RPC Photonics扩散片BSDF

ME$2P!o   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

4$ Dt8!p0   摘要： DX }B0B   ZV'$k\   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 ;,1=zhKU.   I|,pE**T   背景： D \N \BD   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 GE1i+.+-.   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 Z_H?WGO   }]AT _bh,   vQ:wW',i   D.'h?^kA   步骤 !FTNmyM~F   *~p(GC   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 \K}-I   图2. RPC Photonics工程漫射体不同类型的散射数据 ypx: )e"/   dj'm, k b   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） %$@1FlqX;   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 A)tP()+)   例如下所示： *LANGQ"2(i   Sample name:  EDF-C1-56 33Jd!orXU   Merging data from file EDF-C1-56 0-0.txt *?/tO, R?   Finished merging RPC data for sample EDF-C1-56 7kKuZW@K-   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4({(i   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 u*3NS$vH   a. 创建一个新的散射库 {~SaRB2<'   b. 散射模型命名 _AFQ>j   c. 改变散射模型为“Tabulated BSDF”. hoa7    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） MtS 3p>4   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 'Gx$Bj   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， + WVIZZ8   g. 点击OK ';0 qj$#   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 -(i(02PX   L*h{'<Bz   W+Xz$j/u   脚本代码： G?AG:%H%   ^Dg<Ki   '#Language "WWB-COM" <[Q3rJ   Kv37s0|g   Option Explicit +x=)/;:   hoM|P8 }rh   Sub Main &;E5[jO^D   j'?7D0>       'Cleanup  ]5Qy       ClearOutputWindow() p =(@3%k   HDVW0QaMu       Print "Merging RPC Photonics BSDF Data Files" p5\]5bb       SetTextColor(255,0,0) D}3T|N       Print "Note: Script should be located in the same folder as the BSDF TXT files." yNg9X(U       Print "Note: Do not run this script multiple times without deleting the output file between executions." izgp*M,       SetTextColor(0,0,0) j}1zdA   @I`C#~       'Current directory of this script (should be the same as the text files being merged) 3S*AxAeg       Dim cDir As String 0(U#)       cDir = MacroDir$ & "\" * \}}Bv+9   NVKC'==0       'Array which will be populated with the list of files to be merged h!rM^       Dim fList() As String, curFile As String +Hvc_Av''       GetFileList( cDir, fList ) A4C+5R   =m89z}Ot       Print "" fhPkEvJ       Print "Files found for merging:" gTl<wo +       For Each curFile In fList Fm\"{) V:b           Print Chr(9) & curFile W>_]dPBS/       Next F{06 _T   }KUd7[ s       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [x=jH>Y       Dim nameArray() As String, sampName As String :y*NM,s       nameArray = Split(fList(0)," 0-0.txt") w(ln5q       sampName  = nameArray(0) !+>v[(OzM       Print "" L86n}+ P\       Print "Sample name: " & Chr(9) & sampName 4[Z\ ?[   v+p{|X-       'Open an output file and write the FRED header data b@RHc!,>jV       Dim outFile As String O~j> ?       outFile = cDir & sampName & "_FRED.txt" Xq'cA9v=$J       Open outFile For Output As #1 KT]Pw\y5       Print #1, "type bsdf_data" bvfk       Print #1, "format angles=deg bsdf=value scale=1" 8!.ojdyn   J+rC xn?;g       'Loop the file list, skip the two header lines and write the remaining data to file COH<Tj       Dim lineArray() As String, curLine As Long (c0A.L)       For Each curFile In fList zJe#m|Z           Print "Merging data from file " & curFile YK|bXSA[           ReadFile( cDir & curFile, lineArray ) 8DP+W$           For curLine = 2 To UBound(lineArray) {U&.D [{&               Print #1, lineArray(curLine) 3u%{dGa           Next Gy=B&boZ       Next U,nEbKJgk   C9p"?vX       'Close the output file nUkaz*4qU       Close #1 !i=nSqW   Mq';S^       Print "Finished merging RPC data for sample " & sampName !w&kyW?e       Print "FRED formatted data file: " & Chr(9) & outFile f/CuE%7BR   End Sub NcY608C   !^Q.VYY   'Utility function to read the contents of a file into an array of strings. 2NB L}x   Function ReadFile(ByVal fileName As String, _ V!)O6?l                     ByRef lineArray() As String) As Long \U@rg4   YM5fyv?       ReadFile = -1 ;sHN/eF       Dim oFSO As Object EbqcV\Kb       Set oFSO = CreateObject("Scripting.FileSystemObject") 4H@Wc^K       Erase lineArray #A]-ax?Qc}   .7n\d55a       Dim fid As Long PTj&3` v       If oFSO.fileexists( fileName ) Then ETB6f           fid = FreeFile() ,m,) I           Open fileName For Input As fid z $MV%F           lineArray = Split(Input(LOF(fid), fid), vbCrLf) ne^imht           Close fid LdB($4,       End If }x&N^Ky3c       Set oFSO = Nothing ^FnfJ:       Return UBound( lineArray ) j) ,,"54*   ^Idle*+   End Function IEyL];K   }MlwC;ot   Sub GetFileList( ByVal in_dir As String, _ Ux+Q                    ByRef in_flist() As String ) nVJPR   \w'*z&`W9       'Redimension the file list array pAk/Qxl3eo       Erase in_flist mXXt'_"   Ka,^OW}<%q       'Tracks how many files are found Iuh/I +[7       Dim fCount As Long <r3J0)r }       fCount = 0 z.}[m,oTF   pa{re,O"e       'Recurse directory and search for text files 2W$cFC       Dim f As String )Jv[xY~       f = Dir$(in_dir & "*.txt") n-TQ*&h]3S       While f <> "" ^H6<Km l/V           ReDim Preserve in_flist(fCount) n!qV>k9Y           in_flist(fCount) = f `g,8-           fCount += 1 1J'3g           f = Dir$() 4npqJ1       Wend Y{*u&^0{       ReDim Preserve in_flist(fCount-1)