切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 767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
    6374
    光币
    26015
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 ]Al;l*yw  
    {.e=qQ%P5)  
    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。
    lVH<lp_ZtK  
    w[Gh+L30=5  
    背景 or ;f&![w  
    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。 ?@6b>='!  
    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。 SJ' % ^  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    5__+_hO ;3  
    em@EDMvI  
    #:fQ.WWO  
    步骤 Vsq8H}K  
    }w-wSkl1  
    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。 G)=HB7u[a  
    -7>)i  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    fg%&N2/(.B  
    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) p 5u_1U0  
    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 kQdt}o])  
    例如下所示: V) o,1  
    Sample name:  EDF-C1-56 6&v? )o  
    Merging data from file EDF-C1-56 0-0.txt 0CvsvUN@  
    Finished merging RPC data for sample EDF-C1-56 vy@rQC %9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt v"u^M-_  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 UnWW/]E  
    a. 创建一个新的散射库 r~[vaQQ6L  
    b. 散射模型命名 $e%2t^ i.g  
    c. 改变散射模型为“Tabulated BSDF”. 1-SVCk -  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 8am`6;O:!  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 @* 1U{`  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 &FdWFt=X  
    g. 点击OK ye 6H*K  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Ru!He,k7  
     Rxpn~QQ  
    XP[uF ;w  
    脚本代码 D.!~dyI.,$  
    dHnR_.  
    '#Language "WWB-COM" PrF}a<:n:  
    6bc3 37b  
    Option Explicit UO`;&e-DB  
    wVs.Vcwr  
    Sub Main i y YJR  
    QA!_} N4n  
        'Cleanup z~6y+  
        ClearOutputWindow() 1xyU  
    |rRO@18dA  
        Print "Merging RPC Photonics BSDF Data Files" w-B^ [<  
        SetTextColor(255,0,0) \b8sG"G  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." iItcN;;7  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." =iB,["s  
        SetTextColor(0,0,0) YO)$M-]>%J  
    ".*x!l0y7  
        'Current directory of this script (should be the same as the text files being merged) V5}nOGV9  
        Dim cDir As String 7"X>?@  
        cDir = MacroDir$ & "\" ` D7C?M#j]  
    }n,Zl>T9  
        'Array which will be populated with the list of files to be merged bte~c  
        Dim fList() As String, curFile As String .@ C{3$,VG  
        GetFileList( cDir, fList ) l2%bF8]z  
    qr\ !*\9  
        Print "" 4o:hyh   
        Print "Files found for merging:" FX <b:#  
        For Each curFile In fList _GQz!YA  
            Print Chr(9) & curFile NMO-u3<6.  
        Next MjfFf} @  
    UCrh/bTm  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3q[WHwmm  
        Dim nameArray() As String, sampName As String  1iT\df  
        nameArray = Split(fList(0)," 0-0.txt") gJt`?8t  
        sampName  = nameArray(0) Bc-yxjsw  
        Print "" aMARZ)V  
        Print "Sample name: " & Chr(9) & sampName stl 1Q O(h  
    ?{"mP 'dD  
        'Open an output file and write the FRED header data _STB$cZ  
        Dim outFile As String ExSe=4q#  
        outFile = cDir & sampName & "_FRED.txt" +!-~yf#RE  
        Open outFile For Output As #1 F,Xo|jjj  
        Print #1, "type bsdf_data" \b'x t  
        Print #1, "format angles=deg bsdf=value scale=1" u D 5%E7  
    )Ag/Qep  
        'Loop the file list, skip the two header lines and write the remaining data to file 0XwHP{XaO  
        Dim lineArray() As String, curLine As Long fyz nuUl  
        For Each curFile In fList `+lHeLz':  
            Print "Merging data from file " & curFile g3@Rl2yQJ  
            ReadFile( cDir & curFile, lineArray ) a>4uiFiv  
            For curLine = 2 To UBound(lineArray) nm$Dd~mxW1  
                Print #1, lineArray(curLine) 7fp(R&)1  
            Next ln*icaDqf  
        Next x)rlyjFM  
    y< R=  
        'Close the output file hli|B+:m"  
        Close #1 q"KnLA(  
    6}~pq1IF{  
        Print "Finished merging RPC data for sample " & sampName xieP "6  
        Print "FRED formatted data file: " & Chr(9) & outFile Hs"(@eDV&J  
    End Sub $$i. O}  
    =6FUNvP#8  
    'Utility function to read the contents of a file into an array of strings. I|oT0y &  
    Function ReadFile(ByVal fileName As String, _ <HWS:'1  
                      ByRef lineArray() As String) As Long S,fCV~Cio?  
    $VG*q  
        ReadFile = -1  , iNv'  
        Dim oFSO As Object n6WY&1ZE~  
        Set oFSO = CreateObject("Scripting.FileSystemObject") wo2@hav  
        Erase lineArray )|j[uh6w o  
    U8#xgz@  
        Dim fid As Long 5/",<1  
        If oFSO.fileexists( fileName ) Then e[u?_h  
            fid = FreeFile() foF19_2 ,  
            Open fileName For Input As fid }*]B-\>  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 14eW4~Mr  
            Close fid uaw~r2  
        End If kEeo5X N  
        Set oFSO = Nothing pnyWcrBf  
        Return UBound( lineArray ) dBsX*}C  
    JG`Q;K  
    End Function lA!"z~03*  
    RT/o$$  
    Sub GetFileList( ByVal in_dir As String, _ f8 /'%$N  
                     ByRef in_flist() As String ) snM Z0W  
    aIy*pmpD=  
        'Redimension the file list array MfF~8  
        Erase in_flist [$(%dV6O  
    .%BT,$1K  
        'Tracks how many files are found -Ue$T{;RoH  
        Dim fCount As Long Z0!5d<  
        fCount = 0 2'jOP" G  
    /gcEw!JS  
        'Recurse directory and search for text files yfQ5:X  
        Dim f As String 5  *}R$  
        f = Dir$(in_dir & "*.txt") <Tw>|cFT  
        While f <> "" Kyt)2p  
            ReDim Preserve in_flist(fCount) KT|RF  
            in_flist(fCount) = f MiT}L  
            fCount += 1 vgt]:$  
            f = Dir$() c:S] R"  
        Wend ]G.%Ty  
        ReDim Preserve in_flist(fCount-1) 'k;4j|<  
    . JX EK  
    End Sub XLk<*0t p  
     
    分享到