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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 r% +V8o  
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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 l~$+,U&XNe  
    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。 # }y2)g  
    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。 5yz(>EVH  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 *vwbgJG! *  
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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。 4v{o  
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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) ~o~!+`@q  
    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 #*UN >X  
    例如下所示: P`cq H(   
    Sample name:  EDF-C1-56 XcUwr  
    Merging data from file EDF-C1-56 0-0.txt ?m\t| /0Q  
    Finished merging RPC data for sample EDF-C1-56 @pRlxkvV  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt g0["^P1tV  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $cU!m(SILQ  
    a. 创建一个新的散射库 Yz +ZY  
    b. 散射模型命名 #;2n;.a  
    c. 改变散射模型为“Tabulated BSDF”. t,+nQ9  
    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 ) b?lD(fa&  
    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。 F}/S:(6LF2  
    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 Su/6Q$0 t  
    g. 点击OK Tq[kl'_  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 /Y2}a<3&0  
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    脚本代码 sW'2+|3"  
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    '#Language "WWB-COM" LQRQA[^  
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    Option Explicit 0?:} P  
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    Sub Main lHPd"3HDK  
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        'Cleanup st:`y=F_  
        ClearOutputWindow() 9CWezI+  
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        Print "Merging RPC Photonics BSDF Data Files" ]rH\`0  
        SetTextColor(255,0,0) Gsq00j &<Z  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." '6cWS'9"  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." V8C:"UZ;  
        SetTextColor(0,0,0) q(.sq12<<W  
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        'Current directory of this script (should be the same as the text files being merged) ZJzt~ H  
        Dim cDir As String 87 $dBb{  
        cDir = MacroDir$ & "\" %u5L!W&  
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        'Array which will be populated with the list of files to be merged %4,O 2\0?&  
        Dim fList() As String, curFile As String sHt].gZ  
        GetFileList( cDir, fList ) 2q=AEv/  
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        Print "" xqG[~)~  
        Print "Files found for merging:" )f[ B6Y  
        For Each curFile In fList 0uOkMuy<  
            Print Chr(9) & curFile "!ug_'VW  
        Next :~tAUy":_*  
    AQ,' 6F9  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. g"p%C:NN  
        Dim nameArray() As String, sampName As String p93r'&Q  
        nameArray = Split(fList(0)," 0-0.txt") 6z#acE1)M  
        sampName  = nameArray(0) 8QLj["   
        Print "" Cz\e w B  
        Print "Sample name: " & Chr(9) & sampName mGJKvJF   
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        'Open an output file and write the FRED header data S >X:ZYYC  
        Dim outFile As String 75f"'nJ)  
        outFile = cDir & sampName & "_FRED.txt" wsZF;8ut  
        Open outFile For Output As #1 M/>7pZW  
        Print #1, "type bsdf_data" QkEvw<  
        Print #1, "format angles=deg bsdf=value scale=1" ODNM+#}`  
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        'Loop the file list, skip the two header lines and write the remaining data to file n 22zq6m  
        Dim lineArray() As String, curLine As Long Ln')QN  
        For Each curFile In fList v &Yi  
            Print "Merging data from file " & curFile .w=/+TA  
            ReadFile( cDir & curFile, lineArray ) aQ?/%\>  
            For curLine = 2 To UBound(lineArray) fTS5 yb%  
                Print #1, lineArray(curLine) |:nOp(A\*  
            Next A}G7l?V&  
        Next zZPuha8  
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        'Close the output file %Gz0^[+  
        Close #1 R_W+Ylob  
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        Print "Finished merging RPC data for sample " & sampName J%v=yBC2  
        Print "FRED formatted data file: " & Chr(9) & outFile p{amC ;cI$  
    End Sub 3G,Oba[$<  
    `#F{Waww'  
    'Utility function to read the contents of a file into an array of strings. +Mo9kC  
    Function ReadFile(ByVal fileName As String, _ "pi=$/RD9  
                      ByRef lineArray() As String) As Long DBW[{D E  
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        ReadFile = -1 S!jTyY7e  
        Dim oFSO As Object Q('r<v96  
        Set oFSO = CreateObject("Scripting.FileSystemObject") TyD4|| %  
        Erase lineArray L-jJg,eY  
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        Dim fid As Long &zl|87M  
        If oFSO.fileexists( fileName ) Then 3 }TaF~  
            fid = FreeFile() 7 E r23Q  
            Open fileName For Input As fid d A@]!  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) p `8 s  
            Close fid T*8VDY7  
        End If \\PjKAsh  
        Set oFSO = Nothing 1n >X[! 8x  
        Return UBound( lineArray ) 3GaQk-  
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    End Function \8)U!9,$nn  
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    Sub GetFileList( ByVal in_dir As String, _ .*@;@06?  
                     ByRef in_flist() As String ) ^crCy-`#  
    I WTwz!+  
        'Redimension the file list array 7`- Zuf  
        Erase in_flist ^=BTz9QM  
    A>vBQN  
        'Tracks how many files are found m!|kW{B#A  
        Dim fCount As Long 9_q#W'/X  
        fCount = 0 $? m9")  
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        'Recurse directory and search for text files PlU*X8  
        Dim f As String B-?6M6#  
        f = Dir$(in_dir & "*.txt") Ed0QQyC@9  
        While f <> "" 1t:Q_j0Ym  
            ReDim Preserve in_flist(fCount) G"-?&)M#a  
            in_flist(fCount) = f 6LOnU~l,  
            fCount += 1 p#01gB  
            f = Dir$() 6*PYFf`  
        Wend H{@Yo\J  
        ReDim Preserve in_flist(fCount-1) l7XUXbYp&=  
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    End Sub i2@VB6]?  
     
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