RPC Photonics扩散片BSDF

`y iC=$*[   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

pUYM}&dX   摘要： aZS7sV28   A7Po 3n%Q   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。 !l@zT}i??   9+=gke   背景： U/ od~29   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。 C[sh,   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 TrS8h^C   ^teq[l$;   ~`ny@WD9   ^h' Sla   步骤 ]=pR   *ISZlR\#   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 Lh.b5Q|   图2. RPC Photonics工程漫射体不同类型的散射数据 942lSyix   4GdX/6C.   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ')Y'c   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 2_^aw[-   例如下所示： (t+;O;   Sample name:  EDF-C1-56 %EbPI)yY3   Merging data from file EDF-C1-56 0-0.txt ED>prE0   Finished merging RPC data for sample EDF-C1-56 !9Z r;K~\   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 1\*\?\T>_   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 F,BOgWwP   a. 创建一个新的散射库 <EO$]>;0   b. 散射模型命名 FY{e2~gi   c. 改变散射模型为“Tabulated BSDF”. V"\0Y0   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 ） sUJ%x#u}Fk   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。 O/s$SX%g   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， :}8Z@H!KkY   g. 点击OK afBE{   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 K.<.cJE   tGvG   }/tf>?c   脚本代码： y$FW$Ka   ULrr=5&8   '#Language "WWB-COM"  xw^R@H   (.wIe/   Option Explicit NX`*%K   ,mhQ"\ +C   Sub Main BS Iy+   @AHm!9?o       'Cleanup Unj.f>U       ClearOutputWindow() c\B|KhDk   )'17r82a       Print "Merging RPC Photonics BSDF Data Files" dI&!e#Y       SetTextColor(255,0,0) gVQjL+_W       Print "Note: Script should be located in the same folder as the BSDF TXT files." 61puqiGG^       Print "Note: Do not run this script multiple times without deleting the output file between executions." S#)Eom?V       SetTextColor(0,0,0) Y}#h5\   ?0? R       'Current directory of this script (should be the same as the text files being merged) wW>zgTG       Dim cDir As String +zXEYc       cDir = MacroDir$ & "\" (" LQll9   ]f+ csB       'Array which will be populated with the list of files to be merged m' P1BLk       Dim fList() As String, curFile As String JJ;[,       GetFileList( cDir, fList ) ~\{^%~[48   | N0Z-|       Print "" -~?J+o+Pr"       Print "Files found for merging:" hxCvk/7sT       For Each curFile In fList U2uF&6v           Print Chr(9) & curFile |D, +P       Next PH"n{lW.T   ;"(foY"L       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. XGP6L0j       Dim nameArray() As String, sampName As String q_-7i       nameArray = Split(fList(0)," 0-0.txt") X[f=h=|       sampName  = nameArray(0) 2M#r]       Print "" V&-~x^JK       Print "Sample name: " & Chr(9) & sampName w"R:\@ F   /rUo{j       'Open an output file and write the FRED header data ^G6RjJxqp8       Dim outFile As String EEGy!bff       outFile = cDir & sampName & "_FRED.txt" %f($*l.       Open outFile For Output As #1 &u#&@J       Print #1, "type bsdf_data" \[Z?&       Print #1, "format angles=deg bsdf=value scale=1" 0eK*9S]   Q}-~O1       'Loop the file list, skip the two header lines and write the remaining data to file `jwa<N4e@       Dim lineArray() As String, curLine As Long cA%%IL$R       For Each curFile In fList e{m2l2Tx:           Print "Merging data from file " & curFile &|/| ''A)           ReadFile( cDir & curFile, lineArray ) JV;OGh>           For curLine = 2 To UBound(lineArray) 76u&EG%               Print #1, lineArray(curLine) 8Y5           Next _YF%V;X       Next <=f}8a.R3   FJasS8       'Close the output file &hRv ol\J       Close #1 G "73=8d   OKoan$#sn       Print "Finished merging RPC data for sample " & sampName &^W|iXi #       Print "FRED formatted data file: " & Chr(9) & outFile ">#wOm+ +   End Sub P*cNh43U   m=YU2!Mb   'Utility function to read the contents of a file into an array of strings. `ho1nY$)CE   Function ReadFile(ByVal fileName As String, _ qh`t-                     ByRef lineArray() As String) As Long 5}`_x+$%(`   \hB5@e4i2       ReadFile = -1 TY1I=8       Dim oFSO As Object jYe'V#5S#       Set oFSO = CreateObject("Scripting.FileSystemObject") 'nF2a D%A       Erase lineArray ~R(%D-k   9/nn)soC3       Dim fid As Long \EVBwE,       If oFSO.fileexists( fileName ) Then )oyIe)           fid = FreeFile() V,$0p1?J           Open fileName For Input As fid '0FhL)x?"T           lineArray = Split(Input(LOF(fid), fid), vbCrLf) U~p V)J           Close fid 1Z9qjV%^       End If #5f-`~^C{       Set oFSO = Nothing t^w"w`v\u       Return UBound( lineArray ) '#k0a,<N   mya_4I m   End Function #FNcF>3>   &}A[x1x06)   Sub GetFileList( ByVal in_dir As String, _ )a-Du$kd                    ByRef in_flist() As String ) 92 [;Y   WVI{oso#       'Redimension the file list array NUp<e%zB       Erase in_flist L31HGH2l   7x@A%2J       'Tracks how many files are found Bro9YP4<       Dim fCount As Long \Cii1\R=       fCount = 0 >k'c'7/   l6d$V9A       'Recurse directory and search for text files .,OVzW       Dim f As String [<6S%s       f = Dir$(in_dir & "*.txt") BW"5Aj       While f <> "" Nd;Ku6           ReDim Preserve in_flist(fCount) S;)w.           in_flist(fCount) = f '#&os`mQ           fCount += 1 R;j!}D!4           f = Dir$() kOed ]>H       Wend *FMMjz       ReDim Preserve in_flist(fCount-1)