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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 q$'&RG  
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    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 j|dzd<kE6  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 eaP$/U D?  
    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。 [4rMUS7-m"  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 6mpUk.M"  
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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。 n(S-F g  
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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) () ;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 'u/HQg*  
    例如下所示: wGX"R5  
    Sample name:  EDF-C1-56 |T&#"q,i9%  
    Merging data from file EDF-C1-56 0-0.txt %$ ?Q%  
    Finished merging RPC data for sample EDF-C1-56 1M+!cX  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt RUh{^3;~  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 u5M{s;{11r  
    a. 创建一个新的散射库 J"|$V#  
    b. 散射模型命名 %'O(Y{$Y.  
    c. 改变散射模型为“Tabulated BSDF”. |JQKxvjT  
    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 ) ) <~7<.0  
    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。 ^- Ji]5~  
    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 L$Z_j()2  
    g. 点击OK zZiVBUmE<  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 h9nCSj  
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    脚本代码 t}l<#X5  
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    '#Language "WWB-COM" _lqAxWH  
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    Option Explicit *E_= 8OV  
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    Sub Main -.{7;6:(k  
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        'Cleanup -H]O&u3'c  
        ClearOutputWindow() MWf%Lh;R  
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        Print "Merging RPC Photonics BSDF Data Files" `<G+ N  
        SetTextColor(255,0,0) UU`qI}Ys8F  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 6fyW6xv[,  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." v8N1fuP}  
        SetTextColor(0,0,0)  I9 m  
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        'Current directory of this script (should be the same as the text files being merged) VE m[F/'  
        Dim cDir As String `#F>?g$2  
        cDir = MacroDir$ & "\" tWI hbt  
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        'Array which will be populated with the list of files to be merged pUx@QyrI  
        Dim fList() As String, curFile As String 0@;E8^pa  
        GetFileList( cDir, fList ) 6m&I_icM  
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        Print "" P6rL;_~e  
        Print "Files found for merging:" tnntHQ&b  
        For Each curFile In fList }e)ltp|  
            Print Chr(9) & curFile u"ow?[E  
        Next Dl6zl6q?  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3:S"!F  
        Dim nameArray() As String, sampName As String mi?Fy0\  
        nameArray = Split(fList(0)," 0-0.txt") bfgLU.1I  
        sampName  = nameArray(0) 1>1!oml1E  
        Print "" 1'U-n{fD  
        Print "Sample name: " & Chr(9) & sampName 0)#I5tEre  
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        'Open an output file and write the FRED header data w:Vs$,  
        Dim outFile As String wqsnyP/m  
        outFile = cDir & sampName & "_FRED.txt" Y&?]t  
        Open outFile For Output As #1 ezeGw?/  
        Print #1, "type bsdf_data" S5vJC-"  
        Print #1, "format angles=deg bsdf=value scale=1" &Jz%L^  
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        'Loop the file list, skip the two header lines and write the remaining data to file JdnZY.{S0  
        Dim lineArray() As String, curLine As Long @ggM5mm  
        For Each curFile In fList [z?XVl<  
            Print "Merging data from file " & curFile q4E{?  
            ReadFile( cDir & curFile, lineArray ) <e"2<qVi  
            For curLine = 2 To UBound(lineArray) V.}U p+WL  
                Print #1, lineArray(curLine) _]NM@'e  
            Next x<].mx  
        Next 4YJs4CB  
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        'Close the output file -95 `.o  
        Close #1 /D~:Ufw  
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        Print "Finished merging RPC data for sample " & sampName w t}a`hxu  
        Print "FRED formatted data file: " & Chr(9) & outFile 4V=dD<3m  
    End Sub 3j2}n o8O  
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    'Utility function to read the contents of a file into an array of strings. G{:L^2>  
    Function ReadFile(ByVal fileName As String, _ _\"?:~rUN  
                      ByRef lineArray() As String) As Long cB TMuDT_  
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        ReadFile = -1 Q8O38uZ  
        Dim oFSO As Object 6Rso}hF}}  
        Set oFSO = CreateObject("Scripting.FileSystemObject") nHhg#wR  
        Erase lineArray rv^j&X+EH  
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        Dim fid As Long 5D'8 l@7  
        If oFSO.fileexists( fileName ) Then V9+7A  
            fid = FreeFile() y8sI @y6  
            Open fileName For Input As fid n '&WIf3  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) {It4=I)M  
            Close fid StE4n0V  
        End If }[1I_)  
        Set oFSO = Nothing P5Fm<f8\  
        Return UBound( lineArray ) 7oUYRqd  
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    End Function o] = &  
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    Sub GetFileList( ByVal in_dir As String, _ L3&NGcd  
                     ByRef in_flist() As String ) ^LZU><{';  
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        'Redimension the file list array Lz4iLLP  
        Erase in_flist \2T@]!n  
    ^ c:(HUo#  
        'Tracks how many files are found %_5B"on  
        Dim fCount As Long EF}Z+7A  
        fCount = 0 ,cS|fG  
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        'Recurse directory and search for text files RS$e^_W  
        Dim f As String @]~\H-8  
        f = Dir$(in_dir & "*.txt") D:%v((Ccw  
        While f <> "" f9!wO';P6  
            ReDim Preserve in_flist(fCount) .@R{T3 =Q  
            in_flist(fCount) = f Iu%S><'+  
            fCount += 1 (CEJg|,  
            f = Dir$() nF05p2Mh  
        Wend aRR*<dY  
        ReDim Preserve in_flist(fCount-1) CfAX,f"ZP  
    ^>[Z~G($  
    End Sub R}*e%EG/  
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