RPC Photonics扩散片BSDF

3>5gh8!-   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

j^Qk\(^#IV   摘要： R/B/|x   7"eIZ   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。 kSJ;kz,_   8%; .H-   背景： dqU)(T=C   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。 U/HF6=Wot   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 pi;fu   1*#hIuoj'   Vl(id_~_   nJgN2Z   步骤 '&|%^9O/"   Rc@lGq9   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。 L`:V]p   图2. RPC Photonics工程漫射体不同类型的散射数据 o{2B^@+Vb   :[PA.Upi   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） HWL? d oM   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 K^/.v<w   例如下所示： 2c,w 4rK   Sample name:  EDF-C1-56 P$O@G$n   Merging data from file EDF-C1-56 0-0.txt MD0d   Finished merging RPC data for sample EDF-C1-56 bLggh]Fh   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ~T._v;IT   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 iF:NDqc   a. 创建一个新的散射库 E9.1~ )   b. 散射模型命名 PJKxh%J   c. 改变散射模型为“Tabulated BSDF”. 0|\JbM   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 ） sBxCi~   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。 C3<_0eI   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， O"[#g   g. 点击OK H]dN'c-   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 je:J`4k$   Py9:(fdS   $0M7P5]N*G   脚本代码： tQ Mz1$   *MWI`=c   '#Language "WWB-COM" T z(Dhb,   ] VN1Y)   Option Explicit $reQdN=~   TYxi&;w   Sub Main N9H qFp   t/]za4w/       'Cleanup nrTCq~LO(       ClearOutputWindow() +b dnTV6   ~4S6c=:       Print "Merging RPC Photonics BSDF Data Files" 5B{Eg?       SetTextColor(255,0,0) xLbF9ASim       Print "Note: Script should be located in the same folder as the BSDF TXT files." AUU(fy#<       Print "Note: Do not run this script multiple times without deleting the output file between executions." %CrpUx       SetTextColor(0,0,0) _2})URU<S   Pi[(xD8       'Current directory of this script (should be the same as the text files being merged) kgX"I ?>d       Dim cDir As String :r_/mzR#       cDir = MacroDir$ & "\" [}l 1`>   0w$1Yx~C       'Array which will be populated with the list of files to be merged *u34~v16,       Dim fList() As String, curFile As String k~1{|HxrE       GetFileList( cDir, fList ) i?F~]8   m`,h nDp       Print "" xAf?E%_pi       Print "Files found for merging:" ;p(Doy)i       For Each curFile In fList i+Xb3+R           Print Chr(9) & curFile _lOyT$DN       Next {f>e~o   Eo{js?1G_       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. WZ@$bf}f0       Dim nameArray() As String, sampName As String n*qn8Dq       nameArray = Split(fList(0)," 0-0.txt") G7HvA46       sampName  = nameArray(0) 38RyUHL=       Print "" XCO;t_%       Print "Sample name: " & Chr(9) & sampName VC NQ}h[D   74~%4       'Open an output file and write the FRED header data ,Ct1)%        Dim outFile As String wIQt f|ZI>       outFile = cDir & sampName & "_FRED.txt" .ffb*gZ4       Open outFile For Output As #1 PkdL] !:       Print #1, "type bsdf_data" W' C~{}c=       Print #1, "format angles=deg bsdf=value scale=1" <(o) * Zmo   0 !F!Y_       'Loop the file list, skip the two header lines and write the remaining data to file 9C1\?)"D^e       Dim lineArray() As String, curLine As Long S?(/~Vb%       For Each curFile In fList H[iR8<rhQ           Print "Merging data from file " & curFile !o`h*G-x           ReadFile( cDir & curFile, lineArray ) k`,>52           For curLine = 2 To UBound(lineArray) NFb<fD[C               Print #1, lineArray(curLine) I6 Q{ Axy           Next &o)eRcwH`       Next Y X{F$ BM   09HqiROw       'Close the output file ~$ "P\iJ       Close #1 bX&=*L+h6   1:q5h*       Print "Finished merging RPC data for sample " & sampName 7brC@+ZD       Print "FRED formatted data file: " & Chr(9) & outFile (, uW-   End Sub n]WVT@   nTPq|=C   'Utility function to read the contents of a file into an array of strings. s\ YHT.O?   Function ReadFile(ByVal fileName As String, _ iXuSFman                     ByRef lineArray() As String) As Long Fpy-?U   ;[[oZ       ReadFile = -1 agPTY{;       Dim oFSO As Object 4Y}{?]>pu       Set oFSO = CreateObject("Scripting.FileSystemObject") 4#wZ#}       Erase lineArray  i(n BXV{   B["C~aF       Dim fid As Long ]9NA3U7F       If oFSO.fileexists( fileName ) Then kTs.ps8ei           fid = FreeFile() &^^V*O           Open fileName For Input As fid :PDyc(s{           lineArray = Split(Input(LOF(fid), fid), vbCrLf) wy4}CG           Close fid J0x)NnWJ       End If 3g5 n>8-       Set oFSO = Nothing VPXUy=W       Return UBound( lineArray ) i}r|Zo   @ZGD'+zd?   End Function o",J{   ps3jw*QZ{5   Sub GetFileList( ByVal in_dir As String, _ 6Y&`mgMF'                    ByRef in_flist() As String ) Lk1e{!a   z[0B"f       'Redimension the file list array 4jdP3Q/       Erase in_flist ,ftKRq   ~-o[v-\       'Tracks how many files are found K)F6TvWv       Dim fCount As Long %*Lv       fCount = 0 x h9Os <   QL`Hb p       'Recurse directory and search for text files *t,1(Gw|7q       Dim f As String 4 oZm0       f = Dir$(in_dir & "*.txt") >K-S&Y       While f <> "" 6k*,Yei           ReDim Preserve in_flist(fCount) x3Ze\N8w           in_flist(fCount) = f d\v1R-V           fCount += 1 #8qhl           f = Dir$() )>U7+ Me       Wend |kh7F0';"       ReDim Preserve in_flist(fCount-1)