RPC Photonics扩散片BSDF

_~Id~b   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

W*;r}!ro   摘要： vC^U l   #W9{3JGUY   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。 Se}&2 R   %p;;aZG   背景： e+~@"^|   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。 `(uN_zvH   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 6c6w w"   ZHM NG~!   ]!>tP,<`'   kxCN0e#_   步骤 fnJx$PD~   GLp~SeF#   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。 .QW@rV:T   图2. RPC Photonics工程漫射体不同类型的散射数据 U ! $/'Xi9   "M3S   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） J?Bj=b   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 Hkrhd    例如下所示： 50e vWD   Sample name:  EDF-C1-56 K%.t%)A_3   Merging data from file EDF-C1-56 0-0.txt gq~K(Q<O<   Finished merging RPC data for sample EDF-C1-56 HDi_|{2^   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'YB{W8bR   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Y41b8.|P+   a. 创建一个新的散射库 *+TO%{4   b. 散射模型命名 .I Io    c. 改变散射模型为“Tabulated BSDF”. V'FKgzd   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） #AH gY.   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 1*?XI   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， {)I&&fSz   g. 点击OK fQxlYD'peb   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Tmk'rOg5   *P\OP'o_   %O9P|04]3   脚本代码： /%F5u}eW   j9/hZqo   '#Language "WWB-COM" hAJ^(|   A;TNR   Option Explicit ]u.) 6{   5Mp$u756   Sub Main TB_OFbI2   x<5;#       'Cleanup 7O~hA*Z       ClearOutputWindow() A |P wm`   4}t$Lf_       Print "Merging RPC Photonics BSDF Data Files" &hEkm       SetTextColor(255,0,0) h ^Wm03w       Print "Note: Script should be located in the same folder as the BSDF TXT files." N97WI+`       Print "Note: Do not run this script multiple times without deleting the output file between executions." Bxf&gDwjgr       SetTextColor(0,0,0) RgD:"zeM   MSb0J`       'Current directory of this script (should be the same as the text files being merged) K_Kz8qV.?       Dim cDir As String bSW~hyI w       cDir = MacroDir$ & "\" x|*m ok   /&em%/       'Array which will be populated with the list of files to be merged Z*Fn2I4       Dim fList() As String, curFile As String >CYz6G j       GetFileList( cDir, fList ) }}LjEOvL=   cS>xT cj       Print "" ybc Cq]cgt       Print "Files found for merging:" @=?#nB&       For Each curFile In fList RijFN.s           Print Chr(9) & curFile "d*- k R       Next z>HM$n`YD   c^~R%Bx       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .X"\ Mg       Dim nameArray() As String, sampName As String +hIMfhF       nameArray = Split(fList(0)," 0-0.txt") CtHsi8m       sampName  = nameArray(0) }0F u       Print "" SQ`KR'E       Print "Sample name: " & Chr(9) & sampName ([NS%   yG<Q t+D       'Open an output file and write the FRED header data )gG_K$08?       Dim outFile As String H284 ]i       outFile = cDir & sampName & "_FRED.txt" v "sN K       Open outFile For Output As #1 Sr-!-eC       Print #1, "type bsdf_data" 5ZjM:wrF|       Print #1, "format angles=deg bsdf=value scale=1" t x1(6V&l;   7Pr5`#x#       'Loop the file list, skip the two header lines and write the remaining data to file w"!zLB&9[       Dim lineArray() As String, curLine As Long K>TvM &       For Each curFile In fList tj:>o#D           Print "Merging data from file " & curFile ,Z(J;~           ReadFile( cDir & curFile, lineArray ) ~./M5P!\           For curLine = 2 To UBound(lineArray) ~t^'4"K*               Print #1, lineArray(curLine) vl5r~F           Next 9U!#Y%*T       Next `3vt.b   mk +BeK       'Close the output file B0!W=T\       Close #1 Tl*FK?)MC^   #+;0=6+SM       Print "Finished merging RPC data for sample " & sampName %M-B"#OB7       Print "FRED formatted data file: " & Chr(9) & outFile Lu~M=Fh   End Sub Gl5W4gW;&   88+J(^y>   'Utility function to read the contents of a file into an array of strings. =mh)b]].4\   Function ReadFile(ByVal fileName As String, _ !{4bC                     ByRef lineArray() As String) As Long M9wj };vy   bdr!|WZ       ReadFile = -1 8yCQWDE}       Dim oFSO As Object WQ1*)h8,9       Set oFSO = CreateObject("Scripting.FileSystemObject") {pEbi)CF,}       Erase lineArray oB zjEv   E#,n.U>#)       Dim fid As Long zbP#y~[       If oFSO.fileexists( fileName ) Then si|b>R&Z           fid = FreeFile() +7bV           Open fileName For Input As fid S)*!jI           lineArray = Split(Input(LOF(fid), fid), vbCrLf) !J+< M~o}           Close fid ~f]I0FK       End If e[J0+ x#;r       Set oFSO = Nothing b{l kl?@a       Return UBound( lineArray ) *M()z.N   G1:2MPH   End Function R6dD17   30$Q5]T   Sub GetFileList( ByVal in_dir As String, _ O$ ;:5zT                    ByRef in_flist() As String ) 2~SjRIpUw   #:M)a?E/%       'Redimension the file list array } T1~fa       Erase in_flist >-YWq   P7kb*        'Tracks how many files are found .+hM1OF`x       Dim fCount As Long Y7 `i~K;       fCount = 0 ~<w9a]   i:,37INMt       'Recurse directory and search for text files s1NRUV2E       Dim f As String -4'yC_8t       f = Dir$(in_dir & "*.txt") C!aK5rqhv       While f <> "" &d^u$Y5           ReDim Preserve in_flist(fCount) ]V gl           in_flist(fCount) = f Ga}&%           fCount += 1 '74-rL:i           f = Dir$() (3+:/,{'$       Wend *,d>(\&[f       ReDim Preserve in_flist(fCount-1)