切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 756阅读
    • 0回复

    [技术]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6374
    光币
    26015
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 }n2-*{)x  
    VhH]n yi7D  
    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。
    >Xh(`^}SQ*  
    ot>EnHfV  
    背景 rjpafGCp  
    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。 Kt4\&l-De  
    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。 u7Y'3x,`  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    %.Tf u0M  
    Y)4Nydq  
    c~L6fvS  
    步骤 LD~uI  
    ![P(B0Ct/  
    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。 OJ_2z|f<  
    CI~;B  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    ev: !,}]w  
    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) P8,{k  
    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="&|c=w#L  
    例如下所示: #Z=)=  
    Sample name:  EDF-C1-56 (15Yw9Mv  
    Merging data from file EDF-C1-56 0-0.txt _E&vE5<-$  
    Finished merging RPC data for sample EDF-C1-56 ?_Dnfa_  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'd.@4 9  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,^+R%7mv  
    a. 创建一个新的散射库 iQ]c k-  
    b. 散射模型命名 );uZ4PNK/?  
    c. 改变散射模型为“Tabulated BSDF”. %oCjZ"ke  
    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 ) o4[2`mT  
    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。 s[B6%DI/5  
    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 DCt:EhC  
    g. 点击OK ,@>rubUz  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 u<y\iZ[   
    #c)Ou!Ldb  
    DN 8pJa  
    脚本代码 GY$?^&OO>  
    nog\,NT  
    '#Language "WWB-COM" )p^jsv.  
    CU>K  
    Option Explicit Ae_ E;[mj  
    NX""?"q  
    Sub Main <9@]|  
     hL{B9?  
        'Cleanup sBXk$  
        ClearOutputWindow() S7~F*CGBh  
    ~Yz/t  
        Print "Merging RPC Photonics BSDF Data Files" 2#:]%y;\  
        SetTextColor(255,0,0) iBiA0 W  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." j_WF38o  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." e$^!~+J7  
        SetTextColor(0,0,0) $}UJs <-F  
    YlcF-a  
        'Current directory of this script (should be the same as the text files being merged) N evvA(M  
        Dim cDir As String q\HBAr y  
        cDir = MacroDir$ & "\" L{0OMyUA  
    T17LYHIT  
        'Array which will be populated with the list of files to be merged 8`~3MsE"  
        Dim fList() As String, curFile As String 5NF&LM;i(  
        GetFileList( cDir, fList ) oplA'Jgnv  
    rU^ghF  
        Print "" W>|b98NPu  
        Print "Files found for merging:" iM/0Yp-v'>  
        For Each curFile In fList Isgk  
            Print Chr(9) & curFile x[>_I1TJ  
        Next 8(f0|@x^  
    K y4y  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. p;t!"I:`?  
        Dim nameArray() As String, sampName As String dDn4nwH  
        nameArray = Split(fList(0)," 0-0.txt") }~C ZqIP  
        sampName  = nameArray(0) qf=[*ZY  
        Print "" f>+}U;)EF  
        Print "Sample name: " & Chr(9) & sampName RHAr[$  
    x-#9i  
        'Open an output file and write the FRED header data R"t$N@ZFb  
        Dim outFile As String Xsn- +e  
        outFile = cDir & sampName & "_FRED.txt" bfI -!,  
        Open outFile For Output As #1 f -nC+   
        Print #1, "type bsdf_data" %dU'$)  
        Print #1, "format angles=deg bsdf=value scale=1" k Z[yv  
    WI!z92qq[  
        'Loop the file list, skip the two header lines and write the remaining data to file j6HbJ#]  
        Dim lineArray() As String, curLine As Long +,^M{^%  
        For Each curFile In fList r= | |sZs  
            Print "Merging data from file " & curFile *Z2Q]?:{ i  
            ReadFile( cDir & curFile, lineArray ) f vM3.P  
            For curLine = 2 To UBound(lineArray) molowPI  
                Print #1, lineArray(curLine) : RO:k|g  
            Next 1V3J:W#;  
        Next *g41"Cl  
    *3 8Y;{ 4  
        'Close the output file >T^v4A  
        Close #1 ZWW8Hr  
    Msu2OF *x  
        Print "Finished merging RPC data for sample " & sampName <~X6D?  
        Print "FRED formatted data file: " & Chr(9) & outFile `oWjq6  
    End Sub nJ})6/gK  
    1p<?S}zg@  
    'Utility function to read the contents of a file into an array of strings. <\~#\A=;  
    Function ReadFile(ByVal fileName As String, _ iC+H;s5<  
                      ByRef lineArray() As String) As Long |M>k &p,B-  
    knzED~ v@(  
        ReadFile = -1 OYp8r  
        Dim oFSO As Object 3}1+"? s  
        Set oFSO = CreateObject("Scripting.FileSystemObject") B[|/wHMsT}  
        Erase lineArray ZDmk<}A-U  
    BvR3Oi@Wc  
        Dim fid As Long j77}{5@p  
        If oFSO.fileexists( fileName ) Then v~cW:I  
            fid = FreeFile() L [M8[~Hy  
            Open fileName For Input As fid WA5kX SdIb  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3'e 4{  
            Close fid =xet+;~ji  
        End If {o<p{q  
        Set oFSO = Nothing #p`7gFl  
        Return UBound( lineArray ) QaBXzf   
    /iuNdh  
    End Function A3pQ?d[  
    @}!$NI8  
    Sub GetFileList( ByVal in_dir As String, _ qM !q,Q  
                     ByRef in_flist() As String ) \^LR5S&  
    kP@OIhRe  
        'Redimension the file list array |?=1tS{iT  
        Erase in_flist S IK{GWX  
    '+zsj0!A  
        'Tracks how many files are found }PL  
        Dim fCount As Long {Dq51  
        fCount = 0 P`"DepeD  
    ]m>MB )9  
        'Recurse directory and search for text files d`7] reh  
        Dim f As String 3*JybMo"  
        f = Dir$(in_dir & "*.txt") (Fd4Gw<sq  
        While f <> "" 5&@U T  
            ReDim Preserve in_flist(fCount) S c Kfr  
            in_flist(fCount) = f p<19 Jw<  
            fCount += 1 hI{Yg$H1  
            f = Dir$() L"/ato  
        Wend  m:Abq`C  
        ReDim Preserve in_flist(fCount-1) (Z +C  
    k8V0-.UL}  
    End Sub gNQJ:!  
     
    分享到