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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: 07-22
    摘要 3uG5b8?  
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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 [F[<2{FQF  
    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。 IFofF Xv_  
    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。 <9tG_  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 VDjIs UUX  
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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。 ,ri--<  
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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) )}\@BtcjA]  
    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 aEdJri  
    例如下所示: To%*)a  
    Sample name:  EDF-C1-56 59BHGvaF  
    Merging data from file EDF-C1-56 0-0.txt 6FIoWG"x  
    Finished merging RPC data for sample EDF-C1-56 :gaeb8`t  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt KqUSTR1e[  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 T KL(97)<  
    a. 创建一个新的散射库 {59VS Nl  
    b. 散射模型命名 :42;c:85  
    c. 改变散射模型为“Tabulated BSDF”. U]EuDNkO{  
    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 ) `4$Qv'X*  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 A<CXdt+t  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 <O)X89dFM  
    g. 点击OK 1\{U<Oli  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 R6Z}/m  
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    脚本代码 y{I[}$k  
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    '#Language "WWB-COM" ^*ez j1  
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    Option Explicit jP.b oj_u*  
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    Sub Main N z3%}6F:  
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        'Cleanup )^>XZ*eK  
        ClearOutputWindow() !v4j`A;%  
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        Print "Merging RPC Photonics BSDF Data Files"  {%~4RZA  
        SetTextColor(255,0,0) 4'hcHdL9   
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ?&<o_/`-H5  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." )Z]y.W)  
        SetTextColor(0,0,0) J[Yg]6  
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        'Current directory of this script (should be the same as the text files being merged) <6O _t,K]  
        Dim cDir As String h 4.=sbzZ  
        cDir = MacroDir$ & "\" U;Ll.BFP  
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        'Array which will be populated with the list of files to be merged chMc(.cN0  
        Dim fList() As String, curFile As String ^N2M/B|0  
        GetFileList( cDir, fList ) Z*9]:dG:!  
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        Print "" i|]Va44  
        Print "Files found for merging:" b'oGt,  
        For Each curFile In fList oYh<k  
            Print Chr(9) & curFile Li-(p"  
        Next G!VF*yW8  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [kuVQ$)  
        Dim nameArray() As String, sampName As String *xo;pe)9  
        nameArray = Split(fList(0)," 0-0.txt") #DK3p0d  
        sampName  = nameArray(0) !MJe+.  
        Print "" ,WB_C\.#XN  
        Print "Sample name: " & Chr(9) & sampName 9kX=99kf[  
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        'Open an output file and write the FRED header data sId(PT^  
        Dim outFile As String 71.\`'  
        outFile = cDir & sampName & "_FRED.txt" ^L-w(r62<  
        Open outFile For Output As #1 z1'FmwT  
        Print #1, "type bsdf_data" k8 ;uC~L  
        Print #1, "format angles=deg bsdf=value scale=1" ) {  
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        'Loop the file list, skip the two header lines and write the remaining data to file o!toO&=  
        Dim lineArray() As String, curLine As Long h#m:Y~GoF  
        For Each curFile In fList GKyG #Fl  
            Print "Merging data from file " & curFile $~,}yh;  
            ReadFile( cDir & curFile, lineArray ) %t~SOkx  
            For curLine = 2 To UBound(lineArray) (e8G (  
                Print #1, lineArray(curLine) o`\.I&Ij  
            Next  Vp] D  
        Next ]KXMGH_  
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        'Close the output file t `Y!"l  
        Close #1 '{0[&i*  
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        Print "Finished merging RPC data for sample " & sampName <wt$Gglk  
        Print "FRED formatted data file: " & Chr(9) & outFile /$9BPjO{  
    End Sub BU9J_rCIv  
    ) Ab6!"'  
    'Utility function to read the contents of a file into an array of strings. cZgMA8 F  
    Function ReadFile(ByVal fileName As String, _ 2sqm7th  
                      ByRef lineArray() As String) As Long ',JrY)  
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        ReadFile = -1 Lvi[*une|  
        Dim oFSO As Object gE@$~Q>M  
        Set oFSO = CreateObject("Scripting.FileSystemObject") /BMtcCPG!  
        Erase lineArray Ts(t:^  
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        Dim fid As Long )_77>f%  
        If oFSO.fileexists( fileName ) Then l@N;sI<O-  
            fid = FreeFile() l801` ~*gO  
            Open fileName For Input As fid JAlU%n?R  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) !8Z2X!$m{<  
            Close fid 6X7s 4  
        End If g@@&sB-A"  
        Set oFSO = Nothing F<Hqo>G  
        Return UBound( lineArray ) sn-)(XU!  
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    End Function x" 'KW (  
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    Sub GetFileList( ByVal in_dir As String, _ u R\m`  
                     ByRef in_flist() As String ) k7^R,.c@  
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        'Redimension the file list array )?w&oIj5  
        Erase in_flist &:V@2_6"  
    \Z)#lF|^  
        'Tracks how many files are found T&r +G!2  
        Dim fCount As Long nW4Vct  
        fCount = 0 hCzjC|EO~  
    W.A1m4l58R  
        'Recurse directory and search for text files E@w[&#  
        Dim f As String r^$\t0h(U8  
        f = Dir$(in_dir & "*.txt") Ue(r} *  
        While f <> "" E'5Ajtw;  
            ReDim Preserve in_flist(fCount) 2Co@+I[,4&  
            in_flist(fCount) = f ajn-KG!A  
            fCount += 1 "~u_\STn <  
            f = Dir$() iQt!PMF.  
        Wend R? O-x9  
        ReDim Preserve in_flist(fCount-1) TH|?X0b  
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    End Sub '_B_&is  
     
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