切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 874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
    在线infotek
     
    发帖
    6409
    光币
    26190
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 '4~I %Z7L  
    *x p_#  
    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。
    Qu8=zI>t  
    ~Cynw(  
    背景 *tR'K#:&g!  
    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。 c0&! S-4M  
    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。 N;!!*3a9=  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    0/7.RpX,.  
    OuWRLcJ!  
    !lsa5w{  
    步骤 |90/tNe  
    +`B^D  
    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。 &><b/,]  
    RK$(  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    ph!h8@e  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) c3PA<q[  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 y[S9b (:+  
    例如下所示: ^AOJ^@H^>  
    Sample name:  EDF-C1-56 MMD=4;X  
    Merging data from file EDF-C1-56 0-0.txt D88IU9V&n  
    Finished merging RPC data for sample EDF-C1-56 i=P}i8,^ =  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;Kg7}4`I  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 3tkCmB  
    a. 创建一个新的散射库 (./Iq#@S  
    b. 散射模型命名 pSYEC,0B  
    c. 改变散射模型为“Tabulated BSDF”. P (Y\l  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) s+&0Z3+  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Vl<7>  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 JdWav!PYm  
    g. 点击OK eHd7fhW5  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 pbWjTI$  
    ZIh)D[n  
    UFj!7gX]  
    脚本代码 ]\}MSo3  
    /Q:mUd  
    '#Language "WWB-COM" Vr %ef:uVV  
    Y!Io @{f  
    Option Explicit "}-S%v`)z  
    QJjk#*?,|  
    Sub Main @*=5a (#  
    4HGS  
        'Cleanup ^7;s4q  
        ClearOutputWindow() -m ;n}ECg  
    # M!1W5#  
        Print "Merging RPC Photonics BSDF Data Files" o Qo5y_o~  
        SetTextColor(255,0,0) 44YKS>Cq  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." `YMd0*  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." uNw9g<g:V[  
        SetTextColor(0,0,0) +.|RH  
    m"'`$/_  
        'Current directory of this script (should be the same as the text files being merged) `(I$_RSE")  
        Dim cDir As String Y"m(hs $  
        cDir = MacroDir$ & "\" x_C0=Q|K3  
    )24M?R@r  
        'Array which will be populated with the list of files to be merged F>X<=YO0  
        Dim fList() As String, curFile As String p:0X3?IG3  
        GetFileList( cDir, fList ) WA:r4V  
    DrxQ(yo}  
        Print "" M1*bT@ 6  
        Print "Files found for merging:" [/n@BK  
        For Each curFile In fList M#m;jJqON  
            Print Chr(9) & curFile )1 HWD]>4  
        Next L*vKIP<EMM  
    _F|}=^Z`  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. `c-omNu  
        Dim nameArray() As String, sampName As String n"Bc2}{  
        nameArray = Split(fList(0)," 0-0.txt") ]bpgsW:Xu  
        sampName  = nameArray(0) Q[|*P ] w  
        Print "" HTvUt*U1  
        Print "Sample name: " & Chr(9) & sampName +PKsiUJ|  
    m&'!^{av  
        'Open an output file and write the FRED header data 1Ax;|.KQH  
        Dim outFile As String $7i[7S4  
        outFile = cDir & sampName & "_FRED.txt" /m 7~-~$V  
        Open outFile For Output As #1 be5N{lPT@;  
        Print #1, "type bsdf_data" Vry_X2  
        Print #1, "format angles=deg bsdf=value scale=1" ;_E|I=%'E  
    e6jA4X+a  
        'Loop the file list, skip the two header lines and write the remaining data to file 6CW5ay_,  
        Dim lineArray() As String, curLine As Long ~vM99hW  
        For Each curFile In fList d~{$,"!-f  
            Print "Merging data from file " & curFile urCTP.F  
            ReadFile( cDir & curFile, lineArray ) zEukEA^9`  
            For curLine = 2 To UBound(lineArray) MOnTp8   
                Print #1, lineArray(curLine) K' <[kh:cl  
            Next ]6Awd A  
        Next ',LC!^:~Nw  
    Dh?I   
        'Close the output file K4YD}[  
        Close #1 W7!iYxO  
    W-/V5=?   
        Print "Finished merging RPC data for sample " & sampName R:R<Xt N`5  
        Print "FRED formatted data file: " & Chr(9) & outFile d)acWF\  
    End Sub pIYXYQ=Z  
    V'MY+#  
    'Utility function to read the contents of a file into an array of strings. %2g<zdab  
    Function ReadFile(ByVal fileName As String, _ ;z N1Qb  
                      ByRef lineArray() As String) As Long }^p<Y5{b  
    H6|eUU[&  
        ReadFile = -1 x-%RRm<V  
        Dim oFSO As Object VY+P c/b  
        Set oFSO = CreateObject("Scripting.FileSystemObject") d%-/U!z?  
        Erase lineArray w-LENdw  
    Ot:}Ncq^\O  
        Dim fid As Long SPt/$uYJ  
        If oFSO.fileexists( fileName ) Then  P Je_qP  
            fid = FreeFile() e3~{l~ Rb  
            Open fileName For Input As fid 32%Fdz1S  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2l^_OrE!  
            Close fid G'PZ=+!XO/  
        End If &vn2u bauS  
        Set oFSO = Nothing ~ A=Gra  
        Return UBound( lineArray ) pi/0~ke4"  
    G :k'm^k  
    End Function 1;V_E2?V  
    " r o'?  
    Sub GetFileList( ByVal in_dir As String, _ QHf&Z*Xtl  
                     ByRef in_flist() As String ) >][D"  
    v:yU+s|kN  
        'Redimension the file list array 0`-b57lF&  
        Erase in_flist ih^FH>@  
    ,$> l[G;Bm  
        'Tracks how many files are found Vd  d  
        Dim fCount As Long W ulyM cJ  
        fCount = 0 s*<T'0&w0S  
    9q_{_%G%  
        'Recurse directory and search for text files q` IY;"~  
        Dim f As String qIsf!1I?  
        f = Dir$(in_dir & "*.txt") cy;i1#1rO  
        While f <> "" gBcs  
            ReDim Preserve in_flist(fCount) O#=%t  
            in_flist(fCount) = f [WG\w j.  
            fCount += 1 3]mprX'  
            f = Dir$() {5<fvMO!6  
        Wend :-JryiI  
        ReDim Preserve in_flist(fCount-1) LR>s2zu-  
    p^RX<L/\=_  
    End Sub h@G~' \8t  
     
    分享到