RPC Photonics扩散片BSDF

x`6MAZ   RPC Photonics扩散片BSDF

时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印

&bTCTDZh   摘要：  +n1!xv]   J2O,wb)U   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。 V60L\?a   :9&c%~7B9   背景： _H$Lu4b)N   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。 mSYjc)z   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。 图1. RPC Photonics工程漫射体结构及光束投射形状 .fWy\r0   'z} t= ?   !Fl'?Kz   :jTSOd[r   步骤 ;yNc7Vl   3Gs\Q{O:   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。 $>)0t@[f   图2. RPC Photonics工程漫射体不同类型的散射数据 '!m6^*m|c   1T|f<ChIF<   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） v,")XPY   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 217G[YE-   例如下所示： \HGf!zZ   Sample name:  EDF-C1-56 4 OPY   Merging data from file EDF-C1-56 0-0.txt Q}#Je.;   Finished merging RPC data for sample EDF-C1-56 #-yCR   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt P~ObxY|   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 sq$v6x sl   a. 创建一个新的散射库 ;21D^e   b. 散射模型命名 g Wtc3   c. 改变散射模型为“Tabulated BSDF”. 3d}v?q78   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 ） UF"%FF   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。 FL{Uz+Q   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， #eW T-m   g. 点击OK iil<zEic   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 hYoUZ'4   ]-gyXE1.r   wnS,Jl   脚本代码： ;UQza ]i   =:rg1wo"c   '#Language "WWB-COM" &ijz'Sg3   HzTmNm)   Option Explicit N{%7O G   wI@87&   Sub Main =|oi0   3U<m\A1       'Cleanup =RB {.%       ClearOutputWindow() J?O0ixU   4l 67B]o       Print "Merging RPC Photonics BSDF Data Files" P%2v(       SetTextColor(255,0,0) TIGtX]`       Print "Note: Script should be located in the same folder as the BSDF TXT files." zud_BOq{f       Print "Note: Do not run this script multiple times without deleting the output file between executions." S;4:`?s=i       SetTextColor(0,0,0) (=j;rfvP   }$_@yt<{W@       'Current directory of this script (should be the same as the text files being merged) ofB:7       Dim cDir As String ,@ '^3u       cDir = MacroDir$ & "\" 9n R\7!_   [xqV`(vM       'Array which will be populated with the list of files to be merged ZJ3g,dc       Dim fList() As String, curFile As String A-!e$yz>       GetFileList( cDir, fList ) '|[!I!WB`   #8Bh5L!SJ1       Print "" ~nA k-toJ       Print "Files found for merging:" Sgi`&;PF       For Each curFile In fList n3iiW\           Print Chr(9) & curFile @j\:K<sk       Next `w!XO$"]Z   p}^G#h{       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. D0Q9A]bD;       Dim nameArray() As String, sampName As String ^8 VW$}       nameArray = Split(fList(0)," 0-0.txt") ,iV%{*p]       sampName  = nameArray(0) ?~o` mg       Print "" yXU.PSG*       Print "Sample name: " & Chr(9) & sampName *qzdt^[ xo   3-/|G-4k7       'Open an output file and write the FRED header data x*1wsA       Dim outFile As String VM$n|[C~       outFile = cDir & sampName & "_FRED.txt" t'U=K>7       Open outFile For Output As #1 kyHli~Nr"       Print #1, "type bsdf_data" ji?Hw       Print #1, "format angles=deg bsdf=value scale=1" qHk{5O3   9tHK_),9       'Loop the file list, skip the two header lines and write the remaining data to file PK+sGV       Dim lineArray() As String, curLine As Long RBQ8+^       For Each curFile In fList 6=f)3!=           Print "Merging data from file " & curFile ?oYO !           ReadFile( cDir & curFile, lineArray ) S>oEk3zlw           For curLine = 2 To UBound(lineArray) Qj^Uz+b               Print #1, lineArray(curLine) Ro<779.Gn\           Next Bt<)1_       Next J K2{9#*   SW9 C 8Q       'Close the output file CzBYH       Close #1 9'*7 (j;   g}W`LIasv       Print "Finished merging RPC data for sample " & sampName u IXA{89       Print "FRED formatted data file: " & Chr(9) & outFile :SaZhY   End Sub b<tV>d"Fv   j:%,lcF   'Utility function to read the contents of a file into an array of strings. &GLDoLk6[   Function ReadFile(ByVal fileName As String, _ k{2Gq1S{                     ByRef lineArray() As String) As Long *H/>96   vm@V5oH       ReadFile = -1 <1*kXTN(       Dim oFSO As Object E^)FnXe5       Set oFSO = CreateObject("Scripting.FileSystemObject") boojq{cvYA       Erase lineArray 4v_Ac;2m&   lrE"phYk       Dim fid As Long j-9)Sijj{       If oFSO.fileexists( fileName ) Then "1,*6(;:           fid = FreeFile() ]he~KO[j<           Open fileName For Input As fid Z1,rN#p9           lineArray = Split(Input(LOF(fid), fid), vbCrLf) hNXZL>6           Close fid ZS.=GjK       End If sTd@/>S?p       Set oFSO = Nothing L-Q8iFW'       Return UBound( lineArray ) ?-j/X6(\(   tl_ 3 %$s   End Function 7{<v$g$   5'set?   Sub GetFileList( ByVal in_dir As String, _ myj/93p}`b                    ByRef in_flist() As String ) y7+@  v'   |Z>-<]p9g       'Redimension the file list array kEh\@x[       Erase in_flist Y*BmBRN   & h/r]KrZ       'Tracks how many files are found ddgDq0N1j       Dim fCount As Long |YLja87       fCount = 0 My>q%lF=fw   48-j       'Recurse directory and search for text files ;87PP7~       Dim f As String x{;{fMN1       f = Dir$(in_dir & "*.txt") 7I ~O|Mw       While f <> "" B=OzP+           ReDim Preserve in_flist(fCount) }-tJ.3Zw           in_flist(fCount) = f -1dD~S$           fCount += 1 /%cDX:7X           f = Dir$() bhD-;Y!6;       Wend Gbhw7 (&       ReDim Preserve in_flist(fCount-1)