切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1814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
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 rahHJp.Ws  
    @p9e:[  
    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。
    EOd.Tyb!/  
    ];d5X  
    背景 orcZ yYU  
    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。 SK2J`*  
    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。 ?{ 8sT-Z-L  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    'O\d<F.c$2  
    #z-iL!?  
    r{Qs9  
    步骤 W<cW;mO  
    ~PU1vbv9T  
    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。 9TbS>o  
    q/d5P  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    dy8In%  
    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"!DaAf  
    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 |p=.Gg=2  
    例如下所示: B $ y44  
    Sample name:  EDF-C1-56 rw=UK`  
    Merging data from file EDF-C1-56 0-0.txt E7Gi6w~\  
    Finished merging RPC data for sample EDF-C1-56 Nj3^"}V  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt s= GOB"G  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 "c! oOaA  
    a. 创建一个新的散射库 &<fRej]v  
    b. 散射模型命名 1 o  
    c. 改变散射模型为“Tabulated BSDF”. (DEL xE  
    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 ) M'>D[5;N~  
    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。 ]P}K3tN%]  
    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 @gu77^='  
    g. 点击OK Im' :sJ31  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Yt O@n@1  
    +,{Wcb  
    ()3x%3   
    脚本代码 CL<KBmW7  
    >2/wzsW  
    '#Language "WWB-COM" Nak'g/uP>  
    ?-.Ep0/  
    Option Explicit cciAMQhA  
    +qSr=Y:+  
    Sub Main o?Tp=Ge  
    0]2B-o"kI  
        'Cleanup NZ%~n:/V#  
        ClearOutputWindow() upEPv .h  
    D"( 3VIglq  
        Print "Merging RPC Photonics BSDF Data Files" K#6`LL m  
        SetTextColor(255,0,0) tsSS31cv  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." hI>rtaY_  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." )kY _"= d  
        SetTextColor(0,0,0) Fl'xmz^  
     z7.C\l  
        'Current directory of this script (should be the same as the text files being merged) Q 2SSJ  
        Dim cDir As String _'v }=:X  
        cDir = MacroDir$ & "\" Y+"hu2aPkY  
    asmW W8lz  
        'Array which will be populated with the list of files to be merged "6*Kgf2G  
        Dim fList() As String, curFile As String %9 -#`  
        GetFileList( cDir, fList ) Vf,~MG  
    beHCEwh  
        Print "" 4f*Ua`E_  
        Print "Files found for merging:" Y9co?!J 5M  
        For Each curFile In fList RwE*0 T  
            Print Chr(9) & curFile \dxW44sM  
        Next sKB-7  
    +v[$lh+  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \Q?|gfJH  
        Dim nameArray() As String, sampName As String [nPzh Xs  
        nameArray = Split(fList(0)," 0-0.txt") +'&_V011<  
        sampName  = nameArray(0) +O!M>  
        Print "" fFTvf0j  
        Print "Sample name: " & Chr(9) & sampName sh)) [V"8  
    @#ho(_U8  
        'Open an output file and write the FRED header data }^ Ua  
        Dim outFile As String Z\gg<Q  
        outFile = cDir & sampName & "_FRED.txt" @|UIV  
        Open outFile For Output As #1 Q3'B$,3O^  
        Print #1, "type bsdf_data" _]~ht H  
        Print #1, "format angles=deg bsdf=value scale=1" { d2f)ra.  
    b\|p  
        'Loop the file list, skip the two header lines and write the remaining data to file |<Dx  
        Dim lineArray() As String, curLine As Long U0bE B  
        For Each curFile In fList ,w/mk$v  
            Print "Merging data from file " & curFile hC 4X Y  
            ReadFile( cDir & curFile, lineArray ) j+B5m:ExfI  
            For curLine = 2 To UBound(lineArray) O]%m{afM  
                Print #1, lineArray(curLine) t1{%FJ0F  
            Next 8.3_Wb(c  
        Next )Fr;'JYC1S  
    A7,$y!D  
        'Close the output file `@.s!L(V  
        Close #1 *ZSp9g"Z  
    C=_-p"O#  
        Print "Finished merging RPC data for sample " & sampName sr($Bw  
        Print "FRED formatted data file: " & Chr(9) & outFile w KMk|y>  
    End Sub =!P?/  
    D15u1A  
    'Utility function to read the contents of a file into an array of strings. =wR]X*Pan  
    Function ReadFile(ByVal fileName As String, _ kcz#8K]~  
                      ByRef lineArray() As String) As Long =UKR<@QrK  
    $Ex 9  
        ReadFile = -1 RWPd S  
        Dim oFSO As Object dV=5_wXZ$  
        Set oFSO = CreateObject("Scripting.FileSystemObject") -S3+ h$Y8  
        Erase lineArray <%#y^_  
    |e[0Qo@  
        Dim fid As Long *=0r>]  
        If oFSO.fileexists( fileName ) Then #M9D" <pn}  
            fid = FreeFile() dVG UhXN6  
            Open fileName For Input As fid v0MOX>`s  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  T[[  
            Close fid .rB;zA;4S)  
        End If P$qkb|D,  
        Set oFSO = Nothing Qu>zO!x  
        Return UBound( lineArray ) &eS70hq  
    *_K-T#  
    End Function &@iF!D\u  
    = SJF \Z  
    Sub GetFileList( ByVal in_dir As String, _ "oXAIfU#T  
                     ByRef in_flist() As String ) H|:)K^o  
    Jx>B %vZ\  
        'Redimension the file list array "PScM9)\  
        Erase in_flist m#K%dR  
    l5OV!<7~X  
        'Tracks how many files are found dQ|Ht[ s=  
        Dim fCount As Long hSKH#NS  
        fCount = 0 hYv 6-5_  
    tP(bRQ>  
        'Recurse directory and search for text files Fx:en|g  
        Dim f As String p}zk&`  
        f = Dir$(in_dir & "*.txt") m"7R 4O  
        While f <> "" YB1DL ^ :  
            ReDim Preserve in_flist(fCount) t\bxd`,  
            in_flist(fCount) = f s]8J+8 <uO  
            fCount += 1 rJQ|Oi&1i  
            f = Dir$() ^W[`##,{Od  
        Wend [,$mpJCI  
        ReDim Preserve in_flist(fCount-1) 7Z~szD  
    GhQ`{iJM  
    End Sub g+r{>x  
    u2O^3r G-  
    $#JVI:  
    QQ:2987619807 ` "":   
     
    分享到