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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 @uldD"MJ<]  
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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 zh*D2/ r  
    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。 %l!?d`?  
    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。 Hd\V?#H  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 0hV#]`9`gN  
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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。 4P k%+l  
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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) HFZ'xp|3dn  
    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 @,TIw[p  
    例如下所示: XhHgXVVGG<  
    Sample name:  EDF-C1-56  ;Pt8\X  
    Merging data from file EDF-C1-56 0-0.txt "(7y% TFt:  
    Finished merging RPC data for sample EDF-C1-56 !>n!Q*\(Ov  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >&KH!:OX|  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 rZJJ\ , |  
    a. 创建一个新的散射库 ~TEn +  
    b. 散射模型命名 $R/@8qnP W  
    c. 改变散射模型为“Tabulated BSDF”. |HD>m'e  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) {pIh/0  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 8qg%>ZU4d  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 SL-2^\R  
    g. 点击OK H.ksI;,  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 t{jY@J T|  
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    脚本代码 ! 6%?VJB|b  
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    '#Language "WWB-COM" p%>sc  
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    Option Explicit KtL?,zi  
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    Sub Main t.28IHJ  
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        'Cleanup *v+l,z4n  
        ClearOutputWindow() gHBvQ1g  
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        Print "Merging RPC Photonics BSDF Data Files" cZNcplt8  
        SetTextColor(255,0,0) cQj`W *  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." | 6JKB'  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." a31e.3 6g  
        SetTextColor(0,0,0) I.jqC2G  
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        'Current directory of this script (should be the same as the text files being merged) C!*!n^qA  
        Dim cDir As String v"o"W[  
        cDir = MacroDir$ & "\" <J&S[`U!  
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        'Array which will be populated with the list of files to be merged W/!P1M n  
        Dim fList() As String, curFile As String [! $N Tt_  
        GetFileList( cDir, fList ) K>$f#^  
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        Print "" .P)lQk\  
        Print "Files found for merging:" `|ie#L(:7/  
        For Each curFile In fList gM3:J:N  
            Print Chr(9) & curFile VO|ECB2e  
        Next ~i5YqH0  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <u!cdYo@  
        Dim nameArray() As String, sampName As String u[b |QR=5  
        nameArray = Split(fList(0)," 0-0.txt") sE% $]Jp  
        sampName  = nameArray(0) n^4R]9U  
        Print "" (?r,pAc:  
        Print "Sample name: " & Chr(9) & sampName 0hemXvv1  
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        'Open an output file and write the FRED header data <giBL L!  
        Dim outFile As String ."$t&[;s  
        outFile = cDir & sampName & "_FRED.txt" ]$@a.#}  
        Open outFile For Output As #1 Food<(!.>  
        Print #1, "type bsdf_data" :25LQf^nz  
        Print #1, "format angles=deg bsdf=value scale=1" p@Y=6Bw  
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        'Loop the file list, skip the two header lines and write the remaining data to file kXSX<b<%  
        Dim lineArray() As String, curLine As Long 1#A$&'&\J;  
        For Each curFile In fList }<04\t?  
            Print "Merging data from file " & curFile T$%|=gq  
            ReadFile( cDir & curFile, lineArray ) t WI-  
            For curLine = 2 To UBound(lineArray) m\`>N_4*9  
                Print #1, lineArray(curLine) )\akIA  
            Next $d?W1D<A  
        Next xqG<R5k>>  
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        'Close the output file dz_S6o ]  
        Close #1 @sXv5kZ:  
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        Print "Finished merging RPC data for sample " & sampName cV+?j}"*+  
        Print "FRED formatted data file: " & Chr(9) & outFile YaC%69C'  
    End Sub U] LDi8  
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    'Utility function to read the contents of a file into an array of strings. N[e,){v  
    Function ReadFile(ByVal fileName As String, _ L'= \|r  
                      ByRef lineArray() As String) As Long 4Z)s8sDKW  
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        ReadFile = -1 =>$)F 4LW  
        Dim oFSO As Object 6X \g7bg  
        Set oFSO = CreateObject("Scripting.FileSystemObject") n=.P46|  
        Erase lineArray 928_e)V  
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        Dim fid As Long m{/7)2.  
        If oFSO.fileexists( fileName ) Then ^jL '*&l  
            fid = FreeFile() uR0UfKK  
            Open fileName For Input As fid OIcXelS:@k  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ETp?RWXX  
            Close fid xlI =)ak{  
        End If cM#rus?)+  
        Set oFSO = Nothing b:dN )m  
        Return UBound( lineArray ) p#@#$u-  
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    End Function C96/   
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    Sub GetFileList( ByVal in_dir As String, _ _ \D %  
                     ByRef in_flist() As String ) #{cy(&cz  
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        'Redimension the file list array @-$8)?`q  
        Erase in_flist HlGSt$woX  
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        'Tracks how many files are found GcBqe=/B!  
        Dim fCount As Long ;*(-8R/  
        fCount = 0 Un6R)MVT  
    6r)P&J  
        'Recurse directory and search for text files ]~TsmR[  
        Dim f As String ^""edCs  
        f = Dir$(in_dir & "*.txt") a1Fx|#! mq  
        While f <> "" &hOz(825r  
            ReDim Preserve in_flist(fCount) H1bR+2s  
            in_flist(fCount) = f n!jmxl$  
            fCount += 1 1JJsYX  
            f = Dir$() >US*7m }  
        Wend H [=\_X1o(  
        ReDim Preserve in_flist(fCount-1) Y}?8  
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    End Sub rAenx Z,tF  
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