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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 `Jon^&^;|  
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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 OX)[?1m8  
    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。 @,v.Y6Ge  
    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(eLxw e%  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Q+'QJ7fw'|  
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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。 ojZvgF  
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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]}wZY0  
    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 G4eY}3F7,4  
    例如下所示: P mgTTI  
    Sample name:  EDF-C1-56 x*uQBNf=  
    Merging data from file EDF-C1-56 0-0.txt E%6}p++  
    Finished merging RPC data for sample EDF-C1-56 n[pW^&7x  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %$L!N-U6  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +\n8##oAI  
    a. 创建一个新的散射库 Fm3B8Int  
    b. 散射模型命名 V/}g'_E  
    c. 改变散射模型为“Tabulated BSDF”. 8P= z"y  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ]%VR Nm  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 h"{Z%XPX#  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 c31k%/.  
    g. 点击OK m.A_u7D@  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 J}cqBk>  
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    脚本代码 ki[Yu+';}  
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    '#Language "WWB-COM" Hjm  
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    Option Explicit {@c)!% 2$  
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    Sub Main QK3j.Ss  
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        'Cleanup ErNL^Se1  
        ClearOutputWindow() se1\<YHDS  
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        Print "Merging RPC Photonics BSDF Data Files" b+.P4+  
        SetTextColor(255,0,0) 8f37o/L  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." '%$)"g]/#  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 2}P?N  
        SetTextColor(0,0,0) b]X c5Dp{  
    3~7X2}qU  
        'Current directory of this script (should be the same as the text files being merged) t_PAXj  
        Dim cDir As String I8C(z1(N  
        cDir = MacroDir$ & "\" ' ?3e1  
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        'Array which will be populated with the list of files to be merged GDgq 4vfj  
        Dim fList() As String, curFile As String 8MH ZWi  
        GetFileList( cDir, fList ) {uQp$`  
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        Print "" 9K\A4F}  
        Print "Files found for merging:"   SW ^F  
        For Each curFile In fList B=mk@gX,G  
            Print Chr(9) & curFile 1I*b7t  
        Next _{fh/{b1  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. o+o'!)  
        Dim nameArray() As String, sampName As String j`GL#J[wqQ  
        nameArray = Split(fList(0)," 0-0.txt") b'Scoa7@'  
        sampName  = nameArray(0) t7"vAjZU  
        Print "" y Q_lJIX  
        Print "Sample name: " & Chr(9) & sampName lj{Jw.t  
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        'Open an output file and write the FRED header data #-wtNM%1#  
        Dim outFile As String }i7Gv K<[:  
        outFile = cDir & sampName & "_FRED.txt" FOAy'76p  
        Open outFile For Output As #1 iB  =R  
        Print #1, "type bsdf_data" &jh'B ,  
        Print #1, "format angles=deg bsdf=value scale=1" 6tC0F=  
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        'Loop the file list, skip the two header lines and write the remaining data to file ~|_s2T  
        Dim lineArray() As String, curLine As Long 66G$5  
        For Each curFile In fList UQmdm$.  
            Print "Merging data from file " & curFile aXAV`%b  
            ReadFile( cDir & curFile, lineArray ) YY\$lM  
            For curLine = 2 To UBound(lineArray) }0& @J'<  
                Print #1, lineArray(curLine) Bg"KNg  
            Next 2UPqn#.3  
        Next MCBZq\c  
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        'Close the output file 8CR b6  
        Close #1 TC7Rw}jF  
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        Print "Finished merging RPC data for sample " & sampName HzcI2 P`|  
        Print "FRED formatted data file: " & Chr(9) & outFile hmfO\gc}y  
    End Sub sEQAC9M  
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    'Utility function to read the contents of a file into an array of strings. D<-MbK^S  
    Function ReadFile(ByVal fileName As String, _ a^U)2{A*f  
                      ByRef lineArray() As String) As Long ?Vy% <f$  
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        ReadFile = -1 8T&.8r  
        Dim oFSO As Object MGt[zLF9  
        Set oFSO = CreateObject("Scripting.FileSystemObject") S?ypka"L  
        Erase lineArray oa4{s&db-  
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        Dim fid As Long nH6Ny  
        If oFSO.fileexists( fileName ) Then :qfP>Ok  
            fid = FreeFile() ak :Y<}  
            Open fileName For Input As fid JDTlzu1hR  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) %XX(x'^4  
            Close fid kj$Ks2!W  
        End If T1\LS*~!  
        Set oFSO = Nothing #le1 ^ <w7  
        Return UBound( lineArray ) tZW2TUM]  
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    End Function :gD=F&V  
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    Sub GetFileList( ByVal in_dir As String, _ /$w,8pV =  
                     ByRef in_flist() As String ) yK1@`3@?  
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        'Redimension the file list array 4=BIYC"Lu  
        Erase in_flist PV[ Bqt  
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        'Tracks how many files are found _>b=f  
        Dim fCount As Long d`}t!]Gg  
        fCount = 0 iJ&*H)}^  
    Aoi) 11>  
        'Recurse directory and search for text files <_o).hE{  
        Dim f As String 'AU:[eyUV  
        f = Dir$(in_dir & "*.txt") /0.m|Th'm  
        While f <> "" $,@PY5r  
            ReDim Preserve in_flist(fCount) DJ zJ$Q  
            in_flist(fCount) = f l2Gtw*i_I  
            fCount += 1 YadG05PDe  
            f = Dir$() k H.e"e  
        Wend (_9u<  
        ReDim Preserve in_flist(fCount-1) ^k* h  
    -:$#koW  
    End Sub 9;ZaL7>  
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