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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 u&1n~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 BL6t>  
    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。 8P.UB{QNe  
    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。 h7<Zkf  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Dp!3uR ']p  
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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。 Px5ArSS  
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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) {@1.2AWg  
    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 iJuh1+6:c9  
    例如下所示: LS@[O])$'  
    Sample name:  EDF-C1-56 &#aQ mgDF  
    Merging data from file EDF-C1-56 0-0.txt =wHHR1e  
    Finished merging RPC data for sample EDF-C1-56 I <`9ANe  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt G=a.Wff  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2j8^Z  
    a. 创建一个新的散射库 $Z(fPKRN/  
    b. 散射模型命名 Oi+(`  
    c. 改变散射模型为“Tabulated BSDF”. Xm&L@2V  
    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 ) o B;EP  
    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。 betN-n-  
    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 ]uO 8  
    g. 点击OK \^2%v~  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 qW[p .jN  
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    脚本代码 jca7Cx`sm  
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    '#Language "WWB-COM" Va,M9)F  
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    Option Explicit ~Fv&z'R  
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    Sub Main g=.~_&O  
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        'Cleanup eSf e s  
        ClearOutputWindow() [b-27\b  
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        Print "Merging RPC Photonics BSDF Data Files" 50% |9D0?Y  
        SetTextColor(255,0,0) TtEc~m  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." YgiwtZ5FY  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." rBLkowDP*  
        SetTextColor(0,0,0) =ZM#_uW  
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        'Current directory of this script (should be the same as the text files being merged) bUbM}  
        Dim cDir As String /l_ $1<c  
        cDir = MacroDir$ & "\" 6+"P$Ed#i  
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        'Array which will be populated with the list of files to be merged G%~=hEK0  
        Dim fList() As String, curFile As String R< @o]p  
        GetFileList( cDir, fList ) (yQ]n91Q,  
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        Print "" $~c?qU  
        Print "Files found for merging:" (UmoG  
        For Each curFile In fList <cG .V |B  
            Print Chr(9) & curFile [z#C&gDt  
        Next fo~8W`H&  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7><ne|%  
        Dim nameArray() As String, sampName As String FSv')`}  
        nameArray = Split(fList(0)," 0-0.txt") wJ-G7V,)  
        sampName  = nameArray(0) 1L1_x'tT%  
        Print "" <y5V],-U  
        Print "Sample name: " & Chr(9) & sampName iK{q_f\"  
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        'Open an output file and write the FRED header data 7 y}b (q=  
        Dim outFile As String rm2"pfs  
        outFile = cDir & sampName & "_FRED.txt" 5(bG  
        Open outFile For Output As #1 m)9N9Ii#)  
        Print #1, "type bsdf_data" ~d6 _  
        Print #1, "format angles=deg bsdf=value scale=1" RL/~E xYC  
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        'Loop the file list, skip the two header lines and write the remaining data to file EJY[M  
        Dim lineArray() As String, curLine As Long p#~' xq  
        For Each curFile In fList `HU`=a&d  
            Print "Merging data from file " & curFile 8[5%l7's  
            ReadFile( cDir & curFile, lineArray ) }CZ,WJz=  
            For curLine = 2 To UBound(lineArray) EB jiSQw  
                Print #1, lineArray(curLine) Nw $io8:d  
            Next c.jq?Q k  
        Next  =Run  
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        'Close the output file pHFlO!#]|  
        Close #1 o+{}O_r  
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        Print "Finished merging RPC data for sample " & sampName 5} |O  
        Print "FRED formatted data file: " & Chr(9) & outFile {;^boo q  
    End Sub ]YkF^Pf!v  
    .E!7}O6  
    'Utility function to read the contents of a file into an array of strings. $+Ke$fq.>  
    Function ReadFile(ByVal fileName As String, _ w=\Lw+X  
                      ByRef lineArray() As String) As Long |o~<Ti6]  
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        ReadFile = -1 OqUEj 0X  
        Dim oFSO As Object ~jAOGo/&6  
        Set oFSO = CreateObject("Scripting.FileSystemObject") XP5q4BM  
        Erase lineArray 0K7]<\)  
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        Dim fid As Long =N01!?{  
        If oFSO.fileexists( fileName ) Then (FZL>  
            fid = FreeFile() ^ cN-   
            Open fileName For Input As fid * JGm  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) b_ Sh#d&  
            Close fid >JS\H6  
        End If n"Ec%n  
        Set oFSO = Nothing u,[Yaw"L  
        Return UBound( lineArray ) M]!\X6<_  
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    End Function w(`X P  
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    Sub GetFileList( ByVal in_dir As String, _ ,HS\(Z  
                     ByRef in_flist() As String ) !.iu_xJ  
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        'Redimension the file list array 0*V RFd4  
        Erase in_flist Cca( oV  
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        'Tracks how many files are found +xRja(d6  
        Dim fCount As Long i\2MphS  
        fCount = 0 AQ. Y-'\t  
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        'Recurse directory and search for text files l W'6rat  
        Dim f As String 7^Uv1ezDR  
        f = Dir$(in_dir & "*.txt") TJ7on.;  
        While f <> "" Svn|vH  
            ReDim Preserve in_flist(fCount) `Q1T-H_  
            in_flist(fCount) = f gj\r>~S  
            fCount += 1 KJ,{w?p~ )  
            f = Dir$() '1ff|c!x9  
        Wend N::_JH? ^=  
        ReDim Preserve in_flist(fCount-1) >!E:$;i@  
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    End Sub IkH]W!_+  
     
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