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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 bu"!jHPB  
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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 Tac$LS\Q  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 3yXY.>'  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 _-Fs# f8  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zv"Z DRW  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 \^%}M!tan  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) }iuw5dik+  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 @ry_nKr9  
    例如下所示: ?F;8Pa/  
    Sample name:  EDF-C1-56 PiYxk+N  
    Merging data from file EDF-C1-56 0-0.txt .6'qoo_N  
    Finished merging RPC data for sample EDF-C1-56 6MkP |vr6  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt BVO<e \>3  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Tu7QCr5*  
    a. 创建一个新的散射库 09Cez\0  
    b. 散射模型命名 O1mKe%'|  
    c. 改变散射模型为“Tabulated BSDF”. ?K\axf>F  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) F@:'J\I}:  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ;d9QAN&0}  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 IB7E}56l  
    g. 点击OK U`m54f@U  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 r$~HfskeI  
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    脚本代码 k)Qtfj}uij  
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    '#Language "WWB-COM" Y.r+wc]  
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    Option Explicit \;"=QmRD%:  
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    Sub Main 9p2&) kb6  
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        'Cleanup xlg9TvvI  
        ClearOutputWindow() igR";OQk  
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        Print "Merging RPC Photonics BSDF Data Files" A$:U'ZG_  
        SetTextColor(255,0,0) w: Kl6"c  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 46&/gehr  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." *ppffz  
        SetTextColor(0,0,0) s}% M4  
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        'Current directory of this script (should be the same as the text files being merged) `lt"[K<  
        Dim cDir As String P(z++A&  
        cDir = MacroDir$ & "\" OH(waKq2I  
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        'Array which will be populated with the list of files to be merged pD#rnp>WWt  
        Dim fList() As String, curFile As String q(2'\ _`u  
        GetFileList( cDir, fList ) r? E)obE  
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        Print "" ah+iZ}E%  
        Print "Files found for merging:" [^98fAlz6  
        For Each curFile In fList RuVGG)  
            Print Chr(9) & curFile 4u5-7[TZ  
        Next g~A`N=r;h  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ByNn  
        Dim nameArray() As String, sampName As String 1F&Trqq  
        nameArray = Split(fList(0)," 0-0.txt") o="M  
        sampName  = nameArray(0) W+ko q*P  
        Print "" =mp;.k95  
        Print "Sample name: " & Chr(9) & sampName wyO4Y  
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        'Open an output file and write the FRED header data aH/ k Ua  
        Dim outFile As String X=fYWj[H,  
        outFile = cDir & sampName & "_FRED.txt" Ks`J([(W&  
        Open outFile For Output As #1 [;) ,\\u,d  
        Print #1, "type bsdf_data" f5VLw`m}.8  
        Print #1, "format angles=deg bsdf=value scale=1" jQ^|3#L\  
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        'Loop the file list, skip the two header lines and write the remaining data to file WuUk9_ g  
        Dim lineArray() As String, curLine As Long iN8zo:&Z  
        For Each curFile In fList *VhL\IjN]  
            Print "Merging data from file " & curFile qm8B8&-  
            ReadFile( cDir & curFile, lineArray ) IE/^\ M  
            For curLine = 2 To UBound(lineArray) A1>OY^p3%  
                Print #1, lineArray(curLine) ]{mPh\  
            Next G.a bql  
        Next l$pm_%@2]  
    mQ 26K~  
        'Close the output file 1+{{EOZ4  
        Close #1 Y;^l%ePuW  
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        Print "Finished merging RPC data for sample " & sampName k],Q9  
        Print "FRED formatted data file: " & Chr(9) & outFile hxd`OG<gF  
    End Sub 'Nn zk  
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    'Utility function to read the contents of a file into an array of strings. nIy}#MUd|q  
    Function ReadFile(ByVal fileName As String, _ k(7&N0V%zz  
                      ByRef lineArray() As String) As Long ;1O_M9  
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        ReadFile = -1 Nk VK  
        Dim oFSO As Object &n}f?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") hwBfdZ  
        Erase lineArray dkBIx$t  
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        Dim fid As Long e95Lo+:f  
        If oFSO.fileexists( fileName ) Then (WO]Xq<  
            fid = FreeFile() j8{i#;s!"  
            Open fileName For Input As fid ?5|>@>  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) suiS&$-E  
            Close fid J76kkW`5  
        End If j2.|ln"!  
        Set oFSO = Nothing hl(hJfp  
        Return UBound( lineArray ) BmMGx8P  
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    End Function 9gEwh<  
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    Sub GetFileList( ByVal in_dir As String, _ yyRiP|hJ  
                     ByRef in_flist() As String ) 1AfnzGvA  
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        'Redimension the file list array e~[/i\  
        Erase in_flist " H&W}N  
    37 ,  
        'Tracks how many files are found %D}kD6=  
        Dim fCount As Long (%e .:W${  
        fCount = 0 9_rYBX  
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        'Recurse directory and search for text files *,8^@(th  
        Dim f As String mD0f<gJ1  
        f = Dir$(in_dir & "*.txt") A8fOQ  
        While f <> "" RJ ||}5  
            ReDim Preserve in_flist(fCount) }{qZ[/JwqN  
            in_flist(fCount) = f EZy)A$|  
            fCount += 1 l7259Ro~  
            f = Dir$() (vPN5F  
        Wend XQs1eP'{  
        ReDim Preserve in_flist(fCount-1) % X+:o]T  
    [.8BTj1%  
    End Sub qL&[K>2z  
     
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