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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 Y]NSN-t  
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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 /a^1_q-bX  
    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。 z8QAo\_I(  
    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;._HJ(  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ~KW,kyXBnD  
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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。 q[HTnx  
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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) e?opkq\f  
    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 'XZ) !1N  
    例如下所示: MOsl_^c  
    Sample name:  EDF-C1-56 BnCbon)  
    Merging data from file EDF-C1-56 0-0.txt ])L A42|  
    Finished merging RPC data for sample EDF-C1-56 U'R)x";=  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt gUxP>hB  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 4G$|Rx[{,  
    a. 创建一个新的散射库 0(mkeIzJt/  
    b. 散射模型命名 +VCGlr  
    c. 改变散射模型为“Tabulated BSDF”. D[^m{ 9_  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) D$bIo "  
    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。 hvA^n@nr  
    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 <z]cyXv/  
    g. 点击OK \<y`!"c  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 pcYG~pZ9  
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    脚本代码 I 6<*X  
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    '#Language "WWB-COM" L1i eaKw  
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    Option Explicit |55N?=8  
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    Sub Main Q.]}]QE   
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        'Cleanup 4zJtOK?r"  
        ClearOutputWindow() P5 K' p5}#  
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        Print "Merging RPC Photonics BSDF Data Files" 3E>frR\!I  
        SetTextColor(255,0,0) KcK>%%  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." gA:5M  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 5Cq{XcXV  
        SetTextColor(0,0,0) Ttxqf:OMf  
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        'Current directory of this script (should be the same as the text files being merged) O9EKRt  
        Dim cDir As String JcbwDlUb  
        cDir = MacroDir$ & "\" >S'17D  
    5]HS^II"  
        'Array which will be populated with the list of files to be merged blTo5NLX  
        Dim fList() As String, curFile As String \RvvHty-V  
        GetFileList( cDir, fList ) y($%;l   
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        Print "" "\}@gV#r$A  
        Print "Files found for merging:" Md0 s K  
        For Each curFile In fList 7VMvF/ap]u  
            Print Chr(9) & curFile <5NF;  
        Next =|I>G?g-  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. `e(vH`VZ  
        Dim nameArray() As String, sampName As String d!:6[7X6  
        nameArray = Split(fList(0)," 0-0.txt") HYD"#m'TkB  
        sampName  = nameArray(0) H&]gOs3So  
        Print "" AwslWkd=  
        Print "Sample name: " & Chr(9) & sampName >2,Gy-&"0  
    'bo~%WA]n  
        'Open an output file and write the FRED header data T}"6wywM  
        Dim outFile As String  ^}:#  
        outFile = cDir & sampName & "_FRED.txt" +"8,Mh  
        Open outFile For Output As #1 M-[ $L XR  
        Print #1, "type bsdf_data" _cc#Qlw 7  
        Print #1, "format angles=deg bsdf=value scale=1" 7.Z@Wr?  
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        'Loop the file list, skip the two header lines and write the remaining data to file {K9/H qH  
        Dim lineArray() As String, curLine As Long n84GZ5O>7  
        For Each curFile In fList sO.`x*  
            Print "Merging data from file " & curFile G.( mp<-  
            ReadFile( cDir & curFile, lineArray ) ~ug= {b  
            For curLine = 2 To UBound(lineArray) Hd,p!_  
                Print #1, lineArray(curLine) e_/b2"{  
            Next LxpuhvIO  
        Next ]79:yMD~ba  
    %K>.lh@  
        'Close the output file g_G6~-.9I  
        Close #1 oiX+l5`pz  
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        Print "Finished merging RPC data for sample " & sampName  jcI&w#re  
        Print "FRED formatted data file: " & Chr(9) & outFile |i ZfYi&^  
    End Sub aBNZdX]vzO  
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    'Utility function to read the contents of a file into an array of strings. 7DIIx}A  
    Function ReadFile(ByVal fileName As String, _ v>Mnl  
                      ByRef lineArray() As String) As Long CT1ja.\;  
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        ReadFile = -1 2'5]~  
        Dim oFSO As Object j%y$_9a7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") "m^' &L  
        Erase lineArray ~_s{0g]B  
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        Dim fid As Long ,}:G\u*Fu  
        If oFSO.fileexists( fileName ) Then bd<m%OM""  
            fid = FreeFile() dlG=Vq&Y  
            Open fileName For Input As fid WdnIp!  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ZeEWp3vW  
            Close fid ND5`Q"k   
        End If  OX"j#  
        Set oFSO = Nothing UQ[B?jc  
        Return UBound( lineArray ) !vk|<P1  
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    End Function &[At`Nw71  
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    Sub GetFileList( ByVal in_dir As String, _ ^k Cn*&  
                     ByRef in_flist() As String ) ^qC;Nh4F  
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        'Redimension the file list array l983vKr  
        Erase in_flist {U84 _Pi  
    ]>+PnP35G  
        'Tracks how many files are found \4AM*lZ  
        Dim fCount As Long sYdRh?Hq  
        fCount = 0 J@OB`2?Zv  
    ** +e7k   
        'Recurse directory and search for text files KL ?@@7  
        Dim f As String 0d3+0EN{  
        f = Dir$(in_dir & "*.txt") lt_']QqU  
        While f <> "" ~u.T-0F  
            ReDim Preserve in_flist(fCount) Y2O"]phi@  
            in_flist(fCount) = f ,:%"-`a%  
            fCount += 1 rY p3(k3  
            f = Dir$() t w(JZDc  
        Wend NNF>Xa`9,  
        ReDim Preserve in_flist(fCount-1) UK{irU|\  
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    End Sub  ru`U'  
     
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