切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 795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
    在线infotek
     
    发帖
    6385
    光币
    26070
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 Fi(_A  
    F]SexP4:A  
    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。
    Y.jg }oV  
    <@5#  
    背景 Q|+m)A4@  
    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。 Alh%Z\  
    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。 w.J2pvyB  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    ?$F:S%eH  
    S1%{/w  
    "YHe]R>3s  
    步骤 -4Y}Y5 9\  
    ma?569Z8~0  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 OFCkQEG=y>  
    R7Hn8;..  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    <k}>eGn  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 3"!2C,3c#  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 XQ,I Ej|  
    例如下所示: 5K{(V^88F  
    Sample name:  EDF-C1-56 az0( 54M  
    Merging data from file EDF-C1-56 0-0.txt "uqa~R{  
    Finished merging RPC data for sample EDF-C1-56 kn`KU.J.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +JBhw4et;.  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 w0tlF:Eg  
    a. 创建一个新的散射库 Yy>%dL  
    b. 散射模型命名 z15(8Y@2]  
    c. 改变散射模型为“Tabulated BSDF”. : bT*cgD{  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 0xIr:aFF  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ;Z C18@  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 BxO2w1G  
    g. 点击OK >Mrz$ z{x  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 XC0G5rtB  
    -5kq9Dy\,  
    dg/7?gV  
    脚本代码 %w6> 3#e  
    (= uwx#  
    '#Language "WWB-COM" 6DR@$fpt  
    H*EQ%BLW^,  
    Option Explicit t*e+[  
    9BNAj-Xa  
    Sub Main RAXqRP,iw  
    mcS/-DaN?  
        'Cleanup B;hc|v{(  
        ClearOutputWindow() zO9|s}J8q  
    f1hi\p0q  
        Print "Merging RPC Photonics BSDF Data Files" +J_A *B  
        SetTextColor(255,0,0) 1\kOjF)l  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." zZki9P   
        Print "Note: Do not run this script multiple times without deleting the output file between executions." u%VO'}Gz  
        SetTextColor(0,0,0) RZm5[n  
    =@gH$Q_1  
        'Current directory of this script (should be the same as the text files being merged) p^ 9QYR  
        Dim cDir As String %49@  
        cDir = MacroDir$ & "\" 8X5;)h   
    (3{'GX2c  
        'Array which will be populated with the list of files to be merged +lO Y IQ  
        Dim fList() As String, curFile As String >:Xzv  
        GetFileList( cDir, fList ) d7$H})[^  
     .;iXe  
        Print "" I)_072^O  
        Print "Files found for merging:" RyIr_:&-~  
        For Each curFile In fList &Vvy`JE  
            Print Chr(9) & curFile Xdq2.:\  
        Next b (;"p-^  
    m*CIbkDsZ  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. L1P]T4a@)  
        Dim nameArray() As String, sampName As String .y+>-[j?B  
        nameArray = Split(fList(0)," 0-0.txt") B~u{Lv TE  
        sampName  = nameArray(0) J U}XSb  
        Print "" JWlH(-U4|  
        Print "Sample name: " & Chr(9) & sampName >`'#4!}G5j  
    iDp]l u  
        'Open an output file and write the FRED header data X[h=UlF  
        Dim outFile As String ruB&&C6)v  
        outFile = cDir & sampName & "_FRED.txt" aE1h0`OT  
        Open outFile For Output As #1 QbxjfW"/+  
        Print #1, "type bsdf_data" ;9=9D{-4+  
        Print #1, "format angles=deg bsdf=value scale=1" $C,f>^1  
    P,CJy|[L  
        'Loop the file list, skip the two header lines and write the remaining data to file 4kxy7] W  
        Dim lineArray() As String, curLine As Long f ,K1a9.  
        For Each curFile In fList a%Mbq;  
            Print "Merging data from file " & curFile %q2dpzNW  
            ReadFile( cDir & curFile, lineArray ) j3Cpo x  
            For curLine = 2 To UBound(lineArray) PPPRO.y  
                Print #1, lineArray(curLine) L4 x  
            Next *~prI1e(  
        Next :==kC672  
    B/i,QBPF]  
        'Close the output file ]rZ"5y  
        Close #1 e>uV8!u  
    [^1;8Tbk  
        Print "Finished merging RPC data for sample " & sampName cV&(L]k>`  
        Print "FRED formatted data file: " & Chr(9) & outFile |X~T</{8i  
    End Sub xqmJPbA  
    *ZKfyn$+~  
    'Utility function to read the contents of a file into an array of strings. b0m1O.&I_  
    Function ReadFile(ByVal fileName As String, _ q<,?:g$k  
                      ByRef lineArray() As String) As Long =WJ*$j(  
    h9>~?1$lz  
        ReadFile = -1 YPf&y"E&H  
        Dim oFSO As Object s@^GjA[6+  
        Set oFSO = CreateObject("Scripting.FileSystemObject") W{=>c/  
        Erase lineArray }P-9\*hlm  
    ;G;vpl  
        Dim fid As Long 1a/@eqF''  
        If oFSO.fileexists( fileName ) Then vb5tyY0c  
            fid = FreeFile() MfCu\[qOz  
            Open fileName For Input As fid lv&<kYWY  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) u2-%~Rlo  
            Close fid m-*du(  
        End If H.O7Y  
        Set oFSO = Nothing _BHb0zeot  
        Return UBound( lineArray ) p?0 a"5Q  
     W* `2lf  
    End Function 7KuTC%7  
    g9GE0DbT`  
    Sub GetFileList( ByVal in_dir As String, _ wEKm3mY;  
                     ByRef in_flist() As String ) *2=:(OK  
    &R\ .^3  
        'Redimension the file list array afG b}8 Q9  
        Erase in_flist c .KpXY  
    N''9Bt+:  
        'Tracks how many files are found Kdik7jL/J  
        Dim fCount As Long :Oa|&.0l?  
        fCount = 0 amlE5GK;  
    M!!W>A@T[g  
        'Recurse directory and search for text files b==<7[8  
        Dim f As String W O|2x0K  
        f = Dir$(in_dir & "*.txt") ]/bf#&@g`k  
        While f <> "" 0qw,R4YK  
            ReDim Preserve in_flist(fCount) 1 /7H` O?  
            in_flist(fCount) = f E"pq ZP =  
            fCount += 1 VAsaJ`vcb  
            f = Dir$() 224I%x.,  
        Wend 2+sNt6B2  
        ReDim Preserve in_flist(fCount-1) vxk1RL*Xu  
    ZfL\3Mn  
    End Sub J3S@1"   
     
    分享到