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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 Gis'IX(  
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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 ``O\'{o&  
    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。 hMDyE.X-  
    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。 i?a]v 5  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 x~(Ul\EX  
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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。 A 7sej  
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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) E O}(MXS  
    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 uIba{9tM"P  
    例如下所示: 5 )C~L]  
    Sample name:  EDF-C1-56 G{s ,Y^  
    Merging data from file EDF-C1-56 0-0.txt a`{'u)@  
    Finished merging RPC data for sample EDF-C1-56 5G2u(hx  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt =6 [!'K  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 aNwDMd^+  
    a. 创建一个新的散射库 >:K3y$]_  
    b. 散射模型命名 !O.B,  
    c. 改变散射模型为“Tabulated BSDF”. AHLDURv  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Xau.4&\d  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 lmd0Q(I  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 Oq.) 8E.  
    g. 点击OK zb3ir|  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Isi ,Tl ^  
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    脚本代码 |g9^]bT  
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    '#Language "WWB-COM" .)o5o7H  
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    Option Explicit @e slF  
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    Sub Main InDR\=o  
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        'Cleanup SY{J  
        ClearOutputWindow() fHgfI@{=j  
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        Print "Merging RPC Photonics BSDF Data Files" 7eO8cPy  
        SetTextColor(255,0,0) K}zw%!ex  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." `ybZE+S.  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 44]ae~@a  
        SetTextColor(0,0,0) |)lo<}{  
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        'Current directory of this script (should be the same as the text files being merged) [C&c;YNp  
        Dim cDir As String l==T3u r  
        cDir = MacroDir$ & "\" jVA xa|S  
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        'Array which will be populated with the list of files to be merged n1LS*-@  
        Dim fList() As String, curFile As String 4x3`dvfp/  
        GetFileList( cDir, fList ) ]f\rB8k|&  
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        Print "" 0 Hq$h  
        Print "Files found for merging:" ;P{ *'@  
        For Each curFile In fList JAn3  
            Print Chr(9) & curFile 7j]@3D9[:p  
        Next 9DT}sCLz:B  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?LW1D+  
        Dim nameArray() As String, sampName As String \ pq]q  
        nameArray = Split(fList(0)," 0-0.txt") ;CC[>  
        sampName  = nameArray(0) C2VZE~U+  
        Print "" vz _U  
        Print "Sample name: " & Chr(9) & sampName 2{%BQq>C  
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        'Open an output file and write the FRED header data UR\*KR;yM  
        Dim outFile As String +Y \#'KrA  
        outFile = cDir & sampName & "_FRED.txt" r"4:aKF>  
        Open outFile For Output As #1 ](O!6_'d  
        Print #1, "type bsdf_data" R"tLu/Sn  
        Print #1, "format angles=deg bsdf=value scale=1" $DQMN  
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        'Loop the file list, skip the two header lines and write the remaining data to file -W oZwqh  
        Dim lineArray() As String, curLine As Long 08twcY;&k  
        For Each curFile In fList 68D.Li  
            Print "Merging data from file " & curFile TN0d fba[  
            ReadFile( cDir & curFile, lineArray ) p3-sEIw}Ru  
            For curLine = 2 To UBound(lineArray) t#d~gBe?V  
                Print #1, lineArray(curLine) ul:jn]S*  
            Next uYs+x X_  
        Next *%MY. #  
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        'Close the output file m7d? SU  
        Close #1 Q2+e`  
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        Print "Finished merging RPC data for sample " & sampName DSQ2z3s2  
        Print "FRED formatted data file: " & Chr(9) & outFile 2"13!s  
    End Sub $cYh X^YG.  
    **oN/5  
    'Utility function to read the contents of a file into an array of strings. <Nkj)`%5iK  
    Function ReadFile(ByVal fileName As String, _ []'BrG)!  
                      ByRef lineArray() As String) As Long 5I@< 6S&X  
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        ReadFile = -1 @C?RbTHy  
        Dim oFSO As Object N 0`)WLW  
        Set oFSO = CreateObject("Scripting.FileSystemObject") V+DN<F-  
        Erase lineArray QKe=/;  
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        Dim fid As Long q.~_vS%  
        If oFSO.fileexists( fileName ) Then EQMn'>  
            fid = FreeFile() 8I`>tY  
            Open fileName For Input As fid L%Me wU0TZ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *ewE{$UpK  
            Close fid y&UcTE2;%(  
        End If >q "mI6F  
        Set oFSO = Nothing ]w"r4HlCx  
        Return UBound( lineArray ) ' 4ftclzL  
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    End Function >6KuZ_  
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    Sub GetFileList( ByVal in_dir As String, _ ol [   
                     ByRef in_flist() As String ) j!F5gP-l  
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        'Redimension the file list array zT 9"B  
        Erase in_flist TY"8.vd  
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        'Tracks how many files are found V9mqJRFJ:  
        Dim fCount As Long I<Wp,E9G#  
        fCount = 0 I6S!-i  
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        'Recurse directory and search for text files aJdd2,e  
        Dim f As String x-1RmL_%  
        f = Dir$(in_dir & "*.txt") P{-j ^'y  
        While f <> "" ,1&Pb %}  
            ReDim Preserve in_flist(fCount) $KHw=<:)/  
            in_flist(fCount) = f _3~/Z{z8  
            fCount += 1 /N'0@ q  
            f = Dir$() jlXzfD T  
        Wend h}0}g]IUx  
        ReDim Preserve in_flist(fCount-1) rZ'&'#Q  
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    End Sub _@2}zT  
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