切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 646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
    5937
    光币
    23838
    光券
    0
    只看楼主 正序阅读 楼主  发表于: 2023-05-11
    摘要 Z #w1,n88  
    ZA1?'  
    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。
    G&/}P$  
    m3F.-KPO  
    背景 5EFow-AH  
    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。 "o<:[c9/  
    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。 UmiW_JB  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    OrPIvP<w@  
    JI3AR e?y  
    %Q1v8l.}  
    步骤  42Gr0+Mb  
    v_{`O'#j^  
    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。 , *e^,|#  
    xPQO}wKa  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    #n{wK+lz  
    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) vFL3eu#  
    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 }s}b]v  
    例如下所示: 2i |wQU5w  
    Sample name:  EDF-C1-56 /A_</GYs  
    Merging data from file EDF-C1-56 0-0.txt /'TzHO9_`  
    Finished merging RPC data for sample EDF-C1-56 fS1N(RZ 1  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (66X  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s:*gjoL  
    a. 创建一个新的散射库 #8;^ys1f  
    b. 散射模型命名 _f|Au`7m  
    c. 改变散射模型为“Tabulated BSDF”. xb8fV*RO8A  
    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 ) O5Yk=-_m  
    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。 EVgn^,  
    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 "!p#8jR^  
    g. 点击OK ?Sn$AS I  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 duXv [1  
    6\4oHRJC  
    kzJNdYtdH  
    脚本代码 M`BD]{tN}  
    0m7J'gm{  
    '#Language "WWB-COM"  t Z\  
    BxG0vJN|  
    Option Explicit D G7FG--  
    *: e^yi  
    Sub Main }= s@y"["  
    C([;JO 11[  
        'Cleanup .X_k[l9  
        ClearOutputWindow() 3c@Cb`w@  
    D*vrQ9&# 8  
        Print "Merging RPC Photonics BSDF Data Files" HY5g>wv@  
        SetTextColor(255,0,0) Vfg144FG'  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Y&Pi`E9=  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." )uwpeq$j7l  
        SetTextColor(0,0,0) YOGw Q  
    +wD--24!(  
        'Current directory of this script (should be the same as the text files being merged) \ts:'  
        Dim cDir As String K JPB-  
        cDir = MacroDir$ & "\" J:#B,2F+^  
    % eW>IN]5  
        'Array which will be populated with the list of files to be merged #OJ^[Zi<  
        Dim fList() As String, curFile As String vq(@B  
        GetFileList( cDir, fList ) LNXhzW   
    vB/MnEKR  
        Print "" KSh<_`j  
        Print "Files found for merging:" >I]t |RT])  
        For Each curFile In fList ^uIZs}=+  
            Print Chr(9) & curFile rm2{PV<+d  
        Next aODOc J N  
    U+~0m!|4  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .Ks&r  
        Dim nameArray() As String, sampName As String :'1ePq  
        nameArray = Split(fList(0)," 0-0.txt") W zy8  
        sampName  = nameArray(0) *ubLuC+b  
        Print "" wd..{j0&  
        Print "Sample name: " & Chr(9) & sampName ln9MVF'!&  
    .H7"nt^  
        'Open an output file and write the FRED header data [5a`$yaQ  
        Dim outFile As String [K&O]s<Y  
        outFile = cDir & sampName & "_FRED.txt" hkHMBsNi  
        Open outFile For Output As #1 cU%#oEMf<  
        Print #1, "type bsdf_data" h!yF   
        Print #1, "format angles=deg bsdf=value scale=1" (yc$W9  
    2NIK0%6  
        'Loop the file list, skip the two header lines and write the remaining data to file ,dzbI{@6  
        Dim lineArray() As String, curLine As Long r6Pi ZgR  
        For Each curFile In fList ~u,g5  
            Print "Merging data from file " & curFile 'PV,c|f>  
            ReadFile( cDir & curFile, lineArray ) {< jLfL1  
            For curLine = 2 To UBound(lineArray) ]~3wq[O  
                Print #1, lineArray(curLine) S U2`H7C*  
            Next ;Jv)J3y  
        Next ;\4}Hcg  
    CM9+h;Zm  
        'Close the output file )c]GgPH  
        Close #1 >@ h0@N  
    Gxm+5q  
        Print "Finished merging RPC data for sample " & sampName 8{%/!ylJz  
        Print "FRED formatted data file: " & Chr(9) & outFile t8]u#bx"?  
    End Sub fm&l 0  
    HmbTV(lC  
    'Utility function to read the contents of a file into an array of strings. dL6sb;7R  
    Function ReadFile(ByVal fileName As String, _ <mrLld#_:C  
                      ByRef lineArray() As String) As Long qLA  
    s:I^AL5  
        ReadFile = -1 t~sW]<qjp  
        Dim oFSO As Object ( 5_oH  
        Set oFSO = CreateObject("Scripting.FileSystemObject") lS XhHy  
        Erase lineArray CEqfsKrsxE  
    ou,W|<%  
        Dim fid As Long d@,q6R}!MP  
        If oFSO.fileexists( fileName ) Then aH'^`]'_=  
            fid = FreeFile() EU>@k{Qt  
            Open fileName For Input As fid ~NU~jmT2  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ax>en]rNP  
            Close fid >[ lj8n  
        End If ,_\h)R_  
        Set oFSO = Nothing Dih~5  
        Return UBound( lineArray ) `1M_rG1/+  
    R;I}#b cJ  
    End Function ^h^j:!76j  
    |])%yRAGQ  
    Sub GetFileList( ByVal in_dir As String, _ z_A%>E4  
                     ByRef in_flist() As String ) 4.H!rkMM  
    OjrQ[`(E  
        'Redimension the file list array cf0em!  
        Erase in_flist Z#7HuAF{]  
    7F}I.,<W  
        'Tracks how many files are found 7@+0E 2'  
        Dim fCount As Long ?em)om  
        fCount = 0 Z U f<s?  
    Nm OQ7T  
        'Recurse directory and search for text files +/x|P-  
        Dim f As String [m}x  
        f = Dir$(in_dir & "*.txt") IQ2<Pinv  
        While f <> "" F^`sIrZvs  
            ReDim Preserve in_flist(fCount) .!)7x3|$[  
            in_flist(fCount) = f yU .B(|  
            fCount += 1 d=lZhqY  
            f = Dir$() Z;WqKIM#  
        Wend 1(On.Y=   
        ReDim Preserve in_flist(fCount-1) A4(^I u  
    P 3lN ns3  
    End Sub 2eyvY|:Q>  
     
    分享到