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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 E2.!|u2  
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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 nS.qK/.s  
    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。 :Us+u-~  
    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。 *|L;&XM&/  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 {Ov{O,c 5  
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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。 j/ARTaO1]"  
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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) pd.pY*B<[  
    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 l u{6  
    例如下所示: ?4W6TSW-'  
    Sample name:  EDF-C1-56 CzDg?wb  
    Merging data from file EDF-C1-56 0-0.txt n5fc_N/8O=  
    Finished merging RPC data for sample EDF-C1-56 @lh]? |*[  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <]`|HJoy  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^ Vc(oa&;  
    a. 创建一个新的散射库 SU~ljAF4  
    b. 散射模型命名 k$7Kz"  
    c. 改变散射模型为“Tabulated BSDF”. 4a.8n!sys  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) { "f} }}l  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 {HVsRpNEf  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 DsHm,dZ  
    g. 点击OK zrC1/%T  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [raj: 7yQ  
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    脚本代码 zItGoJu  
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    '#Language "WWB-COM" G*zhy!P  
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    Option Explicit 7Mh!@Rd_V  
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    Sub Main Vk1 c14i>  
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        'Cleanup H]{`q  
        ClearOutputWindow() %=vU Z4  
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        Print "Merging RPC Photonics BSDF Data Files"  O&dh<  
        SetTextColor(255,0,0) gm: xtN  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." O%} hNTS"  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." xu'b@G}12  
        SetTextColor(0,0,0) {]7lh#M  
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        'Current directory of this script (should be the same as the text files being merged) *E/CNMn=E  
        Dim cDir As String ;T>.  
        cDir = MacroDir$ & "\" J$yJ2G  
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        'Array which will be populated with the list of files to be merged a{kLAx[>  
        Dim fList() As String, curFile As String ~(.&nysZ-  
        GetFileList( cDir, fList ) d}^hZ8k|  
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        Print "" qcBamf  
        Print "Files found for merging:" G8b`>@rZ  
        For Each curFile In fList [O3)s]|  
            Print Chr(9) & curFile &&sm7F%  
        Next X;dUlSi  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,e*WJh8k[  
        Dim nameArray() As String, sampName As String msZ 3%L  
        nameArray = Split(fList(0)," 0-0.txt") i6:O9Km  
        sampName  = nameArray(0) UJGmaE  
        Print "" nF{>RD  
        Print "Sample name: " & Chr(9) & sampName pt8#cU\  
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        'Open an output file and write the FRED header data iuWw(dJk  
        Dim outFile As String >s"kL^  
        outFile = cDir & sampName & "_FRED.txt" ? p^':@=  
        Open outFile For Output As #1 Y'M}lv$sa  
        Print #1, "type bsdf_data" / lN09j  
        Print #1, "format angles=deg bsdf=value scale=1" cUM#|K#6  
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        'Loop the file list, skip the two header lines and write the remaining data to file 0 +"P 1/  
        Dim lineArray() As String, curLine As Long 3|.KEJC"  
        For Each curFile In fList u"M^qRhD  
            Print "Merging data from file " & curFile ?&r >`H E  
            ReadFile( cDir & curFile, lineArray ) _JXb|FIp  
            For curLine = 2 To UBound(lineArray) S:xG:[N@  
                Print #1, lineArray(curLine) &?B\(?*  
            Next Ov8{ny  
        Next ^W<uc :L7  
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        'Close the output file K iG/XnS  
        Close #1 E 9n7P'8  
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        Print "Finished merging RPC data for sample " & sampName d#wK  
        Print "FRED formatted data file: " & Chr(9) & outFile NpF}~$2  
    End Sub Q5qQ%cu  
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    'Utility function to read the contents of a file into an array of strings. N^&T5cAC  
    Function ReadFile(ByVal fileName As String, _ y5 bELWA  
                      ByRef lineArray() As String) As Long 0qMf6  
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        ReadFile = -1 Vch!&8xii  
        Dim oFSO As Object Z  )dz  
        Set oFSO = CreateObject("Scripting.FileSystemObject") p3(&9~ s  
        Erase lineArray gEQevy`T%c  
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        Dim fid As Long ce P1mO  
        If oFSO.fileexists( fileName ) Then I@9k+JB   
            fid = FreeFile() 'HDbU#vD  
            Open fileName For Input As fid -QUvd1S40  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) {BKr/) H  
            Close fid Ws(#ThA  
        End If SgocHpyg  
        Set oFSO = Nothing Oy/+uw^  
        Return UBound( lineArray ) r)SwV!b  
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    End Function -KG3_kE  
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    Sub GetFileList( ByVal in_dir As String, _ U i ~*]  
                     ByRef in_flist() As String ) bbO1`b-  
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        'Redimension the file list array y-c2tF@'v  
        Erase in_flist 7T3ub3\  
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        'Tracks how many files are found H:HJHd"W  
        Dim fCount As Long H|iY<7@  
        fCount = 0 *m[ow s  
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        'Recurse directory and search for text files -dn\*n5  
        Dim f As String hup< U+p  
        f = Dir$(in_dir & "*.txt") 9 6'{ES9D  
        While f <> "" YSE6PG   
            ReDim Preserve in_flist(fCount) Zu/}TS9bi  
            in_flist(fCount) = f *rk!`n&  
            fCount += 1 N yK7TKui  
            f = Dir$() Q0j$u[x6s  
        Wend Q+\?gU]  
        ReDim Preserve in_flist(fCount-1) yS[Z%]bvU  
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    End Sub l;dZJ_Ut$  
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