RPC Photonics扩散片BSDF

$ @g\wz   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

(yA`h@@WS   摘要： `v?XFwnV`   x7J8z\b"O   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。 _^w&k{T   ~ES6Qw`Oe   背景： N!!=9'fGF   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。 dDYD6   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 znnnqR0us   w_qX~d/   ^%ZbjJ7|j   #0$fZ   步骤 iOY: a   " b3-'/&   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。 g?B4b7II   图2. RPC Photonics工程漫射体不同类型的散射数据 Cq8.^=}_   PtsQV !   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） _Ns/#Xe/   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 USd7gOq(   例如下所示： Gk:tT1   Sample name:  EDF-C1-56 *).u:>D4   Merging data from file EDF-C1-56 0-0.txt T,@s.v   Finished merging RPC data for sample EDF-C1-56 R&. mNji*   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt CCDU5l$$   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 sE^ee2]OI@   a. 创建一个新的散射库 $,u>,   b. 散射模型命名 @*e5(@R   c. 改变散射模型为“Tabulated BSDF”. C(CwsdlP   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） &?g!)O   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ?}g^/g !   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， QNbV=*F?   g. 点击OK ,="hI:*<   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 A |u-VXQ   )iX2r{   gcF:/@:Rm   脚本代码： r)S:-wP   tNoPpIu   '#Language "WWB-COM" "w&IO}j;=   or,:5Z   Option Explicit %(&$CmS@   dJv2tVm&'   Sub Main ~Uw; 6VXV1   >piVi[`       'Cleanup 3c%_RI.       ClearOutputWindow() H2lQ(Y+H   2OVN9_D%       Print "Merging RPC Photonics BSDF Data Files" ] *?lgwE       SetTextColor(255,0,0) @yM $Et5       Print "Note: Script should be located in the same folder as the BSDF TXT files." &NKb},~       Print "Note: Do not run this script multiple times without deleting the output file between executions." ~+ kfb^<-       SetTextColor(0,0,0)  LXoZ.3S   -w"$[XP       'Current directory of this script (should be the same as the text files being merged) !mZDukfjQ       Dim cDir As String .8wf {y       cDir = MacroDir$ & "\" sZx`u+   ZyM7)!+kPa       'Array which will be populated with the list of files to be merged 9;7Gzr6A"       Dim fList() As String, curFile As String _?>x{![       GetFileList( cDir, fList ) .(RZ&*4   [*C%u_h       Print "" KFgq3snH       Print "Files found for merging:" ''dS{nQs       For Each curFile In fList OxQ5P;O           Print Chr(9) & curFile ]"/SU6#4:       Next 1etT."   Q5c3C&$6       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. EXMW,       Dim nameArray() As String, sampName As String qjObu\r       nameArray = Split(fList(0)," 0-0.txt") STl8h}C       sampName  = nameArray(0) H#i,Ve'       Print "" Z`_x|cU?J       Print "Sample name: " & Chr(9) & sampName s"@}^ )*}   ku4Gc6f#gG       'Open an output file and write the FRED header data qt (4?_J       Dim outFile As String = r4sF!g       outFile = cDir & sampName & "_FRED.txt" +BeA4d8b       Open outFile For Output As #1 Pbd[gKX_       Print #1, "type bsdf_data" A9lw^.       Print #1, "format angles=deg bsdf=value scale=1" Wv|CJN ;4   mqHcD8X       'Loop the file list, skip the two header lines and write the remaining data to file {#st>%i       Dim lineArray() As String, curLine As Long -AD@wn!wCJ       For Each curFile In fList Zs(BViTb|           Print "Merging data from file " & curFile ^k*%`iQ           ReadFile( cDir & curFile, lineArray ) E[WU           For curLine = 2 To UBound(lineArray) OK)>QGl               Print #1, lineArray(curLine) g$ HL::           Next eL>wKu:r       Next e^em^1H( %   8 :WN@       'Close the output file vf zC2       Close #1 Nyt*mbd5 {   ^vxx]Hji       Print "Finished merging RPC data for sample " & sampName fF(AvMsO       Print "FRED formatted data file: " & Chr(9) & outFile _CPj]m{   End Sub m.rV1#AI   0$ON`Vsu|   'Utility function to read the contents of a file into an array of strings. Mq#m ;v$E   Function ReadFile(ByVal fileName As String, _ mKjTJzS                     ByRef lineArray() As String) As Long Z^]jy>dj   5kGQf       ReadFile = -1 %%|pJ%}Q>       Dim oFSO As Object =@ acg0       Set oFSO = CreateObject("Scripting.FileSystemObject") e]nP 7TIU       Erase lineArray +.&P$`;TZj   vp2w^/])u       Dim fid As Long >;XtJJS       If oFSO.fileexists( fileName ) Then }]H7uC!t           fid = FreeFile() 8!0fT}           Open fileName For Input As fid ^,YTQ.O           lineArray = Split(Input(LOF(fid), fid), vbCrLf) (u^8=#           Close fid J90:c@O"w       End If ^\g.iuE       Set oFSO = Nothing  71@kIJI       Return UBound( lineArray ) qSlo)aP   *=O]^|]2   End Function z{&Av   @Co6$<   Sub GetFileList( ByVal in_dir As String, _ F53 .g/[                    ByRef in_flist() As String )  pdm(7^   gxmo 1       'Redimension the file list array unc6 V%       Erase in_flist [<5/s$,i   w&f>VB~,1       'Tracks how many files are found  ZB|s/       Dim fCount As Long A9N8Hav       fCount = 0 4i.&geXA.   .?rs5[th*       'Recurse directory and search for text files )5n0P Zi       Dim f As String P5h *RV>oS       f = Dir$(in_dir & "*.txt") 2+I5VPf       While f <> "" Iila|,cM           ReDim Preserve in_flist(fCount) pY-!NoES           in_flist(fCount) = f BKO^ux%           fCount += 1 N<@K(?'           f = Dir$() rz,,ku4qt       Wend dl[%C6       ReDim Preserve in_flist(fCount-1)