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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 =}F$r5]  
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    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 1t#|MH ?U_  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 >kDkvg1"  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 0!1cHB/c  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤  '^,|8A2  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 l?x'R("{  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) j3/K;U/SGJ  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 !XF:.|  
    例如下所示: ?T'a{ ~]R  
    Sample name:  EDF-C1-56 R^JtWjJR  
    Merging data from file EDF-C1-56 0-0.txt GVM)-Dp]  
    Finished merging RPC data for sample EDF-C1-56 z3yAb"1Hg  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !L@a;L  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 H4ancmy  
    a. 创建一个新的散射库 3lefB A7  
    b. 散射模型命名 G"*ch$:  
    c. 改变散射模型为“Tabulated BSDF”. -Vjrh/@  
    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 ) ;k,#o!>  
    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。 XILreATK@  
    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 K5\;'.9M  
    g. 点击OK 7KV0g1GQ  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7qhX `$  
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    脚本代码 c7 O$< F  
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    '#Language "WWB-COM" a]?o"{{+  
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    Option Explicit KhNO xMZ  
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    Sub Main F{ sPQf'  
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        'Cleanup @kB^~Wf  
        ClearOutputWindow() vC-5_pl  
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        Print "Merging RPC Photonics BSDF Data Files" T^ RYN  
        SetTextColor(255,0,0) Z!oq2,ia  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." G@1T!`  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ]4)$dQ59  
        SetTextColor(0,0,0) kaNK@a=e|/  
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        'Current directory of this script (should be the same as the text files being merged) 4cJka~  
        Dim cDir As String <U2Un 0T  
        cDir = MacroDir$ & "\" /"7_75 t  
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        'Array which will be populated with the list of files to be merged w72\'  
        Dim fList() As String, curFile As String ^:^8M4:  
        GetFileList( cDir, fList ) #PA 9bM  
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        Print "" >VB*Xt\C&  
        Print "Files found for merging:" UO_tJN#X  
        For Each curFile In fList n~?n+\.&a  
            Print Chr(9) & curFile ~)]R  
        Next &&`-A6`p  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v|;}}ol  
        Dim nameArray() As String, sampName As String "uG@gV  
        nameArray = Split(fList(0)," 0-0.txt") *.A{p ;JC(  
        sampName  = nameArray(0) !)LVZfQ0  
        Print "" 'zfj`aqc  
        Print "Sample name: " & Chr(9) & sampName E6s)J -a  
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        'Open an output file and write the FRED header data j@Y'>3  
        Dim outFile As String h7o?z!  
        outFile = cDir & sampName & "_FRED.txt" nlR7V.  
        Open outFile For Output As #1 ,2Q5'!o  
        Print #1, "type bsdf_data" ;.&k zzvJ  
        Print #1, "format angles=deg bsdf=value scale=1" EOzw&M];r  
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        'Loop the file list, skip the two header lines and write the remaining data to file .dTXC'  
        Dim lineArray() As String, curLine As Long |,WP)  
        For Each curFile In fList 0E/,l``p  
            Print "Merging data from file " & curFile +`'>   
            ReadFile( cDir & curFile, lineArray ) R9)"%SO<y  
            For curLine = 2 To UBound(lineArray) i 3i  
                Print #1, lineArray(curLine) zF#:Uc`C5U  
            Next 2rG$.cGN"  
        Next tIL ]JB  
    ]r(s02  
        'Close the output file &W$s-qf".  
        Close #1 .[C@p`DZ  
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        Print "Finished merging RPC data for sample " & sampName )5/,B-+O"  
        Print "FRED formatted data file: " & Chr(9) & outFile ,HtX D~N  
    End Sub xpB* > zb  
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    'Utility function to read the contents of a file into an array of strings. _j}jh[M  
    Function ReadFile(ByVal fileName As String, _ U\x $@J  
                      ByRef lineArray() As String) As Long 9 1ndr@*|  
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        ReadFile = -1 {&0u:  
        Dim oFSO As Object W|AK"vf  
        Set oFSO = CreateObject("Scripting.FileSystemObject") *`~]XM@H  
        Erase lineArray eizni\  
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        Dim fid As Long NM0s*s42  
        If oFSO.fileexists( fileName ) Then ANq3r(  
            fid = FreeFile() IT:8k5(L5j  
            Open fileName For Input As fid kKz>]t"A  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  r74' _y  
            Close fid Fb\ E39  
        End If J)._&O$  
        Set oFSO = Nothing b&2 N7%  
        Return UBound( lineArray ) kB-]SD#  
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    End Function 57[tUO  
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    Sub GetFileList( ByVal in_dir As String, _ A#8J6xcSrL  
                     ByRef in_flist() As String ) T*jQzcm~?  
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        'Redimension the file list array yz^4TqJ  
        Erase in_flist tx,q=.(  
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        'Tracks how many files are found AS/z1M_U  
        Dim fCount As Long %Z+FX,AK  
        fCount = 0 DLD5>  
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        'Recurse directory and search for text files &.[I}KH|B  
        Dim f As String =2e{T J/  
        f = Dir$(in_dir & "*.txt") <ZjT4><  
        While f <> "" =hi{J M  
            ReDim Preserve in_flist(fCount) =buarxk  
            in_flist(fCount) = f ;.Y-e Q,  
            fCount += 1 r-$VPW  
            f = Dir$() =B0AG9Fz  
        Wend uP$C2glyz  
        ReDim Preserve in_flist(fCount-1) d9q`IZqee  
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    End Sub :pvB}RYD  
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