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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 ;Q;j@yx  
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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 [*',pG  
    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。 &~,4$& _  
    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。 g":[rXvId  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 II\&)_S.4  
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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。  $GJT  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) YT\@fgBt  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ":Wq<Z'  
    例如下所示: bNea5u##  
    Sample name:  EDF-C1-56 Y?0/f[Ax,y  
    Merging data from file EDF-C1-56 0-0.txt ]O@$}B];)  
    Finished merging RPC data for sample EDF-C1-56 iM+` 7L'  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt -#|D>  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 :?t~|7O:  
    a. 创建一个新的散射库 qlO}=b/  
    b. 散射模型命名 un{ZysmtB6  
    c. 改变散射模型为“Tabulated BSDF”. 4%(Ji  
    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 ) [?!I*=*b  
    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。 1+x" 5<(W  
    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 A6&*VD  
    g. 点击OK *pKTJP  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 b^1QyX^?:  
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    脚本代码 ~66xO9s  
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    '#Language "WWB-COM" #z `W ,^C  
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    Option Explicit FwCb$yE#M  
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    Sub Main lPTx] =G  
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        'Cleanup 4QL>LK  
        ClearOutputWindow() d1 j9{  
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        Print "Merging RPC Photonics BSDF Data Files" .|UQ)J?s  
        SetTextColor(255,0,0) )BP*|URc  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." %Tm*^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." +a1x;  
        SetTextColor(0,0,0) Zi!Ta"}8  
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        'Current directory of this script (should be the same as the text files being merged) F@w; .e!  
        Dim cDir As String "W|A^@r}  
        cDir = MacroDir$ & "\" \CbJU  
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        'Array which will be populated with the list of files to be merged cnv>&6a)  
        Dim fList() As String, curFile As String w0pMH p'Y  
        GetFileList( cDir, fList ) YG p+[|'  
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        Print "" %bW_,b  
        Print "Files found for merging:" xP;r3u s  
        For Each curFile In fList C8N)!5(A  
            Print Chr(9) & curFile !rvEo =^  
        Next )Fw/Cu  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e[S`Dm"i)'  
        Dim nameArray() As String, sampName As String p?@ %/!S  
        nameArray = Split(fList(0)," 0-0.txt") 'rQ"Dc1D  
        sampName  = nameArray(0) B /? L$m  
        Print "" 7e/+C{3v  
        Print "Sample name: " & Chr(9) & sampName % RSZ.  
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        'Open an output file and write the FRED header data +6m.f,14q  
        Dim outFile As String I[ \~ pi,  
        outFile = cDir & sampName & "_FRED.txt" y_]+;%w:  
        Open outFile For Output As #1 =OVDJ0ozZ  
        Print #1, "type bsdf_data" 6 SSDc/  
        Print #1, "format angles=deg bsdf=value scale=1" yU?jmJ  
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        'Loop the file list, skip the two header lines and write the remaining data to file NkE0S`Xf  
        Dim lineArray() As String, curLine As Long ,Kit@`P%  
        For Each curFile In fList =bVPHrKNQ  
            Print "Merging data from file " & curFile .6B\fr.za  
            ReadFile( cDir & curFile, lineArray ) vqf$("  
            For curLine = 2 To UBound(lineArray) Hvl n>x@  
                Print #1, lineArray(curLine) 4E'9;tA3l  
            Next s='+[*&&  
        Next I`>U#x*  
    '`];=QY9pg  
        'Close the output file B@,9Cx564  
        Close #1 y4V:)@ P  
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        Print "Finished merging RPC data for sample " & sampName Mf}M/Fh  
        Print "FRED formatted data file: " & Chr(9) & outFile : Mf"   
    End Sub 6Rd4waj_,U  
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    'Utility function to read the contents of a file into an array of strings. iyskADS  
    Function ReadFile(ByVal fileName As String, _ x3@-E  
                      ByRef lineArray() As String) As Long +SJ.BmT  
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        ReadFile = -1 D}-.<  
        Dim oFSO As Object :5d>^6eoB?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") S63 Zk0(25  
        Erase lineArray nK&]8"  
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        Dim fid As Long 5J5si<v25  
        If oFSO.fileexists( fileName ) Then K*6"c.D  
            fid = FreeFile() 4<s.|W`  
            Open fileName For Input As fid 9KSi-2?H  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) xad`-vw  
            Close fid @=J|%NO  
        End If '<Z[e`/  
        Set oFSO = Nothing V\V /2u5-  
        Return UBound( lineArray ) Cs $5Of(  
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    End Function 0=d2_YzSf  
    1Pf(.&/9_  
    Sub GetFileList( ByVal in_dir As String, _ 49$P  
                     ByRef in_flist() As String ) 7#8Gn=g  
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        'Redimension the file list array V\~.  
        Erase in_flist `-NK:;^  
    ?^|`A}q#  
        'Tracks how many files are found \l+v,ELX=  
        Dim fCount As Long K}*ets1s}  
        fCount = 0 .nV2 n@SR  
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        'Recurse directory and search for text files jX53 owZ  
        Dim f As String 7y=>Wa?T[  
        f = Dir$(in_dir & "*.txt") p [O6  
        While f <> "" JJ.8V72;!Z  
            ReDim Preserve in_flist(fCount) Z\0Rw>#  
            in_flist(fCount) = f LZ*8YNp1'  
            fCount += 1 mh }M|h5Im  
            f = Dir$() 9hp&HL)BOa  
        Wend Uqr>8|t?  
        ReDim Preserve in_flist(fCount-1) yzK;  
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    End Sub /-=fWtA  
     
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