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    [分享]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: 2020-12-15
    摘要 gADt%K2 #Z  
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    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 ?/#HTg)!B  
    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。 ( }JX ]-  
    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。 P[XE5puC  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 lt,x(2  
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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。 CoJaVLl  
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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) 1+#Vj#  
    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 Fdc bmQ  
    例如下所示: Zpu>T2Tp  
    Sample name:  EDF-C1-56 VJ_E]}H  
    Merging data from file EDF-C1-56 0-0.txt Qt>yRt  
    Finished merging RPC data for sample EDF-C1-56 f+<-Jc  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2vj)3%:7#E  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8{?Oi'-|0  
    a. 创建一个新的散射库 %HYC-TF#  
    b. 散射模型命名 8(Z*Vz uu  
    c. 改变散射模型为“Tabulated BSDF”. Zls4@/\Q  
    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 ) /jj}.X7yH  
    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。 LgUaX  
    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 +hXph  
    g. 点击OK [FyE{NfiJ%  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #+Vvf  
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    脚本代码 |&RdOjw$u  
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    '#Language "WWB-COM" (x.K%QC)  
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    Option Explicit p(0!TCBs  
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    Sub Main A|y&\~<A  
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        'Cleanup _HGDqj L  
        ClearOutputWindow() fWKv3S1dT  
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        Print "Merging RPC Photonics BSDF Data Files" &lGp /m:  
        SetTextColor(255,0,0) ^lf;Lc  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 8swj'SjX  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." L}:u9$w  
        SetTextColor(0,0,0) .4-;  
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        'Current directory of this script (should be the same as the text files being merged) aNXu"US+Sp  
        Dim cDir As String fep#Kb%"e  
        cDir = MacroDir$ & "\" S4?ss I  
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        'Array which will be populated with the list of files to be merged TAzhD.6C  
        Dim fList() As String, curFile As String FirmzB Il5  
        GetFileList( cDir, fList ) 9.%{M#j  
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        Print "" AV&W&$  
        Print "Files found for merging:" vhhsOga  
        For Each curFile In fList YO-O-NEP  
            Print Chr(9) & curFile IS'=%qhC`  
        Next 8Cm^#S,+  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .[O*bk  
        Dim nameArray() As String, sampName As String }"xC1<]  
        nameArray = Split(fList(0)," 0-0.txt") \>I&UFfH)4  
        sampName  = nameArray(0) #Va@4<4r  
        Print "" \:" s*-  
        Print "Sample name: " & Chr(9) & sampName b(~NqV!i  
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        'Open an output file and write the FRED header data U 2\{ ( y  
        Dim outFile As String KgKV(q=  
        outFile = cDir & sampName & "_FRED.txt" g7d)YUc  
        Open outFile For Output As #1 zo]7#  
        Print #1, "type bsdf_data" 6dg[   
        Print #1, "format angles=deg bsdf=value scale=1" L:B&`,E  
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        'Loop the file list, skip the two header lines and write the remaining data to file tk, H vE  
        Dim lineArray() As String, curLine As Long PU-;Q@< E  
        For Each curFile In fList L'[ '7  
            Print "Merging data from file " & curFile cQ+V 4cW Z  
            ReadFile( cDir & curFile, lineArray ) [_H9l)  
            For curLine = 2 To UBound(lineArray) K<|eZhp~  
                Print #1, lineArray(curLine) |dXS+R1  
            Next jkPXkysm  
        Next 6=  9  
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        'Close the output file -{P)\5.L  
        Close #1 >:wk.<Z-  
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        Print "Finished merging RPC data for sample " & sampName O`Z>Oon?  
        Print "FRED formatted data file: " & Chr(9) & outFile 1 k H  
    End Sub ]bS\*q0Zf(  
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    'Utility function to read the contents of a file into an array of strings. KE(kR>OB]  
    Function ReadFile(ByVal fileName As String, _ +%>L;'L ^X  
                      ByRef lineArray() As String) As Long rU'&o) a^  
    _;0:wXib =  
        ReadFile = -1 ?|8H $1  
        Dim oFSO As Object w@oq.K  
        Set oFSO = CreateObject("Scripting.FileSystemObject") y8,es$  
        Erase lineArray tpCEWdn5  
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        Dim fid As Long )ns;S  
        If oFSO.fileexists( fileName ) Then 2gFQHV  
            fid = FreeFile() } 10Dvt>+  
            Open fileName For Input As fid R?]>8o,  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) LFh(. }  
            Close fid /?by4v73P  
        End If [i&tE.7  
        Set oFSO = Nothing RNIfw1R  
        Return UBound( lineArray ) ;N4mR6  
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    End Function Ie+z"&0  
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    Sub GetFileList( ByVal in_dir As String, _ -pLb%f0?  
                     ByRef in_flist() As String ) zM)o^Fn2  
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        'Redimension the file list array K,^b=_]  
        Erase in_flist ,,,5pCi\  
    _39b8s {  
        'Tracks how many files are found 6%fU}si,  
        Dim fCount As Long i44KTC"sB  
        fCount = 0 47t^{WrT  
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        'Recurse directory and search for text files 0eb`9yM  
        Dim f As String [ 9$>N  
        f = Dir$(in_dir & "*.txt") `%rqQnVB  
        While f <> "" Ou,B3kuQ+  
            ReDim Preserve in_flist(fCount) 7AtJ6  
            in_flist(fCount) = f /S|Pq!4<  
            fCount += 1 1_<'S34  
            f = Dir$() EI/_=.d  
        Wend a0.)zgWr  
        ReDim Preserve in_flist(fCount-1) h{>8W0W*  
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    End Sub 9BHl 2<&V  
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