTextColor(255,0,0) Lv *USN  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." /$j,p E=  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." (Vt5@25JW  
        SetTextColor(0,0,0) \+<=O`  
    3w+ +F@(  
        'Current directory of this script (should be the same as the text files being merged) G9CL}=lJ,  
        Dim cDir As String 0"i QHi  
        cDir = MacroDir$ & "\" 8Y;2.Z`Rz  
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        'Array which will be populated with the list of files to be merged BfQ#5  
        Dim fList() As String, curFile As String 0bjZwC4J  
        GetFileList( cDir, fList ) ' ?EG+o8  
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        Print "" hPt=j{aJ%<  
        Print "Files found for merging:" w} r mYQ  
        For Each curFile In fList 7Kt i&T  
            Print Chr(9) & curFile LftzW{>gI"  
        Next }{.V^;  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. H`7T;`Yb  
        Dim nameArray() As String, sampName As String J$ &2GAi  
        nameArray = Split(fList(0)," 0-0.txt") ^%qQ)>I=j  
        sampName  = nameArray(0) 3Q_)Xs r`  
        Print "" hO(A_Bw  
        Print "Sample name: " & Chr(9) & sampName Hh%|}*f_,  
    MF +F8h>/  
        'Open an output file and write the FRED header data @ZtvpL}e  
        Dim outFile As String gKRlXVS  
        outFile = cDir & sampName & "_FRED.txt" S0;s 7X#c  
        Open outFile For Output As #1 5E2T*EXSh  
        Print #1, "type bsdf_data"  xC2y/ ?  
        Print #1, "format angles=deg bsdf=value scale=1" ,N8SP 'R  
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        'Loop the file list, skip the two header lines and write the remaining data to file %%lJyLq'Vk  
        Dim lineArray() As String, curLine As Long ~_ko$(;A  
        For Each curFile In fList 4cDe'9 LA  
            Print "Merging data from file " & curFile <M\#7.](  
            ReadFile( cDir & curFile, lineArray ) +aOX{1w  
            For curLine = 2 To UBound(lineArray) L"( {6H  
                Print #1, lineArray(curLine) /=KEM gI?  
            Next 4"Mq]_D  
        Next t5EYu*  
    mA5sK?W  
        'Close the output file COA>y?  
        Close #1 hdYd2 j  
    SI7r `'7A'  
        Print "Finished merging RPC data for sample " & sampName \sS0@gnDI  
        Print "FRED formatted data file: " & Chr(9) & outFile U+ V yH4"  
    End Sub ?F|F~A8dr  
    ex|h&Vma2V  
    'Utility function to read the contents of a file into an array of strings. ne=CN!=  
    Function ReadFile(ByVal fileName As String, _ ~FnY'F<35  
                      ByRef lineArray() As String) As Long c>wn e\(5H  
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        ReadFile = -1 KuMH,rXF  
        Dim oFSO As Object 2FEi-m}  
        Set oFSO = CreateObject("Scripting.FileSystemObject") MK <\:g  
        Erase lineArray 5]2 p>%G  
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        Dim fid As Long ccy q~  
        If oFSO.fileexists( fileName ) Then TmJXkR.5  
            fid = FreeFile() >&Y\g?Z6G  
            Open fileName For Input As fid "MyMByomQ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ME*A6/h  
            Close fid -6# _t  
        End If Sea6xGdq  
        Set oFSO = Nothing jH37{S-  
        Return UBound( lineArray ) zEw~t&:e  
    (dHjf;  
    End Function +(h{ 3Y|  
    5e&;f  
    Sub GetFileList( ByVal in_dir As String, _ A&X XL~yH  
                     ByRef in_flist() As String ) 2j$~lI  
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        'Redimension the file list array 2g;Id.i>  
        Erase in_flist STz@^A  
    ?)7UqVyq  
        'Tracks how many files are found ~Sx\>wBlc  
        Dim fCount As Long ix5<h }  
        fCount = 0 Tb{RQ?Nw'  
    i$CF*%+t  
        'Recurse directory and search for text files 40 zO4  
        Dim f As String 0KjCM4t  
        f = Dir$(in_dir & "*.txt") C4gzg  
        While f <> "" ]^<\a=U  
            ReDim Preserve in_flist(fCount) c~!ETwpHQ  
            in_flist(fCount) = f =D)ADZ\<r  
            fCount += 1 M0%nGpVj>  
            f = Dir$() & 5QvUn  
        Wend KIY9?B=+  
        ReDim Preserve in_flist(fCount-1) qpq(<  
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    End Sub ts r{-4V  
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