切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1015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
    6441
    光币
    26350
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 3cfZ!E~^kc  
    nUud?F^_  
    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。
    K;y\[2;}e,  
    2x`xyR_Q.R  
    背景 Wqs.oh  
    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。 0Dm`Ek3A7x  
    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。 c+b:K  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    H]i+o6  
    ;/";d]j  
    =!S@tuY  
    步骤 F*4Qa  
    ;;y@z[ >  
    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。 _N,KHxsG8B  
    GATP  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    4-M6C 5#.  
    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) VJl &Bq+  
    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 bm tJU3Rm  
    例如下所示: -wtTq ph'  
    Sample name:  EDF-C1-56 &FJU%tFA  
    Merging data from file EDF-C1-56 0-0.txt +A'q#~yILa  
    Finished merging RPC data for sample EDF-C1-56 3\p]esse  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt HV*:<2P%D  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 F`;TU"pDf  
    a. 创建一个新的散射库 K^,&ub.L)  
    b. 散射模型命名 U| 41u4)D  
    c. 改变散射模型为“Tabulated BSDF”. XgiI6-B~  
    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 ) MOp=9d+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。 KtfkE\KP  
    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 !8  wid&  
    g. 点击OK z6FbM^;;  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |%:q hs,  
    S& ,Ju%  
    tv@Z 5  
    脚本代码 np`g cj#  
    2pxWv )0  
    '#Language "WWB-COM" s=q%:uCO  
    p-T~x$"c|  
    Option Explicit ~4=]%XYz  
    _cxm}*}\#  
    Sub Main g/U$!d_  
    Lem\UD$D`  
        'Cleanup ,);= (r9  
        ClearOutputWindow() K'iS#i7  
    + +T "+p  
        Print "Merging RPC Photonics BSDF Data Files" S<y>Y  
        SetTextColor(255,0,0) d739UhKC  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." qXP1Q3  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." w| -0@  
        SetTextColor(0,0,0) EaM"=g  
    k Z+q  
        'Current directory of this script (should be the same as the text files being merged) 6:|!1Pg5  
        Dim cDir As String P EX26==  
        cDir = MacroDir$ & "\" E !Oz|q  
    nxn[ ~~  
        'Array which will be populated with the list of files to be merged 1kvPiV=X>  
        Dim fList() As String, curFile As String 3P+4S|@q(4  
        GetFileList( cDir, fList ) 'uP'P#  
    Ad}-I%Ie  
        Print "" `zElBD  
        Print "Files found for merging:" OQytgXED  
        For Each curFile In fList =RW* %8C  
            Print Chr(9) & curFile wc6 E- rB  
        Next 7~!I2DV_  
    zx\.2<K  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6o[0sM_];  
        Dim nameArray() As String, sampName As String o ;[C(OS  
        nameArray = Split(fList(0)," 0-0.txt") vCy.CN$  
        sampName  = nameArray(0) \yJZvhUk  
        Print "" u|_LR5S!j  
        Print "Sample name: " & Chr(9) & sampName "fX_gN?  
    "xe7Dl  
        'Open an output file and write the FRED header data dJdD"xj  
        Dim outFile As String ]97Xu_  
        outFile = cDir & sampName & "_FRED.txt" 26\HV  
        Open outFile For Output As #1 wo7N7R5  
        Print #1, "type bsdf_data" %gV)arwK  
        Print #1, "format angles=deg bsdf=value scale=1" RJtix uvh@  
    Z #.GI  
        'Loop the file list, skip the two header lines and write the remaining data to file ql!5m\  
        Dim lineArray() As String, curLine As Long #6*V7@9]3|  
        For Each curFile In fList Z-4K?;g'k  
            Print "Merging data from file " & curFile -vv   
            ReadFile( cDir & curFile, lineArray ) * ajFZI  
            For curLine = 2 To UBound(lineArray) [ E$$nNs  
                Print #1, lineArray(curLine) ^Ei*M0fF  
            Next `7u\   
        Next S KB@  
    th.M.jas  
        'Close the output file i>ESEmb-  
        Close #1 cOzg/~\1  
    !pd7@FwC  
        Print "Finished merging RPC data for sample " & sampName +L`V[;  
        Print "FRED formatted data file: " & Chr(9) & outFile SjZd0H0  
    End Sub kN'|,eKH4  
    B]'e$uyL7  
    'Utility function to read the contents of a file into an array of strings. M,b<B_$  
    Function ReadFile(ByVal fileName As String, _ E0sbU<11  
                      ByRef lineArray() As String) As Long K%Usjezv&  
    Mq+viU&   
        ReadFile = -1 tpv?`(DDU  
        Dim oFSO As Object > [Xm|A#  
        Set oFSO = CreateObject("Scripting.FileSystemObject") P\D[n-&  
        Erase lineArray pd=7^"[};  
    ggrI>vaw  
        Dim fid As Long /-DKV~  
        If oFSO.fileexists( fileName ) Then N+*(Y5TU  
            fid = FreeFile() #Y;.>mF  
            Open fileName For Input As fid ,DE(5iDS  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9|J8]m?x  
            Close fid  K&j' c  
        End If ,$HHaoo g  
        Set oFSO = Nothing y\[L?Rmd  
        Return UBound( lineArray ) vg+r?4Q3  
    PLO\L W  
    End Function l0gH(28K  
    =L:[cIRrT;  
    Sub GetFileList( ByVal in_dir As String, _ |C~Sr#6)7  
                     ByRef in_flist() As String ) &(lMm)  
    @)  
        'Redimension the file list array ~&lQNl3`m6  
        Erase in_flist z VnIr<!8_  
    ?2H{^\<(e  
        'Tracks how many files are found 6o$Z0mG  
        Dim fCount As Long Zk wJ.SuU  
        fCount = 0 91BY]N  
    "\NF  
        'Recurse directory and search for text files Xyb8u})p'  
        Dim f As String j1'\R+4U  
        f = Dir$(in_dir & "*.txt") 8r5xs-  
        While f <> "" CKJAZ2  
            ReDim Preserve in_flist(fCount) g<M0|eX@~  
            in_flist(fCount) = f #N; $  
            fCount += 1 %rFP#L  
            f = Dir$() S*;#'j)4+  
        Wend fW(;   
        ReDim Preserve in_flist(fCount-1) Tsu\oJ[  
    CP}0Ri)  
    End Sub DKR<W.!*t  
     
    分享到