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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 ;pRcVL_4  
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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 Dmdy=&G  
    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$w++3H  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 <JI& {1  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 qI3NkVA'C  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 T,JA#Rk|1N  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) oYM,8 K  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 RM*f|j  
    例如下所示: v+1i= s2$  
    Sample name:  EDF-C1-56 'qv;sB.  
    Merging data from file EDF-C1-56 0-0.txt ^~ L}<]  
    Finished merging RPC data for sample EDF-C1-56 u@.>WHQN  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt XY+y}D %  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2>hz_o{5',  
    a. 创建一个新的散射库 #2%([w  
    b. 散射模型命名 keqcV23k  
    c. 改变散射模型为“Tabulated BSDF”. %c6E-4b  
    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 ) hRTMFgO  
    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。 ^abD !8  
    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 .`C V^\  
    g. 点击OK SQ#7PKH  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 C9KWa*3  
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    脚本代码 MC=G"m:_  
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    '#Language "WWB-COM" QD<eQsvV  
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    Option Explicit # .q#O C  
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    Sub Main F=&;Y@t  
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        'Cleanup ]h~o],:  
        ClearOutputWindow() 8sw,k   
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        Print "Merging RPC Photonics BSDF Data Files" wq72% e  
        SetTextColor(255,0,0) ?q%b*Ek  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." A4_>LO_qL  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." A8dI:E+$  
        SetTextColor(0,0,0) ]*ov&{'  
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        'Current directory of this script (should be the same as the text files being merged) (fXq<GXAn/  
        Dim cDir As String a c6*v49  
        cDir = MacroDir$ & "\" fS./y=j(X  
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        'Array which will be populated with the list of files to be merged 5G? .T?  
        Dim fList() As String, curFile As String 6q%ed UED  
        GetFileList( cDir, fList ) Fp:3#Bh  
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        Print "" 0>Fqx{!heq  
        Print "Files found for merging:" sx-F8:Qa  
        For Each curFile In fList BLW]|p|1:  
            Print Chr(9) & curFile .Z5[_'T  
        Next },6*Y*?{  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _0]QS4a][c  
        Dim nameArray() As String, sampName As String $Q4=37H+  
        nameArray = Split(fList(0)," 0-0.txt") BE%Z\E[[m  
        sampName  = nameArray(0) 8vJdf9pB*  
        Print "" :r39wFi  
        Print "Sample name: " & Chr(9) & sampName #{w5)|S#JD  
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        'Open an output file and write the FRED header data CZfE |T~  
        Dim outFile As String A\C'dZ <N  
        outFile = cDir & sampName & "_FRED.txt" c * 1S}us  
        Open outFile For Output As #1 AP ;*iyQ[  
        Print #1, "type bsdf_data" yjeL9:jH[  
        Print #1, "format angles=deg bsdf=value scale=1" 6J;i,/ky  
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        'Loop the file list, skip the two header lines and write the remaining data to file irmwc'n]  
        Dim lineArray() As String, curLine As Long ,TJ/3_lH  
        For Each curFile In fList 'Q`C[*c  
            Print "Merging data from file " & curFile _3U|2(E  
            ReadFile( cDir & curFile, lineArray ) ni0LQuBp  
            For curLine = 2 To UBound(lineArray) uWrFunh%  
                Print #1, lineArray(curLine) 2H>aC wfX  
            Next {jhcZ"#>\  
        Next Z~R dFC  
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        'Close the output file 1g81S_T .  
        Close #1 FpC~1Nau  
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        Print "Finished merging RPC data for sample " & sampName <O bHf`Q  
        Print "FRED formatted data file: " & Chr(9) & outFile Fd}<Uote3  
    End Sub X?kPi&ru  
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    'Utility function to read the contents of a file into an array of strings. 1:YAn  
    Function ReadFile(ByVal fileName As String, _ 'ucGt  
                      ByRef lineArray() As String) As Long 4)E|&)-fu8  
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        ReadFile = -1 1{7_ `[  
        Dim oFSO As Object F_ _H(}d  
        Set oFSO = CreateObject("Scripting.FileSystemObject") }JH`' &3  
        Erase lineArray @[0jFjK  
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        Dim fid As Long WRY~fM  
        If oFSO.fileexists( fileName ) Then gTuX *7w  
            fid = FreeFile() 6yp+h  
            Open fileName For Input As fid rBS2>?  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9yDFHz w  
            Close fid jvWI_Fto  
        End If :;<\5Oy ^  
        Set oFSO = Nothing @n>{&^-c  
        Return UBound( lineArray ) tgK x4  
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    End Function 4%%B0[Wo_O  
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    Sub GetFileList( ByVal in_dir As String, _ ~X[S<Gi#  
                     ByRef in_flist() As String ) U* 4{"  
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        'Redimension the file list array o\:$V   
        Erase in_flist 9ec0^T  
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        'Tracks how many files are found !>q?dhw@  
        Dim fCount As Long `|uoqKv  
        fCount = 0 $}V7(wu 6@  
    /!:L7@BZ  
        'Recurse directory and search for text files :mzCeX8 *  
        Dim f As String 4@= aa  
        f = Dir$(in_dir & "*.txt") 9y;y7i{>?  
        While f <> "" BQE{  
            ReDim Preserve in_flist(fCount) z( *]'Y  
            in_flist(fCount) = f M9h<}mh\  
            fCount += 1 4Fh&V{`W  
            f = Dir$() vT&j{2U7XW  
        Wend w< v1 N  
        ReDim Preserve in_flist(fCount-1) ]v<d0" 2  
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    End Sub lGl[^ 0  
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