切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1743阅读
    • 0回复

    [分享]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    在线infotek
     
    发帖
    6405
    光币
    26170
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 71c[ `h*0{  
    !V37ePFje  
    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。
    - Fbp!*. u  
    )P:^A9&_n=  
    背景 UDg' s  
    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。 chE!,gik  
    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。 s51$x M  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    k*hl"oL"X  
    #lP8/-s^  
    LJ(WU)CPc  
    步骤 2(xC|  
    2Kz+COP+  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 :OY~Q3 @  
    Vi8A4  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    YNU}R/u6^  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) !rM~   
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 K}R+~<bIY  
    例如下所示: Lqj Qv$  
    Sample name:  EDF-C1-56 )O~[4xV~  
    Merging data from file EDF-C1-56 0-0.txt 5XZ! yYB?  
    Finished merging RPC data for sample EDF-C1-56 y!77gx?-  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt xLz=)k[''  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 (hzN(Dh  
    a. 创建一个新的散射库 pFd8p@m_2  
    b. 散射模型命名 5:h[%3'bB  
    c. 改变散射模型为“Tabulated BSDF”. kW g.-$pp  
    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 ) `@h|+`h  
    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。 my.EvN  
    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 vjGQ!xF  
    g. 点击OK RwWg:4   
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 fe?Z33V  
    Q6@<7E]y  
    (CmK> "C+  
    脚本代码 K T}  
    JQ&t"`\k  
    '#Language "WWB-COM" +T+@g8S  
    |@Tga_0p  
    Option Explicit $"^K~5Q  
    _>;Wz7  
    Sub Main {3tzr;c?  
    Z'JS@dV  
        'Cleanup pN%&`]Wev  
        ClearOutputWindow() nVb@sI{{k  
    |W">&Rb<t#  
        Print "Merging RPC Photonics BSDF Data Files" 7~/cz_  
        SetTextColor(255,0,0) @w[i%F,&`  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ]k0 jmE  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." cj/`m$  
        SetTextColor(0,0,0) \c=I!<9  
    /U~|B.z@6  
        'Current directory of this script (should be the same as the text files being merged) |cPHl+$nh.  
        Dim cDir As String ~&?bU]F  
        cDir = MacroDir$ & "\" %qP[+N&  
    ^OR0Vp>L  
        'Array which will be populated with the list of files to be merged }htjT/Nm  
        Dim fList() As String, curFile As String  QHEtG2  
        GetFileList( cDir, fList ) :d36oiHKu  
    Aw o)a8e  
        Print "" \hB BG8=&  
        Print "Files found for merging:" >qjV{M  
        For Each curFile In fList rl*O-S/  
            Print Chr(9) & curFile 6OES'3Cy  
        Next 'y8{, R4C  
    'X`Z1L/  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )D)5 `n)  
        Dim nameArray() As String, sampName As String wbO6Ag@))  
        nameArray = Split(fList(0)," 0-0.txt") aV3:{oL  
        sampName  = nameArray(0) hRcb}>pr  
        Print "" o`?rj!\  
        Print "Sample name: " & Chr(9) & sampName S&op|Z)1  
    l\HdB"nT  
        'Open an output file and write the FRED header data _"DS?`z6  
        Dim outFile As String I5$P9UE+^9  
        outFile = cDir & sampName & "_FRED.txt" Nk`UQ~g$  
        Open outFile For Output As #1 uy'ghF  
        Print #1, "type bsdf_data" `2~>$Tr  
        Print #1, "format angles=deg bsdf=value scale=1" KhCP9(A=Qo  
    XH:*J+$O  
        'Loop the file list, skip the two header lines and write the remaining data to file E h%61/  
        Dim lineArray() As String, curLine As Long IP~!E_e}\  
        For Each curFile In fList "n-'?W!  
            Print "Merging data from file " & curFile ]$ew 5%  
            ReadFile( cDir & curFile, lineArray ) 092t6D}  
            For curLine = 2 To UBound(lineArray) 0&.CAHb}  
                Print #1, lineArray(curLine) #x%'U}sF  
            Next |D3u"Y!:^  
        Next gt&|T j  
    |.IH4 K  
        'Close the output file X|M!Nt0'  
        Close #1 o_b[*  
    i%glQT  
        Print "Finished merging RPC data for sample " & sampName [&Xp]:M'D  
        Print "FRED formatted data file: " & Chr(9) & outFile TBhM^\z  
    End Sub e _vsiT  
    g(DD8;]w<  
    'Utility function to read the contents of a file into an array of strings. cw;wv+|k  
    Function ReadFile(ByVal fileName As String, _ \>L,X_DL  
                      ByRef lineArray() As String) As Long zd?@xno  
    ZS Med(//b  
        ReadFile = -1 D)_ C@*q  
        Dim oFSO As Object +)Te)^&v%  
        Set oFSO = CreateObject("Scripting.FileSystemObject") q!K :N?  
        Erase lineArray .J#'k+>  
    x^f<G 6z  
        Dim fid As Long ajbe7#}  
        If oFSO.fileexists( fileName ) Then HDyf]2N*N  
            fid = FreeFile() od;-D~  
            Open fileName For Input As fid K,f:X g!:  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) mgxIxusR  
            Close fid w7nt $L5  
        End If Zw]`z*,yRA  
        Set oFSO = Nothing QbU5FPiN  
        Return UBound( lineArray ) dWY%bb  
    Vla,avON  
    End Function E'5*w6  
    vN v?trw  
    Sub GetFileList( ByVal in_dir As String, _ Ku;fZN[g  
                     ByRef in_flist() As String ) yr]ja-Y  
    ;#B(L=/  
        'Redimension the file list array +,Dc0VC?  
        Erase in_flist <sdgL+&1h  
    _iwG'a[`  
        'Tracks how many files are found ;%|im?  
        Dim fCount As Long wAMg"ImJ  
        fCount = 0 B`tq*T%  
    MsB >3  
        'Recurse directory and search for text files Jx*cq;`Vee  
        Dim f As String Gk;YAI  
        f = Dir$(in_dir & "*.txt") Y~~Dg?e  
        While f <> "" +^I0> \  
            ReDim Preserve in_flist(fCount) 6K2e]r  
            in_flist(fCount) = f p_r`"  
            fCount += 1 4Z)4WGp!  
            f = Dir$() 3WV(Ok  
        Wend | %_C$s%  
        ReDim Preserve in_flist(fCount-1) {N(qS'N  
    :\T Mm>%q  
    End Sub Xj?Wvt  
    3)OZf{D[  
    3F9V,zWtTi  
    QQ:2987619807 D?|D)"?qb  
     
    分享到