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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 Z_Z; g]|!  
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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 0zvA>4cq)  
    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。 5gnmRd  
    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。 Jf|6 FQo&  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 m:A1wL4c6  
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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。 si|DxDx  
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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) :- Al}7  
    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 4Ev#`i3~  
    例如下所示: a1n j}1M%  
    Sample name:  EDF-C1-56 %W [#60  
    Merging data from file EDF-C1-56 0-0.txt |-SImxV  
    Finished merging RPC data for sample EDF-C1-56 _~_E(rTn  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q lg~S1D_v  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 4v("qNw#  
    a. 创建一个新的散射库 vuCl(/P`  
    b. 散射模型命名 'eRJQ*0F  
    c. 改变散射模型为“Tabulated BSDF”. <#r/4a"V  
    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 ) 0nbQKoF  
    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。 D+"-(k  
    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 YrWC\HR_  
    g. 点击OK yd-Kg zm8n  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _:Jra  
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    脚本代码 @Ht7^rz+S  
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    '#Language "WWB-COM" 2UF ,W]  
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    Option Explicit c+^#(OB  
    D'! v9}  
    Sub Main <7;AK!BH  
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        'Cleanup 7Ib/Cm0d|  
        ClearOutputWindow() 8'Y7lOXS  
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        Print "Merging RPC Photonics BSDF Data Files" *Ou)P9~-L  
        SetTextColor(255,0,0) gPu0j4&-  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." }9qbF+b  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 1JIo,7  
        SetTextColor(0,0,0) > (.V(]{3y  
    !k= ~5)x  
        'Current directory of this script (should be the same as the text files being merged) 2unaK<1s  
        Dim cDir As String W]t!I}yPR  
        cDir = MacroDir$ & "\" "&,Gn#'FG  
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        'Array which will be populated with the list of files to be merged %bp8VR sY  
        Dim fList() As String, curFile As String lOc!KZHUp  
        GetFileList( cDir, fList ) E_[)z%&n2  
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        Print "" X}/{90UD  
        Print "Files found for merging:" <r{M(yZ?@  
        For Each curFile In fList I,:R~^qJ8v  
            Print Chr(9) & curFile jv C.T]<B  
        Next EAgNu?L  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. EP|OKXRltA  
        Dim nameArray() As String, sampName As String $\DOy&e  
        nameArray = Split(fList(0)," 0-0.txt") z  DP  
        sampName  = nameArray(0) FHu -';  
        Print "" Ev R6^n/  
        Print "Sample name: " & Chr(9) & sampName l|O)B #  
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        'Open an output file and write the FRED header data :UyNa0$l:"  
        Dim outFile As String 0M'[|ci d|  
        outFile = cDir & sampName & "_FRED.txt" L6xLD X7y  
        Open outFile For Output As #1 XYOPX>$T  
        Print #1, "type bsdf_data" ]7d~,<3R  
        Print #1, "format angles=deg bsdf=value scale=1" #s!q(Rc  
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        'Loop the file list, skip the two header lines and write the remaining data to file "K"]/3`k-  
        Dim lineArray() As String, curLine As Long /lC&'hT  
        For Each curFile In fList Zw)*+> +FV  
            Print "Merging data from file " & curFile 4rmSo^vK  
            ReadFile( cDir & curFile, lineArray ) _ 2WG6y;  
            For curLine = 2 To UBound(lineArray) P?y3YxS  
                Print #1, lineArray(curLine) TJB) ]d<  
            Next RW!_Zz Z  
        Next gm-I)z!tz  
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        'Close the output file x}`]9XQ  
        Close #1 .)7r /1o  
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        Print "Finished merging RPC data for sample " & sampName 2f%G`4/p  
        Print "FRED formatted data file: " & Chr(9) & outFile g"60{  
    End Sub T4OH,^J  
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    'Utility function to read the contents of a file into an array of strings. jL|y4  
    Function ReadFile(ByVal fileName As String, _ H9x,C/r,  
                      ByRef lineArray() As String) As Long N34.Bt  
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        ReadFile = -1 D*>EWlZ   
        Dim oFSO As Object Q Eh_2  
        Set oFSO = CreateObject("Scripting.FileSystemObject") \WDL?(G<  
        Erase lineArray yU-^w^4  
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        Dim fid As Long m#D+Yh/y{n  
        If oFSO.fileexists( fileName ) Then d,Fj|}S  
            fid = FreeFile() 'THcO*<  
            Open fileName For Input As fid ,_JhvPWR,)  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1N `1~y  
            Close fid JQ>GKu~  
        End If JJ50(h)U  
        Set oFSO = Nothing )YDuq(g&  
        Return UBound( lineArray ) PY4RwN  
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    End Function !n=?H1@  
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    Sub GetFileList( ByVal in_dir As String, _ P%#EH2J  
                     ByRef in_flist() As String ) "Ih>>|r  
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        'Redimension the file list array U{IY F{;@  
        Erase in_flist &B^zu+J  
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        'Tracks how many files are found Q^&oXM'x/i  
        Dim fCount As Long ~*3obZ2>2  
        fCount = 0 }~?B>vZS  
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        'Recurse directory and search for text files uhyw?#f  
        Dim f As String 4(VVEe  
        f = Dir$(in_dir & "*.txt") h>'9-j6B  
        While f <> "" u|!On  
            ReDim Preserve in_flist(fCount) di@4'$5#  
            in_flist(fCount) = f 1]yOC)u"i  
            fCount += 1 9`"o,wGX3  
            f = Dir$() |H:JwxH  
        Wend SIJ:[=5!7  
        ReDim Preserve in_flist(fCount-1) =!axQ[)A  
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    End Sub l7 +#gPA  
     
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