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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 (8qMF{  
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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 &&xBq?  
    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。 >t)vQ&:;u  
    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。 ]IoJ(4f  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 4{(uw  
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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。 >E|@3g +2  
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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) MGfDxHg]  
    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 -ZlBg~E  
    例如下所示: R5g -b2Lm  
    Sample name:  EDF-C1-56 81eDN6 M\  
    Merging data from file EDF-C1-56 0-0.txt 7cr@;%#  
    Finished merging RPC data for sample EDF-C1-56 --d<s  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (8TB*BhQ_  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]@Y8! ,  
    a. 创建一个新的散射库 K}tl,MMU  
    b. 散射模型命名 &M,a+|yuY  
    c. 改变散射模型为“Tabulated BSDF”. G+stt(k:  
    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 ) #:s*)(Qn  
    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。 q&Y'zyHLP  
    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 }&I\a  
    g. 点击OK WjW+ EF8(  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 '3 w=D )  
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    脚本代码 9h> nP8  
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    '#Language "WWB-COM" onRxe\?D(  
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    Option Explicit 9un]}7^  
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    Sub Main QO0}-wZR  
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        'Cleanup k{;"Aj:iL  
        ClearOutputWindow() oG M Ls  
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        Print "Merging RPC Photonics BSDF Data Files" e:fp8 k<  
        SetTextColor(255,0,0) )uC],CbW{  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." \ T/i]z  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." WSi`)@.X O  
        SetTextColor(0,0,0) |t+M/C0y/  
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        'Current directory of this script (should be the same as the text files being merged) ^e:C{]S=  
        Dim cDir As String C,~wmS )@  
        cDir = MacroDir$ & "\" ,yus44w[  
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        'Array which will be populated with the list of files to be merged eQu%TZ(x-$  
        Dim fList() As String, curFile As String >J[Bf9)>  
        GetFileList( cDir, fList ) Se<]g$eK?5  
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        Print "" n|2`y?  
        Print "Files found for merging:" m^0r9y,  
        For Each curFile In fList s0uI;WMg  
            Print Chr(9) & curFile wI><kdz  
        Next 2+zE|I.  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Yv k Qh{  
        Dim nameArray() As String, sampName As String ;iR( Ir  
        nameArray = Split(fList(0)," 0-0.txt") =M'M/vKD  
        sampName  = nameArray(0) rqW[B/a{  
        Print "" HM57b>6  
        Print "Sample name: " & Chr(9) & sampName A'r 3%mC  
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        'Open an output file and write the FRED header data kP~'C'5Ys  
        Dim outFile As String rCfr&>nn  
        outFile = cDir & sampName & "_FRED.txt" ~,+n_KST;  
        Open outFile For Output As #1 W,"|([t4.\  
        Print #1, "type bsdf_data" nfpkWyIu{  
        Print #1, "format angles=deg bsdf=value scale=1" o|Cq#JFG  
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        'Loop the file list, skip the two header lines and write the remaining data to file OLh`R]Sd  
        Dim lineArray() As String, curLine As Long t\~lGG-p  
        For Each curFile In fList gw~ %jD-2  
            Print "Merging data from file " & curFile Xou1X$$z  
            ReadFile( cDir & curFile, lineArray ) &7z79#1NS  
            For curLine = 2 To UBound(lineArray) JwCv(1$GM  
                Print #1, lineArray(curLine) L1=3_fO  
            Next AzAD76iNv  
        Next ?&;d#z*4  
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        'Close the output file w}+#w8hu  
        Close #1 X8~dFjhX  
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        Print "Finished merging RPC data for sample " & sampName j1 _ E^  
        Print "FRED formatted data file: " & Chr(9) & outFile 7pMl:\  
    End Sub r@N 0%JZZ  
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    'Utility function to read the contents of a file into an array of strings. !Ic;;<  
    Function ReadFile(ByVal fileName As String, _ .K`OEdr<  
                      ByRef lineArray() As String) As Long A{\#.nC/z  
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        ReadFile = -1 vSty.:bY\p  
        Dim oFSO As Object s2f9 5<B  
        Set oFSO = CreateObject("Scripting.FileSystemObject") b`"E(S/  
        Erase lineArray Q#C;4)e  
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        Dim fid As Long L9tjH C]  
        If oFSO.fileexists( fileName ) Then ZeewGa^r  
            fid = FreeFile() n8<o*f&&9>  
            Open fileName For Input As fid T}} 0hs;  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) AA][}lU:5  
            Close fid [MSLVTR  
        End If 9~+A<X]Hd  
        Set oFSO = Nothing *9:oTN  
        Return UBound( lineArray ) tP; &$y.8  
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    End Function s( @w1tS.  
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    Sub GetFileList( ByVal in_dir As String, _ V]b1cDx{  
                     ByRef in_flist() As String ) 5.gM]si  
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        'Redimension the file list array csn/h$`-@  
        Erase in_flist q6A!xQs<  
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        'Tracks how many files are found m"Y;GzqQl  
        Dim fCount As Long O%)@> 5#S  
        fCount = 0 .G[y^w)w}  
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        'Recurse directory and search for text files [8*Ovd  
        Dim f As String Gvo(iOU  
        f = Dir$(in_dir & "*.txt") .DSn H6O  
        While f <> "" e&[gde(  
            ReDim Preserve in_flist(fCount) >Gbj1>C}  
            in_flist(fCount) = f shW$V93<  
            fCount += 1 ~;St,Fw<<  
            f = Dir$() !:e|M|T'I*  
        Wend >cwyb9;!kK  
        ReDim Preserve in_flist(fCount-1)  }* iag\  
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    End Sub J6x\_]1:*  
     
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