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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
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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 6./3w&D;  
    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。 6A9 r{'1  
    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。 U+FI^Xrt#  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 nWz7$O  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 -L&%,%  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) MGU%"7i'}  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ' V#$PZx  
    例如下所示: X&14;lu%p  
    Sample name:  EDF-C1-56 'NYW`,  
    Merging data from file EDF-C1-56 0-0.txt $4ZjNN@  
    Finished merging RPC data for sample EDF-C1-56 *H({q`j33k  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt o/~Rf1  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 'BO MFp7c  
    a. 创建一个新的散射库 1HS43!  
    b. 散射模型命名 8%Eau wAx  
    c. 改变散射模型为“Tabulated BSDF”. \\UOpl  
    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 ) gql^Inx<  
    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。 cWS 0B $$  
    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 si=m5$V  
    g. 点击OK qb 1JE[2F  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^Ez`WP  
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    脚本代码 0 F-db  
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    '#Language "WWB-COM" fDD^?/^  
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    Option Explicit 9T;DFUM  
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    Sub Main I:Q3r"1  
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        'Cleanup #)b0&wyW6i  
        ClearOutputWindow() J-d>#'Wb|  
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        Print "Merging RPC Photonics BSDF Data Files" $WICyI{$  
        SetTextColor(255,0,0) Mv\]uAT`  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 'S#D+oF(1~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." F*TkQ\y  
        SetTextColor(0,0,0) i8|0zI  
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        'Current directory of this script (should be the same as the text files being merged) q'1 86L87  
        Dim cDir As String  Xn=  
        cDir = MacroDir$ & "\" ` ),ACkU>U  
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        'Array which will be populated with the list of files to be merged YG K7b6  
        Dim fList() As String, curFile As String h"ZR`?h  
        GetFileList( cDir, fList ) bBg=X}9  
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        Print "" ]Mb:zs<r  
        Print "Files found for merging:" Tx:S{n7&  
        For Each curFile In fList B`mTp01  
            Print Chr(9) & curFile teX)!N [  
        Next /w "h'u  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. =";G&)H-  
        Dim nameArray() As String, sampName As String kxWcWl8  
        nameArray = Split(fList(0)," 0-0.txt") S2<evs1d  
        sampName  = nameArray(0) `RHhc{  
        Print "" <:ptNGR  
        Print "Sample name: " & Chr(9) & sampName Cc&SHG*R  
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        'Open an output file and write the FRED header data *iiyU}x  
        Dim outFile As String K.r "KxCm|  
        outFile = cDir & sampName & "_FRED.txt" v\3$$T)  
        Open outFile For Output As #1 x=YV*  
        Print #1, "type bsdf_data" IrMxdF~c  
        Print #1, "format angles=deg bsdf=value scale=1" _;'<}a  
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        'Loop the file list, skip the two header lines and write the remaining data to file OKV/=]GS  
        Dim lineArray() As String, curLine As Long MHPh!  
        For Each curFile In fList EK2mJCC|  
            Print "Merging data from file " & curFile S'}pUGDO  
            ReadFile( cDir & curFile, lineArray ) u#)ARCx,w  
            For curLine = 2 To UBound(lineArray) "|nh=!L  
                Print #1, lineArray(curLine) h[i@c`3 /2  
            Next wq:"/2p1  
        Next /zg|I?$>Z4  
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        'Close the output file X[J?  
        Close #1 hQ\W~3S55  
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        Print "Finished merging RPC data for sample " & sampName ]US  
        Print "FRED formatted data file: " & Chr(9) & outFile JIU8~D  
    End Sub D* QZR;D#.  
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    'Utility function to read the contents of a file into an array of strings. 4Qj@:b  
    Function ReadFile(ByVal fileName As String, _ _"h1#E  
                      ByRef lineArray() As String) As Long )MeeF-Ad6  
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        ReadFile = -1 uWjEyxPv{  
        Dim oFSO As Object :rSCoi>K  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ;D|g5$OE&  
        Erase lineArray K;lxPM]  
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        Dim fid As Long UH`cWVLpr  
        If oFSO.fileexists( fileName ) Then a_(T9pr  
            fid = FreeFile() g). IF.  
            Open fileName For Input As fid cceh`s=cU  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) QC<O=<$Q[  
            Close fid Jxsch\  
        End If X?++I 4\  
        Set oFSO = Nothing L "5;<  
        Return UBound( lineArray ) tJII-\3"  
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    End Function G'{*guYU  
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    Sub GetFileList( ByVal in_dir As String, _ CPci 'SO  
                     ByRef in_flist() As String ) guk{3<d:Jy  
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        'Redimension the file list array p-kug]qX  
        Erase in_flist Mz: "p.  
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        'Tracks how many files are found I78Q8W(5  
        Dim fCount As Long W%@0Ym `7  
        fCount = 0 -0>s`ruor  
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        'Recurse directory and search for text files pcNpr`  
        Dim f As String 0aa&13!5  
        f = Dir$(in_dir & "*.txt") |h-e+Wh1  
        While f <> "" n8Rsle`a  
            ReDim Preserve in_flist(fCount) q$kx/6=k  
            in_flist(fCount) = f  :X 9_~  
            fCount += 1 Odr<fvV,>  
            f = Dir$() ODKHI\U  
        Wend {r?+PQQ#  
        ReDim Preserve in_flist(fCount-1) .TO#\!KBv  
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    End Sub $_O;yz  
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