RPC Photonics扩散片BSDF

7';PI!$   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

XhTp'2,]   摘要： YSeXCJ:Iy   2MJ0[9   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。 J9>uLz   N{E>R&,q   背景： X $cW!a   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。 *4WOmsj   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 N?R1;|Z]   pn'*w1i   +#n[55d   2uU~$7~N   步骤 MiS$Y   iPI6 _h   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。 [UFLL:_sC   图2. RPC Photonics工程漫射体不同类型的散射数据 lE%0ifu   hOw7"'# !   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） hPhN7E03   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 ZJI|762,   例如下所示： ^[d)Hk}L   Sample name:  EDF-C1-56 qhiQ!fMQ   Merging data from file EDF-C1-56 0-0.txt :?yv0Iu   Finished merging RPC data for sample EDF-C1-56 Z7OWpujCvN   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt OTalR;:]r   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 J/ <[irC   a. 创建一个新的散射库 .4.zy]I   b. 散射模型命名 #;2Ju'e#z   c. 改变散射模型为“Tabulated BSDF”. HJoPk'p%   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 ） oIX]9~   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。 }1Q]C "hY   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， ;M\H#%G.   g. 点击OK Q %q_   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 /GfC/)1_   qnruatA   ~@TNVkw   脚本代码： |=,V,*"   Mg-Kh}U   '#Language "WWB-COM" HWD   b pExYyt   Option Explicit \jZvP`.2   zj"J~s;?   Sub Main p@>_1A}qh_   ZuILDevMD       'Cleanup d];E99}       ClearOutputWindow() #![b9~%WTh   ?$ o9/9w       Print "Merging RPC Photonics BSDF Data Files" r|6S&Ia>       SetTextColor(255,0,0) qdNYY&6>?u       Print "Note: Script should be located in the same folder as the BSDF TXT files." vsHY;[       Print "Note: Do not run this script multiple times without deleting the output file between executions." )!){4c/       SetTextColor(0,0,0) IP/ zFbc   j<wWPv       'Current directory of this script (should be the same as the text files being merged) cm]8m_!       Dim cDir As String pH'#v]"       cDir = MacroDir$ & "\" h#'(UZ   q_']i6       'Array which will be populated with the list of files to be merged fqFE GyeNr       Dim fList() As String, curFile As String }(O 7tC       GetFileList( cDir, fList ) :Y~fPke   Xn9TQ"[4       Print "" uFL~^vz       Print "Files found for merging:" * t{A=Wk       For Each curFile In fList >mi%L3P k           Print Chr(9) & curFile N>'1<i?       Next 95[yGO>ZYz   Vb|DNl@       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. =H3 JRRS       Dim nameArray() As String, sampName As String !+=jD3HTJ       nameArray = Split(fList(0)," 0-0.txt") fG2\p&z       sampName  = nameArray(0) 3zGxe-       Print "" Vv0dBFe       Print "Sample name: " & Chr(9) & sampName 0:Yz'k5   |:L<Ko       'Open an output file and write the FRED header data f [!N]*       Dim outFile As String d&PXJ       outFile = cDir & sampName & "_FRED.txt" i~PN(h       Open outFile For Output As #1 ?&pjP,a       Print #1, "type bsdf_data" KYu3dC'/,&       Print #1, "format angles=deg bsdf=value scale=1" I[WW1P5   p4bQCI       'Loop the file list, skip the two header lines and write the remaining data to file WojZ[j>       Dim lineArray() As String, curLine As Long K q: +{'       For Each curFile In fList +\?#8U /k           Print "Merging data from file " & curFile :|EM1-lwf           ReadFile( cDir & curFile, lineArray ) 4\Mh2z5           For curLine = 2 To UBound(lineArray) &d[&8V5S               Print #1, lineArray(curLine) C >4y<,Q           Next 6Z\[{S];       Next ~^w;`~L   S%R:GZEf_       'Close the output file )PVX)2P_C       Close #1 +8]}'6m   o{(-jhR       Print "Finished merging RPC data for sample " & sampName l5l:'EY>       Print "FRED formatted data file: " & Chr(9) & outFile JGHQ_AI   End Sub RYZh"1S;k   6~ev5SD;f   'Utility function to read the contents of a file into an array of strings. ac p-4g+j   Function ReadFile(ByVal fileName As String, _ % AF~Ki                     ByRef lineArray() As String) As Long ,3qi]fFLMe   L*6Tz'Qp       ReadFile = -1 P"cc$lB~I       Dim oFSO As Object K)`,|q* \       Set oFSO = CreateObject("Scripting.FileSystemObject") %TyR8 %       Erase lineArray S6*3."Sk   .-k\Q}D       Dim fid As Long 6-{QU] #       If oFSO.fileexists( fileName ) Then Klzsr,           fid = FreeFile() ,/BBG\mJ           Open fileName For Input As fid fpwge/w           lineArray = Split(Input(LOF(fid), fid), vbCrLf) l Ztq_* Fl           Close fid 3gQQ,V..       End If Qb!9QlW       Set oFSO = Nothing x\)0+c~\}x       Return UBound( lineArray ) 4(B{-cK   EGf9pcUEO&   End Function 8j. 9Sk/   BI?M/pIm   Sub GetFileList( ByVal in_dir As String, _ M\ BLuD                    ByRef in_flist() As String ) Nc()$Nl8   iEux`CcJ.       'Redimension the file list array we9R4*j       Erase in_flist 9He>F7J:p'   ~9#\+[ d_       'Tracks how many files are found iqig~fjK~       Dim fCount As Long sa36=:5x-       fCount = 0 <v&>&;>3   ^EdY:6NJ=A       'Recurse directory and search for text files d nWh}!       Dim f As String ^n"ve2       f = Dir$(in_dir & "*.txt") /m%i"kki       While f <> "" 3rhH0{           ReDim Preserve in_flist(fCount) \/I@&$"F           in_flist(fCount) = f Dtl381F J           fCount += 1 |_{-hNiz0           f = Dir$() g!(j.xe       Wend Gdq_T*       ReDim Preserve in_flist(fCount-1)