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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 ]l~TI8gC  
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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 ;]/emw=a  
    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。 aJmSagr69C  
    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。 f=f8) +5  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 =jWcD{;1I}  
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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。 )nI}KQJ<  
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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) .*3.47O  
    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 Wvg+5Q  
    例如下所示: vfn _Nq;  
    Sample name:  EDF-C1-56 \N[Z58R !z  
    Merging data from file EDF-C1-56 0-0.txt a fOix"  
    Finished merging RPC data for sample EDF-C1-56 p;P"mp\'  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^^O @ [_  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pel{ ;r  
    a. 创建一个新的散射库 Xv~v=.HNhk  
    b. 散射模型命名 LxcC5/@\~(  
    c. 改变散射模型为“Tabulated BSDF”. -{^IT`  
    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 ) Tgf#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。 Xqz\%&G  
    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 feI%QnK)U  
    g. 点击OK [i&EUvo  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Ui^~A  
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    脚本代码 f<$>?o&y  
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    '#Language "WWB-COM" ;E!(W=]*F  
    !P_8D*^9  
    Option Explicit L355uaj  
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    Sub Main b!h*I>`  
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        'Cleanup 0G=bu5  
        ClearOutputWindow() KliMw*5(  
    " 0:&x n8L  
        Print "Merging RPC Photonics BSDF Data Files" eL vbPE_  
        SetTextColor(255,0,0) YEbB3N  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 'pa>;{  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." -F-RWs{yS  
        SetTextColor(0,0,0) e\[z Q 2Z3  
    <fZ?F=  
        'Current directory of this script (should be the same as the text files being merged) swfcA\7R  
        Dim cDir As String Dm")\"5\?  
        cDir = MacroDir$ & "\" qId-v =L  
    "X.JD  
        'Array which will be populated with the list of files to be merged $wQkTx  
        Dim fList() As String, curFile As String vLc7RL  
        GetFileList( cDir, fList ) v}Gpw6   
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        Print "" 6c?;-5.  
        Print "Files found for merging:" w6PKr^  
        For Each curFile In fList o)(N*tC  
            Print Chr(9) & curFile 6<uJ}3  
        Next l\?HeVk^  
    iPD5 KsAOA  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9L"Z ~CUL  
        Dim nameArray() As String, sampName As String T~238C{vh  
        nameArray = Split(fList(0)," 0-0.txt") "M GX(SQ  
        sampName  = nameArray(0) )t$<FP  
        Print "" o:p6[SGd  
        Print "Sample name: " & Chr(9) & sampName d-W@/J  
    >I~$h,  
        'Open an output file and write the FRED header data iq25|{1$  
        Dim outFile As String 8Moe8X#3  
        outFile = cDir & sampName & "_FRED.txt" h6yXW! 8  
        Open outFile For Output As #1 ]d}h`!:  
        Print #1, "type bsdf_data" WT-BHB1  
        Print #1, "format angles=deg bsdf=value scale=1" -=tf)  
    yR`X3.:*]  
        'Loop the file list, skip the two header lines and write the remaining data to file d>RoH]K4  
        Dim lineArray() As String, curLine As Long ed=pRb  
        For Each curFile In fList ]YO &_#  
            Print "Merging data from file " & curFile &gDwsW  
            ReadFile( cDir & curFile, lineArray ) 3y[uH'  
            For curLine = 2 To UBound(lineArray) zQ&k$l9  
                Print #1, lineArray(curLine) 4/z K3%J  
            Next TL29{'4V  
        Next _7)>/YK?}4  
    aB=&XGV9  
        'Close the output file nB~hmE)  
        Close #1 ZQ%4]=w  
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        Print "Finished merging RPC data for sample " & sampName b`lLqV<[cB  
        Print "FRED formatted data file: " & Chr(9) & outFile sDylSYq  
    End Sub s_/a1o  
    rx$B(z(c  
    'Utility function to read the contents of a file into an array of strings. \$g,Hgp/<  
    Function ReadFile(ByVal fileName As String, _ p#]D-?CM)  
                      ByRef lineArray() As String) As Long *2? -6  
    v$P<:M M  
        ReadFile = -1 L.E6~Rv  
        Dim oFSO As Object E1=WH-iA0  
        Set oFSO = CreateObject("Scripting.FileSystemObject") kF1Tg KSd  
        Erase lineArray }o'WR'LX  
    o'Uaz*-po  
        Dim fid As Long >Q`\|m}x)Q  
        If oFSO.fileexists( fileName ) Then BE#s@-zR=p  
            fid = FreeFile() | 4slG   
            Open fileName For Input As fid jMpV c E#  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) !xIK<H{*  
            Close fid SZ;Is,VgU4  
        End If 0xSWoz[i6~  
        Set oFSO = Nothing <\9M+  
        Return UBound( lineArray ) bm</qF'T6  
    qwERy{]Sp;  
    End Function AjW5H*  
    /OX;3" +1  
    Sub GetFileList( ByVal in_dir As String, _ $4*wK@xu  
                     ByRef in_flist() As String ) K [.*8  
    |5;:3K+  
        'Redimension the file list array &f;<[_QI=  
        Erase in_flist ,4OH9 -Q1  
    [!<W{ ($5  
        'Tracks how many files are found /^2&@P7  
        Dim fCount As Long vmY 88Kx&S  
        fCount = 0 MYmH?A  
    )Rlh[Y& r  
        'Recurse directory and search for text files w[/_o,R  
        Dim f As String \qo}}I>e  
        f = Dir$(in_dir & "*.txt") kT=KxS{  
        While f <> "" ++d%D9*V<  
            ReDim Preserve in_flist(fCount) Uyuvmt>  
            in_flist(fCount) = f ;PA^.RB  
            fCount += 1 q#6K'=AC  
            f = Dir$() Y*KP1=Md  
        Wend @[s+5_9nk  
        ReDim Preserve in_flist(fCount-1) cD6T4  
    G2,9$8qE  
    End Sub BJL*Dih m[  
     
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