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摘要: {CVZ7tU7] wnLpf 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。 (R RRG;*n# $`t2SD 背景: Dsv2p~ Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 #,})N*7 FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ^r7KEeVD 图1. RPC Photonics工程漫射体结构及光束投射形状 JPj/+f q$}J/w(, {c drMP@"" 步骤 =i7CF3 QAY:H@Gt: 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。 wXBd"]G)C &fkH\o7) 图2. RPC Photonics工程漫射体不同类型的散射数据 JPgFTr 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) ,MHF 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 uz=9L<$ 例如下所示: $!z .[GL Sample name: EDF-C1-56 {%,4P_m Merging data from file EDF-C1-56 0-0.txt Jiru~Vo+ Finished merging RPC data for sample EDF-C1-56 @KZW*-" FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt >:FmAey 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N"~P$B1X a. 创建一个新的散射库 ^d(gC%+!u b. 散射模型命名 Bw[IW[(~! c. 改变散射模型为“Tabulated BSDF”. pB%oFWqK 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 ) j^f54Ky. 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。 37M,Os1( 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, !I91kJt7 g. 点击OK 8Vt'X2 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 RgM=g8}M u'Hh||La" g^i\7' 脚本代码: 5pHv5e iT{[zLz>1 '#Language "WWB-COM" g(Oor6Pp b 1."mT!p Option Explicit ~=otdJ
X]GodqL\ Sub Main X?`mYoe wp:Zur5Y 'Cleanup Z
6][9o ClearOutputWindow() v`6vc)>8 OsYZa`$, Print "Merging RPC Photonics BSDF Data Files" 2IkyC` SetTextColor(255,0,0) &{q'$oF Print "Note: Script should be located in the same folder as the BSDF TXT files." yaHkWkl
= Print "Note: Do not run this script multiple times without deleting the output file between executions." '?X?'_3 SetTextColor(0,0,0) 8N<mV^|} sdgI , 'Current directory of this script (should be the same as the text files being merged) }R hSt] Dim cDir As String Sj8fo^K50 cDir = MacroDir$ & "\" C 8d9(u jpMMnEVj6P 'Array which will be populated with the list of files to be merged d9T:0A`M Dim fList() As String, curFile As String RyWfoLc GetFileList( cDir, fList ) k6\&[BQs 7|!Zx-} Print "" w2r*$Q Print "Files found for merging:" 3rLc\rK For Each curFile In fList <0jM07\< Print Chr(9) & curFile OO,%zwgt Next |H5$VSw yv)-QIC3 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 'P%&*% Dim nameArray() As String, sampName As String vrvi]
Y8 nameArray = Split(fList(0)," 0-0.txt") 0p\Kf(|E*6 sampName = nameArray(0) m YhDi Print "" ?]TtUoY=)F Print "Sample name: " & Chr(9) & sampName p DU+(A4> lr
-+|>M) 'Open an output file and write the FRED header data !!~r1)zN Dim outFile As String hN!{/Gc| outFile = cDir & sampName & "_FRED.txt" WO^]bR Open outFile For Output As #1 J*^ i=y Print #1, "type bsdf_data" P(LiH Print #1, "format angles=deg bsdf=value scale=1" I3}I7oc_ dzV2; 'Loop the file list, skip the two header lines and write the remaining data to file FJW,G20L Dim lineArray() As String, curLine As Long )E6E} For Each curFile In fList KHeeB `V>J Print "Merging data from file " & curFile 1ZvXRJ)% ReadFile( cDir & curFile, lineArray ) O}6*9Xy For curLine = 2 To UBound(lineArray) "!D,9AkZS Print #1, lineArray(curLine) /\E3p6\* Next #X?E#^6?E Next > aCY LftGA7uGJ) 'Close the output file
-"bC[ WN Close #1 jgfr_"@A ;g<y{o"Q3p Print "Finished merging RPC data for sample " & sampName ^r{N^ Print "FRED formatted data file: " & Chr(9) & outFile aZo>3z; End Sub i> {0h3Y un)PW&~E 'Utility function to read the contents of a file into an array of strings. t^~itlE{ Function ReadFile(ByVal fileName As String, _ J@ 8OU ByRef lineArray() As String) As Long R~RE21kAc t\n'Kuk` ReadFile = -1 uME_/S uO Dim oFSO As Object D28>e Set oFSO = CreateObject("Scripting.FileSystemObject") w@a|_? Erase lineArray xb&,9Lxd| $ao7pvU6 Dim fid As Long [-R[rF If oFSO.fileexists( fileName ) Then )6px5Vwz fid = FreeFile() ~/2OK!M Open fileName For Input As fid q'uGB fE. lineArray = Split(Input(LOF(fid), fid), vbCrLf) ! 'Hd:oD< Close fid FY/F}C,o End If &Cr4<V6-q Set oFSO = Nothing yFTN/MFt Return UBound( lineArray ) H9WXp& >g{b'Xx End Function =pnQ?2Og &@D\4b,?nm Sub GetFileList( ByVal in_dir As String, _ )C rsm& ByRef in_flist() As String ) -NA2+]. v:NQrN 'Redimension the file list array dl3}\o_ Erase in_flist 8<=sUO JX#0<U|L 'Tracks how many files are found \\`(x:\ Dim fCount As Long r,P`$- fCount = 0 va0}?fy.O% ?Q"1zcX 'Recurse directory and search for text files 9A9T'g)Du Dim f As String Nc?'}, f = Dir$(in_dir & "*.txt") 1*trtb4F While f <> "" 8T"kQB.Zv ReDim Preserve in_flist(fCount) Bz>5OuOVS\ in_flist(fCount) = f dKa2_|k' fCount += 1 7'|aEH f = Dir$() F]s:`4 Wend x]t$Zb/Uxa ReDim Preserve in_flist(fCount-1) 3kVN[0 ,}wFQ9*|W End Sub kX+98?h-C
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