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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: K.6xNQl{}  
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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: 0I>[rxal  
    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。 {`[u XH?3d  
    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。 &$_#{?dPt  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 eHI7= [h  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 `T$CUlt6  
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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) OYNPZRu  
    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 Twr<MXa  
    例如下所示: HVcd< :g0  
    Sample name:  EDF-C1-56 /'>#1J|TlK  
    Merging data from file EDF-C1-56 0-0.txt 'B$qq[l]S  
    Finished merging RPC data for sample EDF-C1-56 ,W~a%8*  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt YW)& IA2  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 5y|/}D>  
    a. 创建一个新的散射库 28PT1 9&  
    b. 散射模型命名 C<\O;-nHH  
    c. 改变散射模型为“Tabulated BSDF”. L\H,cimN  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) EU-=\Y  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 qUF}rl S=r  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, c{s%kVOzg  
    g. 点击OK  -!z,t7!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0 6S-3bis  
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    脚本代码: QBfsdu<@^  
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    '#Language "WWB-COM" a).bk!G  
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    Option Explicit )mMHwLDwH  
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    Sub Main ?Wm.'S'to  
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        'Cleanup 5n'C6q "  
        ClearOutputWindow() .I&]G  
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        Print "Merging RPC Photonics BSDF Data Files" L z'05j3!  
        SetTextColor(255,0,0) 7 -hSso.'  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." -hIDL'5u-I  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Ju"*>66  
        SetTextColor(0,0,0) NbtNu$%t  
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        'Current directory of this script (should be the same as the text files being merged) gLef6q{}  
        Dim cDir As String  XVKR}I  
        cDir = MacroDir$ & "\" @< @\CiM  
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        'Array which will be populated with the list of files to be merged wLf=a^c#  
        Dim fList() As String, curFile As String k6vY/)-S  
        GetFileList( cDir, fList ) =c,m)\u/8  
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        Print "" 3tlA! e  
        Print "Files found for merging:" LL1HDG >l  
        For Each curFile In fList c`(]j w  
            Print Chr(9) & curFile _pv<_ Sm  
        Next [9E<z2H  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?=;dNS@i@  
        Dim nameArray() As String, sampName As String _ ecKX</Q  
        nameArray = Split(fList(0)," 0-0.txt") v<z%\`y  
        sampName  = nameArray(0) {-( B  
        Print "" v~N8H+! d  
        Print "Sample name: " & Chr(9) & sampName M#Vl{ b  
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        'Open an output file and write the FRED header data jz_\B(m9%  
        Dim outFile As String `4'['x  
        outFile = cDir & sampName & "_FRED.txt" [C]u!\(IF  
        Open outFile For Output As #1 H"H&uA9"  
        Print #1, "type bsdf_data" B|-E3v:f 4  
        Print #1, "format angles=deg bsdf=value scale=1" `eat7O  
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        'Loop the file list, skip the two header lines and write the remaining data to file sILkTzs w  
        Dim lineArray() As String, curLine As Long BiQ7r=Dd.  
        For Each curFile In fList R30{/KK  
            Print "Merging data from file " & curFile V3'QA1$  
            ReadFile( cDir & curFile, lineArray ) ?th`5K30  
            For curLine = 2 To UBound(lineArray) Xx~XW ^lsh  
                Print #1, lineArray(curLine) ]C =+  
            Next 0?]*-wvp  
        Next BK>uJv-qU  
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        'Close the output file rkdwGqG  
        Close #1 piE9qXn  
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        Print "Finished merging RPC data for sample " & sampName ).0h4oHSj  
        Print "FRED formatted data file: " & Chr(9) & outFile C%8jWc  
    End Sub = X?jId{  
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    'Utility function to read the contents of a file into an array of strings. ceDe!Iu  
    Function ReadFile(ByVal fileName As String, _ !tkP!%w  
                      ByRef lineArray() As String) As Long -t, .A/?  
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        ReadFile = -1 @3/.W+  
        Dim oFSO As Object [.O 3z*[9#  
        Set oFSO = CreateObject("Scripting.FileSystemObject") UC)-Fd  
        Erase lineArray iol.RszlZ|  
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        Dim fid As Long 0^VA,QkQ\  
        If oFSO.fileexists( fileName ) Then jrGVC2*rD  
            fid = FreeFile() )6# i>c-  
            Open fileName For Input As fid $okGqu8z.O  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0Bx.jx0?  
            Close fid _u$X.5Q;  
        End If 2 w2JFdm  
        Set oFSO = Nothing Yl[GO}M  
        Return UBound( lineArray ) 8-Ik .,}  
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    End Function '"{ IV  
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    Sub GetFileList( ByVal in_dir As String, _ H]5%"(h  
                     ByRef in_flist() As String ) P%hi*0pwZ  
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        'Redimension the file list array A ^YHtJ  
        Erase in_flist <QGf9{m  
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        'Tracks how many files are found "oX@Z^  
        Dim fCount As Long 9*gD;)!  
        fCount = 0 KS($S( Fi  
    &u-H/C U%  
        'Recurse directory and search for text files FI1R7A  
        Dim f As String Qo>V N`v  
        f = Dir$(in_dir & "*.txt") Yb8o`j+t  
        While f <> "" B[:-SWd  
            ReDim Preserve in_flist(fCount) m&xyw9a  
            in_flist(fCount) = f ` V}e$  
            fCount += 1 qk pnXQ  
            f = Dir$() @#q>(Ox%  
        Wend IP'gN-#i  
        ReDim Preserve in_flist(fCount-1) P!q U8AJkt  
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    End Sub qy1$(3t$  
     
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