切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1527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
    离线infotek
     
    发帖
    6243
    光币
    25360
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要  +,gI|  
    j_H{_Ug  
    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。
    7AX<>^  
    "W?k~.uw  
    背景 !LVWggk1  
    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。 i-vhX4:bd  
    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。 kVCS FF*  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    x}?y@.sn8  
    Eg FV  
     I QS|  
    步骤 f nX!wN  
    7  g8SK  
    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。 <=l!~~%  
    +^iUY%pm  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    ! ;x  
    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) wWKC.N  
    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 @kenv3[Lc  
    例如下所示: /QZnN?k  
    Sample name:  EDF-C1-56 xa[<k >r3  
    Merging data from file EDF-C1-56 0-0.txt ?Lbw o<E  
    Finished merging RPC data for sample EDF-C1-56 rbHrG<+7zO  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt I3uaEv7OZc  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s/Fc7V!;  
    a. 创建一个新的散射库 (`5No:?v<  
    b. 散射模型命名 Oz# $x  
    c. 改变散射模型为“Tabulated BSDF”. w}c1zpa  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) I,(m\NalK  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 DN2K4%cM%'  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 r :{2}nE  
    g. 点击OK 2Vxr  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 5)+(McJC  
    mT <4@RrB  
    WO?EzQ ?  
    脚本代码 ,B(UkPGT  
    f ?_YdVZ  
    '#Language "WWB-COM" (C={/waJ  
    CkE@ Ll3Z  
    Option Explicit Qw!cd-zc  
    ^>gRK*,  
    Sub Main 'S@%  
    @>,3l;\Zh  
        'Cleanup -==@7*x!Z  
        ClearOutputWindow() +Pd&YfU9  
    Q#wASd.  
        Print "Merging RPC Photonics BSDF Data Files" .Qg!_C  
        SetTextColor(255,0,0) z9}rT<hy  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ;{ u{F L  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." {9vvj  
        SetTextColor(0,0,0) <"{Lv)4  
    L MC-1  
        'Current directory of this script (should be the same as the text files being merged) R/R[r> 1)6  
        Dim cDir As String yw^t6E  
        cDir = MacroDir$ & "\" %Qgo0  
    B(w k $2  
        'Array which will be populated with the list of files to be merged kbJ/7  
        Dim fList() As String, curFile As String pN6!IxN$  
        GetFileList( cDir, fList ) -sm{Hpf_b  
    SL" ;\[uI  
        Print "" 58,_  
        Print "Files found for merging:" `e .;P  
        For Each curFile In fList M7^PWC  
            Print Chr(9) & curFile hSSF]  
        Next Ap9CQ h=!  
    GzWmXm  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. :BKY#uH~  
        Dim nameArray() As String, sampName As String XL c&7  
        nameArray = Split(fList(0)," 0-0.txt") 767xCP  
        sampName  = nameArray(0) $'btfo4H  
        Print "" "2;$?*hO#  
        Print "Sample name: " & Chr(9) & sampName b)J(0,9`G"  
    ~z#Faed=a  
        'Open an output file and write the FRED header data {\ [u2{  
        Dim outFile As String <Z{\3X^  
        outFile = cDir & sampName & "_FRED.txt" m:5*:Ii.  
        Open outFile For Output As #1 FKY|xG9  
        Print #1, "type bsdf_data" )[yM4QFl  
        Print #1, "format angles=deg bsdf=value scale=1" ?1?D[7$  
    !^cQPX2<  
        'Loop the file list, skip the two header lines and write the remaining data to file gm~Ka%O|F  
        Dim lineArray() As String, curLine As Long $J"}7+  
        For Each curFile In fList I&Q.MItW  
            Print "Merging data from file " & curFile I$xfCu  
            ReadFile( cDir & curFile, lineArray ) |(N4ZmTm  
            For curLine = 2 To UBound(lineArray) 6 DqV1'  
                Print #1, lineArray(curLine) #X'!wr|-  
            Next <\!+J\YTA  
        Next %>`0hk88  
    LL|$M;S  
        'Close the output file pqFgi_2m  
        Close #1 O&!>C7  
    T V\21  
        Print "Finished merging RPC data for sample " & sampName 5jD2%"YUV  
        Print "FRED formatted data file: " & Chr(9) & outFile J5h;~l!y  
    End Sub -'3~Y 2#  
    o#gb+[  
    'Utility function to read the contents of a file into an array of strings. r7o63]  
    Function ReadFile(ByVal fileName As String, _ 8X!^ 2B}J  
                      ByRef lineArray() As String) As Long eE5U|y)_  
    hd1(q33  
        ReadFile = -1 <iVn!P  
        Dim oFSO As Object d]6.$"\" p  
        Set oFSO = CreateObject("Scripting.FileSystemObject") \M(0@#-$C  
        Erase lineArray ++D-,>.  
    7y.$'<  
        Dim fid As Long E9TWLB5A)(  
        If oFSO.fileexists( fileName ) Then zC #[  
            fid = FreeFile() GhpVi<FL  
            Open fileName For Input As fid fBBNP)  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) W- 5Z"m1I  
            Close fid  +LeZjA[  
        End If e2CjZ"C  
        Set oFSO = Nothing 1^^<6e  
        Return UBound( lineArray ) `K37&b;`[  
    IoWh&(+KdH  
    End Function CIAHsbn.A  
    aal5d_Y  
    Sub GetFileList( ByVal in_dir As String, _ oV"#1lp*  
                     ByRef in_flist() As String ) d6,SZ*AE  
    9gR@Q%b)  
        'Redimension the file list array ZZk6 @C  
        Erase in_flist unu%\f>^4  
    MLg+ 9y  
        'Tracks how many files are found E uxD,(  
        Dim fCount As Long ,paD/  
        fCount = 0 XA75tU[#  
    vpu20?E>5z  
        'Recurse directory and search for text files ?4v&TB@  
        Dim f As String ~x;1&\'k  
        f = Dir$(in_dir & "*.txt") 3p`*'j2R  
        While f <> "" k)j, ~JH  
            ReDim Preserve in_flist(fCount) 7\I,;swo  
            in_flist(fCount) = f  %~Vgz(/  
            fCount += 1 e<o{3*%p)  
            f = Dir$() ?EQ]f34  
        Wend &U/7D!^X  
        ReDim Preserve in_flist(fCount-1) A (z lX_  
    9NXf~-V-  
    End Sub {"hX_t  
    Q${0(#Nu  
    zMlW)NB'  
    QQ:2987619807 *9.4AW~]X  
     
    分享到