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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 miZ&9m  
    9n"D/NZB  
    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。
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    背景 ca1A9fvo  
    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。 z@3t>k|K  
    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。 O=Py XOf  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Yvu!Q  
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    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`krK"Ii  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    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) q}#4bB9  
    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 gzthM8A  
    例如下所示: L}1|R*b  
    Sample name:  EDF-C1-56 ;|f|d?Q\  
    Merging data from file EDF-C1-56 0-0.txt j\D_Z{m2  
    Finished merging RPC data for sample EDF-C1-56 *94<rlh{"  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt W"_")V=QBz  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 OFTyN^([@  
    a. 创建一个新的散射库 ljTnxg/? W  
    b. 散射模型命名 {re<S<j&  
    c. 改变散射模型为“Tabulated BSDF”. p ] V  
    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 ) %(,Kj ~0  
    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。 ;{79d8/=  
    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 Yp1;5Bbp  
    g. 点击OK I]|X6  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "RH pj3 si  
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    脚本代码 fWKI~/eUY|  
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    '#Language "WWB-COM" ua%$r[  
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    Option Explicit RjY(MSc  
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    Sub Main ykv,>nSXLL  
    W *t+!cU/:  
        'Cleanup z  %Ty;  
        ClearOutputWindow() dC$z q~q  
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        Print "Merging RPC Photonics BSDF Data Files" 9K`(Ys&  
        SetTextColor(255,0,0) {;6Yi!  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." "&s9;_9  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." B zmmE2~*  
        SetTextColor(0,0,0)  x w8 e  
    G=R`O1-3  
        'Current directory of this script (should be the same as the text files being merged) roDE?7x1  
        Dim cDir As String -\OvOkr  
        cDir = MacroDir$ & "\" Em?Z  
    ~)X yrKw  
        'Array which will be populated with the list of files to be merged 3":vjDq$  
        Dim fList() As String, curFile As String y3^<rff3Gc  
        GetFileList( cDir, fList ) uOzol~TU)  
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        Print "" ;x/do?FbT  
        Print "Files found for merging:" [ZC{eg+D  
        For Each curFile In fList +yvtd]D$2W  
            Print Chr(9) & curFile + niz(]  
        Next cn62:p]5  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. "]1 !<M6\i  
        Dim nameArray() As String, sampName As String -? _#Yttu  
        nameArray = Split(fList(0)," 0-0.txt") &\8qN_`  
        sampName  = nameArray(0) 7>#?-, B  
        Print "" $#VEC0  
        Print "Sample name: " & Chr(9) & sampName TI^W=5W@@  
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        'Open an output file and write the FRED header data cR'l\iv+  
        Dim outFile As String i2]7Bf)oV  
        outFile = cDir & sampName & "_FRED.txt" }HB>Zb5  
        Open outFile For Output As #1 z'=8U@P'#  
        Print #1, "type bsdf_data" zl?Gd4  
        Print #1, "format angles=deg bsdf=value scale=1" 87; E#2  
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        'Loop the file list, skip the two header lines and write the remaining data to file kiYHJ\a  
        Dim lineArray() As String, curLine As Long -|0nZ  
        For Each curFile In fList vO>Fj  
            Print "Merging data from file " & curFile "DN0|%`M/  
            ReadFile( cDir & curFile, lineArray ) 6_Ps*Ed  
            For curLine = 2 To UBound(lineArray) Gw!VPFV>W  
                Print #1, lineArray(curLine) ENZjRf4  
            Next =E6ND8l@2  
        Next <v&L90+s\;  
    2/XrorV  
        'Close the output file I5#KLZVg  
        Close #1 lZ5LHUzP  
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        Print "Finished merging RPC data for sample " & sampName _C`&(?}  
        Print "FRED formatted data file: " & Chr(9) & outFile ;Gc,-BDFw  
    End Sub #`Af  
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    'Utility function to read the contents of a file into an array of strings. =VC"X?N  
    Function ReadFile(ByVal fileName As String, _ i}u,_ }  
                      ByRef lineArray() As String) As Long ~Up5+7k@  
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        ReadFile = -1 / thFs4  
        Dim oFSO As Object ZhqGUb  
        Set oFSO = CreateObject("Scripting.FileSystemObject") P 2-^j)  
        Erase lineArray hn`yc7<}(u  
    ]>v C.iYp  
        Dim fid As Long azhilUD8  
        If oFSO.fileexists( fileName ) Then KgD sqwy  
            fid = FreeFile() k)j6rU  
            Open fileName For Input As fid mafnkQU  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) `T'[H/  
            Close fid a/wg%cWG_  
        End If ,xSNTOJ  
        Set oFSO = Nothing >H r&F nh+  
        Return UBound( lineArray ) 1U)U{i7j  
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    End Function PJfADB7Y  
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    Sub GetFileList( ByVal in_dir As String, _ u0Q 6 +U  
                     ByRef in_flist() As String ) 8}M-b6R V  
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        'Redimension the file list array ?^3Y+)}  
        Erase in_flist 3<XP/c";  
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        'Tracks how many files are found tDC?St1  
        Dim fCount As Long $~3?nib"j  
        fCount = 0 EpW89X  
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        'Recurse directory and search for text files :$=]*54`T  
        Dim f As String <lkt'iT=Sz  
        f = Dir$(in_dir & "*.txt") C1`fJh y  
        While f <> "" */_$' /q V  
            ReDim Preserve in_flist(fCount) gB_gjn\  
            in_flist(fCount) = f d[F3"b%  
            fCount += 1 xe4`D>LUo  
            f = Dir$() u+;iR/  
        Wend Nf5zQ@o_y  
        ReDim Preserve in_flist(fCount-1) X :#}E7]j  
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    End Sub <B Vx%  
     
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