切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1613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
    6374
    光币
    26015
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 ar__ Pf6r  
    oB}BU`-l  
    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。
    <0b)YJb4M  
    Y$Z x,  
    背景 ,?>s>bHV  
    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。 8K:y\1  
    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。 * @ 3Ag(  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    j[`j9mM8  
    7gf05Z'=  
    %zG;Q@  
    步骤 TE3lK(f  
    9s\A\$("l  
    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。 ]^h]t~  
    0z1ifg&  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    [pbo4e,4O  
    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) [<n2Uz7MP  
    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 $xzAv{  
    例如下所示: ]Lf{Jboo  
    Sample name:  EDF-C1-56 8aK)#tNWN  
    Merging data from file EDF-C1-56 0-0.txt yA)/Q Yge  
    Finished merging RPC data for sample EDF-C1-56 ZP@ $Q%up  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &dqLP9 5  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 EMY/~bQW  
    a. 创建一个新的散射库 (SpX w,:  
    b. 散射模型命名 z* ^_)Z  
    c. 改变散射模型为“Tabulated BSDF”. R%{<mno/_  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ~xkeuU  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 l3Xfc2~ 2  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 cqQ#p2<%  
    g. 点击OK ZGexdc%  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 HVi'eNgo  
    ??^5;P{yx  
    MqW7cjg  
    脚本代码 |:nn>E}ZA/  
    smlpD3?va  
    '#Language "WWB-COM" gH12[Us'`  
    q ?|,O;?  
    Option Explicit YWe{juXSw  
    *Fy2BZH%Q  
    Sub Main -.1y(k^4E  
    e|)hG8FlF  
        'Cleanup `F-/QX[:  
        ClearOutputWindow() J?V?R  
    i6^twK)j  
        Print "Merging RPC Photonics BSDF Data Files" v[ . cd*b  
        SetTextColor(255,0,0) h{%nC>m;  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." /KFfU1  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." nEJq_  
        SetTextColor(0,0,0) V3&RJ k=b  
    [)H&'5 +F  
        'Current directory of this script (should be the same as the text files being merged) k Z?=AXu  
        Dim cDir As String &TUWW/?T  
        cDir = MacroDir$ & "\" NSxoF3  
    !\-{D$E?H  
        'Array which will be populated with the list of files to be merged `.E[}W  
        Dim fList() As String, curFile As String HJ9Kz^TnC  
        GetFileList( cDir, fList ) *w|:~g  
    d(\%Os   
        Print "" Z/W:97M  
        Print "Files found for merging:" HHA<IZ#;,  
        For Each curFile In fList o)h_H;  
            Print Chr(9) & curFile C uFSeRe  
        Next {&cJDqz5=  
    =b%MXT  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Yrb{ByO&  
        Dim nameArray() As String, sampName As String  DGRXd#  
        nameArray = Split(fList(0)," 0-0.txt") *QpMF/<?  
        sampName  = nameArray(0) b,5~b&<h  
        Print "" y`VyQWW  
        Print "Sample name: " & Chr(9) & sampName vq0Vq(V=  
    bfFeBBi  
        'Open an output file and write the FRED header data R_ B7EP  
        Dim outFile As String T5R-B=YWu  
        outFile = cDir & sampName & "_FRED.txt" *F+KqZ.2  
        Open outFile For Output As #1 -f3p U:G8  
        Print #1, "type bsdf_data" XeW<B0~  
        Print #1, "format angles=deg bsdf=value scale=1" Tl%`P_J)-S  
    ^ UciW  
        'Loop the file list, skip the two header lines and write the remaining data to file IshKH -  
        Dim lineArray() As String, curLine As Long ,$@bE  
        For Each curFile In fList E-4b[xNj*+  
            Print "Merging data from file " & curFile i5en*)O8  
            ReadFile( cDir & curFile, lineArray ) @D.}\(  
            For curLine = 2 To UBound(lineArray) Sxnpq Vbk  
                Print #1, lineArray(curLine) xR-%L  
            Next cA2V2S)  
        Next n D0K).=Q  
    ?8I?'\F;  
        'Close the output file o\[~.";Z  
        Close #1 aAZZ8V  
    cm&nd'A't  
        Print "Finished merging RPC data for sample " & sampName  '<jyw   
        Print "FRED formatted data file: " & Chr(9) & outFile ;%B(_c  
    End Sub cbNTj$'b2u  
    -c_74c50  
    'Utility function to read the contents of a file into an array of strings. Umz KY  
    Function ReadFile(ByVal fileName As String, _ AV:h BoO  
                      ByRef lineArray() As String) As Long {}>0e:51  
    DjCqh-&L  
        ReadFile = -1 i/65v  
        Dim oFSO As Object D|lzGt  
        Set oFSO = CreateObject("Scripting.FileSystemObject") j:^#rFD4?  
        Erase lineArray s28`OKC}  
    ?274uAO'  
        Dim fid As Long +dWDxguE{w  
        If oFSO.fileexists( fileName ) Then &Q%zl9g(g  
            fid = FreeFile() BTl k Etm  
            Open fileName For Input As fid F<ZYh  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) c%^7!FSg  
            Close fid |Z|-q"Rf  
        End If hP=WFD&  
        Set oFSO = Nothing I.WvLLK2  
        Return UBound( lineArray ) /vY(o1o x  
    5Iy|BRU(%  
    End Function aB*Bz]5;E  
    }HL]yDO  
    Sub GetFileList( ByVal in_dir As String, _ m-%E-nr  
                     ByRef in_flist() As String ) <>n0arAn  
    aFc1|.Nm  
        'Redimension the file list array 6 +Sxr  
        Erase in_flist mH54ja2  
    QEm|])V  
        'Tracks how many files are found N@;?CKU  
        Dim fCount As Long \n"{qfn`r  
        fCount = 0 y>R=`A1b  
    u~r=)His  
        'Recurse directory and search for text files pe0F0Ruy  
        Dim f As String HpR]q05d  
        f = Dir$(in_dir & "*.txt") ;5wn67'  
        While f <> "" f"B3,6m  
            ReDim Preserve in_flist(fCount) R]Vt Y7}i,  
            in_flist(fCount) = f W KQ^NEqr3  
            fCount += 1 cec9l65d  
            f = Dir$() yID 164&r  
        Wend Zvhsyz|  
        ReDim Preserve in_flist(fCount-1) tN[L@t9#cr  
    "C?#SO B  
    End Sub !*/*8re  
    Xk:OL,c  
    kHk px52  
    QQ:2987619807  |$+3a  
     
    分享到