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摘要: v!WkPvU s2kom) 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。 NK!#K>AO Ha41Wn'tZ 背景: `:*O8h~i^8 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。 ;!:@3c 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。 0
zn }l6OS 图1. RPC Photonics工程漫射体结构及光束投射形状 8#h~J>u. \Y$@$) i5 ;_ 步骤 CFW#+U#U g;-6Hg' 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。 qA>C<NL \N a 图2. RPC Photonics工程漫射体不同类型的散射数据 *-,jIaL; 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) lU8X{SV! 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 FCIA8^}s 例如下所示: njGZ#{"eC Sample name: EDF-C1-56 L)QAI5o:3 Merging data from file EDF-C1-56 0-0.txt LB\+*P6QM Finished merging RPC data for sample EDF-C1-56 AYHefAF<w FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt q Oyo+hu 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Wagb|B\ a. 创建一个新的散射库 Mh"vH0\Lj b. 散射模型命名 )\m%&EXG{ c. 改变散射模型为“Tabulated BSDF”. bFB.hkTP 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 ) YF$nL( e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 j}aU*p~N f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, \H{UJ g. 点击OK #McX 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X*<
!_3 Lgrpy 7OdJ&Gzd 脚本代码: B#, TdP]/ *T-v^ndJh '#Language "WWB-COM" p"|0PlW /L;
c -^ Option Explicit w\%AR1,rs M d.^r5r Sub Main %'&_Po\ J|@kF!6 'Cleanup +z O.|`+ ClearOutputWindow() V7)<MY %ou@Y` Print "Merging RPC Photonics BSDF Data Files" ppR;v SetTextColor(255,0,0) LB/1To Print "Note: Script should be located in the same folder as the BSDF TXT files." ?X nKKw\ Print "Note: Do not run this script multiple times without deleting the output file between executions." RCY}JH>} SetTextColor(0,0,0) 19*D*dkBR k~=W1R% 'Current directory of this script (should be the same as the text files being merged) i/j eb*d0 Dim cDir As String 6g 5Lf) yG cDir = MacroDir$ & "\" eeCrHt4; c^8csQ fG 'Array which will be populated with the list of files to be merged :$^cY>o Dim fList() As String, curFile As String CH] +S>$ GetFileList( cDir, fList ) 2yPF'Q7u_. SGUZ'} Print "" LDYk\[81 Print "Files found for merging:" =@s {H + For Each curFile In fList IP+.L]S Print Chr(9) & curFile Z3N^)j8 Next ;6tGRh$b |`Q2K9'4bL 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. I`S?2i2H Dim nameArray() As String, sampName As String , A;wLI nameArray = Split(fList(0)," 0-0.txt") [_1K1i"m sampName = nameArray(0) Z>_F:1x Print "" eK =v<X Print "Sample name: " & Chr(9) & sampName ;{Tf:j'g nD}CQ_C 'Open an output file and write the FRED header data lJ(];/% Dim outFile As String 2<TpNGXM_ outFile = cDir & sampName & "_FRED.txt" `8b4P>';O' Open outFile For Output As #1 p{w:^l( Print #1, "type bsdf_data" nrJW.F]S8[ Print #1, "format angles=deg bsdf=value scale=1" 9e0t #iAw/a0& 'Loop the file list, skip the two header lines and write the remaining data to file :0vKt 6>Sp Dim lineArray() As String, curLine As Long F+285JK For Each curFile In fList _g%h:G&^ Print "Merging data from file " & curFile r@ v&~pL ReadFile( cDir & curFile, lineArray ) w~Jy,[@n For curLine = 2 To UBound(lineArray) qqr]S^WW Print #1, lineArray(curLine) KpfQ=~' Next sO0j!;N Next 04@?Jb1 * cOb,Md 'Close the output file 905Lk>rB Close #1 >/9on. Ht&%`\9s Print "Finished merging RPC data for sample " & sampName :z a:gs0 Print "FRED formatted data file: " & Chr(9) & outFile ;]Ko7M(4 End Sub 9 $Ud\ (laVmU?I7 'Utility function to read the contents of a file into an array of strings. \>)#cEX5 Function ReadFile(ByVal fileName As String, _ `l}+BI`4 ByRef lineArray() As String) As Long {7d\du&G (x/xqDpmBS ReadFile = -1 /tu\q Dim oFSO As Object cnR18NK Set oFSO = CreateObject("Scripting.FileSystemObject") lJdwbuB6 Erase lineArray ^8{:RiN6e~ ;Ff5ooL{ Dim fid As Long qTrb)95 If oFSO.fileexists( fileName ) Then -"/l)1ox, fid = FreeFile() qExmf%q:q Open fileName For Input As fid `Uy4> ? lineArray = Split(Input(LOF(fid), fid), vbCrLf) DH'0# Close fid '<% ;Nv End If 7cly{U" Set oFSO = Nothing `m=u2kxY Return UBound( lineArray ) /4Jm]" X$9
"dL End Function H@V+Q} R d>PE=u Sub GetFileList( ByVal in_dir As String, _ ibv.M= ByRef in_flist() As String ) ILMXWw d>}R3T 'Redimension the file list array %TS8 9/ Erase in_flist K&UTs$_cI mH5[(? 'Tracks how many files are found @Xl/<S& Dim fCount As Long B'~CFj0W%= fCount = 0 ?b3({P }TsND6Ws3 'Recurse directory and search for text files X'.*I]) Dim f As String AlhPT ( f = Dir$(in_dir & "*.txt") 2pV@CT While f <> "" `;v>fTcy ReDim Preserve in_flist(fCount) DY?;Z98P? in_flist(fCount) = f
hp!. P1b fCount += 1 -|YDKcL f = Dir$() ;ep@
)Y Wend y)0wM~E;2 ReDim Preserve in_flist(fCount-1) g"|Z1iy|9 Oj0,Urs7 End Sub !1fAW!8 CT#u+]T jb0LMl}/A QQ:2987619807 JmJNq$2#c
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