切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1610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
    6358
    光币
    25935
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 3?c3<`TW  
    S4'   
    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。
    6eT5ktf  
    G!"YpYml  
    背景 Q~OxH'>>(  
    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/&%]"[^u  
    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。 Z1 Bp+a3  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    6%t1bM a  
    A;*d}Xe&J  
    b:Wm8pp?  
    步骤 G+%zn|  
    ]!I7Y.w6  
    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。 &^#VN%{  
    T?x[C4wf+  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    4?ICy/,U-  
    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) bL'aB{s  
    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 uW30ep'  
    例如下所示: )\eI;8  
    Sample name:  EDF-C1-56 |2RC#]/-Y  
    Merging data from file EDF-C1-56 0-0.txt luo   
    Finished merging RPC data for sample EDF-C1-56 ()5[x.xK@  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !9[>L@#G  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 -*$HddD  
    a. 创建一个新的散射库 \MbB#  
    b. 散射模型命名 <~6h|F8  
    c. 改变散射模型为“Tabulated BSDF”. LS7, a|  
    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 ) pm_`>3  
    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。 `Gn50-@  
    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 N>XS=2tzN  
    g. 点击OK g+pml*LJ  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #:[t^}  
    q=%RDG+  
    4x  
    脚本代码 g]4(g<:O  
    KVT-P};jy*  
    '#Language "WWB-COM" {@+Ty]e  
    cki81bOT  
    Option Explicit 7* yzEM  
    MRb-H1+Xf  
    Sub Main (-ufBYO6  
    X $ s:>[H  
        'Cleanup }s(N6a&(  
        ClearOutputWindow() 0w)^)  
    'eLqlu|T  
        Print "Merging RPC Photonics BSDF Data Files" ^>i63Yc  
        SetTextColor(255,0,0) U.DDaT1  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." l038%U~U!  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." `%+Wz0(K  
        SetTextColor(0,0,0) 8,C*4y~  
    RloK,bg  
        'Current directory of this script (should be the same as the text files being merged) $wo?!gt  
        Dim cDir As String $, ,op(  
        cDir = MacroDir$ & "\" 3BtaH#ZY  
    {ys=Ndo8  
        'Array which will be populated with the list of files to be merged nm6h%}xND<  
        Dim fList() As String, curFile As String d-k%{eBV  
        GetFileList( cDir, fList ) $npT[~U5  
    y%%}k  
        Print "" qU#1i:(F*  
        Print "Files found for merging:" j!U-'zJ  
        For Each curFile In fList [co% :xJu  
            Print Chr(9) & curFile U56G.  
        Next gBC@38|6)  
    KY51rw.  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. czS+< w  
        Dim nameArray() As String, sampName As String n=y[CKS  
        nameArray = Split(fList(0)," 0-0.txt") [8T^@YN  
        sampName  = nameArray(0) dwDcR,z?a  
        Print "" b:tob0TB  
        Print "Sample name: " & Chr(9) & sampName G#d{,3Gq1  
    umt.Um.m2  
        'Open an output file and write the FRED header data 1Cv-  
        Dim outFile As String b[o"7^H  
        outFile = cDir & sampName & "_FRED.txt" ;<j0f~G`  
        Open outFile For Output As #1 `HZ;NRr  
        Print #1, "type bsdf_data" KG|n  
        Print #1, "format angles=deg bsdf=value scale=1" LUM@#3&  
    P:k>aHnW  
        'Loop the file list, skip the two header lines and write the remaining data to file PIdikA  
        Dim lineArray() As String, curLine As Long Hn5|B 3vN  
        For Each curFile In fList `f*Q$Ulqx  
            Print "Merging data from file " & curFile ^j31S*f&:  
            ReadFile( cDir & curFile, lineArray ) YoBPLS`K  
            For curLine = 2 To UBound(lineArray) $W!!wN=B  
                Print #1, lineArray(curLine) 6L"%e!be6  
            Next eHn7iuS8  
        Next SqEgn}m$  
    +@p% p  
        'Close the output file + HK8jCa  
        Close #1 ]G5 w6&d  
    -* WXMzr  
        Print "Finished merging RPC data for sample " & sampName &jslyQ#  
        Print "FRED formatted data file: " & Chr(9) & outFile }BZ"S-hZ  
    End Sub Ji>o!  
    nxWY7hU  
    'Utility function to read the contents of a file into an array of strings. BD_Iz A<wK  
    Function ReadFile(ByVal fileName As String, _ mlJ!:WG  
                      ByRef lineArray() As String) As Long ^c^#dpn  
    BJM.iXU)[  
        ReadFile = -1 eYN5;bx)W  
        Dim oFSO As Object PIu1+k.r?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") i rU 6D  
        Erase lineArray q7_ m&-0)  
    a yCY~=i  
        Dim fid As Long WST8SEzJ  
        If oFSO.fileexists( fileName ) Then lI*o@wQg  
            fid = FreeFile() [5G6VNh=  
            Open fileName For Input As fid `$,GzS(  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Xejo_SV&?  
            Close fid oSy yd  
        End If 1FlX'[vh  
        Set oFSO = Nothing 8ZM&(Lz7u  
        Return UBound( lineArray ) pEBM3r!X  
    E"qRw_ ~t  
    End Function FbS|~Rp~  
    OB Otuu.  
    Sub GetFileList( ByVal in_dir As String, _ 9N@W\DT  
                     ByRef in_flist() As String ) Q=AavKn#  
    Cs9.&Y  
        'Redimension the file list array W+UfGk}A  
        Erase in_flist i BF|&h(\  
    9 Vkb>yFX'  
        'Tracks how many files are found #gz M|  
        Dim fCount As Long n>ULRgiT:o  
        fCount = 0 o]yl ;I  
    F Sw\_[^CQ  
        'Recurse directory and search for text files l_o@miG/  
        Dim f As String B8f8w)m  
        f = Dir$(in_dir & "*.txt") Qw-~>d  
        While f <> "" #$18*?tLv|  
            ReDim Preserve in_flist(fCount) 7 n8"/0kc:  
            in_flist(fCount) = f 1_9<3,7  
            fCount += 1 }&cu/o4  
            f = Dir$() 41`n1:-]  
        Wend =/s>Q l  
        ReDim Preserve in_flist(fCount-1) a1C{(f)  
    X:HacYqtC  
    End Sub ?[@J8  
    W42 iu"@  
    B"h#C!E  
    QQ:2987619807 NQBpX  
     
    分享到