RPC Photonics扩散片BSDF

g%Z;rDfi   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

,FTF@h-Cs   摘要： tFGLqR%/   qRUz;M4   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。 ,=mn*   D526X0   背景： dCHU* 7DS   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。 3laSPih[.   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 Gqs8$[o   |y]#-T?)t   6ugBbP +^   R\<^A~(Gl   步骤 Z5+0?X0i   = *sP, 6   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。 I=1tf;Bsi   图2. RPC Photonics工程漫射体不同类型的散射数据 Rzb] mM   o5)U3U1|   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） e0D;]   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 S\C    例如下所示： Q/< $ (Y   Sample name:  EDF-C1-56 AIE)q]'Q   Merging data from file EDF-C1-56 0-0.txt A81kb   Finished merging RPC data for sample EDF-C1-56 X\h]N   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,xGlWH wrY   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 4[6A~iC_   a. 创建一个新的散射库 cD{[rI E3   b. 散射模型命名 $tb$gO   c. 改变散射模型为“Tabulated BSDF”. TPkm~>zD.   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 ） IlwY5iL   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。 X1+Wb9P   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， 3&}wfK]X   g. 点击OK 7_JK2   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 X}^,g   RY*6TYX!   KB-7]H   脚本代码： D3I;5m`_   2lGq6Au:   '#Language "WWB-COM" JK_sl>v.7   bzZEwMc6   Option Explicit Jk`A}   aeSXHd?+(   Sub Main N?~K9jGx(   fx9c1h9s       'Cleanup W1Ht8uYG3       ClearOutputWindow() ~_R=2t{u_   }lWEbQ)(!       Print "Merging RPC Photonics BSDF Data Files" JeiW z1t       SetTextColor(255,0,0) `/#6k>       Print "Note: Script should be located in the same folder as the BSDF TXT files." ')go/y`YK       Print "Note: Do not run this script multiple times without deleting the output file between executions." ,cpPXcz?,       SetTextColor(0,0,0) YncY_Hu   lGs fs(       'Current directory of this script (should be the same as the text files being merged) }4+S_b       Dim cDir As String rNZN}g       cDir = MacroDir$ & "\" P_w+p"@m   *!Xhy87%Z)       'Array which will be populated with the list of files to be merged ]F-{)j       Dim fList() As String, curFile As String n-p|7N       GetFileList( cDir, fList ) r]2}S=[   lB,.TK       Print "" M,6m*       Print "Files found for merging:" P E.^!j        For Each curFile In fList VTD'D+t           Print Chr(9) & curFile ca-|G'q       Next 2TY|)ltsF   (0^u       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {V8v       Dim nameArray() As String, sampName As String kIM* K%L}       nameArray = Split(fList(0)," 0-0.txt") =eYrz@,       sampName  = nameArray(0) GYCc)Guc       Print "" Z5\u9E"]       Print "Sample name: " & Chr(9) & sampName '%kk&&3'   v2dCna\       'Open an output file and write the FRED header data d&t|Y:,8       Dim outFile As String A"p7N?|%       outFile = cDir & sampName & "_FRED.txt" r\a9<nZ{       Open outFile For Output As #1 ]M>mwnt+       Print #1, "type bsdf_data" k_$w+Q       Print #1, "format angles=deg bsdf=value scale=1" vxK}f*d   7 zK%CJ       'Loop the file list, skip the two header lines and write the remaining data to file Q+gQ"l,95       Dim lineArray() As String, curLine As Long 'Aai.PE:       For Each curFile In fList T[L           Print "Merging data from file " & curFile W~FcU+a           ReadFile( cDir & curFile, lineArray ) b?qtTce           For curLine = 2 To UBound(lineArray) d+Pfi)+(I               Print #1, lineArray(curLine) ABB4(_3E           Next r6QNs1f~.       Next ho;Km   ?< mSEgvu       'Close the output file 3\G&fb|?}R       Close #1 @~xNax&^   (Z;-u+ }.       Print "Finished merging RPC data for sample " & sampName 5q}680s9+       Print "FRED formatted data file: " & Chr(9) & outFile 1]m]b4]   End Sub 6O!&!   #8QQZdC8`   'Utility function to read the contents of a file into an array of strings. RT4ns+J1   Function ReadFile(ByVal fileName As String, _ f_7a) 'V4                     ByRef lineArray() As String) As Long v|"Nx42   5L%A5C&|       ReadFile = -1 +m]$P,yMt       Dim oFSO As Object +t})tDPXw       Set oFSO = CreateObject("Scripting.FileSystemObject") *dL!)+:d       Erase lineArray AMGb6enl   A#\NVN8sk       Dim fid As Long `c ^2       If oFSO.fileexists( fileName ) Then wZ5+ H%x           fid = FreeFile() #B_ ``XV           Open fileName For Input As fid =i4Ds           lineArray = Split(Input(LOF(fid), fid), vbCrLf) %70sS].@           Close fid Szsq|T       End If oyiEOC       Set oFSO = Nothing Re0ma%~LP       Return UBound( lineArray ) swntz   C2<!.l   End Function 0jF~cV   D4?5%s   Sub GetFileList( ByVal in_dir As String, _ oDXUa5x                    ByRef in_flist() As String ) T&   _p"nR       'Redimension the file list array 7aj|-gZ       Erase in_flist 9#IKb:9k   Y.$'<1       'Tracks how many files are found pdX%TrM+[:       Dim fCount As Long nb9qVuAGU       fCount = 0 |$`)d87,   VPx"l5\       'Recurse directory and search for text files _=Ed>2M)no       Dim f As String : " 9F.U       f = Dir$(in_dir & "*.txt") W9D]s~bO;       While f <> "" 6hv4D`d;o           ReDim Preserve in_flist(fCount) o$8v8="p           in_flist(fCount) = f C0|<+3uND=           fCount += 1 tIR"y:U+           f = Dir$() 5*l~7R       Wend 7aUk?Hf       ReDim Preserve in_flist(fCount-1)